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annotate packages/hal/synth/arch/current/doc/synth.sgml @ 991:fcb7cbb964ae

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* doc/synth.sgml: Replaced .gif with .png to get PDF output. * doc/*.gif: Delete. * doc/*.png: Replacements for .gifs added.
author jlarmour
date Thu, 01 May 2003 23:15:58 +0000
parents 40890868764a
children 74dbf4c3f2e1
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1 <!-- DOCTYPE part PUBLIC "-//OASIS//DTD DocBook V3.1//EN" -->
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2
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3 <!-- {{{ Banner -->
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4
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5 <!-- =============================================================== -->
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6 <!-- -->
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7 <!-- synth.sgml -->
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8 <!-- -->
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9 <!-- Synthetic target architectural documentation. -->
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10 <!-- -->
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11 <!-- =============================================================== -->
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12 <!-- ####COPYRIGHTBEGIN#### -->
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13 <!-- -->
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14 <!-- =============================================================== -->
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15 <!-- Copyright (C) 2002 Bart Veer. -->
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16 <!-- Copyright (C) 2002 Red Hat, Inc. -->
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17 <!-- This material may be distributed only subject to the terms -->
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18 <!-- and conditions set forth in the Open Publication License, v1.0 -->
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19 <!-- or later (the latest version is presently available at -->
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20 <!-- http://www.opencontent.org/openpub/) -->
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21 <!-- Distribution of the work or derivative of the work in any -->
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22 <!-- standard (paper) book form is prohibited unless prior -->
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23 <!-- permission obtained from the copyright holder -->
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24 <!-- =============================================================== -->
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25 <!-- -->
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26 <!-- ####COPYRIGHTEND#### -->
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27 <!-- =============================================================== -->
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28 <!-- =============================================================== -->
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29 <!-- #####DESCRIPTIONBEGIN#### -->
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30 <!-- -->
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31 <!-- Author(s): bartv -->
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32 <!-- Contact(s): bartv -->
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33 <!-- Date: 2002/02/24 -->
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34 <!-- Version: 0.01 -->
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35 <!-- -->
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36 <!-- ####DESCRIPTIONEND#### -->
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37 <!-- =============================================================== -->
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38
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39 <!-- }}} -->
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40
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41 <part id="hal-synth-arch"><title>eCos Synthetic Target</title>
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42
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43 <!-- {{{ Overview -->
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44
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45 <refentry id="synth">
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46 <refmeta>
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47 <refentrytitle>Overview</refentrytitle>
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48 </refmeta>
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49 <refnamediv>
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50 <refname>The eCos synthetic target</refname>
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51 <refpurpose>Overview</refpurpose>
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52 </refnamediv>
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53
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54 <refsect1 id="synth-description"><title>Description</title>
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55 <para>
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56 Usually eCos runs on either a custom piece of hardware, specially
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57 designed to meet the needs of a specific application, or on a
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58 development board of some sort that is available before the final
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59 hardware. Such boards have a number of things in common:
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60 </para>
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61 <orderedlist>
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62 <listitem><para>
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63 Obviously there has to be at least one processor to do the work. Often
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64 this will be a 32-bit processor, but it can be smaller or larger.
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65 Processor speed will vary widely, depending on the expected needs of
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66 the application. However the exact processor being used tends not to
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67 matter very much for most of the development process: the use of
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68 languages such as C or C++ means that the compiler will handle those
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69 details.
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70 </para></listitem>
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71 <listitem><para>
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72 There needs to be memory for code and for data. A typical system will
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73 have two different types of memory. There will be some non-volatile
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74 memory such as flash, EPROM or masked ROM. There will also be some
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75 volatile memory such as DRAM or SRAM. Often the code for the final
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76 application will reside in the non-volatile memory and all of the RAM
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77 will be available for data. However updating non-volatile memory
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78 requires a non-trivial amount of effort, so for much of the
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79 development process it is more convenient to burn suitable firmware,
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80 for example RedBoot, into the non-volatile memory and then use that to
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81 load the application being debugged into RAM, alongside the
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82 application data and a small area reserved for use by the firmware.
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83 </para></listitem>
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84 <listitem><para>
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85 The platform must provide certain mimimal I/O facilities. Most eCos
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86 configurations require a clock signal of some sort. There must also be
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87 some way of outputting diagnostics to the user, often but not always
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88 via a serial port. Unless special debug hardware is being used, source
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89 level debugging will require bidirectional communication between a
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90 host machine and the target hardware, usually via a serial port or an
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91 ethernet device.
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92 </para></listitem>
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93 <listitem><para>
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94 All the above is not actually very useful yet because there is no way
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95 for the embedded device to interact with the rest of the world, except
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96 by generating diagnostics. Therefore an embedded device will have
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97 additional I/O hardware. This may be fairly standard hardware such as
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98 an ethernet or USB interface, or special hardware designed
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99 specifically for the intended application, or quite often some
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100 combination. Standard hardware such as ethernet or USB may be
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101 supported by eCos device drivers and protocol stacks, whereas the
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102 special hardware will be driven directly by application code.
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103 </para></listitem>
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104 </orderedlist>
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105 <para>
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106 Much of the above can be emulated on a typical PC running Linux.
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107 Instead of running the embedded application being developed on a
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108 target board of some sort, it can be run as a Linux process. The
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109 processor will be the PC's own processor, for example an x86, and the
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110 memory will be the process' address space. Some I/O facilities can be
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111 emulated directly through system calls. For example clock hardware can
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112 be emulated by setting up a <literal>SIGALRM</literal> signal, which
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113 will cause the process to be interrupted at regular intervals. This
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114 emulation of real hardware will not be particularly accurate, the
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115 number of cpu cycles available to the eCos application between clock
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116 ticks will vary widely depending on what else is running on the PC,
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117 but for much development work it will be good enough.
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118 </para>
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119 <para>
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120 Other I/O facilities are provided through an I/O auxiliary process,
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121 ecosynth, that gets spawned by the eCos application during startup.
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122 When an eCos device driver wants to perform some I/O operation, for
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123 example send out an ethernet packet, it sends a request to the I/O
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124 auxiliary. That is an ordinary Linux application so it has ready
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125 access to all normal Linux I/O facilities. To emulate a device
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126 interrupt the I/O auxiliary can raise a <literal>SIGIO</literal>
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127 signal within the eCos application. The HAL's interrupt subsystem
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128 installs a signal handler for this, which will then invoke the
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129 standard eCos ISR/DSR mechanisms. The I/O auxiliary is based around
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130 Tcl scripting, making it easy to extend and customize. It should be
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131 possible to configure the synthetic target so that its I/O
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132 functionality is similar to what will be available on the final target
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133 hardware for the application being developed.
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134 </para>
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135 <informalfigure PgWide=1>
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136 <mediaobject>
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137 <imageobject>
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138 <imagedata fileref="synth-io-overview.png" Scalefit=1 Align="Center">
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139 </imageobject>
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140 </mediaobject>
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141 </informalfigure>
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142 <para>
208
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143 A key requirement for synthetic target code is that the embedded
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144 application must not be linked with any of the standard Linux
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145 libraries such as the GNU C library: that would lead to a confusing
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146 situation where both eCos and the Linux libraries attempted to provide
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147 functions such as <function>printf</function>. Instead the synthetic
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148 target support must be implemented directly on top of the Linux
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149 kernels' system call interface. For example, the kernel provides a
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150 system call for write operations. The actual function
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151 <function>write</function> is implemented in the system's C library,
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152 but all it does is move its arguments on to the stack or into certain
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153 registers and then execute a special trap instruction such as
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154 <literal>int&nbsp;0x80</literal>. When this instruction is executed
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155 control transfers into the kernel, which will validate the arguments
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156 and perform the appropriate operation. Now, a synthetic target
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157 application cannot be linked with the system's C library. Instead it
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158 contains a function <function>cyg_hal_sys_write</function> which, like
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159 the C library's <function>write</function> function, pushes its
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160 arguments on to the stack and executes the trap instruction. The Linux
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161 kernel cannot tell the difference, so it will perform the I/O
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162 operation requested by the synthetic target. With appropriate
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163 knowledge of what system calls are available, this makes it possible
332
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164 to emulate the required I/O facilities. For example, spawning the
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165 ecosynth I/O auxiliary involves system calls
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166 <function>cyg_hal_sys_fork</function> and
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167 <function>cyg_hal_sys_execve</function>, and sending a request to the
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168 auxiliary uses <function>cyg_hal_sys_write</function>.
208
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169 </para>
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170 <para>
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171 In many ways developing for the synthetic target is no different from
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172 developing for real embedded targets. eCos must be configured
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173 appropriately: selecting a suitable target such as
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174 <userinput>i386linux</userinput> will cause the configuration system
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175 to load the appropriate packages for this hardware; this includes an
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176 architectural HAL package and a platform-specific package; the
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177 architectural package contains generic code applicable to all Linux
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178 platforms, whereas the platform package is for specific Linux
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179 implementations such as the x86 version and contains any
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180 processor-specific code. Selecting this target will also bring in some
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181 device driver packages. Other aspects of the configuration such as
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182 which API's are supported are determined by the template, by adding
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183 and removing packages, and by fine-grained configuration.
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184 </para>
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185 <para>
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186 In other ways developing for the synthetic target can be much easier
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187 than developing for a real embedded target. For example there is no
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188 need to worry about building and installing suitable firmware on the
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189 target hardware, and then downloading and debugging the actual
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190 application over a serial line or a similar connection. Instead an
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191 eCos application built for the synthetic target is mostly
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192 indistinguishable from an ordinary Linux program. It can be run simply
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193 by typing the name of the executable file at a shell prompt.
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194 Alternatively you can debug the application using whichever version of
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195 gdb is provided by your Linux distribution. There is no need to build
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196 or install special toolchains. Essentially using the synthetic target
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197 means that the various problems associated with real embedded hardware
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198 can be bypassed for much of the development process.
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199 </para>
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200 <para>
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201 The eCos synthetic target provides emulation, not simulation. It is
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202 possible to run eCos in suitable architectural simulators but that
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203 involves a rather different approach to software development. For
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204 example, when running eCos on the psim PowerPC simulator you need
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205 appropriate cross-compilation tools that allow you to build PowerPC
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206 executables. These are then loaded into the simulator which interprets
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207 every instruction and attempts to simulate what would happen if the
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208 application were running on real hardware. This involves a lot of
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209 processing overhead, but depending on the functionality provided by
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210 the simulator it can give very accurate results. When developing for
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211 the synthetic target the executable is compiled for the PC's own
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212 processor and will be executed at full speed, with no need for a
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213 simulator or special tools. This will be much faster and somewhat
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214 simpler than using an architectural simulator, but no attempt is made
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215 to accurately match the behaviour of a real embedded target.
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216 </para>
332
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217 </refsect1>
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218 </refentry>
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219
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220 <!-- }}} -->
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221 <!-- {{{ Installation -->
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222
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223 <refentry id="synth-install">
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224 <refmeta>
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225 <refentrytitle>Installation</refentrytitle>
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226 </refmeta>
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227 <refnamediv>
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228 <refname>Installation</refname>
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229 <refpurpose>Preparing to use the synthetic target</refpurpose>
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230 </refnamediv>
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231
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232 <refsect1 id="synth-install-host"><title>Host-side Software</title>
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233 <para>
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234 To get the full functionality of the synthetic target, users must
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235 build and install the I/O auxiliary ecosynth and various support
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236 files. It is possible to develop applications for the synthetic target
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237 without the auxiliary, but only limited I/O facilities will be
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238 available. The relevant code resides in the <filename
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239 class="directory">host</filename> subdirectory of the synthetic target
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240 architectural HAL package, and building it involves the standard
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241 <command>configure</command>, <command>make</command>, and
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242 <command>make install</command> steps.
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243 </para>
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244 <para>
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245 There are two main ways of building the host-side software. It is
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246 possible to build both the generic host-side software and all
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247 package-specific host-side software, including the I/O auxiliary. in a
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248 single build tree. This involves using the
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249 <command>configure</command> script at the toplevel of the eCos
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250 repository, which will automatically search the <filename
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251 class="directory">packages</filename> hierarchy for host-side
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252 software. For more information on this, see the
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253 <filename>README.host</filename> file at the top of the repository.
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254 Note that if you have an existing build tree which does not include
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255 the synthetic target architectural HAL package then it will be
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256 necessary to rerun the toplevel configure script: the search for
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257 appropriate packages happens at configure time.
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258 </para>
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259 <para>
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260 The alternative is to build just the host-side for this package.
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261 This involves creating a suitable build directory and running the
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262 <command>configure</command> script. Note that building directly in
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263 the source tree is not allowed.
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264 </para>
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265 <screen>
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266 $ cd &lt;somewhere suitable&gt;
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267 $ mkdir synth_build
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268 $ cd synth_build
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269 $ &lt;repo&lt;&gt;/packages/hal/synth/arch/&lt;version&gt;/host/configure &lt;options&gt;
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270 $ make
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271 $ make install
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272 </screen>
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273 <para>
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274 The code makes extensive use of Tcl/TK and requires version 8.3 or
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275 later. This is checked by the <command>configure</command> script. By
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276 default it will use the system's Tcl installation in <filename
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277 class="directory">/usr</filename>. If a different, more recent Tcl
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278 installation should be used then its location can be specified using
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279 the options <option>--with-tcl=&lt;path&gt;</option>,
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280 <option>--with-tcl-header=&lt;path&gt;</option> and
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281 <option>--with-tcl-lib=&lt;path&gt;</option>. For more information on these options
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282 see the <filename>README.host</filename> file at the toplevel of the
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283 eCos repository.
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284 </para>
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285 <para>
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286 Some users may also want to specify the install location using a
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287 <option>--prefix=&lt;path&gt;</option> option. The default install
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288 location is <filename class="directory">/usr/local</filename>. It is
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289 essential that the <filename class="directory">bin</filename>
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290 subdirectory of the install location is on the user's search
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291 <envar>PATH</envar>, otherwise the eCos application will be unable to
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292 locate and execute the I/O auxiliary ecosynth.
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293 </para>
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294 <para>
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295 Because ecosynth is run automatically by an eCos application rather
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296 than explicitly by the user, it is not installed in the <filename
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297 class="directory">bin</filename> subdirectory itself. Instead it is
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298 installed below <filename class="directory">libexec</filename>,
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299 together with various support files such as images. At configure time
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300 it is usually possible to specify an alternative location for
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301 <filename class="directory">libexec</filename> using
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302 <option>--exec-prefix=&lt;path&gt;</option> or
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303 <option>--libexecdir=&lt;path&gt;</option>. These options should not
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304 be used for this package because the eCos application is built
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305 completely separately and does not know how the host-side was
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306 configured.
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307 </para>
208
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308 </refsect1>
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309
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310 <refsect1 id="synth-tools"><title>Toolchain</title>
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311 <para>
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312 When developing eCos applications for a normal embedded target it is
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313 necessary to use a suitable cross-compiler and related tools such as
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314 the linker. Developing for the synthetic target is easier because you
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315 can just use the standard GNU tools (gcc, g++, ld, &hellip;) which
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316 were provided with your Linux distribution, or which you used to build
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317 your own Linux setup. Any reasonably recent version of the tools, for
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318 example gcc 2.96(Red Hat) as shipped with Red Hat Linux 7, should be
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319 sufficient.
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320 </para>
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321 <para>
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322 There is one important limitation when using these tools: current gdb
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323 will not support debugging of eCos threads on the synthetic target. As
332
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324 far as gdb is concerned a synthetic target application is
208
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325 indistinguishable from a normal Linux application, so it assumes that
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326 any threads will be created by calls to the Linux
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327 <function>pthread_create</function> function provided by the C
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328 library. Obviously this is not the case since the application is never
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329 linked with that library. Therefore gdb never notices the eCos thread
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330 mechanisms and assumes the application is single-threaded. Fixing this
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331 is possible but would involve non-trivial changes to gdb.
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332 </para>
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333 <para>
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334 Theoretically it is possible to develop synthetic target applications
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335 on, for example, a PC running Windows and then run the resulting
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336 executables on another machine that runs Linux. This is rarely useful:
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337 if a Linux machine is available then usually that machine will also be
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338 used for building ecos and the application. However, if for some
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339 reason it is necessary or desirable to build on another machine then
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340 this requires a suitable cross-compiler and related tools. If the
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341 application will be running on a typical PC with an x86 processor then
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342 a suitable configure triplet would be
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343 <userinput>i686-pc-linux-gnu</userinput>. The installation
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344 instructions for the various GNU tools should be consulted for further
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345 information.
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346 </para>
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347 </refsect1>
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348
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349 <refsect1 id="synth-hardware"><title>Hardware Preparation</title>
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350 <para>
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351 Preparing a real embedded target for eCos development can be tricky.
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352 Often the first step is to install suitable firmware, usually RedBoot.
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353 This means creating and building a special configuration for eCos with
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354 the RedBoot template, then somehow updating the target's flash chips
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355 with the resulting RedBoot image. Typically it will also be necessary
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356 to get a working serial connection, and possibly set up ethernet as
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357 well. Although usually none of the individual steps are particularly
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358 complicated, there are plenty of ways in which things can go wrong and
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359 it can be hard to figure out what is actually happening. Of course
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360 some board manufacturers make life easier for their developers by
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361 shipping hardware with RedBoot preinstalled, but even then it is still
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362 necessary to set up communication between host and target.
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363 </para>
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364 <para>
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365 None of this is applicable to the synthetic target. Instead you can
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366 just build a normal eCos configuration, link your application with the
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367 resulting libraries, and you end up with an executable that you can
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368 run directly on your Linux machine or via gdb. A useful side effect of
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369 this is that application development can start before any real
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370 embedded hardware is actually available.
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371 </para>
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372 <para>
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373 Typically the memory map for a synthetic target application will be
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374 set up such that there is a read-only ROM region containing all the
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375 code and constant data, and a read-write RAM region for the data. The
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376 default locations and sizes of these regions depend on the specific
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377 platform being used for development. Note that the application always
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378 executes out of ROM: on a real embedded target much of the development
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379 would involve running RedBoot firmware there, with application code
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380 and data loaded into RAM; usually this would change for the final
332
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381 system; the firmware would be replaced by the eCos application itself,
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382 configured for ROM bootstrap, and it would perform the appropriate
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383 hardware initialization. Therefore the synthetic target actually
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384 emulates the behaviour of a final system, not of a development
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385 environment. In practice this is rarely significant, although having
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386 the code in read-only memory can help catch some problems in
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387 application code.
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388 </para>
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389 </refsect1>
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390
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391 </refentry>
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392
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393 <!-- }}} -->
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394 <!-- {{{ Running the application -->
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395
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396 <refentry id="synth-running">
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397 <refmeta>
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398 <refentrytitle>Running a Synthetic Target Application</refentrytitle>
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399 </refmeta>
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400 <refnamediv>
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401 <refname>Execution</refname>
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402 <refpurpose>Arguments and configuration files</refpurpose>
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403 </refnamediv>
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404
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405 <refsect1 id="synth-running-description"><title>Description</title>
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406 <para>
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407 The procedure for configuring and building eCos and an application for
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408 the synthetic target is the same as for any other eCos target. Once an
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409 executable has been built it can be run like any Linux program, for
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410 example from a shell prompt,
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411 </para>
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412 <screen>
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413 $ ecos_hello &lt;options&gt;
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414 </screen>
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415 <para>
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416 or using gdb:
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417 </para>
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418 <screen>
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419 $ gdb --nw --quiet --args ecos_hello &lt;options&gt;
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420 (gdb) run
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421 Starting program: ecos_hello &lt;options&gt;
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422 </screen>
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423 <para>
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424 By default use of the I/O auxiliary is disabled. If its I/O facilities
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425 are required then the option <option>--io</option> must be used.
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426 </para>
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427 <note><para>
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428 In future the default behaviour may change, with the I/O auxiliary
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429 being started by default. The option <option>--nio</option> can be
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430 used to prevent the auxiliary from being run.
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431 </para></note>
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432 </refsect1>
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433
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434 <refsect1 id="synth-running-arguments"><title>Command-line Arguments</title>
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435 <para>
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436 The syntax for running a synthetic target application is:
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437 </para>
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438 <screen>
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439 $ &lt;ecos_app&gt; [options] [-- [app_options]]
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440 </screen>
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441 <para>
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442 Command line options up to the <option>--</option> are passed on to
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443 the I/O auxiliary. Subsequent arguments are not passed on to the
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444 auxiliary, and hence can be used by the eCos application itself. The
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445 full set of arguments can be accessed through the variables
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446 <varname>cyg_hal_sys_argc</varname> and
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447 <varname>cyg_hal_sys_argv</varname>.
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448 </para>
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449 <para>
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450 The following options are accepted as standard:
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451 </para>
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452 <variablelist>
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453 <varlistentry>
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454 <term><option>--io</option></term>
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455 <listitem><para>
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456 This option causes the eCos application to spawn the I/O auxiliary
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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457 during HAL initialization. Without this option only limited I/O will
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
458 be available.
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459 </para></listitem>
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460 </varlistentry>
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461 <varlistentry>
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462 <term><option>--nio</option></term>
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463 <listitem><para>
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464 This option prevents the eCos application from spawning the I/O
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465 auxiliary. In the current version of the software this is the default.
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466 </para></listitem>
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467 </varlistentry>
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468 <varlistentry>
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469 <term><option>-nw</option>, <option>--no-windows</option></term>
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470 <listitem><para>
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471 The I/O auxiliary can either provide a graphical user interface, or it
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472 can run in a text-only mode. The default is to provide the graphical
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473 interface, but this can be disabled with <option>-nw</option>.
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474 Emulation of some devices, for example buttons connected to digital
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475 inputs, requires the graphical interface.
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476 </para></listitem>
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477 </varlistentry>
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478 <varlistentry>
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479 <term><option>-w</option>, <option>--windows</option></term>
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480 <listitem><para>
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481 The <option>-w</option> causes the I/O auxiliary to provide a
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482 graphical user interface. This is the default.
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483 </para></listitem>
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484 </varlistentry>
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485 <varlistentry>
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486 <term><option>-v</option>, <option>--version</option></term>
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487 <listitem><para>
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488 The <option>-v</option> option can be used to determine the version of
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489 the I/O auxiliary being used and where it has been installed. Both the
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diff changeset
490 auxiliary and the eCos application will exit immediately.
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491 </para></listitem>
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492 </varlistentry>
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493 <varlistentry>
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494 <term><option>-h</option>, <option>--help</option></term>
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495 <listitem><para>
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496 <option>-h</option> causes the I/O auxiliary to list all accepted
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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497 command-line arguments. This happens after all devices have been
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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498 initialized, since the host-side support for some of the devices may
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499 extend the list of recognised options. After this both the auxiliary
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500 and the eCos application will exit immediately. This option implies
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501 <option>-nw</option>.
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502 </para></listitem>
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503 </varlistentry>
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504 <varlistentry>
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505 <term><option>-k</option>, <option>--keep-going</option></term>
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506 <listitem><para>
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diff changeset
507 If an error occurs in the I/O auxiliary while reading in any of the
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diff changeset
508 configuration files or initializing devices, by default both the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
509 auxiliary and the eCos application will exit. The <option>-k</option>
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diff changeset
510 option can be used to make the auxiliary continue in spite of errors,
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511 although obviously it may not be fully functional.
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512 </para></listitem>
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513 </varlistentry>
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514 <varlistentry>
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515 <term><option>-nr</option>, <option>--no-rc</option></term>
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516 <listitem><para>
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517 Normally the auxiliary processes two <link
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518 linkend="synth-running-user-config">user configuration files</link>
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519 during startup: <filename>initrc.tcl</filename> and
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520 <filename>mainrc.tcl</filename>. This can be suppressed using the
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521 <option>-nr</option> option.
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522 </para></listitem>
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523 </varlistentry>
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524 <varlistentry>
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525 <term><option>-x</option>, <option>--exit</option></term>
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526 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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527 When providing a graphical user interface the I/O auxiliary will
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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528 normally continue running even after the eCos application has exited.
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529 This allows the user to take actions such as saving the current
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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530 contents of the main text window. If run with <option>-x</option> then
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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531 the auxiliary will exit as soon the application exits.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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532 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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533 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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534 <varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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535 <term><option>-nx</option>, <option>--no-exit</option></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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536 <listitem><para>
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537 When the graphical user interface is disabled with
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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538 <option>-nw</option> the I/O auxiliary will normally exit immediately
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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539 when the eCos application exits. Without the graphical frontend there
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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540 is usually no way for the user to interact directly with the
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541 auxiliary, so there is no point in continuing to run once the eCos
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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542 application will no longer request any I/O operations. Specifying the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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543 <option>-nx</option> option causes the auxiliary to continue running
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544 even after the application has exited.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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545 </para></listitem>
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546 </varlistentry>
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547 <varlistentry>
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548 <term><option>-V</option>, <option>--verbose</option></term>
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549 <listitem><para>
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550 This option causes the I/O auxiliary to output some additional
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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551 information, especially during initialization.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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552 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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553 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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554 <varlistentry>
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555 <term><option>-l &lt;file&gt;</option>, <option>--logfile &lt;file&gt;</option></term>
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556 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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557 Much of the output of the eCos application and the I/O auxiliary is
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558 simple text, for example resulting from eCos
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
559 <function>printf</function> or <function>diag_printf</function> calls.
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560 When running in graphical mode this output goes to a central text
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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561 window, and can be saved to a file or edited via menus. The
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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562 <option>-l</option> can be used to automatically generate an
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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563 additional logfile containing all the text. If graphical
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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564 mode is disabled then by default all the text just goes to the current
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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565 standard output. Specifying <option>-l</option> causes most of the
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566 text to go into a logfile instead, although some messages such as
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567 errors generated by the auxiliary itself will still go to stdout as
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568 well.
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569 </para></listitem>
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570 </varlistentry>
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571 <varlistentry>
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572 <term><option>-t &lt;file&gt;</option>, <option>--target &lt;file&gt;</option></term>
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573 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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574 During initialization the I/O auxiliary reads in a target definition
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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575 file. This file holds information such as which Linux devices should
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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576 be used to emulate the various eCos devices. The <option>-t</option>
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577 option can be used to specify which target definition should be used
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578 for the current run, defaulting to <filename>default.tdf</filename>.
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579 It is not necessary to include the <filename>.tdf</filename> suffix,
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580 this will be appended automatically if necessary.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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581 </para></listitem>
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582 </varlistentry>
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583 <varlistentry>
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584 <term><option>-geometry &lt;geometry&gt;</option></term>
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585 <listitem><para>
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586 This option can be used to control the size and position of the main
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587 window, as per X conventions.
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588 </para></listitem>
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589 </varlistentry>
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590 </variablelist>
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591 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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592 The I/O auxiliary loads support for the various devices dynamically
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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593 and some devices may accept additional command line arguments. Details
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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594 of these can be obtained using the <option>-h</option> option or by
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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595 consulting the device-specific documentation. If an unrecognised
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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596 command line argument is used then a warning will be issued.
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597 </para>
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598 </refsect1>
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599
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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600 <refsect1 id="synth-running-tdf"><title>The Target Definition File</title>
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601 <para>
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602 The eCos application will want to access devices such as
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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603 <varname>eth0</varname> or <varname>/dev/ser0</varname>. These need to
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604 be mapped on to Linux devices. For example some users may all traffic
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605 on the eCos <varname>/dev/ser0</varname> serial device to go via the
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606 Linux serial device <varname>/dev/ttyS1</varname>, while ethernet I/O
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607 for the eCos <varname>eth0</varname> device should be mapped to the
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608 Linux ethertap device <varname>tap3</varname>. Some devices may need
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609 additional configuration information, for example to limit the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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610 number of packets that should be buffered within the I/O auxiliary.
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611 The target definition file provides all this information.
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612 </para>
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613 <para>
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614 By default the I/O auxiliary will look for a file
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615 <filename>default.tdf</filename>. An alternative target definition can
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diff changeset
616 be specified on the command line using <option>-t</option>, for
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diff changeset
617 example:
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618 </para>
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619 <screen>
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620 $ bridge_app --io -t twineth
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621 </screen>
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622 <para>
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623 A <filename>.tdf</filename> suffix will be appended automatically if
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624 necessary. If a relative pathname is used then the I/O auxiliary will
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625 search for the target definition file in the current directory, then
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626 in <filename class="directory">~/.ecos/synth/</filename>, and finally
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627 in its install location.
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628 </para>
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629 <para>
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diff changeset
630 A typical target definition file might look like this:
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631 </para>
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632 <programlisting>
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633 synth_device console {
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634 # appearance -foreground white -background black
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635 filter trace {^TRACE:.*} -foreground HotPink1 -hide 1
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636 }
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637
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638 synth_device ethernet {
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639 eth0 real eth1
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640 eth1 ethertap tap4 00:01:02:03:FE:06
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641
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642 ## Maximum number of packets that should be buffered per interface.
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643 ## Default 16
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644 #max_buffer 32
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645
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646 ## Filters for the various recognised protocols.
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647 ## By default all filters are visible and use standard colours.
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648 filter ether -hide 0
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649 #filter arp -hide 1
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650 #filter ipv4 -hide 1
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651 #filter ipv6 -hide 1
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652 }
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653 </programlisting>
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654 <para>
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655 A target definition file is actually a Tcl script that gets run in the
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656 main interpreter of the I/O auxiliary during initialization. This
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657 provides a lot of flexibility if necessary. For example the script
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658 could open a socket to a resource management server of some sort to
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659 determine which hardware facilities are already in use and adapt
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660 accordingly. Another possibility is to adapt based on <link
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661 linkend="synth-new-host-args">command line arguments</link>. Users who
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662 are not familiar with Tcl programming should still be able to edit a
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663 simple target definition file without too much difficulty, using a
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diff changeset
664 mixture of cut'n'paste, commenting or uncommenting various lines, and
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665 making small edits such as changing <literal>tap4</literal> to
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666 <literal>eth2</literal>.
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667 </para>
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668 <para>
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669 Each type of device will have its own entry in the target definition
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670 file, taking the form:
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671 </para>
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672 <programlisting>
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673 synth_device &lt;device type&gt; {
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674 &lt;options&gt;
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675 }
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676 </programlisting>
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677 <para>
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diff changeset
678 The documentaton for each synthetic target device should provide
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679 details of the options available for that device, and often a suitable
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diff changeset
680 fragment that can be pasted into a target definition file and edited.
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diff changeset
681 There is no specific set of options that a given device will always
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682 provide. However in practice many devices will use common code
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diff changeset
683 exported by the main I/O auxiliary, or their implementation will
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diff changeset
684 involve some re-use of code for an existing device. Hence certain
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685 types of option are common to many devices.
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686 </para>
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687 <para>
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688 A good example of this is filters, which control the appearance of
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689 text output. The above target definition file defines a filter
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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690 <varname>trace</varname> for output from the eCos application. The
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diff changeset
691 regular expression will match output from the infrastructure package's
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
692 tracing facilities when <varname>CYGDBG_USE_TRACING</varname> and
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693 <varname>CYGDBG_INFRA_DEBUG_TRACE_ASSERT_SIMPLE</varname> are enabled.
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694 With the current settings this output will not be visible by default,
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diff changeset
695 but can be made visible using the menu item <guimenuitem>System
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diff changeset
696 Filters</guimenuitem>. If made visible the trace output will appear in
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
697 an unusual colour, so users can easily distinguish the trace output
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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698 from other text. All filters accept the following options:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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699 </para>
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700 <variablelist>
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701 <varlistentry>
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702 <term><option>-hide [0|1]</option></term>
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703 <listitem><para>
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704 This controls whether or not text matching this filter should be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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705 invisible by default or not. At run-time the visibility of each filter
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
706 can be controlled using the <guimenuitem>System Filters</guimenuitem>
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707 menu item.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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708 </para></listitem>
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709 </varlistentry>
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710 <varlistentry>
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711 <term><option>-foreground &lt;colour&gt;</option></term>
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diff changeset
712 <listitem><para>
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diff changeset
713 This specifies the foreground colour for all text matching this
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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714 filter. The colour can be specified using an RGB value such as
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715 <literal>#F08010</literal>, or a symbolic name such as
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716 <literal>"light steel blue"</literal>. The X11 utility
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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717 <application>showrgb</application> can be used to find out
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718 about the available colours.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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719 </para></listitem>
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720 </varlistentry>
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721 <varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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722 <term><option>-background &lt;colour&gt;</option></term>
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723 <listitem><para>
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724 This specifies the background colour for all text matching the filter.
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725 As with <option>-foreground</option> the colour can be specified using
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726 a symbolic name or an RGB value.
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727 </para></listitem>
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728 </varlistentry>
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729 </variablelist>
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730 <para>
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diff changeset
731 Some devices may create their own subwindows, for example to monitor
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diff changeset
732 ethernet traffic or to provide additional I/O facilities such as
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733 emulated LED's or buttons. Usually the target definition file can be
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734 used to control the <link linkend="synth-gui-layout">layout</link> of
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735 these windows.
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736 </para>
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737 <para>
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diff changeset
738 The I/O auxiliary will not normally warn about
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diff changeset
739 <command>synth_device</command> entries in the target definition file
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740 for devices that are not actually needed by the current eCos
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741 application. This makes it easier to use a single file for several
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diff changeset
742 different applications. However it can lead to confusion if an entry
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diff changeset
743 is spelled incorrectly and hence does not actually get used. The
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
744 <option>-V</option> command line option can be used to get warnings
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745 about unused device entries in the target definition file.
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746 </para>
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747 <para>
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748 If the body of a <command>synth_device</command> command contains an
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diff changeset
749 unrecognised option and the relevant device is in use, the I/O
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750 auxiliary will always issue a warning about such options.
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751 </para>
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752 </refsect1>
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753
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754 <refsect1 id="synth-running-user-config"><title>User Configuration Files</title>
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755 <para>
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756 During initialization the I/O auxiliary will execute two user
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757 configuration files, <filename>initrc.tcl</filename> and
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758 <filename>mainrc.tcl</filename>. It will look for these files in the
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759 directory <filename class="directory">~/.ecos/synth/</filename>. If
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760 that directory does not yet exist it will be created and populated
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761 with initial dummy files.
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762 </para>
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763 <para>
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diff changeset
764 Both of these configuration files are Tcl scripts and will be run in
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diff changeset
765 the main interpreter used by the I/O auxiliary itself. This means that
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diff changeset
766 they have full access to the internals of the auxiliary including the
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767 various Tk widgets, and they can perform file or socket I/O if
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768 desired. The section <xref linkend="synth-new-host"> contains
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769 information about the facilities available on the host-side for
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770 writing new device drivers, and these can also be used in the
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771 initialization scripts.
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772 </para>
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773 <para>
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774 The <filename>initrc.tcl</filename> script is run before the auxiliary
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775 has processed any requests from the eCos application, and hence before
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776 any devices have been instantiated. At this point the generic
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777 command-line arguments has been processed, the target definition file
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778 has been read in, and the hooks functionality has been initialized. If
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779 running in graphical mode the main window will have been created, but
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780 has been withdrawn from the screen to allow new widgets to be added
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781 without annoying screen flicker. A typical
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782 <filename>initrc.tcl</filename> script could add some menu or toolbar
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783 options, or install a hook function that will be run when the
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diff changeset
784 eCos application exits.
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diff changeset
785 </para>
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diff changeset
786 <para>
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diff changeset
787 The <filename>mainrc.tcl</filename> script is run after eCos has
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diff changeset
788 performed all its device initialization and after C++ static
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diff changeset
789 constructors have run, and just before the call to
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790 <function>cyg_start</function> which will end up transferring control
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791 to the application itself. A typical <filename>mainrc.tcl</filename>
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792 script could look at what interrupt vectors have been allocated to
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793 which devices and create a little monitor window that shows interrupt
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794 activity.
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diff changeset
795 </para>
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796 </refsect1>
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797
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798 <refsect1 id="synth-running-session"><title>Session Information</title>
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799 <para>
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800 When running in graphical mode, the I/O auxiliary will read in a file
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801 <filename>~/.ecos/synth/guisession</filename> containing session
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802 information. This file should not normally be edited manually, instead
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803 it gets updated automatically when the auxiliary exits. The purpose of
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804 this file is to hold configuration options that are manipulated via
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805 the graphical interface, for example which browser should be used to
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806 display online help.
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807 </para>
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808 <warning><para>
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809 GUI session functionality is not yet available in the current release.
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810 When that functionality is fully implemented it is possible that some
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811 target definition file options may be removed, to be replaced by
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812 graphical editing via a suitable preferences dialog, with the
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813 current settings saved in the session file.
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814 </para></warning>
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815 </refsect1>
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816
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817 </refentry>
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818
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819 <!-- }}} -->
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820 <!-- {{{ ecosynth user interface -->
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821
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822 <refentry id="synth-gui">
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823 <refmeta>
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824 <refentrytitle>The I/O Auxiliary's User Interface</refentrytitle>
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825 </refmeta>
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826 <refnamediv>
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827 <refname>User Interface</refname>
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828 <refpurpose>Controlling the I/O Auxiliary</refpurpose>
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829 </refnamediv>
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830
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831 <refsect1 id="synth-gui-description"><title>Description</title>
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832 <para>
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833 The synthetic target auxiliary is designed to support both extensions
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834 and user customization. Support for the desired devices is dynamically
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835 loaded, and each device can extend the user interface. For example it
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836 is possible for a device to add menu options, place new buttons on the
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837 toolbar, create its own sub-window within the overall layout, or even
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838 create entire new toplevel windows. These subwindows or toplevels
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839 could show graphs of activity such as interrupts or packets being
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840 transferred. They could also allow users to interact with the eCos
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841 application, for example by showing a number of buttons which will be
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842 mapped on to digital inputs in the eCos application. Different
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843 applications will have their own I/O requirements, changing the
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diff changeset
844 host-side support files that get loaded and that may modify the user
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diff changeset
845 interface. The I/O auxiliary also reads in user configuration scripts
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846 which can enhance the interface in the same way. Therefore the exact
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diff changeset
847 user interface will depend on the user and on the eCos application
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diff changeset
848 being run. However the overall layout is likely to remain the same.
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849 </para>
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850 <informalfigure PgWide=1>
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851 <mediaobject>
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852 <imageobject>
991
fcb7cbb964ae * doc/synth.sgml: Replaced .gif with .png to get PDF
jlarmour
parents: 709
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853 <imagedata fileref="screen_main.png" Scalefit=1 Align="Center">
332
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854 </imageobject>
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diff changeset
855 </mediaobject>
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856 </informalfigure>
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857 <para>
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858 The title bar identifies the window as belonging to an eCos synthetic
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859 target application and lists both the application name and its process
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860 id. The latter is especially useful if the application was started
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861 directly from a shell prompt and the user now wants to attach a gdb
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862 session. The window has a conventional menu bar with the usual
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863 entries, plus a toolbar with buttons for common operations such as cut
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864 and paste. Balloon help is supported.
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diff changeset
865 </para>
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866 <para>
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867 There is a central <link linkend="synth-gui-text">text window</link>,
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868 possibly surrounded by various sub-windows for various devices. For
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diff changeset
869 example there could be a row of emulated LED's above the text window,
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870 and monitors of ethernet traffic and interrupt activity on the right.
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871 At the bottom of the window is a status line, including a small
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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872 animation that shows whether or not the eCos application is still
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873 running.
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874 </para>
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875 </refsect1>
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876
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877 <refsect1 id="synth-gui-menus"><title>Menus and the Toolbar</title>
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878 <para>
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879 Usually there will be four menus on the menu bar:
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880 <guimenu>File</guimenu>, <guimenu>Edit</guimenu>,
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881 <guimenu>View</guimenu> and <guimenu>Help</guimenu>.
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882 </para>
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883 <informalfigure PgWide=1>
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884 <mediaobject>
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885 <imageobject>
991
fcb7cbb964ae * doc/synth.sgml: Replaced .gif with .png to get PDF
jlarmour
parents: 709
diff changeset
886 <imagedata fileref="menu_file.png" Scalefit=1 Align="Center">
332
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887 </imageobject>
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888 </mediaobject>
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889 </informalfigure>
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890 <para>
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891 On the <guimenu>File</guimenu> menu there are three entries related to
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892 saving the current contents of the central text window.
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893 <guimenuitem>Save</guimenuitem> is used to save the currently visible
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894 contents of the text window. Any text that is hidden because of
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diff changeset
895 filters will not be written to the savefile. If there has been a
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896 previous <guimenuitem>Save</guimenuitem> or <guimenuitem>Save
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diff changeset
897 As</guimenuitem> operation then the existing savefile will be re-used,
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898 otherwise the user will be asked to select a suitable file.
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diff changeset
899 <guimenuitem>Save As</guimenuitem> also saves just the currently
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900 visible contents but will always prompt the user for a filename.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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901 <guimenuitem>Save All</guimenuitem> can be used to save the full
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diff changeset
902 contents of the text window, including any text that is currently
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903 hidden. It will always prompt for a new filename, to avoid confusion
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diff changeset
904 with partial savefiles.
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diff changeset
905 </para>
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906 <para>
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diff changeset
907 Usually the eCos application will be run from inside gdb or from a
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908 shell prompt. Killing off the application while it is being debugged
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diff changeset
909 in a gdb session is not a good idea, it would be better to use gdb's
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910 own <command>kill</command> command. Alternatively the eCos
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diff changeset
911 application itself can use the <function>CYG_TEST_EXIT</function> or
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diff changeset
912 <filename>cyg_hal_sys_exit</filename> functionality. However it is
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diff changeset
913 possible to terminate the application from the I/O auxiliary using
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diff changeset
914 <guimenuitem>Kill eCos</guimenuitem>. A clean shutdown will be
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diff changeset
915 attempted, but that can fail if the application is currently halted
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diff changeset
916 inside gdb or if it has crashed completely. As a last resort
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diff changeset
917 <constant>SIGKILL</constant> will be used.
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diff changeset
918 </para>
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diff changeset
919 <para>
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diff changeset
920 When operating in graphical mode the I/O auxiliary will normally
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
921 continue to run even after the eCos application has exited. This
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
922 allows the user to examine the last few lines of output, and perhaps
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diff changeset
923 perform actions such as saving the output to a file. The
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diff changeset
924 <guimenuitem>Exit</guimenuitem> menu item can be used to shut down the
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diff changeset
925 auxiliary. Note that this behaviour can be changed with command line
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diff changeset
926 arguments <link
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diff changeset
927 linkend="synth-running-arguments"><option>--exit</option></link> and
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diff changeset
928 <link
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929 linkend="synth-running-arguments"><option>--no-exit</option></link>.
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930 </para>
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931 <para>
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diff changeset
932 If <guimenuitem>Exit</guimenuitem> is used while the eCos application
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diff changeset
933 is still running then the I/O auxiliary will first attempt to
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934 terminate the application cleanly, and then exit.
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diff changeset
935 </para>
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936 <informalfigure PgWide=1>
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937 <mediaobject>
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938 <imageobject>
991
fcb7cbb964ae * doc/synth.sgml: Replaced .gif with .png to get PDF
jlarmour
parents: 709
diff changeset
939 <imagedata fileref="menu_edit.png" Scalefit=1 Align="Center">
332
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diff changeset
940 </imageobject>
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941 </mediaobject>
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diff changeset
942 </informalfigure>
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diff changeset
943 <para>
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diff changeset
944 The <guimenu>Edit</guimenu> menu contains the usual entries for
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
945 text manipulation: <guimenuitem>Cut</guimenuitem>,
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diff changeset
946 <guimenuitem>Copy</guimenuitem>, <guimenuitem>Paste</guimenuitem>,
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diff changeset
947 <guimenuitem>Clear</guimenuitem> and <guimenuitem>Select
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diff changeset
948 All</guimenuitem>. These all operate on the central text window. By
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diff changeset
949 default this window cannot be edited so the cut, paste and clear
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parents: 210
diff changeset
950 operations are disabled. If the user wants to edit the contents of the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
951 text window then the <guimenuitem>Read Only</guimenuitem> checkbutton
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diff changeset
952 should be toggled.
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diff changeset
953 </para>
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parents: 210
diff changeset
954 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
955 The <guimenuitem>Preferences</guimenuitem> menu item brings up a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
956 miscellaneous preferences dialog. One of the preferences relates to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
957 online help: the I/O auxiliary does not currently have a built-in html
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
958 viewer; instead it will execute an external browser of some sort. With
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
959 the example settings shown, the I/O auxiliary will first attempt to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
960 interact with an existing mozilla session. If that fails it will try
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
961 to run a new mozilla instance, or as a last result use the Gnome help
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
962 viewer.
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parents: 210
diff changeset
963 </para>
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parents: 210
diff changeset
964 <informalfigure PgWide=1>
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diff changeset
965 <mediaobject>
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966 <imageobject>
991
fcb7cbb964ae * doc/synth.sgml: Replaced .gif with .png to get PDF
jlarmour
parents: 709
diff changeset
967 <imagedata fileref="preferences.png" Scalefit=1 Align="Center">
332
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diff changeset
968 </imageobject>
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parents: 210
diff changeset
969 </mediaobject>
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diff changeset
970 </informalfigure>
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parents: 210
diff changeset
971 <para>
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diff changeset
972 The <guimenu>View</guimenu> menu contains the <guimenuitem>System
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parents: 210
diff changeset
973 Filters</guimenuitem> entry, used to edit the settings for the current
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parents: 210
diff changeset
974 <link linkend="synth-gui-text">filters</link>.
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parents: 210
diff changeset
975 </para>
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diff changeset
976 <informalfigure PgWide=1>
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diff changeset
977 <mediaobject>
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diff changeset
978 <imageobject>
991
fcb7cbb964ae * doc/synth.sgml: Replaced .gif with .png to get PDF
jlarmour
parents: 709
diff changeset
979 <imagedata fileref="menu_view.png" Scalefit=1 Align="Center">
332
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980 </imageobject>
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parents: 210
diff changeset
981 </mediaobject>
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parents: 210
diff changeset
982 </informalfigure>
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parents: 210
diff changeset
983 <para>
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parents: 210
diff changeset
984 The <guimenu>Help</guimenu> menu can be used to activate online help
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
985 for eCos generally, for the synthetic target as a whole, and for
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
986 specific devices supported by the generic target. The Preferences
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
987 dialog can be used to select the browser that will be used.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
988 </para>
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parents: 210
diff changeset
989 <informalfigure PgWide=1>
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parents: 210
diff changeset
990 <mediaobject>
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parents: 210
diff changeset
991 <imageobject>
991
fcb7cbb964ae * doc/synth.sgml: Replaced .gif with .png to get PDF
jlarmour
parents: 709
diff changeset
992 <imagedata fileref="menu_help.png" Scalefit=1 Align="Center">
332
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diff changeset
993 </imageobject>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
994 </mediaobject>
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parents: 210
diff changeset
995 </informalfigure>
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parents: 210
diff changeset
996 <note><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
997 At the time of writing there is no well-defined toplevel index file
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
998 for all eCos documentation. Hence the relevant menu item is disabled.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
999 Documentation for the synthetic target and the supported devices
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1000 is stored as part of the package itself so can usually be found fairly
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1001 easily. It may be necessary to set the <envar>ECOS_REPOSITORY</envar>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1002 environment variable.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1003 </para></note>
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diff changeset
1004
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1005 </refsect1>
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diff changeset
1006
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1007 <refsect1 id="synth-gui-text"><title>The Main Text Window</title>
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diff changeset
1008 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1009 The central text window holds the console output from the eCos
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1010 application: the screen shot above shows DHCP initialization data from
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1011 the TCP/IP stack, and some output from the <function>main</function>
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parents: 210
diff changeset
1012 thread at the bottom. Some devices can insert text of their own, for
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1013 example the ethernet device support can be configured to show details
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1014 of incoming and outgoing packets. Mixing the output from the eCos
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1015 application and the various devices can make it easier to understand
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1016 the order in which events occur.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1017 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1018 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1019 The appearance of text from different sources can be controlled by
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1020 means of filters, and it is also possible to hide some of the text.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1021 For example, if tracing is enabled in the eCos configuration then the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1022 trace output can be given its own colour scheme, making it stand out
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1023 from the rest of the output. In addition the trace output is generally
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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1024 voluminous so it can be hidden by default, made visible only to find
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1025 out more about what was happening when a particular problem occurred.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1026 Similarly the ethernet device support can output details of the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1027 various packets being transferred, and using a different background
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1028 colour for this output again makes it easier to distinguish from
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1029 console output.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1030 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1031 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1032 The default appearance for most filters is controlled via the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1033 <link linkend="synth-running-tdf">target definition file</link>. An
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1034 example entry might be:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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1035 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1036 <programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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1037 filter trace {^TRACE:.*} -foreground HotPink1 -hide 1
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1038 </programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1039 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1040 The various colours and the hide flag for each filter can be changed
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1041 at run-time, using the <guimenuitem>System Filters</guimenuitem> item
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1042 on the <guimenu>View</guimenu> menu. This will bring up a dialog like
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1043 the following:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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1044 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1045 <informalfigure PgWide=1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1046 <mediaobject>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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1047 <imageobject>
991
fcb7cbb964ae * doc/synth.sgml: Replaced .gif with .png to get PDF
jlarmour
parents: 709
diff changeset
1048 <imagedata fileref="filters.png" Scalefit=1 Align="Center">
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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1049 </imageobject>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1050 </mediaobject>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1051 </informalfigure>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1052 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1053 It should be noted that the text window is line-oriented, not
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1054 character-oriented. If an eCos application sends a partial line of
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1055 text then that will remain buffered until a newline character is
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1056 received, rather than being displayed immediately. This avoids
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1057 confusion when there is concurrent output from several sources.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1058 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1059 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1060 By default the text window is read-only. This means it will not allow
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1061 cut, paste and clear operations, and keyboard input will be ignored.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1062 The <guimenu>Edit</guimenu> menu has a checkbutton <guimenuitem>Read
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1063 Only</guimenuitem> which can be toggled to allow write operations. For
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1064 example, a user could type in a reminder of what was happening at this
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1065 time, or paste in part of a gdb session. Such keyboard input does not
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1066 get forwarded to the eCos application: if the latter requires keyboard
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1067 input then that should happen via a separate keyboard device.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1068 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1069 </refsect1>
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diff changeset
1070
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1071 <refsect1 id="synth-gui-layout"><title>Positioning Optional Windows</title>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1072 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1073 Some devices may create their own subwindows, for example to monitor
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1074 ethernet traffic or to provide additional I/O facilities such as
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1075 emulated LED's or buttons. Usually the target definition file can be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1076 used to control the <link linkend="synth-gui-layout">layout</link> of
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1077 these windows. This requires an understanding of the overall layout of
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1078 the display.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1079 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1080 <informalfigure PgWide=1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1081 <mediaobject>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1082 <imageobject>
991
fcb7cbb964ae * doc/synth.sgml: Replaced .gif with .png to get PDF
jlarmour
parents: 709
diff changeset
1083 <imagedata fileref="layout.png" Scalefit=1 Align="Center">
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1084 </imageobject>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1085 </mediaobject>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1086 </informalfigure>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1087 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1088 Subwindows are generally packed in one of eight frames surrounding the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1089 central text window: <varname>.main.nw</varname>,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1090 <varname>.main.n</varname>, <varname>.main.ne</varname>,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1091 <varname>.main.w</varname>, <varname>.main.e</varname>,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1092 <varname>.main.sw</varname>, <varname>.main.s</varname>, and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1093 <varname>.main.se</varname>. To position a row of LED's above the text
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1094 window and towards the left, a target definition file could contain an
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1095 entry such as:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1096 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1097 <programlisting>
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bartv
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diff changeset
1098 synth_device led {
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1099 pack -in .main.n -side left
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1100 &hellip;
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1101 }
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1102 </programlisting>
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diff changeset
1103 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1104 Similarly, to put a traffic monitor window on the right of the text
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1105 window would involve something like:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1106 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1107 <programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1108 &hellip;
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1109 monitor_pack -in .main.e -side bottom
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1110 &hellip;
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1111 </programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1112 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1113 Often it will be sufficient to specify a container frame and one of
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1114 <constant>left</constant>, <constant>right</constant>,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1115 <constant>top</constant> or <constant>bottom</constant>. Full control
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1116 over the positioning requires an understanding of Tcl/Tk and in
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1117 particular the packing algorithm, and an appropriate reference work
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1118 should be consulted.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1119 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1120 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1121
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1122 <refsect1 id="synth-gui-global-config"><title>Global Settings</title>
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bartv
parents: 210
diff changeset
1123 <note><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1124 This section still to be written - it should document the interaction
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bartv
parents: 210
diff changeset
1125 between X resources and ecosynth, and how users can control settings
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bartv
parents: 210
diff changeset
1126 such as the main foreground and background colours.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1127 </para></note>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1128 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1129
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1130 </refentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1131
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1132 <!-- }}} -->
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1133 <!-- {{{ The console device -->
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1134
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1135 <refentry id="synth-console">
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parents: 210
diff changeset
1136 <refmeta>
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bartv
parents: 210
diff changeset
1137 <refentrytitle>The Console Device</refentrytitle>
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bartv
parents: 210
diff changeset
1138 </refmeta>
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bartv
parents: 210
diff changeset
1139 <refnamediv>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1140 <refname>The console device </refname>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1141 <refpurpose>Show output from the eCos application</refpurpose>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1142 </refnamediv>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1143
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1144 <refsect1 id="synth-console-description"><title>Description</title>
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bartv
parents: 210
diff changeset
1145 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1146 The eCos application can generate text output in a variety of ways,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1147 including calling <function>printf</function> or
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1148 <function>diag_printf</function>. When the I/O auxiliary is enabled
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1149 the eCos startup code will instantiate a console device to process all
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1150 such output. If operating in text mode the output will simply go to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1151 standard output, or to a logfile if the <option>-l</option> command
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1152 line option is specified. If operating in graphical mode the output
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1153 will go to the central text window, and optionally to a logfile as
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1154 well. In addition it is possible to control the appearance of the main
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1155 text via the target definition file, and to install extra filters for
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1156 certain types of text.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1157 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1158 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1159 It should be noted that the console device is line-oriented, not
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1160 character-oriented. This means that outputting partial lines is not
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1161 supported, and some functions such as <function>fflush</function> and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1162 <function>setvbuf</function> will not operate as expected. This
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1163 limitation prevents much possible confusion when using filters to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1164 control the appearance of the text window, and has some performance
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1165 benefits - especially when the eCos application generates a great deal
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1166 of output such as when tracing is enabled. For most applications this
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1167 is not a problem, but it is something that developers should be aware
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1168 of.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1169 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1170 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1171 The console device is output-only, it does not provide any support for
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1172 keyboard input. If the application requires keyboard input then that
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1173 should be handled by a separate eCos device package and matching
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1174 host-side code.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1175 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1176 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1177
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1178 <refsect1 id="synth-console-install"><title>Installation</title>
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bartv
parents: 210
diff changeset
1179 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1180 The eCos side of the console device is implemented by the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1181 architectural HAL itself, in the source file
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1182 <filename>synth_diag.c</filename>, rather than in a separate device
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1183 package. Similarly the host-side implementation,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1184 <function>console.tcl</function>, is part of the architectural HAL's
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1185 host-side support. It gets installed automatically alongside the I/O
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1186 auxiliary itself, so no separate installation procedure is required.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1187 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1188 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1189
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1190 <refsect1 id="synth-console-tdf"><title>Target Definition File</title>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1191 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1192 The <link linkend="synth-running-tdf">target definition file</link>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1193 can contain a number of entries related to the console device. These
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1194 are all optional, they only control the appearance of text output. If
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1195 such control is desired then the relevant options should appear in the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1196 body of a <command>synth_device</command> entry:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1197 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1198 <programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1199 synth_device console {
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1200 &hellip;
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1201 }
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1202 </programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1203 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1204 The first option is <command>appearance</command>, used to control the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1205 appearance of any text generated by the eCos application that does not
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1206 match one of the installed filters. This option takes the same
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1207 argument as any other filter, for example:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1208 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1209 <programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1210 synth_device console {
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1211 appearance -foreground white -background black
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1212 &hellip;
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1213 }
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1214 </programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1215 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1216 Any number of additional filters can be created with a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1217 <command>filter</command> option, for example:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1218 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1219 <programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1220 synth_device console {
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1221 &hellip;
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1222 filter trace {^TRACE:.*} -foreground HotPink1 -hide 1
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1223 &hellip;
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1224 }
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1225 </programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1226 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1227 The first argument gives the new filter a name which will be used in
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1228 the <link linkend="synth-gui-text">filters dialog</link>. Filter names
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1229 should be unique. The second argument is a Tcl regular expression. The
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1230 console support will match each line of eCos output against this
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1231 regular expression, and if a match is found then the filter will be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1232 used for this line of text. The above example matches any line of
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1233 output that begins with <literal>TRACE:</literal>, which corresponds
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1234 to the eCos infrastructure's tracing facilities. The remaining options
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1235 control the desired appearance for matched text. If some eCos output
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1236 matches the regular expressions for several different filters then
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1237 only the first match will be used.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1238 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1239 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1240
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1241 <refsect1 id="synth-console-target-config"><title>Target-side
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bartv
parents: 210
diff changeset
1242 Configuration Options</title>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1243 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1244 There are no target-side configuration options related to the console
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1245 device.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1246 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1247 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1248
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1249 <refsect1 id="synth-console-arguments"><title>Command Line Arguments</title>
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bartv
parents: 210
diff changeset
1250 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1251 The console device does not use any command-line arguments.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1252 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1253 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1254
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1255 <refsect1 id="synth-console-hooks"><title>Hooks</title>
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bartv
parents: 210
diff changeset
1256 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1257 The console device does not provide any hooks.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1258 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1259 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1260
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1261 <refsect1><title>Additional Tcl Procedures</title>
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bartv
parents: 210
diff changeset
1262 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1263 The console device does not provide any additional Tcl procedures that
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1264 can be used by other scripts.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1265 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1266 </refsect1>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1267
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1268 </refentry>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1269
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1270 <!-- }}} -->
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1271 <!-- {{{ System calls -->
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1272
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jlarmour
parents:
diff changeset
1273 <refentry id="synth-syscalls">
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jlarmour
parents:
diff changeset
1274 <refmeta>
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jlarmour
parents:
diff changeset
1275 <refentrytitle>System Calls</refentrytitle>
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jlarmour
parents:
diff changeset
1276 </refmeta>
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jlarmour
parents:
diff changeset
1277
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jlarmour
parents:
diff changeset
1278 <refnamediv>
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parents:
diff changeset
1279 <refname>cyg_hal_sys_xyz</refname>
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jlarmour
parents:
diff changeset
1280 <refpurpose>Access Linux system facilities</refpurpose>
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jlarmour
parents:
diff changeset
1281 </refnamediv>
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jlarmour
parents:
diff changeset
1282
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jlarmour
parents:
diff changeset
1283 <refsynopsisdiv>
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jlarmour
parents:
diff changeset
1284 <funcsynopsis>
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parents:
diff changeset
1285 <funcsynopsisinfo>
709
40890868764a * doc/overview.gif, doc/overview.fig: renamed to
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parents: 332
diff changeset
1286 #include &lt;cyg/hal/hal_io.h&gt;
208
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diff changeset
1287 </funcsynopsisinfo>
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parents:
diff changeset
1288 <funcprototype>
332
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diff changeset
1289 <funcdef>int <function>cyg_hal_sys_xyzzy</function></funcdef>
208
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parents:
diff changeset
1290 <varargs>
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jlarmour
parents:
diff changeset
1291 </funcprototype>
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parents:
diff changeset
1292 </funcsynopsis>
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parents:
diff changeset
1293 </refsynopsisdiv>
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parents:
diff changeset
1294
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parents:
diff changeset
1295 <refsect1 id="synth-syscalls-description"><title>Description</title>
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jlarmour
parents:
diff changeset
1296 <para>
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jlarmour
parents:
diff changeset
1297 On a real embedded target eCos interacts with the hardware by peeking
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jlarmour
parents:
diff changeset
1298 and poking various registers, manipulating special regions of memory,
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jlarmour
parents:
diff changeset
1299 and so on. The synthetic target does not access hardware directly.
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parents:
diff changeset
1300 Instead I/O and other operations are emulated by making appropriate
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jlarmour
parents:
diff changeset
1301 Linux system calls. The HAL package exports a number of functions
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jlarmour
parents:
diff changeset
1302 which allow other packages, or even application code, to make these
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jlarmour
parents:
diff changeset
1303 same system calls. However this facility must be used with care: any
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jlarmour
parents:
diff changeset
1304 code which calls, for example, <function>cyg_hal_sys_write</function>
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jlarmour
parents:
diff changeset
1305 will only ever run on the synthetic target; that functionality is
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jlarmour
parents:
diff changeset
1306 obviously not provided on any real hardware because there is no
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jlarmour
parents:
diff changeset
1307 underlying Linux kernel to implement it.
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jlarmour
parents:
diff changeset
1308 </para>
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parents:
diff changeset
1309 <para>
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jlarmour
parents:
diff changeset
1310 The synthetic target only provides a subset of the available system
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jlarmour
parents:
diff changeset
1311 calls, specifically those calls which have proved useful to implement
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1312 I/O emulation. This subset can be extended fairly easily if necessary.
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jlarmour
parents:
diff changeset
1313 All of the available calls, plus associated data structures and
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jlarmour
parents:
diff changeset
1314 macros, are defined in the header file <filename
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jlarmour
parents:
diff changeset
1315 class="headerfile">cyg/hal/hal_io.h</filename>. There is a simple
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jlarmour
parents:
diff changeset
1316 convention: given a Linux system call such as
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jlarmour
parents:
diff changeset
1317 <function>open</function>, the synthetic target will prefix
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jlarmour
parents:
diff changeset
1318 <literal>cyg_hal_sys</literal> and provide a function with that name.
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jlarmour
parents:
diff changeset
1319 The second argument to the <function>open</function> system call is
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1320 a set of flags such as <constant>O_RDONLY</constant>, and the header
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jlarmour
parents:
diff changeset
1321 file will define a matching constant
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jlarmour
parents:
diff changeset
1322 <constant>CYG_HAL_SYS_O_RDONLY</constant>. There are also data
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jlarmour
parents:
diff changeset
1323 structures such as <structname>cyg_hal_sys_sigset_t</structname>,
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jlarmour
parents:
diff changeset
1324 matching the Linux data structure <structname>sigset_t</structname>.
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jlarmour
parents:
diff changeset
1325 </para>
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jlarmour
parents:
diff changeset
1326 <para>
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jlarmour
parents:
diff changeset
1327 In most cases the functions provided by the synthetic target behave as
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1328 per the documentation for the Linux system calls, and section 2 of the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1329 Linux man pages can be consulted for more information. There is one
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1330 important difference: typically the documentation will say that a
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1331 function returns <literal>-1</literal> to indicate an error, with the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1332 actual error code held in <varname>errno</varname>; the actual
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1333 underlying system call and hence the
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jlarmour
parents:
diff changeset
1334 <function>cyg_hal_sys_xyz</function> provided by eCos instead returns
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jlarmour
parents:
diff changeset
1335 a negative number to indicate an error, with the absolute value of
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1336 that number corresponding to the error code; usually it is the C
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1337 library which handles this and manipulates errno, but of course
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jlarmour
parents:
diff changeset
1338 synthetic target applications are not linked with that Linux library.
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jlarmour
parents:
diff changeset
1339 </para>
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jlarmour
parents:
diff changeset
1340 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1341 However, there are some exceptions. The Linux kernel has evolved over
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jlarmour
parents:
diff changeset
1342 the years, and some of the original system call interfaces are no
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1343 longer appropriate. For example the original
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jlarmour
parents:
diff changeset
1344 <function>select</function> system call has been superseded by
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1345 <function>_newselect</function>, and that is what the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1346 <function>select</function> function in the C library actually uses.
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jlarmour
parents:
diff changeset
1347 The old call is still available to preserve binary compatibility but,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1348 like the C library, eCos makes use of the new one because it provides
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jlarmour
parents:
diff changeset
1349 the appropriate functionality. In an attempt to reduce confusion the
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jlarmour
parents:
diff changeset
1350 eCos function is called <function>cyg_hal_sys__newselect</function>,
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jlarmour
parents:
diff changeset
1351 in other words it matches the official system call naming scheme. The
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1352 authoritive source of information on such matters is the Linux kernel
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jlarmour
parents:
diff changeset
1353 sources themselves, and especially its header files.
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jlarmour
parents:
diff changeset
1354 </para>
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parents:
diff changeset
1355 <para>
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jlarmour
parents:
diff changeset
1356 eCos packages and applications should never
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jlarmour
parents:
diff changeset
1357 <literal>#include</literal> Linux header files directly. For example,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1358 doing a <literal>#include&nbsp;&lt;/usr/include/fcntl.h&gt;</literal>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1359 to access additional macros or structure definitions, or alternatively
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1360 manipulating the header file search path, will lead to problems
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1361 because the Linux header files are likely to duplicate and clash with
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1362 definitions in the eCos headers. Instead the appropriate functionality
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1363 should be extracted from the Linux headers and moved into either
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1364 <filename class="headerfile">cyg/hal/hal_io.h</filename> or into
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1365 application code, with suitable renaming to avoid clashes with eCos
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1366 names. Users should be aware that large-scale copying may involve
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1367 licensing complications.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1368 </para>
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jlarmour
parents:
diff changeset
1369 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1370 Adding more system calls is usually straightforward and involves
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1371 adding one or more lines to the platform-specific file in the
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jlarmour
parents:
diff changeset
1372 appropriate platform HAL, for example
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1373 <filename>syscall-i386-linux-1.0.S</filename>. However it is necessary
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jlarmour
parents:
diff changeset
1374 to do some research first about the exact interface implemented by the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1375 system call, because of issues such as old system calls that have been
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1376 superseded. The required information can usually be found fairly
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1377 easily by searching through the Linux kernel sources and possibly the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1378 GNU C library sources.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
1379 </para>
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jlarmour
parents:
diff changeset
1380 </refsect1>
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jlarmour
parents:
diff changeset
1381 </refentry>
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jlarmour
parents:
diff changeset
1382
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diff changeset
1383 <!-- }}} -->
332
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diff changeset
1384 <!-- {{{ New devices - target-side -->
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diff changeset
1385
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diff changeset
1386 <refentry id="synth-new-target">
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diff changeset
1387 <refmeta>
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diff changeset
1388 <refentrytitle>Writing New Devices - target</refentrytitle>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
1389 </refmeta>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
1390 <refnamediv>
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diff changeset
1391 <refname>Writing New Devices</refname>
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bartv
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diff changeset
1392 <refpurpose>extending the synthetic target, target-side</refpurpose>
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bartv
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diff changeset
1393 </refnamediv>
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bartv
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diff changeset
1394
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bartv
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diff changeset
1395 <refsynopsisdiv>
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bartv
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diff changeset
1396 <funcsynopsis>
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bartv
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diff changeset
1397 <funcsynopsisinfo>
709
40890868764a * doc/overview.gif, doc/overview.fig: renamed to
jlarmour
parents: 332
diff changeset
1398 #include &lt;cyg/hal/hal_io.h&gt;
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1399 </funcsynopsisinfo>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1400
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
1401 <funcprototype>
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bartv
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diff changeset
1402 <funcdef>int <function>synth_auxiliary_instantiate</function></funcdef>
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1403 <paramdef>const char* <parameter>package</parameter></paramdef>
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diff changeset
1404 <paramdef>const char* <parameter>version</parameter></paramdef>
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diff changeset
1405 <paramdef>const char* <parameter>device</parameter></paramdef>
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diff changeset
1406 <paramdef>const char* <parameter>instance</parameter></paramdef>
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1407 <paramdef>const char* <parameter>data</parameter></paramdef>
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1408 </funcprototype>
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bartv
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diff changeset
1409 <funcprototype>
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bartv
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diff changeset
1410 <funcdef>void <function>synth_auxiliary_xchgmsg</function></funcdef>
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bartv
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diff changeset
1411 <paramdef>int <parameter>device_id</parameter></paramdef>
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diff changeset
1412 <paramdef>int <parameter>request</parameter></paramdef>
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diff changeset
1413 <paramdef>int <parameter>arg1</parameter></paramdef>
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diff changeset
1414 <paramdef>int <parameter>arg2</parameter></paramdef>
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diff changeset
1415 <paramdef>const unsigned char* <parameter>txdata</parameter></paramdef>
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diff changeset
1416 <paramdef>int <parameter>txlen</parameter></paramdef>
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diff changeset
1417 <paramdef>int* <parameter>reply</parameter></paramdef>
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diff changeset
1418 <paramdef>unsigned char* <parameter>rxdata</parameter></paramdef>
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diff changeset
1419 <paramdef>int* <parameter>rxlen</parameter></paramdef>
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diff changeset
1420 <paramdef>int <parameter>max_rxlen</parameter></paramdef>
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diff changeset
1421 </funcprototype>
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diff changeset
1422 </funcsynopsis>
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diff changeset
1423 </refsynopsisdiv>
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1424
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diff changeset
1425 <refsect1 id="synth-new-target-description"><title>Description</title>
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diff changeset
1426 <para>
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diff changeset
1427 In some ways writing a device driver for the synthetic target is very
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diff changeset
1428 similar to writing one for a real target. Obviously it has to provide
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diff changeset
1429 the standard interface for that class of device, so for example an
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diff changeset
1430 ethernet device has to provide <function>can_send</function>,
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diff changeset
1431 <function>send</function>, <function>recv</function> and similar
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diff changeset
1432 functions. Many devices will involve interrupts, so the driver
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diff changeset
1433 contains ISR and DSR functions and will call
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diff changeset
1434 <function>cyg_drv_interrupt_create</function>,
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diff changeset
1435 <function>cyg_drv_interrupt_acknowledge</function>, and related
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diff changeset
1436 functions.
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diff changeset
1437 </para>
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diff changeset
1438 <para>
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diff changeset
1439 In other ways writing a device driver for the synthetic target is very
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diff changeset
1440 different. Usually the driver will not have any direct access to the
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diff changeset
1441 underlying hardware. In fact for some devices the I/O may not involve
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diff changeset
1442 real hardware, instead everything is emulated by widgets on the
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diff changeset
1443 graphical display. Therefore the driver cannot just peek and poke
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diff changeset
1444 device registers, instead it must interact with host-side code by
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diff changeset
1445 exchanging message. The synthetic target HAL provides a function
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diff changeset
1446 <function>synth_auxiliary_xchgmsg</function> for this purpose.
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diff changeset
1447 </para>
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diff changeset
1448 <para>
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diff changeset
1449 Initialization of a synthetic target device driver is also very
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diff changeset
1450 different. On real targets the device hardware already exists when the
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diff changeset
1451 driver's initialization routine runs. On the synthetic target it is
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diff changeset
1452 first necessary to instantiate the device inside the I/O auxiliary, by
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diff changeset
1453 a call to <function>synth_auxiliary_instantiate</function>. That
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diff changeset
1454 function performs a special message exchange with the I/O auxiliary,
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diff changeset
1455 causing it to load a Tcl script for the desired type of device and run
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diff changeset
1456 an instantiation procedure within that script.
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diff changeset
1457 </para>
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diff changeset
1458 <para>
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diff changeset
1459 Use of the I/O auxiliary is optional: if the user does not specify
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diff changeset
1460 <option>--io</option> on the command line then the auxiliary will not
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diff changeset
1461 be started and hence most I/O operations will not be possible. Device
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diff changeset
1462 drivers should allow for this possibility, for example by just
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diff changeset
1463 discarding any data that gets written. The HAL exports a flag
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diff changeset
1464 <varname>synth_auxiliary_running</varname> which should be checked.
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parents: 210
diff changeset
1465 </para>
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diff changeset
1466 </refsect1>
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diff changeset
1467
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diff changeset
1468 <refsect1 id="synth-new-target-instantiate"><title>Instantiating a Device</title>
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parents: 210
diff changeset
1469 <para>
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diff changeset
1470 Device instantiation should happen during the C++ prioritized static
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parents: 210
diff changeset
1471 constructor phase of system initialization, before control switches to
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parents: 210
diff changeset
1472 <function>cyg_user_start</function> and general application code. This
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diff changeset
1473 ensures that there is a clearly defined point at which the I/O
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diff changeset
1474 auxiliary knows that all required devices have been loaded. It can
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diff changeset
1475 then perform various consistency checks and clean-ups, run the user's
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diff changeset
1476 <filename>mainrc.tcl</filename> script, and make the main window
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diff changeset
1477 visible.
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diff changeset
1478 </para>
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parents: 210
diff changeset
1479 <para>
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diff changeset
1480 For standard devices generic eCos I/O code will call the device
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parents: 210
diff changeset
1481 initialization routines at the right time, iterating through the
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parents: 210
diff changeset
1482 <varname>DEVTAB</varname> table in a static constructor. The same
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parents: 210
diff changeset
1483 holds for network devices and file systems. For more custom devices
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parents: 210
diff changeset
1484 code like the following can be used:
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parents: 210
diff changeset
1485 </para>
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parents: 210
diff changeset
1486 <programlisting>
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1487 #include &lt;cyg/infra/cyg_type.h&gt;
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parents: 210
diff changeset
1488 class mydev_init {
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parents: 210
diff changeset
1489 public:
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parents: 210
diff changeset
1490 mydev_init() {
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parents: 210
diff changeset
1491 &hellip;
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parents: 210
diff changeset
1492 }
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1493 };
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diff changeset
1494 static mydev_init mydev_init_object CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_IO);
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diff changeset
1495 </programlisting>
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diff changeset
1496 <para>
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parents: 210
diff changeset
1497 Some care has to be taken because the object
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parents: 210
diff changeset
1498 <varname>mydev_init_object</varname> will typically not be referenced
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parents: 210
diff changeset
1499 by other code, and hence may get eliminated at link-time. If the code
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parents: 210
diff changeset
1500 is part of an eCos package then problems can be avoided by putting the
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diff changeset
1501 relevant file in <filename>libextras.a</filename>:
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parents: 210
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1502 </para>
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parents: 210
diff changeset
1503 <programlisting>
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1504 cdl_package CYGPKG_DEVS_MINE {
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1505 &hellip;
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1506 compile -library=libextras.a init.cxx
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parents: 210
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1507 }
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1508 </programlisting>
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1509 <para>
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diff changeset
1510 For devices inside application code the same can be achieved by
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diff changeset
1511 linking the relevant module as a <filename>.o</filename> file rather
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parents: 210
diff changeset
1512 than putting it in a <filename>.a</filename> library.
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diff changeset
1513 </para>
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parents: 210
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1514 <para>
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diff changeset
1515 In the device initialization routine the main operation is a call to
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diff changeset
1516 <function>synth_auxiliary_instantiate</function>. This takes five
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parents: 210
diff changeset
1517 arguments, all of which should be strings:
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1518 </para>
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1519 <variablelist>
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1520 <varlistentry>
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1521 <term><varname>package</varname></term>
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1522 <listitem><para>
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parents: 210
diff changeset
1523 For device drivers which are eCos packages this should be a directory
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1524 path relative to the eCos repository, for example
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diff changeset
1525 <literal>devs/eth/synth/ecosynth</literal>. This will allow the I/O
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diff changeset
1526 auxiliary to find the various host-side support files for this package
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parents: 210
diff changeset
1527 within the install tree. If the device is application-specific and not
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parents: 210
diff changeset
1528 part of an eCos package then a NULL pointer can be used, causing the
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diff changeset
1529 I/O auxiliary to search for the support files in the current directory
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parents: 210
diff changeset
1530 and then in <filename class="directory">~/.ecos/synth</filename>
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parents: 210
diff changeset
1531 instead.
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1532 </para></listitem>
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1533 </varlistentry>
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1534 <varlistentry>
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1535 <term><varname>version</varname></term>
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diff changeset
1536 <listitem><para>
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diff changeset
1537 For eCos packages this argument should be the version of the package
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parents: 210
diff changeset
1538 that is being used, for example <literal>current</literal>. A simple
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diff changeset
1539 way to get this version is to use the
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parents: 210
diff changeset
1540 <function>SYNTH_MAKESTRING</function> macro on the package name.
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parents: 210
diff changeset
1541 If the device is application-specific then a NULL pointer should be
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diff changeset
1542 used.
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1543 </para></listitem>
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diff changeset
1544 </varlistentry>
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diff changeset
1545 <varlistentry>
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1546 <term><varname>device</varname></term>
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diff changeset
1547 <listitem><para>
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diff changeset
1548 This argument specifies the type of device being instantiated, for
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diff changeset
1549 example <literal>ethernet</literal>. More specifically the I/O
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parents: 210
diff changeset
1550 auxiliary will append a <filename>.tcl</filename> suffix, giving
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parents: 210
diff changeset
1551 the name of a Tcl script that will handle all I/O requests for the
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parents: 210
diff changeset
1552 device. If the application requires several instances of a type
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parents: 210
diff changeset
1553 of device then the script will only be loaded once, but the script
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parents: 210
diff changeset
1554 will contain an instantiation procedure that will be called for each
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diff changeset
1555 device instance.
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diff changeset
1556 </para></listitem>
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1557 </varlistentry>
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diff changeset
1558 <varlistentry>
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1559 <term><varname>instance</varname></term>
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diff changeset
1560 <listitem><para>
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diff changeset
1561 If it is possible to have multiple instances of a device then this
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diff changeset
1562 argument identifies the particular instance, for example
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diff changeset
1563 <literal>eth0</literal> or <literal>eth1</literal>. Otherwise a NULL
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diff changeset
1564 pointer can be used.
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1565 </para></listitem>
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1566 </varlistentry>
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diff changeset
1567 <varlistentry>
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1568 <term><varname>data</varname></term>
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diff changeset
1569 <listitem><para>
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diff changeset
1570 This argument can be used to pass additional initialization data from
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diff changeset
1571 eCos to the host-side support. This is useful for devices where eCos
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diff changeset
1572 configury must control certain aspects of the device, rather than
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diff changeset
1573 host-side configury such as the target definition file, because eCos
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parents: 210
diff changeset
1574 has compile-time dependencies on some or all of the relevant options.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1575 An example might be an emulated frame buffer where eCos has been
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1576 statically configured for a particular screen size, orientation and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1577 depth. There is no fixed format for this string, it will be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1578 interpreted only by the device-specific host-side Tcl script. However
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1579 the string length should be limited to a couple of hundred bytes to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1580 avoid possible buffer overflow problems.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1581 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1582 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1583 </variablelist>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1584 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1585 Typical usage would look like:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1586 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1587 <programlisting>
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bartv
parents: 210
diff changeset
1588 if (!synth_auxiliary_running) {
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1589 return;
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1590 }
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1591 id = synth_auxiliary_instantiate("devs/eth/synth/ecosynth",
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1592 SYNTH_MAKESTRING(CYGPKG_DEVS_ETH_ECOSYNTH),
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1593 "ethernet",
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1594 "eth0",
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1595 (const char*) 0);
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1596 </programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1597 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1598 The return value will be a device identifier which can be used for
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1599 subsequent calls to <function>synth_auxiliary_xchgmsg</function>. If
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1600 the device could not be instantiated then <literal>-1</literal> will
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1601 be returned. It is the responsibility of the host-side software to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1602 issue suitable diagnostics explaining what went wrong, so normally the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1603 target-side code should fail silently.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1604 </para>
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bartv
parents: 210
diff changeset
1605 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1606 Once the desired device has been instantiated, often it will be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1607 necessary to do some additional initialization by a message exchange.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1608 For example an ethernet device might need information from the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1609 host-side about the MAC address, the <link
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1610 linkend="synth-new-target-interrupts">interrupt vector</link>, and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1611 whether or not multicasting is supported.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1612 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1613 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1614
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1615 <refsect1 id="synth-new-target-xchgmsg"><title>Communicating with a Device</title>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1616 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1617 Once a device has been instantiated it is possible to perform I/O by
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1618 sending messages to the appropriate Tcl script running inside the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1619 auxiliary, and optionally getting back replies. I/O operations are
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1620 always initiated by the eCos target-side, it is not possible for the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1621 host-side software to initiate data transfers. However the host-side
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1622 can raise interrupts, and the interrupt handler inside the target can
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1623 then exchange one or more messages with the host.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1624 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1625 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1626 There is a single function to perform I/O operations,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1627 <function>synth_auxiliary_xchgmsg</function>. This takes the following
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1628 arguments:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1629 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1630 <variablelist>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1631 <varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1632 <term><varname>device_id</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1633 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1634 This should be one of the identifiers returned by a previous
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1635 call to <function>synth_auxiliary_instantiate</function>, specifying the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1636 particular device which should perform some I/O.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1637 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1638 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1639 <varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1640 <term><varname>request</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1641 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1642 Request are just signed 32-bit integers that identify the particular
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1643 I/O operation being requested. There is no fixed set of codes, instead
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1644 each type of device can define its own.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1645 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1646 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1647 <varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1648 <term><varname>arg1</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1649 <term><varname>arg2</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1650 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1651 For some requests it is convenient to pass one or two additional
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1652 parameters alongside the request code. For example an ethernet device
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1653 could define a multicast-all request, with <varname>arg1</varname>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1654 controlling whether this mode should be enabled or disabled. Both
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1655 <varname>arg1</varname> and <varname>arg2</varname> should be signed
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1656 32-bit integers, and their values are interpreted only by the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1657 device-specific Tcl script.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1658 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1659 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1660 <varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1661 <term><varname>txdata</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1662 <term><varname>txlen</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1663 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1664 Some I/O operations may involve sending additional data, for example
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1665 an ethernet packet. Alternatively a control operation may require many
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1666 more parameters than can easily be encoded in <varname>arg1</varname>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1667 and <varname>arg2</varname>, so those parameters have to be placed in
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1668 a suitable buffer and extracted at the other end.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1669 <varname>txdata</varname> is an arbitrary buffer of
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1670 <varname>txlen</varname> bytes that should be sent to the host-side.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1671 There is no specific upper bound on the number of bytes that can be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1672 sent, but usually it is a good idea to allocate the transmit buffer
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1673 statically and keep transfers down to at most several kilobytes.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1674 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1675 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1676 <varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1677 <term><varname>reply</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1678 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1679 If the host-side is expected to send a reply message then
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1680 <varname>reply</varname> should be a pointer to an integer variable
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1681 and will be updated with a reply code, a simple 32-bit integer. The
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1682 synthetic target HAL code assumes that the host-side and target-side
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1683 agree on the protocol being used: if the host-side will not send a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1684 reply to this message then the <varname>reply</varname> argument
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1685 should be a NULL pointer; otherwise the host-side must always send
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1686 a reply code and the <varname>reply</varname> argument must be valid.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1687 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1688 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1689 <varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1690 <term><varname>rxdata</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1691 <term><varname>rxlen</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1692 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1693 Some operations may involve additional data coming from the host-side,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1694 for example an incoming ethernet packet. <varname>rxdata</varname>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1695 should be a suitably-sized buffer, and <varname>rxlen</varname> a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1696 pointer to an integer variable that will end up containing the number
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1697 of bytes that were actually received. These arguments will only be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1698 used if the host-side is expected to send a reply and hence the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1699 <varname>reply</varname> argument was not NULL.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1700 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1701 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1702 <varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1703 <term><varname>max_rxlen</varname></term>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1704 <listitem><para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1705 If a reply to this message is expected and that reply may involve
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1706 additional data, <varname>max_rxlen</varname> limits the size of that
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1707 reply. In other words, it corresponds to the size of the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1708 <varname>rxdata</varname> buffer.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1709 </para></listitem>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1710 </varlistentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1711 </variablelist>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1712 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1713 Most I/O operations involve only some of the arguments. For example
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1714 transmitting an ethernet packet would use the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1715 <varname>request</varname>, <varname>txdata</varname> and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1716 <varname>txlen</varname> fields (in addition to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1717 <varname>device_id</varname> which is always required), but would not
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1718 involve <varname>arg1</varname> or <varname>arg2</varname> and no
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1719 reply would be expected. Receiving an ethernet packet would involve
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1720 <varname>request</varname>, <varname>rxdata</varname>,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1721 <varname>rxlen</varname> and <varname>max_rxlen</varname>; in addition
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1722 <varname>reply</varname> is needed to get any reply from the host-side
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1723 at all, and could be used to indicate whether or not any more packets
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1724 are buffered up. A control operation such as enabling multicast mode
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1725 would involve <varname>request</varname> and <varname>arg1</varname>,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1726 but none of the remaining arguments.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1727 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1728 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1729
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1730 <refsect1 id="synth-new-target-interrupts"><title>Interrupt Handling</title>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1731 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1732 Interrupt handling in the synthetic target is much the same as on a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1733 real target. An interrupt object is created using
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
1734 <function>cyg_drv_interrupt_create</function>, attached, and unmasked.
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1735 The emulated device - in other words the Tcl script running inside the
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1736 I/O auxiliary - can raise an interrupt. Subject to interrupts being
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diff changeset
1737 disabled and the appropriate vector being masked, the system will
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diff changeset
1738 invoke the specified ISR function. The synthetic target HAL
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1739 implementation does have some limitations: there is no support for
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1740 nested interrupts, interrupt priorities, or a separate interrupt
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diff changeset
1741 stack. Supporting those might be appropriate when targetting a
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diff changeset
1742 simulator that attempts to model real hardware accurately, but not for
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diff changeset
1743 the simple emulation provided by the synthetic target.
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1744 </para>
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1745 <para>
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diff changeset
1746 Of course the actual implementation of the ISR and DSR functions will
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diff changeset
1747 be rather different for a synthetic target device driver. For real
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diff changeset
1748 hardware the device driver will interact with the device by reading
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diff changeset
1749 and writing device registers, managing DMA engines, and the like. A
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diff changeset
1750 synthetic target driver will instead call
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diff changeset
1751 <function>synth_auxiliary_xchgmsg</function> to perform the I/O
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1752 operations.
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diff changeset
1753 </para>
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diff changeset
1754 <para>
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diff changeset
1755 There is one other significant difference between interrupt handling
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1756 on the synthetic target and on real hardware. Usually the eCos code
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1757 will know which interrupt vectors are used for which devices. That
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1758 information is fixed when the target hardware is designed. With the
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diff changeset
1759 synthetic target interrupt vectors are assigned to devices on the host
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diff changeset
1760 side, either via the target definition file or dynamically when the
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1761 device is instantiated. Therefore the initialization code for a
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1762 target-side device driver will need to request interrupt vector
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1763 information from the host-side, via a message exchange. Such interrupt
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1764 vectors will be in the range 1 to 31 inclusive, with interrupt 0 being
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diff changeset
1765 reserved for the real-time clock.
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1766 </para>
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1767 </refsect1>
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1768
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1769 </refentry>
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diff changeset
1770
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diff changeset
1771 <!-- }}} -->
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1772 <!-- {{{ New devices - host-side -->
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1773
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1774 <refentry id="synth-new-host">
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1775 <refmeta>
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1776 <refentrytitle>Writing New Devices - host</refentrytitle>
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1777 </refmeta>
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diff changeset
1778 <refnamediv>
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1779 <refname>Writing New Devices</refname>
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diff changeset
1780 <refpurpose>extending the synthetic target, host-side</refpurpose>
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diff changeset
1781 </refnamediv>
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1782
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1783 <refsect1 id="synth-new-host-description"><title>Description</title>
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1784 <para>
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1785 On the host-side adding a new device means writing a Tcl/Tk script
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diff changeset
1786 that will handle instantiation and subsequent requests from the
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1787 target-side. These scripts all run in the same full interpreter,
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diff changeset
1788 extended with various commands provided by the main I/O auxiliary
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1789 code, and running in an overall GUI framework. Some knowledge of
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1790 programming with Tcl/Tk is required to implement host-side device
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1791 support.
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1792 </para>
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1793 <para>
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1794 Some devices can be implemented entirely using a Tcl/Tk script. For
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diff changeset
1795 example, if the final system will have some buttons then those can be
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diff changeset
1796 emulated in the synthetic target using a few Tk widgets. A simple
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diff changeset
1797 emulation could just have the right number of buttons in a row. A more
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diff changeset
1798 advanced emulation could organize the buttons with the right layout,
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diff changeset
1799 perhaps even matching the colour scheme, the shapes, and the relative
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1800 sizes. With other devices it may be necessary for the Tcl script to
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1801 interact with an external program, because the required functionality
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1802 cannot easily be accessed from a Tcl script. For example interacting
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1803 with a raw ethernet device involves some <function>ioctl</function>
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1804 calls, which is easier to do in a C program. Therefore the
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1805 <filename>ethernet.tcl</filename> script which implements the
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1806 host-side ethernet support spawns a separate program
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diff changeset
1807 <filename>rawether</filename>, written in C, that performs the
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diff changeset
1808 low-level I/O. Raw ethernet access usually also requires root
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diff changeset
1809 privileges, and running a small program <filename>rawether</filename>
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diff changeset
1810 with such privileges is somewhat less of a security risk than the
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diff changeset
1811 whole eCos application, the I/O auxiliary, and various dynamically
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1812 loaded Tcl scripts.
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1813 </para>
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1814 <para>
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1815 Because all scripts run in a single interpreter, some care has
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1816 to be taken to avoid accidental sharing of global variables. The best
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1817 way to avoid problems is to have each script create its own Tcl
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1818 namespace, so for example the <filename>ethernet.tcl</filename> script
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1819 creates a namespace <varname>ethernet::</varname> and all variables
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1820 and procedures reside in this namespace. Similarly the I/O auxiliary
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1821 itself makes use of a <varname>synth::</varname> namespace.
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1822 </para>
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1823 </refsect1>
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1824
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1825 <refsect1 id="synth-new-host-build"><title>Building and Installation</title>
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1826 <para>
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1827 When an eCos device driver or application code instantiates a device,
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1828 the I/O auxiliary will attempt to load a matching Tcl script. The
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1829 third argument to <function>synth_auxiliary_instantiate</function>
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1830 specifies the type of device, for example <literal>ethernet</literal>,
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1831 and the I/O auxiliary will append a <filename>.tcl</filename> suffix
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1832 and look for a script <filename>ethernet.tcl</filename>.
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1833 </para>
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1834 <para>
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1835 If the device being instantiated is application-specific rather than
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1836 part of an eCos package, the I/O auxiliary will look first in the
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1837 current directory, then in <filename
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1838 class="directory">~/.ecos/synth</filename>. If it is part of an eCos
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1839 package then the auxiliary will expect to find the Tcl script and any
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diff changeset
1840 support files below <filename
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1841 class="directory">libexec/ecos</filename> in the install tree - note
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1842 that the same install tree must be used for the I/O auxiliary itself
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1843 and for any device driver support. The directory hierarchy below
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1844 <filename class="directory">libexec/ecos</filename> matches the
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1845 structure of the eCos repository, allowing multiple versions of a
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1846 package to be installed to allow for incompatible protocol changes.
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1847 </para>
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diff changeset
1848 <para>
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1849 The preferred way to build host-side software is to use
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1850 <command>autoconf</command> and <command>automake</command>. Usually
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diff changeset
1851 this involves little more than copying the
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1852 <filename>acinclude.m4</filename>, <filename>configure.in</filename>
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1853 and <filename>Makefile.am</filename> files from an existing package,
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diff changeset
1854 for example the synthetic target ethernet driver, and then making
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diff changeset
1855 minor edits. In <filename>acinclude.m4</filename> it may be necessary
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1856 to adjust the path to the root of the repository.
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diff changeset
1857 <filename>configure.in</filename> may require a similar change, and
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diff changeset
1858 the <function>AC_INIT</function> macro invocation will have to be
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diff changeset
1859 changed to match one of the files in the new package. A critical macro
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1860 in this file is <filename>ECOS_PACKAGE_DIRS</filename> which will set
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diff changeset
1861 up the correct install directory. <filename>Makefile.am</filename> may
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diff changeset
1862 require some more changes, for example to specify the data files that
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1863 should be installed (including the Tcl script). These files should
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1864 then be processed using <command>aclocal</command>,
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diff changeset
1865 <command>autoconf</command> and <command>automake</command> in that
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diff changeset
1866 order. Actually building the software then just involves
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diff changeset
1867 <command>configure</command>, <command>make</command> and
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diff changeset
1868 <command>make install</command>, as per the instructions in the
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1869 toplevel <filename>README.host</filename> file.
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diff changeset
1870 </para>
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diff changeset
1871 <para>
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diff changeset
1872 To assist developers, if the environment variable
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1873 <envar>ECOSYNTH_DEVEL</envar> is set then a slightly different
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diff changeset
1874 algorithm is used for locating device Tcl scripts. Instead of looking
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1875 only in the install tree the I/O auxiliary will also look in the
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diff changeset
1876 source tree, and if the script there is more recent than the installed
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diff changeset
1877 version it will be used in preference. This allows developers to
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diff changeset
1878 modify the master copy without having to run <command>make
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1879 install</command> all the time.
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diff changeset
1880 </para>
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diff changeset
1881 <para>
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1882 If a script needs to know where it has been installed it can examine
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diff changeset
1883 the Tcl variable <varname>synth::device_install_dir</varname> . This
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diff changeset
1884 variable gets updated whenever a script is loaded, so if the
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1885 value may be needed later it should be saved away in a device-specific
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diff changeset
1886 variable.
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1887 </para>
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1888 </refsect1>
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diff changeset
1889
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1890 <refsect1 id="synth-new-host-instantiation"><title>Instantiation</title>
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1891 <para>
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1892 The I/O auxiliary will <command>source</command> the device-specific
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1893 Tcl script when the eCos application first attempts to instantiate a
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diff changeset
1894 device of that type. The script should return a procedure that will be
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diff changeset
1895 invoked to instantiate a device.
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diff changeset
1896 </para>
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diff changeset
1897 <programlisting>
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diff changeset
1898 namespace eval ethernet {
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diff changeset
1899 &hellip;
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diff changeset
1900 proc instantiate { id instance data } {
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1901 &hellip;
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1902 return ethernet::handle_request
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1903 }
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1904 }
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1905 return ethernet::instantiate
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1906 </programlisting>
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1907 <para>
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1908 The <varname>id</varname> argument is a unique identifier for this
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1909 device instance. It will also be supplied on subsequent calls to the
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1910 request handler, and will match the return value of
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1911 <function>synth_auxiliary_instantiate</function> on the target side. A
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1912 common use for this value is as an array index to support multiple
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1913 instances of this types of device. The <varname>instance</varname> and
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1914 <varname>data</varname> arguments match the corresponding arguments to
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1915 <function>synth_auxiliary_instantiate</function> on the target side, so
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1916 a typical value for <varname>instance</varname> would be
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1917 <literal>eth0</literal>, and <varname>data</varname> is used to pass
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1918 arbitrary initialization parameters from target to host.
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1919 </para>
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1920 <para>
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1921 The actual work done by the instantiation procedure is obviously
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1922 device-specific. It may involve allocating an <link
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1923 linkend="synth-new-host-interrupts">interrupt vector</link>, adding a
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1924 device-specific subwindow to the display, opening a real Linux device,
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1925 establishing a socket connection to some server, spawning a separate
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1926 process to handle the actual I/O, or a combination of some or all of
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1927 the above.
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1928 </para>
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1929 <para>
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1930 If the device is successfully instantiated then the return value
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1931 should be a handler for subsequent I/O requests. Otherwise the return
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1932 value should be an empty string, and on the target-side the
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1933 <function>synth_auxiliary_instantiate</function> call will return
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1934 <literal>-1</literal>. The script is responsible for providing
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1935 <link linkend="synth-new-host-output">diagnostics</link> explaining
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1936 why the device could not be instantiated.
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1937 </para>
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1938 </refsect1>
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1939
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1940 <refsect1 id="synth-new-host-requests"><title>Handling Requests</title>
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1941 <para>
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1942 When the target-side calls
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1943 <function>synth_auxiliary_xchgmsg</function>, the I/O auxiliary will
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1944 end up calling the request handler for the appropriate device instance
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1945 returned during instantiation:
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1946 </para>
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1947 <programlisting>
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1948 namespace eval ethernet {
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1949 &hellip;
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1950 proc handle_request { id request arg1 arg2 txdata txlen max_rxlen } {
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1951 &hellip;
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1952 if { &lt;some condition&gt; } {
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1953 synth::send_reply &lt;error code&gt; 0 ""
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1954 return
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1955 }
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1956 &hellip;
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1957 synth::send_reply &lt;reply code&gt; $packet_len $packet
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1958 }
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1959 &hellip;
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1960 }
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1961 </programlisting>
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1962 <para>
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1963 The <varname>id</varname> argument is the same device id that was
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1964 passed to the instantiate function, and is typically used as an array
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1965 index to access per-device data. The <varname>request</varname>,
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1966 <varname>arg1</varname>, <varname>arg2</varname>, and
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1967 <varname>max_rxlen</varname> are the same values that were passed to
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1968 <function>synth_auxiliary_xchgmsg</function> on the target-side,
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1969 although since this is a Tcl script obviously the numbers have been
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1970 converted to strings. The <varname>txdata</varname> buffer is raw data
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1971 as transmitted by the target, or an empty string if the I/O operation
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1972 does not involve any additional data. The Tcl procedures
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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1973 <command>binary scan</command>, <command>string index</command> and
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1974 <command>string range</command> may be found especially useful when
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1975 manipulating this buffer. <varname>txlen</varname> is provided for
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1976 convenience, although <command>string length $txdata</command> would
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1977 give the same information.
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1978 </para>
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1979 <para>
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1980 The code for actually processing the request is of course device
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1981 specific. If the target does not expect a reply then the request
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1982 handler should just return when finished. If a reply is expected then
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1983 there should be a call to <command>synth::send_reply</command>. The
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1984 first argument is the reply code, and will be turned into a 32-bit
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1985 integer on the target side. The second argument specifies the length
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1986 of the reply data, and the third argument is the reply data itself.
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diff changeset
1987 For some devices the Tcl procedure <command>binary format</command>
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1988 may prove useful. If the reply involves just a code and no additional
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diff changeset
1989 data, the second and third arguments should be <literal>0</literal>
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1990 and an empty string respectively.
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1991 </para>
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1992 <para>
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1993 Attempts to send a reply when none is expected, fail to send a reply
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1994 when one is expected, or send a reply that is larger than the
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diff changeset
1995 target-side expects, will all be detected by the I/O auxiliary and
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1996 result in run-time error messages.
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1997 </para>
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diff changeset
1998 <para>
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1999 It is not possible for the host-side code to send unsolicited messages
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2000 to the target. If host-side code needs attention from the target, for
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2001 example because some I/O operation has completed, then an interrupt
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2002 should be raised.
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diff changeset
2003 </para>
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diff changeset
2004 </refsect1>
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2005
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diff changeset
2006 <refsect1 id="synth-new-host-interrupts"><title>Interrupts</title>
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2007 <para>
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diff changeset
2008 The I/O auxiliary provides a number of procedures for interrupt
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diff changeset
2009 handling.
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diff changeset
2010 </para>
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diff changeset
2011 <programlisting>
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diff changeset
2012 synth::interrupt_allocate &lt;name&gt;
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diff changeset
2013 synth::interrupt_get_max
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diff changeset
2014 synth::interrupt_get_devicename &lt;vector&gt;
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diff changeset
2015 synth::interrupt_raise &lt;vector&gt;
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diff changeset
2016 </programlisting>
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diff changeset
2017 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2018 <command>synth::interrupt_allocate</command> is normally called during
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2019 device instantiation, and returns the next free interrupt vector. This
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2020 can be passed on to the target-side device driver in response to a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2021 suitable request, and it can then install an interrupt handler on that
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2022 vector. Interrupt vector <literal>0</literal> is used within the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2023 target-side code for the real-time clock, so the allocated vectors
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2024 will start at <literal>1</literal>. The argument identifies the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2025 device, for example <literal>eth0</literal>. This is not actually used
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2026 internally, but can be accessed by user-initialization scripts that
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2027 provide some sort of interrupt monitoring facility (typically via the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2028 <literal>interrupt</literal> <link
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2029 linkend="synth-new-host-hooks">hook</link>). It is possible for a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2030 single device to allocate multiple interrupt vectors, but the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
2031 synthetic target supports a maximum of 32 such vectors.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2032 </para>
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diff changeset
2033 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2034 <command>synth::interrupt_get_max</command> returns the highest
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2035 interrupt vector that has been allocated, or <literal>0</literal> if
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2036 there have been no calls to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2037 <command>synth::interrupt_allocate</command>.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2038 <command>synth::interrupt_get_devicename</command> returns the string
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diff changeset
2039 that was passed to <command>synth::interrupt_allocate</command> when
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diff changeset
2040 the vector was allocated.
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diff changeset
2041 </para>
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diff changeset
2042 <para>
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diff changeset
2043 <command>synth::interrupt_raise</command> can be called any time after
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diff changeset
2044 initialization. The argument should be the vector returned by
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
2045 <command>synth::interrupt_allocate</command> for this device. It will
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
2046 activate the normal eCos interrupt handling mechanism so, subject to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
2047 interrupts being enabled and this particular interrupt not being
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
2048 masked out, the appropriate ISR will run.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2049 </para>
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diff changeset
2050 <note><para>
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diff changeset
2051 At this time it is not possible for a device to allocate a specific
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
2052 interrupt vector. The order in which interrupt vectors are assigned to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
2053 devices effectively depends on the order in which the eCos devices get
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bartv
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diff changeset
2054 initialized, and that may change if the eCos application is rebuilt. A
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bartv
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diff changeset
2055 future extension may allow devices to allocate specific vectors, thus
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
2056 making things more deterministic. However that will introduce new
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2057 problems, in particular the code will have to start worrying about
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bartv
parents: 210
diff changeset
2058 requests for vectors that have already been allocated.
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bartv
parents: 210
diff changeset
2059 </para></note>
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bartv
parents: 210
diff changeset
2060 </refsect1>
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bartv
parents: 210
diff changeset
2061
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parents: 210
diff changeset
2062 <refsect1 id="synth-new-host-args"><title>Flags and Command Line Arguments</title>
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diff changeset
2063 <para>
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bartv
parents: 210
diff changeset
2064 The generic I/O auxiliary code will process the standard command line
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2065 arguments, and will set various flag variables accordingly. Some of
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2066 these should be checked by device-specific scripts.
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bartv
parents: 210
diff changeset
2067 </para>
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parents: 210
diff changeset
2068 <variablelist>
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parents: 210
diff changeset
2069 <varlistentry>
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parents: 210
diff changeset
2070 <term><varname>synth::flag_gui</varname></term>
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bartv
parents: 210
diff changeset
2071 <listitem><para>
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bartv
parents: 210
diff changeset
2072 This is set when the I/O auxiliary is operating in graphical mode
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bartv
parents: 210
diff changeset
2073 rather than text mode. Some functionality such as filters and the GUI
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bartv
parents: 210
diff changeset
2074 layout are only available in graphical mode.
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bartv
parents: 210
diff changeset
2075 </para>
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bartv
parents: 210
diff changeset
2076 <programlisting>
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bartv
parents: 210
diff changeset
2077 if { $synth::flag_gui } {
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bartv
parents: 210
diff changeset
2078 &hellip;
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bartv
parents: 210
diff changeset
2079 }
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bartv
parents: 210
diff changeset
2080 </programlisting></listitem>
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bartv
parents: 210
diff changeset
2081 </varlistentry>
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bartv
parents: 210
diff changeset
2082 <varlistentry>
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bartv
parents: 210
diff changeset
2083 <term><varname>synth::flag_verbose</varname></term>
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bartv
parents: 210
diff changeset
2084 <listitem><para>
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bartv
parents: 210
diff changeset
2085 The user has requested additional information during startup. Each
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bartv
parents: 210
diff changeset
2086 device driver can decide how much additional information, if any,
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bartv
parents: 210
diff changeset
2087 should be produced.
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parents: 210
diff changeset
2088 </para></listitem>
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bartv
parents: 210
diff changeset
2089 </varlistentry>
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bartv
parents: 210
diff changeset
2090 <varlistentry>
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bartv
parents: 210
diff changeset
2091 <term><varname>synth::flag_keep_going</varname></term>
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bartv
parents: 210
diff changeset
2092 <listitem><para>
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bartv
parents: 210
diff changeset
2093 The user has specified <option>-k</option> or
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bartv
parents: 210
diff changeset
2094 <option>--keep-going</option>, so even if an error occurs the I/O
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bartv
parents: 210
diff changeset
2095 auxiliary and the various device driver scripts should continue running
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bartv
parents: 210
diff changeset
2096 if at all possible. Diagnostics should still be generated.
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bartv
parents: 210
diff changeset
2097 </para></listitem>
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parents: 210
diff changeset
2098 </varlistentry>
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bartv
parents: 210
diff changeset
2099 </variablelist>
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parents: 210
diff changeset
2100 <para>
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bartv
parents: 210
diff changeset
2101 Some scripts may want to support additional command line arguments.
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bartv
parents: 210
diff changeset
2102 This facility should be used with care since there is no way to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2103 prevent two different scripts from trying to use the same argument.
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bartv
parents: 210
diff changeset
2104 The following Tcl procedures are available:
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bartv
parents: 210
diff changeset
2105 </para>
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bartv
parents: 210
diff changeset
2106 <programlisting>
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bartv
parents: 210
diff changeset
2107 synth::argv_defined &lt;name&gt;
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bartv
parents: 210
diff changeset
2108 synth::argv_get_value &lt;name&gt;
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bartv
parents: 210
diff changeset
2109 </programlisting>
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bartv
parents: 210
diff changeset
2110 <para>
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bartv
parents: 210
diff changeset
2111 <command>synth::argv_defined</command> returns a boolean to indicate
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2112 whether or not a particular argument is present. If the argument is
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bartv
parents: 210
diff changeset
2113 the name part of a name/value pair, an <literal>=</literal> character
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2114 should be appended. Typical uses might be:
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bartv
parents: 210
diff changeset
2115 </para>
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bartv
parents: 210
diff changeset
2116 <programlisting>
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bartv
parents: 210
diff changeset
2117 if { [synth::argv_defined "-o13"] } {
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bartv
parents: 210
diff changeset
2118 &hellip;
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bartv
parents: 210
diff changeset
2119 }
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bartv
parents: 210
diff changeset
2120
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bartv
parents: 210
diff changeset
2121 if { [synth::argv_defined "-mark="] } {
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bartv
parents: 210
diff changeset
2122 &hellip;
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bartv
parents: 210
diff changeset
2123 }
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bartv
parents: 210
diff changeset
2124 </programlisting>
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bartv
parents: 210
diff changeset
2125 <para>
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bartv
parents: 210
diff changeset
2126 The first call checks for a flag <literal>-o13</literal> or
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2127 <literal>--o13</literal> - the code treats options with single and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2128 double hyphens interchangeably. The second call checks for an argument
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bartv
parents: 210
diff changeset
2129 of the form <literal>-mark=&lt;value&gt;</literal> or a pair of
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2130 arguments <literal>-mark &lt;value&gt;</literal>. The value part of a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2131 name/value pair can be obtained using
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2132 <command>synth::argv_get_value</command>;
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bartv
parents: 210
diff changeset
2133 </para>
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bartv
parents: 210
diff changeset
2134 <programlisting>
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bartv
parents: 210
diff changeset
2135 variable speed 1
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2136 if { [synth::argv_defined "-mark="] } {
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bartv
parents: 210
diff changeset
2137 set mark [synth::argv_get_value "-mark="]
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bartv
parents: 210
diff changeset
2138 if { ![string is integer $mark] || ($mark < 1) || ($mark > 9) } {
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bartv
parents: 210
diff changeset
2139 &lt;issue diagnostic&gt;
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bartv
parents: 210
diff changeset
2140 } else {
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bartv
parents: 210
diff changeset
2141 set speed $mark
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2142 }
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2143 }
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bartv
parents: 210
diff changeset
2144 </programlisting>
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bartv
parents: 210
diff changeset
2145 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2146 <command>synth::argv_get_value</command> should only be used after a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2147 successful call to <command>synth::argv_defined</command>.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2148 At present there is no support for some advanced forms of command line
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2149 argument processing. For example it is not possible to repeat a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2150 certain option such as <option>-v</option> or
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2151 <option>--verbose</option>, with each occurrence increasing the level
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bartv
parents: 210
diff changeset
2152 of verbosity.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2153 </para>
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bartv
parents: 210
diff changeset
2154 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2155 If a script is going to have its own set of command-line arguments
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2156 then it should give appropriate details if the user specifies
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2157 <option>--help</option>. This involves a hook function:
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bartv
parents: 210
diff changeset
2158 </para>
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bartv
parents: 210
diff changeset
2159 <programlisting>
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bartv
parents: 210
diff changeset
2160 namespace eval my_device {
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bartv
parents: 210
diff changeset
2161 proc help_hook { } {
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bartv
parents: 210
diff changeset
2162 puts " -o13 : activate the omega 13 device"
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bartv
parents: 210
diff changeset
2163 puts " -mark &lt;speed&gt; : set speed. Valid values are 1 to 9."
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bartv
parents: 210
diff changeset
2164 }
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bartv
parents: 210
diff changeset
2165
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2166 synth::hook_add "help" my_device::help_hook
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bartv
parents: 210
diff changeset
2167 }
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bartv
parents: 210
diff changeset
2168 </programlisting>
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bartv
parents: 210
diff changeset
2169 </refsect1>
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bartv
parents: 210
diff changeset
2170
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2171 <refsect1 id="synth-new-host-tdf"><title>The Target Definition File</title>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2172 <para>
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bartv
parents: 210
diff changeset
2173 Most device scripts will want to check entries in the target
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2174 definition file for run-time configuration information. The Tcl
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2175 procedures for this are as follows:
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bartv
parents: 210
diff changeset
2176 </para>
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bartv
parents: 210
diff changeset
2177 <programlisting>
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bartv
parents: 210
diff changeset
2178 synth::tdf_has_device &lt;name&gt;
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bartv
parents: 210
diff changeset
2179 synth::tdf_get_devices
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bartv
parents: 210
diff changeset
2180 synth::tdf_has_option &lt;devname&gt; &lt;option&gt;
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bartv
parents: 210
diff changeset
2181 synth::tdf_get_option &lt;devname&gt; &lt;option&gt;
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bartv
parents: 210
diff changeset
2182 synth::tdf_get_options &lt;devname&gt; &lt;option&gt;
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bartv
parents: 210
diff changeset
2183 synth::tdf_get_all_options &lt;devname&gt;
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bartv
parents: 210
diff changeset
2184 </programlisting>
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bartv
parents: 210
diff changeset
2185 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2186 <command>synth::tdf_has_device</command> can be used to check whether
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2187 or not the target definition file had an entry
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2188 <literal>synth_device&nbsp;&lt;name&gt;</literal>. Usually the name
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2189 will match the type of device, so the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2190 <filename>console.tcl</filename> script will look for a target
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2191 definition file entry <literal>console</literal>.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2192 <command>synth::tdf_get_devices</command> returns a list of all
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2193 device entries in the target definition file.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2194 </para>
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bartv
parents: 210
diff changeset
2195 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2196 Once it is known that the target definition file has an entry for a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2197 certain device, it is possible to check for options within the entry.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2198 <command>synth::tdf_has_option</command> just checks for the presence,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2199 returning a boolean:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2200 </para>
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bartv
parents: 210
diff changeset
2201 <programlisting>
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bartv
parents: 210
diff changeset
2202 if { [synth::tdf_has_option "console" "appearance"] } {
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bartv
parents: 210
diff changeset
2203 &hellip;
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2204 }
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bartv
parents: 210
diff changeset
2205 </programlisting>
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bartv
parents: 210
diff changeset
2206 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2207 <command>synth::tdf_get_option</command> returns a list of all the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2208 arguments for a given option. For example, if the target definition
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bartv
parents: 210
diff changeset
2209 file contains an entry:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2210 </para>
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bartv
parents: 210
diff changeset
2211 <programlisting>
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bartv
parents: 210
diff changeset
2212 synth_device console {
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bartv
parents: 210
diff changeset
2213 appearance -foreground white -background black
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2214 filter trace {^TRACE:.*} -foreground HotPink1 -hide 1
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bartv
parents: 210
diff changeset
2215 filter xyzzy {.*xyzzy.*} -foreground PapayaWhip
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bartv
parents: 210
diff changeset
2216 }
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2217 </programlisting>
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bartv
parents: 210
diff changeset
2218 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2219 A call
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bartv
parents: 210
diff changeset
2220 <command>synth::tdf_get_option&nbsp;console&nbsp;appearance</command>
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bartv
parents: 210
diff changeset
2221 will return the list <literal>{-foreground white -background
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2222 black}</literal>. This list can be manipulated using standard Tcl routines
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2223 such as <command>llength</command> and <command>lindex</command>. Some
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diff changeset
2224 options can occur multiple times in one entry, for example
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diff changeset
2225 <option>filter</option> in the <literal>console</literal> entry.
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diff changeset
2226 <command>synth::tdf_get_options</command> returns a list of lists,
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diff changeset
2227 with one entry for each option occurrence.
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diff changeset
2228 <command>synth::tdf_get_all_options</command> returns a list of lists
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diff changeset
2229 of all options. This time each entry will include the option name as
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diff changeset
2230 well.
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diff changeset
2231 </para>
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diff changeset
2232 <para>
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diff changeset
2233 The I/O auxiliary will not issue warnings about entries in the target
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diff changeset
2234 definition file for devices which were not loaded, unless the
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diff changeset
2235 <option>-v</option> or <option>--verbose</option> command line
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diff changeset
2236 argument was used. This makes it easier to use a single target
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diff changeset
2237 definition file for different applications. However the auxiliary will
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diff changeset
2238 issue warnings about options within an entry that were ignored,
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diff changeset
2239 because often these indicate a typing mistake of some sort. Hence a
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diff changeset
2240 script should always call <command>synth::tdf_has_option</command>,
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diff changeset
2241 <command>synth:;tdf_get_option</command> or
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diff changeset
2242 <command>synth::tdf_get_options</command> for all valid options, even
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diff changeset
2243 if some of the options preclude the use of others.
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diff changeset
2244 </para>
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diff changeset
2245 </refsect1>
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2246
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2247 <refsect1 id="synth-new-host-hooks"><title>Hooks</title>
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2248 <para>
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diff changeset
2249 Some scripts may want to take action when particular events occur, for
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2250 example when the eCos application has exited and there is no need for
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2251 further I/O. This is supported using hooks:
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2252 </para>
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2253 <programlisting>
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2254 namespace eval my_device {
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diff changeset
2255 &hellip;
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diff changeset
2256 proc handle_ecos_exit { arg_list } {
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diff changeset
2257 &hellip;
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diff changeset
2258 }
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diff changeset
2259 synth::hook_add "ecos_exit" my_device::handle_ecos_exit
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diff changeset
2260 }
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diff changeset
2261 </programlisting>
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diff changeset
2262 <para>
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diff changeset
2263 It is possible for device scripts to add their own hooks and call all
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diff changeset
2264 functions registered for those hooks. A typical use for this is by
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diff changeset
2265 user initialization scripts that want to monitor some types of I/O.
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diff changeset
2266 The available Tcl procedures for manipulating hooks are:
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diff changeset
2267 </para>
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diff changeset
2268 <programlisting>
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2269 synth::hook_define &lt;name&gt;
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diff changeset
2270 synth::hook_defined &lt;name&gt;
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diff changeset
2271 synth::hook_add &lt;name&gt; &lt;function&gt;
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diff changeset
2272 synth::hook_call &lt;name&gt; &lt;args&gt;
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diff changeset
2273 </programlisting>
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diff changeset
2274 <para>
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diff changeset
2275 <command>synth::hook_define</command> creates a new hook with the
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diff changeset
2276 specified name. This hook must not already exist.
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diff changeset
2277 <command>synth::hook_defined</command> can be used to check for the
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parents: 210
diff changeset
2278 existence of a hook. <command>synth::hook_add</command> allows other
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diff changeset
2279 scripts to register a callback function for this hook, and
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parents: 210
diff changeset
2280 <command>synth::hook_call</command> allows the owner script to invoke
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diff changeset
2281 all such callback functions. A hook must already be defined before a
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diff changeset
2282 callback can be attached. Therefore typically device scripts will only
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diff changeset
2283 use standard hooks and their own hooks, not hooks created by some
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diff changeset
2284 other device, because the order of device initialization is not
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parents: 210
diff changeset
2285 sufficiently defined. User scripts run from
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diff changeset
2286 <filename>mainrc.tcl</filename> can use any hooks that have been
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diff changeset
2287 defined.
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diff changeset
2288 </para>
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diff changeset
2289 <para>
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diff changeset
2290 <command>synth::hook_call</command> takes an arbitrary list of
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diff changeset
2291 arguments, for example:
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diff changeset
2292 </para>
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diff changeset
2293 <programlisting>
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diff changeset
2294 synth::hook_call "ethernet_rx" "eth0" $packet
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diff changeset
2295 </programlisting>
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diff changeset
2296 <para>
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diff changeset
2297 The callback function will always be invoked with a single argument,
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diff changeset
2298 a list of the arguments that were passed to
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diff changeset
2299 <command>synth::hook_call</command>:
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diff changeset
2300 </para>
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diff changeset
2301 <programlisting>
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2302 proc rx_callback { arg_list } {
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2303 set device [lindex $arg_list 0]
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diff changeset
2304 set packet [lindex $arg_list 1]
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2305 }
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diff changeset
2306 </programlisting>
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diff changeset
2307 <para>
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diff changeset
2308 Although it might seem more appropriate to use Tcl's
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diff changeset
2309 <command>eval</command> procedure and have the callback functions
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parents: 210
diff changeset
2310 invoked with the right number of arguments rather than a single list,
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diff changeset
2311 that would cause serious problems if any of the data contained special
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diff changeset
2312 characters such as <literal>[</literal> or <literal>$</literal>. The
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diff changeset
2313 current implementation of hooks avoids such problems, at the cost of
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parents: 210
diff changeset
2314 minor inconvenience when writing callbacks.
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parents: 210
diff changeset
2315 </para>
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diff changeset
2316 <para>
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diff changeset
2317 A number of hooks are defined as standard. Some devices will add
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diff changeset
2318 additional hooks, and the device-specific documentation should be
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diff changeset
2319 consulted for those. User scripts can add their own hooks if desired.
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diff changeset
2320 </para>
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diff changeset
2321 <variablelist>
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diff changeset
2322 <varlistentry>
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2323 <term><literal>exit</literal></term>
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2324 <listitem><para>
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diff changeset
2325 This hook is called just before the I/O auxiliary exits. Hence it
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diff changeset
2326 provides much the same functionality as <function>atexit</function> in
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diff changeset
2327 C programs. The argument list passed to the callback function will be
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diff changeset
2328 empty.
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diff changeset
2329 </para></listitem>
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2330 </varlistentry>
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diff changeset
2331 <varlistentry>
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diff changeset
2332 <term><literal>ecos_exit</literal></term>
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diff changeset
2333 <listitem><para>
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diff changeset
2334 This hook is called when the eCos application has exited. It is used
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diff changeset
2335 mainly to shut down I/O operations: if the application is no longer
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diff changeset
2336 running then there is no point in raising interrupts or storing
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diff changeset
2337 incoming packets. The callback argument list will be empty.
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diff changeset
2338 </para></listitem>
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diff changeset
2339 </varlistentry>
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diff changeset
2340 <varlistentry>
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diff changeset
2341 <term><literal>ecos_initialized</literal></term>
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diff changeset
2342 <listitem><para>
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diff changeset
2343 The synthetic target HAL will send a request to the I/O auxiliary once
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diff changeset
2344 the static constructors have been run. All devices should now have been
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diff changeset
2345 instantiated. A script could now check how many instances there are of
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diff changeset
2346 a given type of device, for example ethernet devices, and create a
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diff changeset
2347 little monitor window showing traffic on all the devices. The
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diff changeset
2348 <literal>ecos_initialized</literal> callbacks will be run just before
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diff changeset
2349 the user's <filename>mainrc.tcl</filename> script. The callback
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diff changeset
2350 argument list will be empty.
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diff changeset
2351 </para></listitem>
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diff changeset
2352 </varlistentry>
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parents: 210
diff changeset
2353 <varlistentry>
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diff changeset
2354 <term><literal>help</literal></term>
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diff changeset
2355 <listitem><para>
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diff changeset
2356 This hook is also invoked once static constructors have been run, but
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diff changeset
2357 only if the user specified <option>-h</option> or
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parents: 210
diff changeset
2358 <option>--help</option>. Any scripts that add their own command line
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parents: 210
diff changeset
2359 arguments should add a callback to this hook which outputs details of
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diff changeset
2360 the additional arguments. The callback argument list will be empty.
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parents: 210
diff changeset
2361 </para></listitem>
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diff changeset
2362 </varlistentry>
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parents: 210
diff changeset
2363 <varlistentry>
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diff changeset
2364 <term><literal>interrupt</literal></term>
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parents: 210
diff changeset
2365 <listitem><para>
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diff changeset
2366 Whenever a device calls <command>synth::interrupt_raise</command> the
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diff changeset
2367 <literal>interrupt</literal> hook will be called with a single
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diff changeset
2368 argument, the interrupt vector. The main use for this is to allow
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diff changeset
2369 user scripts to monitor interrupt traffic.
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diff changeset
2370 </para></listitem>
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diff changeset
2371 </varlistentry>
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diff changeset
2372 </variablelist>
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diff changeset
2373 </refsect1>
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diff changeset
2374
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diff changeset
2375 <refsect1 id="synth-new-host-output"><title>Output and Filters</title>
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diff changeset
2376 <para>
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diff changeset
2377 Scripts can use conventional facilities for sending text output to the
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diff changeset
2378 user, for example calling <command>puts</command> or directly
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diff changeset
2379 manipulating the central text widget
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diff changeset
2380 <varname>.main.centre.text</varname>. However in nearly all cases it
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diff changeset
2381 is better to use output facilities provided by the I/O auxiliary
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diff changeset
2382 itself:
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diff changeset
2383 </para>
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diff changeset
2384 <programlisting>
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diff changeset
2385 synth::report &lt;msg&gt;
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diff changeset
2386 synth::report_warning &lt;msg&gt;
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parents: 210
diff changeset
2387 synth::report_error &lt;msg&gt;
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diff changeset
2388 synth::internal_error &lt;msg&gt;
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parents: 210
diff changeset
2389 synth::output &lt;msg&gt; &lt;filter&gt;
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parents: 210
diff changeset
2390 </programlisting>
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parents: 210
diff changeset
2391 <para>
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parents: 210
diff changeset
2392 <command>synth::report</command> is intended for messages related to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2393 the operation of the I/O auxiliary itself, especially additional
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parents: 210
diff changeset
2394 output resulting from <option>-v</option> or
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parents: 210
diff changeset
2395 <option>--verbose</option>. If running in text mode the output will go
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parents: 210
diff changeset
2396 to standard output. If running in graphical mode the output will go to
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parents: 210
diff changeset
2397 the central text window. In both modes, use of <option>-l</option> or
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parents: 210
diff changeset
2398 <option>--logfile</option> will modify the behaviour.
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parents: 210
diff changeset
2399 </para>
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parents: 210
diff changeset
2400 <para>
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parents: 210
diff changeset
2401 <command>synth::report_warning</command>,
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parents: 210
diff changeset
2402 <command>synth::report_error</command> and
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parents: 210
diff changeset
2403 <command>synth::internal_error</command> have the obvious meaning,
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parents: 210
diff changeset
2404 including prepending strings such as <literal>Warning:</literal> and
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parents: 210
diff changeset
2405 <literal>Error:</literal>. When the eCos application informs the I/O
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parents: 210
diff changeset
2406 auxiliary that all static constructors have run, if at that point
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parents: 210
diff changeset
2407 there have been any calls to <command>synth::error</command> then the
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parents: 210
diff changeset
2408 I/O auxiliary will exit. This can be suppressed with command line
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parents: 210
diff changeset
2409 arguments <option>-k</option> or <option>--keep-going</option>.
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parents: 210
diff changeset
2410 <command>synth::internal_error</command> will output some information
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parents: 210
diff changeset
2411 about the current state of the I/O auxiliary and then exit
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parents: 210
diff changeset
2412 immediately. Of course it should never be necessary to call this
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parents: 210
diff changeset
2413 function.
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parents: 210
diff changeset
2414 </para>
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parents: 210
diff changeset
2415 <para>
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parents: 210
diff changeset
2416 <command>synth::output</command> is the main routine for outputting
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parents: 210
diff changeset
2417 text. The second argument identifies a filter. If running in text mode
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parents: 210
diff changeset
2418 the filter is ignored, but if running in graphical mode the filter can
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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diff changeset
2419 be used to control the appearance of this output. A typical use would
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parents: 210
diff changeset
2420 be:
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parents: 210
diff changeset
2421 </para>
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parents: 210
diff changeset
2422 <programlisting>
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parents: 210
diff changeset
2423 synth::output $line "console"
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parents: 210
diff changeset
2424 </programlisting>
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parents: 210
diff changeset
2425 <para>
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parents: 210
diff changeset
2426 This outputs a single line of text using the
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parents: 210
diff changeset
2427 <literal>console</literal> filter. If running in graphical mode the
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parents: 210
diff changeset
2428 default appearance of this text can be modified with the
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parents: 210
diff changeset
2429 <option>appearance</option> option in the
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parents: 210
diff changeset
2430 <command>synth_device&nbsp;console</command> entry of the target
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parents: 210
diff changeset
2431 definition file. The <guimenuitem>System filters</guimenuitem> menu
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parents: 210
diff changeset
2432 option can be used to change the appearance at run-time.
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parents: 210
diff changeset
2433 </para>
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parents: 210
diff changeset
2434 <para>
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parents: 210
diff changeset
2435 Filters should be created before they are used. The procedures
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parents: 210
diff changeset
2436 available for this are:
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parents: 210
diff changeset
2437 </para>
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parents: 210
diff changeset
2438 <programlisting>
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parents: 210
diff changeset
2439 synth::filter_exists &lt;name&gt;
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parents: 210
diff changeset
2440 synth::filter_get_list
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parents: 210
diff changeset
2441 synth::filter_add &lt;name&gt; [options]
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parents: 210
diff changeset
2442 synth::filter_parse_options &lt;options&gt; &lt;parsed_options&gt; &lt;message&gt;
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bartv
parents: 210
diff changeset
2443 synth::filter_add_parsed &lt;name&gt; &lt;parsed_options&gt;
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parents: 210
diff changeset
2444 </programlisting>
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bartv
parents: 210
diff changeset
2445 <para>
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parents: 210
diff changeset
2446 <command>synth::filter_exists</command> can be used to check whether
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2447 or not a particular filter already exists: creating two filters with
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2448 the same name is not allowed.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2449 <command>synth::filter_get_list</command> returns a list of the
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bartv
parents: 210
diff changeset
2450 current known filters. <command>synth::filter_add</command> can be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2451 used to create a new filter. The first argument names the new filter,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2452 and the remaining arguments control the initial appearance. A typical
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2453 use might be:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2454 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2455 <programlisting>
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bartv
parents: 210
diff changeset
2456 synth::filter_add "my_device_tx" -foreground yellow -hide 1
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bartv
parents: 210
diff changeset
2457 </programlisting>
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parents: 210
diff changeset
2458 <para>
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parents: 210
diff changeset
2459 It is assumed that the supplied arguments are valid, which typically
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2460 means that they are hard-wired in the script. If instead the data
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2461 comes out of a configuration file and hence may be invalid, the
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bartv
parents: 210
diff changeset
2462 I/O auxiliary provides a parsing utility. Typical usage would be:
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bartv
parents: 210
diff changeset
2463 </para>
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bartv
parents: 210
diff changeset
2464 <programlisting>
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bartv
parents: 210
diff changeset
2465 array set parsed_options [list]
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bartv
parents: 210
diff changeset
2466 set message ""
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2467 if { ![synth::filter_parse_options $console_appearance parsed_options message] } {
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bartv
parents: 210
diff changeset
2468 synth::report_error \
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bartv
parents: 210
diff changeset
2469 "Invalid entry in target definition file $synth::target_definition\
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2470 \n synth_device \"console\", entry \"appearance\"\n$message"
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bartv
parents: 210
diff changeset
2471 } else {
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parents: 210
diff changeset
2472 synth::filter_add_parsed "console" parsed_options
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bartv
parents: 210
diff changeset
2473 }
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parents: 210
diff changeset
2474 </programlisting>
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bartv
parents: 210
diff changeset
2475 <para>
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parents: 210
diff changeset
2476 On success <varname>parsed_options</varname> will be updated with an
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2477 internal representation of the desired appearance, which can then be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2478 used in a call to <command>synth::filter_add_parsed</command>. On
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bartv
parents: 210
diff changeset
2479 failure <varname>message</varname> will be updated with details of the
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bartv
parents: 210
diff changeset
2480 parsing error that occurred.
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parents: 210
diff changeset
2481 </para>
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parents: 210
diff changeset
2482 </refsect1>
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parents: 210
diff changeset
2483
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2484 <refsect1 id="synth-new-host-gui"><title>The Graphical Interface</title>
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parents: 210
diff changeset
2485 <para>
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parents: 210
diff changeset
2486 When the I/O auxiliary is running in graphical mode, many scripts will
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2487 want to update the user interface in some way. This may be as simple
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2488 as adding another entry to the help menu for the device, or adding a
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bartv
parents: 210
diff changeset
2489 new button to the toolbar. It may also involve adding new subwindows,
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2490 or even creating entire new toplevel windows. These may be simple
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bartv
parents: 210
diff changeset
2491 monitor windows, displaying additional information about what is going
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2492 on in the system in a graphical format. Alternatively they may emulate
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2493 actual I/O operations, for example button widgets could be used to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2494 emulate real physical buttons.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2495 </para>
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parents: 210
diff changeset
2496 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2497 The I/O auxiliary does not provide many procedures related to the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2498 graphical interface. Instead it is expected that scripts will just
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2499 update the widget hierarchy directly.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2500 </para>
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parents: 210
diff changeset
2501 <informalfigure PgWide=1>
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parents: 210
diff changeset
2502 <mediaobject>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2503 <imageobject>
991
fcb7cbb964ae * doc/synth.sgml: Replaced .gif with .png to get PDF
jlarmour
parents: 709
diff changeset
2504 <imagedata fileref="layout.png" Scalefit=1 Align="Center">
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2505 </imageobject>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2506 </mediaobject>
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parents: 210
diff changeset
2507 </informalfigure>
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parents: 210
diff changeset
2508 <para>
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bartv
parents: 210
diff changeset
2509 So adding a new item to the <guimenu>Help</guimenu> menu involves a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2510 <command>.menubar.help&nbsp;add</command> operation with suitable
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2511 arguments. Adding a new button to the toolbar involves creating a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2512 child window in <varname>.toolbar</varname> and packing it
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2513 appropriately. Scripts can create their own subwindows and then pack
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2514 it into one of <varname>.main.nw</varname>,
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parents: 210
diff changeset
2515 <varname>.main.n</varname>, <varname>.main.ne</varname>,
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bartv
parents: 210
diff changeset
2516 <varname>.main.w</varname>, <varname>.main.e</varname>,
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parents: 210
diff changeset
2517 <varname>.main.sw</varname>, <varname>.main.s</varname> or
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2518 <varname>.main.se</varname>. Normally the user should be allowed to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2519 <link linkend="synth-gui-layout">control</link> this via the target
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2520 definition file. The central window <varname>.main.centre</varname>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2521 should normally be left alone by other scripts since it gets used for
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2522 text output.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2523 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2524 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2525 The following graphics-related utilities may be found useful:
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2526 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2527 <programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2528 synth::load_image &lt;image name&gt; &lt;filename&gt;
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parents: 210
diff changeset
2529 synth::register_ballon_help &lt;widget&gt; &lt;message&gt;
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bartv
parents: 210
diff changeset
2530 synth::handle_help &lt;URL&gt;
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bartv
parents: 210
diff changeset
2531 </programlisting>
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parents: 210
diff changeset
2532 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2533 <command>synth::load_image</command> can be used to add a new image to
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2534 the current interpreter. If the specified file has a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2535 <filename>.xbm</filename> extension then the image will be a
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2536 monochrome bitmap, otherwise it will be a colour image of some sort.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
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parents: 210
diff changeset
2537 A boolean will be returned to indicate success or failure, and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2538 suitable diagnostics will be generated if necessary.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2539 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2540 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2541 <command>synth::register_balloon_help</command> provides balloon help
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2542 for a specific widget, usually a button on the toolbar.
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bartv
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diff changeset
2543 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2544 <para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2545 <command>synth::handle_help</command> is a utility routine that can be
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
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diff changeset
2546 installed as the command for displaying online help, for example:
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diff changeset
2547 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2548 <programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2549 .menubar.help add command -label "my device" -command \
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2550 [list synth::handle_help "file://$path"]
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2551 </programlisting>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2552 </refsect1>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2553
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2554 </refentry>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2555
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2556 <!-- }}} -->
208
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jlarmour
parents:
diff changeset
2557 <!-- {{{ Porting -->
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jlarmour
parents:
diff changeset
2558
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2559 <refentry id="synth-porting">
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2560 <refmeta>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2561 <refentrytitle>Porting</refentrytitle>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2562 </refmeta>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2563 <refnamediv>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2564 <refname>Porting</refname>
332
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bartv
parents: 210
diff changeset
2565 <refpurpose>Adding support for other hosts</refpurpose>
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2566 </refnamediv>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2567
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2568 <refsect1 id="synth-porting-description"><title>Description</title>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2569 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2570 The initial development effort of the eCos synthetic target happened
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2571 on x86 Linux machines. Porting to other platforms involves addressing
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2572 a number of different issues. Some ports should be fairly
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2573 straightforward, for example a port to Linux on a processor other than
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2574 an x86. Porting to Unix or Unix-like operating systems other than
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2575 Linux may be possible, but would involve more effort. Porting to a
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2576 completely different operating system such as Windows would be very
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2577 difficult. The text below complements the eCos Porting Guide.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2578 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2579 </refsect1>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2580
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2581 <refsect1 id="synth-porting-linux"><title>Other Linux Platforms</title>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2582 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2583 Porting the synthetic target to a Linux platform that uses a processor
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2584 other than x86 should be straightforward. The simplest approach is to
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2585 copy the existing <filename class="directory">i386linux</filename>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2586 directory tree in the <filename class="directory">hal/synth</filename>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2587 hierarchy, then rename and edit the ten or so files in this package.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2588 Most of the changes should be pretty obvious, for example on a 64-bit
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2589 processor some new data types will be needed in the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2590 <filename>basetype.h</filename> header file. It will also be necessary
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2591 to update the toplevel <filename>ecos.db</filename> database with an
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2592 entry for the new HAL package, and a new target entry will be needed.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2593 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2594 <para>
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2595 Obviously a different processor will have different register sets and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2596 calling conventions, so the code for saving and restoring thread
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2597 contexts and for implementing <function>setjmp</function> and
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2598 <function>longjmp</function> will need to be updated. The exact way of
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2599 performing Linux system calls will vary: on x86 linux this usually
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2600 involves pushing some registers on the stack and then executing an
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2601 <literal>int&nbsp;0x080</literal> trap instruction, but on a different
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2602 processor the arguments might be passed in registers instead and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2603 certainly a different trap instruction will be used. The startup code
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2604 is written in assembler, but needs to do little more than extract the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2605 process' argument and environment variables and then jump to the main
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2606 <function>linux_entry</function> function provided by the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2607 architectural synthetic target HAL package.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2608 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2609 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2610 The header file <filename>hal_io.h</filename> provided by the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2611 architectural HAL package provides various structure definitions,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2612 function prototypes, and macros related to system calls. These are
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2613 correct for x86 linux, but there may be problems on other processors.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2614 For example a structure field that is currently defined as a 32-bit
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2615 number may in fact may be a 64-bit number instead.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2616 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2617 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2618 The synthetic target's memory map is defined in two files in the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2619 <filename class="directory">include/pkgconf</filename> subdirectory.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2620 For x86 the default memory map involves eight megabytes of read-only
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2621 memory for the code at location 0x1000000 and another eight megabytes
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2622 for data at 0x2000000. These address ranges may be reserved for other
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2623 purposes on the new architecture, so may need changing. There may be
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2624 some additional areas of memory allocated by the system for other
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2625 purposes, for example the startup stack and any environment variables,
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2626 but usually eCos applications can and should ignore those.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2627 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2628 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2629 Other HAL functionality such as interrupt handling, diagnostics, and
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2630 the system clock are provided by the architectural HAL package and
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2631 should work on different processors with few if any changes. There may
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2632 be some problems in the code that interacts with the I/O auxiliary
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2633 because of lurking assumptions about endianness or the sizes of
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2634 various data types.
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2635 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2636 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2637 When porting to other processors, a number of sources of information
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2638 are likely to prove useful. Obviously the Linux kernel sources and
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2639 header files constitute the ultimate authority on how things work at
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2640 the system call level. The GNU C library sources may also prove very
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2641 useful: for a normal Linux application it is the C library that
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2642 provides the startup code and the system call interface.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2643 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2644 </refsect1>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2645
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2646 <refsect1 id="synth-porting-unix"><title>Other Unix Platforms</title>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2647 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2648 Porting to a Unix or Unix-like operating system other than Linux would
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2649 be somewhat more involved. The first requirement is toolchains: the
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2650 GNU compilers, gcc and g++, must definitely be used; use of other GNU
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2651 tools such as the linker may be needed as well, because eCos depends
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2652 on functionality such as prioritizing C++ static constructors, and
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2653 other linkers may not implement this or may implement it in a
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2654 different and incompatible way. A closely related requirement is the
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2655 use of ELF format for binary executables: if the operating system
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2656 still uses an older format such as COFF then there are likely to be
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2657 problems because they do not provide the flexibility required by eCos.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2658 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2659 <para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2660 In the architectural HAL there should be very little code that is
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2661 specific to Linux. Instead the code should work on any operating
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2662 system that provides a reasonable implementation of the POSIX
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2663 standard. There may be some problems with program startup, but those
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2664 could be handled at the architectural level. Some changes may also be
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2665 required to the exception handling code. However one file which will
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2666 present a problem is <filename>hal_io.h</filename>, which contains
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2667 various structure definitions and macros used with the system call
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2668 interface. It is likely that many of these definitions will need
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2669 changing, and it may well be appropriate to implement variant HAL
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2670 packages for the different operating systems where this information
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2671 can be separated out. Another possible problem is that the generic
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2672 code assumes that system calls such as
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2673 <function>cyg_hal_sys_write</function> are available. On an operating
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2674 system other than Linux it is possible that some of these are not
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2675 simple system calls, and instead wrapper functions will need to be
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2676 implemented at the variant HAL level.
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2677 </para>
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2678 <para>
332
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2679 The generic I/O auxiliary code should be fairly portable to other Unix
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2680 platforms. However some of the device drivers may contain code that is
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2681 specific to Linux, for example the <literal>PF_PACKET</literal> socket
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2682 address family and the ethertap virtual tunnelling interface. These
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2683 may prove quite difficult to port.
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2684 </para>
7c1c8dc43ba1 Now witness the firepower of this fully armed and operational
bartv
parents: 210
diff changeset
2685 <para>
208
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2686 The remaining porting task is to implement one or more platform HAL
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2687 packages, one per processor type that is supported. This should
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2688 involve much the same work as a port to <link
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jlarmour
parents:
diff changeset
2689 linkend="synth-porting-linux">another processor running Linux</link>.
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jlarmour
parents:
diff changeset
2690 </para>
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jlarmour
parents:
diff changeset
2691 <para>
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jlarmour
parents:
diff changeset
2692 When using other Unix operating systems the kernel source code may not
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jlarmour
parents:
diff changeset
2693 be available, which would make any porting effort more challenging.
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jlarmour
parents:
diff changeset
2694 However there is still a good chance that the GNU C library will have
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2695 been ported already, so its source code may contain much useful
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jlarmour
parents:
diff changeset
2696 information.
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jlarmour
parents:
diff changeset
2697 </para>
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jlarmour
parents:
diff changeset
2698 </refsect1>
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jlarmour
parents:
diff changeset
2699
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parents:
diff changeset
2700 <refsect1 id="synth-porting-other"><title>Windows Platforms</title>
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parents:
diff changeset
2701 <para>
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jlarmour
parents:
diff changeset
2702 Porting the current synthetic target code to some version of Windows
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jlarmour
parents:
diff changeset
2703 or to another non-Unix platform is likely to prove very difficult. The
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2704 first hurdle that needs to be crossed is the file format for binary
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jlarmour
parents:
diff changeset
2705 executables: current Windows implementations do not use ELF, instead
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jlarmour
parents:
diff changeset
2706 they use their own format PE which is a variant of the rather old and
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2707 limited COFF format. It may well prove easier to first write an ELF
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jlarmour
parents:
diff changeset
2708 loader for Windows executables, rather than try to get eCos to work
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2709 within the constraints of PE. Of course that introduces new problems,
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jlarmour
parents:
diff changeset
2710 for example existing source-level debuggers will still expect
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jlarmour
parents:
diff changeset
2711 executables to be in PE format.
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jlarmour
parents:
diff changeset
2712 </para>
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parents:
diff changeset
2713 <para>
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parents:
diff changeset
2714 Under Linux a synthetic target application is not linked with the
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jlarmour
parents:
diff changeset
2715 system's C library or any other standard system library. That would
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jlarmour
parents:
diff changeset
2716 cause confusion, for example both eCos and the system's C library
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jlarmour
parents:
diff changeset
2717 might try to define the <function>printf</function> function, and
e0c0827131d1 Merge from eCos master repository on 2002-05-20-20:11:54-BST
jlarmour
parents:
diff changeset
2718 introduce complications such as working with shared libraries. For
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jlarmour
parents:
diff changeset
2719 much the same reasons, a synthetic target application under Windows
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jlarmour
parents:
diff changeset
2720 should not be linked with any Windows DLL's. If an ELF loader has been
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jlarmour
parents:
diff changeset
2721 specially written then this may not be much of a problem.
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jlarmour
parents:
diff changeset
2722 </para>
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jlarmour
parents:
diff changeset
2723 <para>
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jlarmour
parents:
diff changeset
2724 The next big problem is the system call interface. Under Windows
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jlarmour
parents:
diff changeset
2725 system calls are generally made via DLL's, and it is not clear that
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jlarmour
parents:
diff changeset
2726 the underlying trap mechanism is well-documented or consistent between
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jlarmour
parents:
diff changeset
2727 different releases of Windows.
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jlarmour
parents:
diff changeset
2728 </para>
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jlarmour
parents:
diff changeset
2729 <para>
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parents:
diff changeset
2730 The current code depends on the operating system providing an
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jlarmour
parents:
diff changeset
2731 implementation of POSIX signal handling. This is used for I/O
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jlarmour
parents:
diff changeset
2732 purposes, for example <literal>SIGALRM</literal> is used for the
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jlarmour
parents:
diff changeset
2733 system clock, and for exceptions. It is not known what equivalent
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jlarmour
parents:
diff changeset
2734 functionality is available under Windows.
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jlarmour
parents:
diff changeset
2735 </para>
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jlarmour
parents:
diff changeset
2736 <para>
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jlarmour
parents:
diff changeset
2737 Given the above problems a port of the synthetic target to Windows may
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jlarmour
parents:
diff changeset
2738 or may not be technically feasible, but it would certainly require a
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jlarmour
parents:
diff changeset
2739 very large amount of effort.
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jlarmour
parents:
diff changeset
2740 </para>
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jlarmour
parents:
diff changeset
2741 </refsect1>
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jlarmour
parents:
diff changeset
2742
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jlarmour
parents:
diff changeset
2743 </refentry>
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jlarmour
parents:
diff changeset
2744
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jlarmour
parents:
diff changeset
2745 <!-- }}} -->
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diff changeset
2746
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parents:
diff changeset
2747 </part>