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annotate packages/hal/common/current/src/hal_if.c @ 1056:72c6adb4efe1

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* src/hal_if.c (delay_us): Reorganized to cope with high frequency timers by eliminating a source of arithmetic overflow.
author nickg
date Thu, 19 Jun 2003 18:27:00 +0000
parents a2dfa8bf3c57
children 965fc7fbe135
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1 //=============================================================================
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2 //
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3 // hal_if.c
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4 //
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5 // ROM/RAM interfacing functions
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6 //
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7 //=============================================================================
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 // Copyright (C) 2002 Gary Thomas
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13 // Copyright (C) 2003 Nick Garnett <nickg@calivar.com>
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14 //
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15 // eCos is free software; you can redistribute it and/or modify it under
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16 // the terms of the GNU General Public License as published by the Free
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17 // Software Foundation; either version 2 or (at your option) any later version.
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18 //
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19 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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20 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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21 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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22 // for more details.
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23 //
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24 // You should have received a copy of the GNU General Public License along
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25 // with eCos; if not, write to the Free Software Foundation, Inc.,
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26 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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27 //
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28 // As a special exception, if other files instantiate templates or use macros
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29 // or inline functions from this file, or you compile this file and link it
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30 // with other works to produce a work based on this file, this file does not
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31 // by itself cause the resulting work to be covered by the GNU General Public
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32 // License. However the source code for this file must still be made available
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33 // in accordance with section (3) of the GNU General Public License.
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34 //
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35 // This exception does not invalidate any other reasons why a work based on
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36 // this file might be covered by the GNU General Public License.
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37 //
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38 // Alternative licenses for eCos may be arranged by contacting the copyright
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39 // holders.
208
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40 // -------------------------------------------
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41 //####ECOSGPLCOPYRIGHTEND####
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42 //=============================================================================
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43 //#####DESCRIPTIONBEGIN####
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44 //
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45 // Author(s): jskov
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46 // Contributors:jskov, woehler
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47 // Date: 2000-06-07
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48 //
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49 //####DESCRIPTIONEND####
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50 //
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51 //=============================================================================
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52
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53 #include <pkgconf/hal.h>
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54
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55 #ifdef CYGPKG_KERNEL
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56 # include <pkgconf/kernel.h>
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57 #endif
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58
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59 #include <cyg/infra/cyg_ass.h> // assertions
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60
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61 #include <cyg/hal/hal_arch.h> // set/restore GP
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62
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63 #include <cyg/hal/hal_io.h> // IO macros
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64 #include <cyg/hal/hal_if.h> // our interface
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65
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66 #include <cyg/hal/hal_diag.h> // Diag IO
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67 #include <cyg/hal/hal_misc.h> // User break
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69 #include <cyg/hal/hal_stub.h> // stub functionality
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70
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71 #include <cyg/hal/hal_intr.h> // hal_vsr_table and others
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72
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73 #ifdef CYGPKG_REDBOOT
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74 #include <pkgconf/redboot.h>
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75 #ifdef CYGSEM_REDBOOT_FLASH_CONFIG
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76 #include <redboot.h>
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77 #include <flash_config.h>
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78 #endif
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79 #ifdef CYGOPT_REDBOOT_FIS
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80 #include <fis.h>
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81 #endif
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82 #endif
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83
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84 //--------------------------------------------------------------------------
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85
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86 externC void patch_dbg_syscalls(void * vector);
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87 externC void init_thread_syscall(void * vector);
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88
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89 //--------------------------------------------------------------------------
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90 // Implementations and function wrappers for monitor services
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91
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92 // flash config state queries
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93 #ifdef CYGSEM_REDBOOT_FLASH_CONFIG
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94
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95 static __call_if_flash_cfg_op_fn_t flash_config_op;
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96
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97 static cyg_bool
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98 flash_config_op( int op, char * key, void *val, int type)
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99 {
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100 cyg_bool res = false;
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101
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102 CYGARC_HAL_SAVE_GP();
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103
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104 switch ( op ) {
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105 case CYGNUM_CALL_IF_FLASH_CFG_GET:
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106 res = flash_get_config( key, val, type );
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107 break;
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108 default:
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109 // nothing else supported yet - though it is expected that "set"
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110 // will fit the same set of arguments, potentially.
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111 break;
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112 }
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113
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114 CYGARC_HAL_RESTORE_GP();
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115 return res;
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116 }
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117 #endif
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118
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119 #ifdef CYGOPT_REDBOOT_FIS
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120
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121 static __call_if_flash_fis_op_fn_t flash_fis_op;
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122
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123 static cyg_bool
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124 flash_fis_op( int op, char *name, void *val)
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125 {
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126 cyg_bool res = false;
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127 struct fis_image_desc *fis;
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128 int num;
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129
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130 CYGARC_HAL_SAVE_GP();
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131 fis = fis_lookup(name, &num);
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132 if(fis != NULL)
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133 {
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134 switch ( op ) {
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135 case CYGNUM_CALL_IF_FLASH_FIS_GET_FLASH_BASE:
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136 *(CYG_ADDRESS *)val = fis->flash_base;
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137 res = true;
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138 break;
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139 case CYGNUM_CALL_IF_FLASH_FIS_GET_SIZE:
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140 *(unsigned long *)val = fis->size;
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141 res = true;
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142 break;
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143 default:
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144 break;
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145 }
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146 }
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147 CYGARC_HAL_RESTORE_GP();
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148 return res;
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149 }
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150 #endif
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151
151
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152 //----------------------------
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153 // Delay uS
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154 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_DELAY_US
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155
156
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156 static __call_if_delay_us_t delay_us;
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157
105
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158 static void
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159 delay_us(cyg_int32 usecs)
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160 {
143
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161 CYGARC_HAL_SAVE_GP();
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162 #ifdef CYGPKG_KERNEL
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163 {
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164 cyg_int32 start, elapsed, elapsed_usec;
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165 cyg_int32 slice;
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166 cyg_int32 usec_per_period = CYGNUM_HAL_RTC_NUMERATOR/CYGNUM_HAL_RTC_DENOMINATOR/1000;
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167 cyg_int32 ticks_per_usec = CYGNUM_KERNEL_COUNTERS_RTC_PERIOD/usec_per_period;
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168
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169 do {
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170 // Spin in slices of 1/2 the RTC period. Allows interrupts
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171 // time to run without messing up the algorithm. If we
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172 // spun for 1 period (or more) of the RTC, there would also
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173 // be problems figuring out when the timer wrapped. We
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174 // may lose a tick or two for each cycle but it shouldn't
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175 // matter much.
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176
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177 // The tests against CYGNUM_KERNEL_COUNTERS_RTC_PERIOD
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178 // check for a value that would cause a 32 bit signed
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179 // multiply to overflow. But this also implies that just
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180 // multiplying by ticks_per_usec will yield a good
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181 // approximation. Otherwise we need to do the full
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182 // multiply+divide to get sufficient accuracy. Note that
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183 // this test is actually constant, so the compiler will
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184 // eliminate it and only compile the branch that is
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185 // selected.
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186
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187 if( usecs > usec_per_period/2 )
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188 slice = CYGNUM_KERNEL_COUNTERS_RTC_PERIOD/2;
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189 else if( CYGNUM_KERNEL_COUNTERS_RTC_PERIOD >= 0x7FFFFFFF/usec_per_period )
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190 slice = usecs * ticks_per_usec;
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191 else
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192 {
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193 slice = usecs*CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;
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194 slice /= usec_per_period;
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195 }
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196
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197 HAL_CLOCK_READ(&start);
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198 do {
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199 HAL_CLOCK_READ(&elapsed);
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200 elapsed = (elapsed - start); // counts up!
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201 if (elapsed < 0)
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202 elapsed += CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;
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203 } while (elapsed < slice);
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204
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205 // Adjust by elapsed, not slice, since an interrupt may
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206 // have been stalling us for some time.
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207
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208 if( CYGNUM_KERNEL_COUNTERS_RTC_PERIOD >= 0x7FFFFFFF/usec_per_period )
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209 elapsed_usec = elapsed / ticks_per_usec;
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210 else
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211 {
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212 elapsed_usec = elapsed * usec_per_period;
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213 elapsed_usec = elapsed_usec / CYGNUM_KERNEL_COUNTERS_RTC_PERIOD;
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214 }
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215
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216 // It is possible for elapsed_usec to end up zero in some
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217 // circumstances and we could end up looping indefinitely.
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218 // Avoid that by ensuring that we always decrement usec by
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219 // at least 1 each time.
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220
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221 usecs -= elapsed_usec ? elapsed_usec : 1;
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222
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223 } while (usecs > 0);
143
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224 }
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225 #else // CYGPKG_KERNEL
136
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226 #ifdef HAL_DELAY_US
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227 // Use a HAL feature if defined
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228 HAL_DELAY_US(usecs);
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229 #else
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230 // If no accurate delay mechanism, just spin for a while. Having
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231 // an inaccurate delay is much better than no delay at all. The
143
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232 // count of 10 should mean the loop takes something resembling
136
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233 // 1us on most CPUs running between 30-100MHz [depends on how many
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234 // instructions this compiles to, how many dispatch units can be
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235 // used for the simple loop, actual CPU frequency, etc]
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236 while (usecs-- > 0) {
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237 int i;
143
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238 for (i = 0; i < 10; i++);
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239 }
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240 #endif // HAL_DELAY_US
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241 #endif // CYGPKG_KERNEL
143
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242 CYGARC_HAL_RESTORE_GP();
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243 }
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244 #endif // CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_DELAY_US
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245
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246 // Reset functions
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247 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_RESET
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248
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249 static __call_if_reset_t reset;
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250
101
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251 static void
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252 reset(void)
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253 {
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254 CYGARC_HAL_SAVE_GP();
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255 // With luck, the platform defines some magic that will cause a hardware
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256 // reset.
151
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257 HAL_PLATFORM_RESET();
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258
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259 #ifdef HAL_PLATFORM_RESET_ENTRY
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260 // If that's not the case (above is an empty statement) there may
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261 // be defined an address we can jump to - and effectively
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262 // reinitialize the system. Not quite as good as a reset, but it
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263 // is often enough.
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264 goto *HAL_PLATFORM_RESET_ENTRY;
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265
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266 #else
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267 #error " no RESET_ENTRY"
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268 #endif
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269
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270 CYGARC_HAL_RESTORE_GP();
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271 }
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272
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273 // This is the system's default kill signal routine. Unless overridden
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274 // by the application, it will cause a board reset when GDB quits the
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275 // connection. (The user can avoid the reset by using the GDB 'detach'
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276 // command instead of 'kill' or 'quit').
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277 static int
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278 kill_by_reset(int __irq_nr, void* __regs)
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279 {
105
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280 CYGARC_HAL_SAVE_GP();
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281
101
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282 reset();
105
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283
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284 CYGARC_HAL_RESTORE_GP();
101
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285 return 0;
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286 }
151
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287 #endif
101
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288
151
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289 //------------------------------------
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290 // NOP service
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291 #if defined(CYGSEM_HAL_VIRTUAL_VECTOR_INIT_WHOLE_TABLE) || \
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292 defined(CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_COMMS)
101
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293 static int
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294 nop_service(void)
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295 {
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296 // This is the default service. It always returns false (0), and
151
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297 // _does not_ trigger any assertions. Clients must either cope
101
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298 // with the service failure or assert.
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299 return 0;
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300 }
151
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301 #endif
101
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302
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303 //----------------------------------
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304 // Comm controls
151
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305 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_COMMS
101
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306
112
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307 #ifdef CYGNUM_HAL_VIRTUAL_VECTOR_AUX_CHANNELS
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308 #define CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS \
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309 (CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS+CYGNUM_HAL_VIRTUAL_VECTOR_AUX_CHANNELS)
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310 #else
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311 #define CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS \
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312 CYGNUM_HAL_VIRTUAL_VECTOR_COMM_CHANNELS
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313 #endif
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314
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315 static hal_virtual_comm_table_t comm_channels[CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS+1];
103
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316
101
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317 static int
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318 set_debug_comm(int __comm_id)
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319 {
103
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320 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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321 hal_virtual_comm_table_t* __chan;
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322 int interrupt_state = 0;
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323 int res = 1, update = 0;
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324 CYGARC_HAL_SAVE_GP();
101
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325
103
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326 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
112
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327 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS,
101
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328 "Invalid channel");
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329
103
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330 switch (__comm_id) {
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331 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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332 if (__selected_id > 0)
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333 res = __selected_id-1;
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334 else if (__selected_id == 0)
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335 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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336 else
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337 res = __selected_id;
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338 break;
101
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339
103
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340 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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341 CYGACC_CALL_IF_DEBUG_PROCS_SET(0);
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342 __selected_id = __comm_id;
105
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343 break;
103
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344
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345 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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346 __comm_id = 0;
105
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347 update = 1;
103
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348 break;
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349
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350 default:
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351 __comm_id++; // skip mangler entry
105
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352 update = 1;
103
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353 break;
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354 }
105
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355
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356 if (update) {
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357 // Find the interrupt state of the channel.
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358 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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359 if (__chan)
107
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360 interrupt_state = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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361
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362 __selected_id = __comm_id;
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363 CYGACC_CALL_IF_DEBUG_PROCS_SET(comm_channels[__comm_id]);
101
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364
105
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365 // Set interrupt state on the new channel.
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366 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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367 if (interrupt_state)
107
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368 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
105
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369 else
107
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370 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_DISABLE);
105
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371 }
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372
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373 CYGARC_HAL_RESTORE_GP();
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374 return res;
101
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375 }
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376
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377 static int
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378 set_console_comm(int __comm_id)
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379 {
103
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380 static int __selected_id = CYGNUM_CALL_IF_SET_COMM_ID_EMPTY;
105
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381 int res = 1, update = 0;
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382 CYGARC_HAL_SAVE_GP();
101
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383
103
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384 CYG_ASSERT(__comm_id >= CYGNUM_CALL_IF_SET_COMM_ID_MANGLER
112
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385 && __comm_id < CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS,
101
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386 "Invalid channel");
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387
103
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388 switch (__comm_id) {
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389 case CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT:
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390 if (__selected_id > 0)
105
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391 res = __selected_id-1;
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392 else if (__selected_id == 0)
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393 res = CYGNUM_CALL_IF_SET_COMM_ID_MANGLER;
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394 else
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395 res = __selected_id;
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396 break;
101
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397
103
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398 case CYGNUM_CALL_IF_SET_COMM_ID_EMPTY:
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399 CYGACC_CALL_IF_CONSOLE_PROCS_SET(0);
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400 __selected_id = __comm_id;
105
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401 break;
103
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402
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403 case CYGNUM_CALL_IF_SET_COMM_ID_MANGLER:
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404 __comm_id = 0;
105
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405 update = 1;
103
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406 break;
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407
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408 default:
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409 __comm_id++; // skip mangler entry
105
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410 update = 1;
103
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411 break;
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412 }
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413
105
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414 if (update) {
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415 __selected_id = __comm_id;
101
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416
105
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417 CYGACC_CALL_IF_CONSOLE_PROCS_SET(comm_channels[__comm_id]);
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418 }
101
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419
105
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420 CYGARC_HAL_RESTORE_GP();
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421 return res;
101
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422 }
151
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423 #endif
101
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424
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425 //----------------------------------
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426 // Cache functions
151
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427 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_CACHE
101
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428
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429 static void
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430 flush_icache(void *__p, int __nbytes)
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431 {
105
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432 CYGARC_HAL_SAVE_GP();
101
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433 #ifdef HAL_ICACHE_FLUSH
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434 HAL_ICACHE_FLUSH( __p , __nbytes );
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435 #elif defined(HAL_ICACHE_INVALIDATE)
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436 HAL_ICACHE_INVALIDATE();
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437 #endif
105
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438 CYGARC_HAL_RESTORE_GP();
101
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439 }
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440
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441 static void
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442 flush_dcache(void *__p, int __nbytes)
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443 {
105
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444 CYGARC_HAL_SAVE_GP();
101
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445 #ifdef HAL_DCACHE_FLUSH
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446 HAL_DCACHE_FLUSH( __p , __nbytes );
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447 #elif defined(HAL_DCACHE_INVALIDATE)
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448 HAL_DCACHE_INVALIDATE();
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449 #endif
105
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450 CYGARC_HAL_RESTORE_GP();
101
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451 }
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452 #endif
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453
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454 #if defined(CYGSEM_HAL_VIRTUAL_VECTOR_DIAG)
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455 //-----------------------------------------------------------------------------
151
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456 // GDB console output mangler (O-packetizer)
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457 // COMMS init function at end.
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458
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459 // This gets called via the virtual vector console comms entry and
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460 // handles O-packetization. The debug comms entries are used for the
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461 // actual device IO.
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462 static cyg_uint8
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463 cyg_hal_diag_mangler_gdb_getc(void* __ch_data)
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464 {
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465 cyg_uint8 __ch;
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466 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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467 CYGARC_HAL_SAVE_GP();
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468
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469 __ch = CYGACC_COMM_IF_GETC(*__chan);
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470
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471 CYGARC_HAL_RESTORE_GP();
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472
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473 return __ch;
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474 }
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475
208
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476 static char __mangler_line[100];
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477 static int __mangler_pos = 0;
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478
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479 static void
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480 cyg_hal_diag_mangler_gdb_flush(void* __ch_data)
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481 {
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482 CYG_INTERRUPT_STATE old;
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483 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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484
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485 // Nothing to do if mangler buffer is empty.
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486 if (__mangler_pos == 0)
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487 return;
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488
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489 // Disable interrupts. This prevents GDB trying to interrupt us
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490 // while we are in the middle of sending a packet. The serial
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491 // receive interrupt will be seen when we re-enable interrupts
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492 // later.
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493 #if defined(CYG_HAL_STARTUP_ROM) \
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494 || !defined(CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION)
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495 HAL_DISABLE_INTERRUPTS(old);
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496 #else
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497 CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION(old);
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498 #endif
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499
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500 #if CYGNUM_HAL_DEBUG_GDB_PROTOCOL_RETRIES != 0
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501 // Only wait 500ms for data to arrive - avoid "stuck" connections
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502 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_SET_TIMEOUT, CYGNUM_HAL_DEBUG_GDB_PROTOCOL_TIMEOUT);
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503 #endif
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504
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505 while(1)
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506 {
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507 static const char hex[] = "0123456789ABCDEF";
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508 cyg_uint8 csum = 0, c1;
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509 int i;
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510
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511 CYGACC_COMM_IF_PUTC(*__chan, '$');
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512 CYGACC_COMM_IF_PUTC(*__chan, 'O');
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513 csum += 'O';
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514 for( i = 0; i < __mangler_pos; i++ )
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515 {
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516 char ch = __mangler_line[i];
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517 char h = hex[(ch>>4)&0xF];
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518 char l = hex[ch&0xF];
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519 CYGACC_COMM_IF_PUTC(*__chan, h);
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520 CYGACC_COMM_IF_PUTC(*__chan, l);
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521 csum += h;
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522 csum += l;
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523 }
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524 CYGACC_COMM_IF_PUTC(*__chan, '#');
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525 CYGACC_COMM_IF_PUTC(*__chan, hex[(csum>>4)&0xF]);
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526 CYGACC_COMM_IF_PUTC(*__chan, hex[csum&0xF]);
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527
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528 nak:
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529 #if CYGNUM_HAL_DEBUG_GDB_PROTOCOL_RETRIES != 0
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530 if (CYGACC_COMM_IF_GETC_TIMEOUT(*__chan, &c1) == 0) {
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531 c1 = '-';
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532 if (tries && (--tries == 0)) c1 = '+';
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533 }
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534 #else
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535 c1 = CYGACC_COMM_IF_GETC(*__chan);
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536 #endif
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537
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538 if( c1 == '+' ) break;
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539
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540 if( cyg_hal_is_break( &c1 , 1 ) ) {
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541 // Caller's responsibility to react on this.
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542 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(1);
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diff changeset
543 break;
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544 }
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545 if( c1 != '-' ) goto nak;
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546 }
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547
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548 __mangler_pos = 0;
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549 // And re-enable interrupts
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550 #if defined(CYG_HAL_STARTUP_ROM) \
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551 || !defined(CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION)
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552 HAL_RESTORE_INTERRUPTS(old);
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553 #else
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554 CYG_HAL_GDB_LEAVE_CRITICAL_IO_REGION(old);
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555 #endif
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556 }
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557
151
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558 static void
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559 cyg_hal_diag_mangler_gdb_putc(void* __ch_data, cyg_uint8 c)
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560 {
191
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561 #if CYGNUM_HAL_DEBUG_GDB_PROTOCOL_RETRIES != 0
179
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562 int tries = CYGNUM_HAL_DEBUG_GDB_PROTOCOL_RETRIES;
191
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563 #endif
151
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564
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565 // No need to send CRs
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566 if( c == '\r' ) return;
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567
161
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568 CYGARC_HAL_SAVE_GP();
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569
208
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570 __mangler_line[__mangler_pos++] = c;
179
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571
208
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572 if( c == '\n' || __mangler_pos == sizeof(__mangler_line) )
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573 cyg_hal_diag_mangler_gdb_flush(__ch_data);
151
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574
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575 CYGARC_HAL_RESTORE_GP();
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576 }
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577
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578 static void
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579 cyg_hal_diag_mangler_gdb_write(void* __ch_data,
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580 const cyg_uint8* __buf, cyg_uint32 __len)
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581 {
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582 CYGARC_HAL_SAVE_GP();
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583
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584 while(__len-- > 0)
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585 cyg_hal_diag_mangler_gdb_putc(__ch_data, *__buf++);
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586
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587 CYGARC_HAL_RESTORE_GP();
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588 }
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589
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590 static void
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591 cyg_hal_diag_mangler_gdb_read(void* __ch_data,
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592 cyg_uint8* __buf, cyg_uint32 __len)
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593 {
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594 CYGARC_HAL_SAVE_GP();
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595
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596 while(__len-- > 0)
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597 *__buf++ = cyg_hal_diag_mangler_gdb_getc(__ch_data);
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598
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599 CYGARC_HAL_RESTORE_GP();
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600 }
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601
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602 static int
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603 cyg_hal_diag_mangler_gdb_control(void *__ch_data,
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604 __comm_control_cmd_t __func, ...)
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605 {
208
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606 CYGARC_HAL_SAVE_GP();
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607
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608 if (__func == __COMMCTL_FLUSH_OUTPUT)
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609 cyg_hal_diag_mangler_gdb_flush(__ch_data);
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610
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611 CYGARC_HAL_RESTORE_GP();
151
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612 return 0;
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613 }
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614
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615 // This is the COMMS init function. It gets called both by the stubs
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616 // and diag init code to initialize the COMMS mangler channel table -
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617 // that's all. The callers have to decide whether to actually use this
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618 // channel.
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619 void
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620 cyg_hal_diag_mangler_gdb_init(void)
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621 {
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622 hal_virtual_comm_table_t* comm;
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623 int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
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624
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625 // Initialize mangler procs
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626 CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_MANGLER);
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627 comm = CYGACC_CALL_IF_CONSOLE_PROCS();
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628 CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_diag_mangler_gdb_write);
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629 CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_diag_mangler_gdb_read);
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630 CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_diag_mangler_gdb_putc);
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631 CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_diag_mangler_gdb_getc);
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632 CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_diag_mangler_gdb_control);
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633
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634 // Restore the original console channel.
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635 CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);
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636 }
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637
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638 //-----------------------------------------------------------------------------
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639 // Null console output mangler
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640 // COMMS init function at end.
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641
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642 // This gets called via the virtual vector console comms entry and
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643 // just forwards IO to the debug comms entries.
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644 // This differs from setting the console channel to the same as the
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645 // debug channel in that console output will go to the debug channel
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646 // even if the debug channel is changed.
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647 static cyg_uint8
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648 cyg_hal_diag_mangler_null_getc(void* __ch_data)
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649 {
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650 cyg_uint8 __ch;
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651 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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652 CYGARC_HAL_SAVE_GP();
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653
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654 __ch = CYGACC_COMM_IF_GETC(*__chan);
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655
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656 CYGARC_HAL_RESTORE_GP();
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657
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658 return __ch;
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659 }
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660
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661
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662 static void
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663 cyg_hal_diag_mangler_null_putc(void* __ch_data, cyg_uint8 c)
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664 {
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665 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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666
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667 CYGARC_HAL_SAVE_GP();
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668
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669 CYGACC_COMM_IF_PUTC(*__chan, c);
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670
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671 CYGARC_HAL_RESTORE_GP();
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672 }
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673
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674 static void
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675 cyg_hal_diag_mangler_null_write(void* __ch_data,
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676 const cyg_uint8* __buf, cyg_uint32 __len)
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677 {
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678 CYGARC_HAL_SAVE_GP();
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679
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680 while(__len-- > 0)
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681 cyg_hal_diag_mangler_null_putc(__ch_data, *__buf++);
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682
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683 CYGARC_HAL_RESTORE_GP();
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684 }
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685
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686 static void
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687 cyg_hal_diag_mangler_null_read(void* __ch_data,
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688 cyg_uint8* __buf, cyg_uint32 __len)
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689 {
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diff changeset
690 CYGARC_HAL_SAVE_GP();
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diff changeset
691
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diff changeset
692 while(__len-- > 0)
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693 *__buf++ = cyg_hal_diag_mangler_null_getc(__ch_data);
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diff changeset
694
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diff changeset
695 CYGARC_HAL_RESTORE_GP();
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696 }
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697
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diff changeset
698 static int
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diff changeset
699 cyg_hal_diag_mangler_null_control(void *__ch_data,
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diff changeset
700 __comm_control_cmd_t __func, ...)
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diff changeset
701 {
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diff changeset
702 // Do nothing (yet).
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diff changeset
703 return 0;
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diff changeset
704 }
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705
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diff changeset
706 // This is the COMMS init function. It gets called both by the stubs
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707 // and diag init code to initialize the COMMS mangler channel table -
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diff changeset
708 // that's all. The callers have to decide whether to actually use this
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diff changeset
709 // channel.
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710 void
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diff changeset
711 cyg_hal_diag_mangler_null_init(void)
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712 {
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713 hal_virtual_comm_table_t* comm;
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diff changeset
714 int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
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715
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716 // Initialize mangler procs
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717 CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_MANGLER);
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718 comm = CYGACC_CALL_IF_CONSOLE_PROCS();
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719 CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_diag_mangler_null_write);
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720 CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_diag_mangler_null_read);
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diff changeset
721 CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_diag_mangler_null_putc);
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722 CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_diag_mangler_null_getc);
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723 CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_diag_mangler_null_control);
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diff changeset
724
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725 // Restore the original console channel.
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diff changeset
726 CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);
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727 }
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diff changeset
728
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diff changeset
729 //-----------------------------------------------------------------------------
101
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730 // Console IO functions that adhere to the virtual vector table semantics in
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diff changeset
731 // order to ensure proper debug agent mangling when required.
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732 //
115
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diff changeset
733 externC void cyg_hal_plf_comms_init(void);
151
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734
105
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735 void
101
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736 hal_if_diag_init(void)
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737 {
156
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738 // This function may be called from various places and the code
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739 // should only run once.
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740 static cyg_uint8 called = 0;
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741 if (called) return;
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742 called = 1;
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743
151
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744 #ifndef CYGSEM_HAL_VIRTUAL_VECTOR_INHERIT_CONSOLE
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745
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746 #if defined(CYGDBG_HAL_DIAG_TO_DEBUG_CHAN)
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747 // Use the mangler channel, which in turn uses the debug channel.
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748 CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_MANGLER);
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749
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750 // Initialize the mangler channel.
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751 #if defined(CYGSEM_HAL_DIAG_MANGLER_GDB)
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752 cyg_hal_diag_mangler_gdb_init();
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753 #elif defined(CYGSEM_HAL_DIAG_MANGLER_None)
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754 cyg_hal_diag_mangler_null_init();
103
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755 #endif
101
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756
151
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757 #else // CYGDBG_HAL_DIAG_TO_DEBUG_CHAN
103
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758
151
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759 // Use an actual (raw) IO channel
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760 CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL);
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761
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762 #endif // CYGDBG_HAL_DIAG_TO_DEBUG_CHAN
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763
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764 #endif // CYGSEM_HAL_VIRTUAL_VECTOR_INHERIT_CONSOLE
101
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765 }
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766
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767 void
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768 hal_if_diag_write_char(char c)
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769 {
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770 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
179
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771
101
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772 if (__chan)
107
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773 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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774 else {
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775 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
151
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776
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777 // FIXME: What should be done if assertions are not enabled?
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778 // This is a bad bad situation - we have no means for diag
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779 // output; we want to hit a breakpoint to alert the developer
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780 // or something like that.
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781 CYG_ASSERT(__chan, "No valid channel set");
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782
107
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783 CYGACC_COMM_IF_PUTC(*__chan, c);
101
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784 }
105
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785
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786 // Check interrupt flag
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787 if (CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG()) {
136
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788 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
105
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789 cyg_hal_user_break(0);
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790 }
101
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791 }
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diff changeset
792
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793 void
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794 hal_if_diag_read_char(char *c)
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795 {
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796 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_CONSOLE_PROCS();
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797
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798 if (__chan)
107
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799 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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800 else {
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801 __chan = CYGACC_CALL_IF_DEBUG_PROCS();
151
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802
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803 // FIXME: What should be done if assertions are not enabled?
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804 // This is a bad bad situation - we have no means for diag
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805 // output; we want to hit a breakpoint to alert the developer
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806 // or something like that.
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807 CYG_ASSERT(__chan, "No valid channel set");
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808
107
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809 *c = CYGACC_COMM_IF_GETC(*__chan);
101
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810 }
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811 }
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812 #endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG
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813
105
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814 //=============================================================================
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815 // CtrlC support
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816 //=============================================================================
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817
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818 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT) \
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819 || defined(CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT)
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820
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821 struct Hal_SavedRegisters *hal_saved_interrupt_state;
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822
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823 void
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824 hal_ctrlc_isr_init(void)
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825 {
110
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826 // A ROM monitor never enables the interrupt itself. This is left
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827 // to the (RAM) application.
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828 #ifndef CYGSEM_HAL_ROM_MONITOR
105
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829 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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830
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831 #if 1 // Prevents crash on older stubs
151
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832 int v_m;
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diff changeset
833 // Allow only ctrl-c interrupt enabling when version in table is
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834 // below legal max and above the necessary service, and _not_
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835 // the value we set it to below.
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836 v_m = CYGACC_CALL_IF_VERSION() & CYGNUM_CALL_IF_TABLE_VERSION_CALL_MASK;
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837 if (v_m >= CYGNUM_CALL_IF_TABLE_VERSION_CALL_MAX
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838 || v_m < CYGNUM_CALL_IF_SET_DEBUG_COMM
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839 || v_m == CYGNUM_CALL_IF_TABLE_VERSION_CALL_HACK)
105
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840 return;
110
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841
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diff changeset
842 // Now trash that value - otherwise downloading an image with
151
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843 // builtin stubs on a board with older stubs (which will cause the
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844 // version to be set to VERSION_CALL) may cause all subsequent
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845 // runs to (wrongly) fall through to the below code. If there is
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846 // a new stub on the board, it will reinitialize the version field
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847 // on reset. Yes, this is a gross hack!
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848 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION_CALL_HACK);
105
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849 #endif
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850
151
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851 // We can only enable interrupts on a valid debug channel.
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852 if (__chan)
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853 CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_IRQ_ENABLE);
110
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854 #endif
105
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855 }
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856
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857 cyg_uint32
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858 hal_ctrlc_isr(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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859 {
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860 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
151
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861 int isr_ret = 0, ctrlc = 0;
105
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862
151
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863 if (__chan) {
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864 isr_ret = CYGACC_COMM_IF_DBG_ISR(*__chan, &ctrlc, vector, data);
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865 if (ctrlc)
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866 cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state );
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867 }
105
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868 return isr_ret;
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869 }
119
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870
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871 cyg_bool
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872 hal_ctrlc_check(CYG_ADDRWORD vector, CYG_ADDRWORD data)
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873 {
151
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874 hal_virtual_comm_table_t* __chan = CYGACC_CALL_IF_DEBUG_PROCS();
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875 int gdb_vector = vector-1;
119
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876 int isr_ret, ctrlc = 0;
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877
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878 // This check only to avoid crash on older stubs in case of unhandled
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879 // interrupts. It is a bit messy, but required in a transition period.
151
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880 if (__chan &&
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881 (CYGNUM_CALL_IF_TABLE_VERSION_CALL_HACK ==
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882 (CYGACC_CALL_IF_VERSION() & CYGNUM_CALL_IF_TABLE_VERSION_CALL_MASK))){
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883 gdb_vector = CYGACC_COMM_IF_CONTROL(*__chan, __COMMCTL_DBG_ISR_VECTOR);
119
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884 }
145
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885 if (vector == gdb_vector) {
151
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886 isr_ret = CYGACC_COMM_IF_DBG_ISR(*__chan, &ctrlc, vector, data);
159
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887 if (ctrlc) {
119
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888 cyg_hal_user_break( (CYG_ADDRWORD *)hal_saved_interrupt_state );
159
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889 return true;
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890 }
119
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891 }
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892 return false;
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893 }
105
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894 #endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT || CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT
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895
101
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896 //--------------------------------------------------------------------------
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897 // Init function. It should be called from the platform initialization code.
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898 // For monitor configurations it will initialize the calling interface table,
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899 // for client configurations it will patch the existing table as per
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900 // configuration.
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901 void
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902 hal_if_init(void)
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903 {
156
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904 //**********************************************************************
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905 //
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906 // Note that if your RAM application is configured to initialize
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907 // the whole table _or_ the communication channels, you _cannot_
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908 // step through this function with the debugger. If your channel
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909 // configurations are set to the default, you should be able to
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910 // simply step over this function though (or use 'finish' once you
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diff changeset
911 // have entered this function if that GDB command works).
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912 //
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913 // If you really do need to debug this code, the best approach is
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914 // to have a working RedBoot / GDB stub in ROM and then change the
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915 // hal_virtual_vector_table to reside at some other address in the
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916 // RAM configuration than that used by the ROM monitor. Then
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917 // you'll be able to use the ROM monitor to debug the below code
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918 // and check that it does the right thing.
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919 //
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920 // Note that if you have a ROM monitor in ROM/flash which does
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921 // support virtual vectors, you should be able to disable the
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922 // option CYGSEM_HAL_VIRTUAL_VECTOR_INIT_WHOLE_TABLE. On some
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923 // targets (which predate the introduction of virtual vectors)
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924 // that option is enabled per default and needs to be explicitly
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925 // disabled when you have an updated ROM monitor.
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926 //
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927 //**********************************************************************
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928
151
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929 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_INIT_WHOLE_TABLE
101
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930 {
151
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931 int i;
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932
101
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933 // Initialize tables with the NOP service.
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934 // This should only be done for service routine entries - data
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935 // pointers should be NULLed.
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936 for (i = 0; i < CYGNUM_CALL_IF_TABLE_SIZE; i++)
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937 hal_virtual_vector_table[i] = (CYG_ADDRWORD) &nop_service;
151
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938
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939 // Version number
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940 CYGACC_CALL_IF_VERSION_SET(CYGNUM_CALL_IF_TABLE_VERSION_CALL
156
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941 |((CYG_ADDRWORD)CYGNUM_CALL_IF_TABLE_VERSION_COMM<<CYGNUM_CALL_IF_TABLE_VERSION_COMM_shift));
151
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942 }
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943 #endif
101
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944
151
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945 // Miscellaneous services with wrappers in this file.
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946 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_RESET
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947 CYGACC_CALL_IF_RESET_SET(reset);
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948 CYGACC_CALL_IF_KILL_VECTOR_SET(kill_by_reset);
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949 #endif
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950 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_DELAY_US
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951 CYGACC_CALL_IF_DELAY_US_SET(delay_us);
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952 #endif
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953
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954 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_CACHE
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955 // Cache functions
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956 CYGACC_CALL_IF_FLUSH_ICACHE_SET(flush_icache);
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957 CYGACC_CALL_IF_FLUSH_DCACHE_SET(flush_dcache);
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958 #endif
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959
156
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960 #ifdef CYGSEM_REDBOOT_FLASH_CONFIG
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961 CYGACC_CALL_IF_FLASH_CFG_OP_SET(flash_config_op);
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962 #endif
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963
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964 #ifdef CYGOPT_REDBOOT_FIS
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965 CYGACC_CALL_IF_FLASH_FIS_OP_SET(flash_fis_op);
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966 #endif
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967
151
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968 // Data entries not currently supported in eCos
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969 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_DATA
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970 CYGACC_CALL_IF_DBG_DATA_SET(0);
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971 #endif
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972
447
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973 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_VERSION
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974 CYGACC_CALL_IF_MONITOR_VERSION_SET(0);
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975 #endif
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976
151
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977 // Comm controls
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978 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_CLAIM_COMMS
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979 {
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980 int i, j;
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981
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982 // Clear out tables with safe dummy function.
112
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983 for (j = 0; j < CYGNUM_HAL_VIRTUAL_VECTOR_NUM_CHANNELS+1; j++)
101
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984 for (i = 0; i < CYGNUM_COMM_IF_TABLE_SIZE; i++)
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985 comm_channels[j][i] = (CYG_ADDRWORD) &nop_service;
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986
151
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987 // Set accessor functions
101
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988 CYGACC_CALL_IF_SET_DEBUG_COMM_SET(set_debug_comm);
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989 CYGACC_CALL_IF_SET_CONSOLE_COMM_SET(set_console_comm);
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990
151
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991 // Initialize console/debug procs. Note that these _must_
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992 // be set to empty before the comms init call.
105
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993 set_debug_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
103
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994 set_console_comm(CYGNUM_CALL_IF_SET_COMM_ID_EMPTY);
101
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995
151
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996 // Initialize channels. This used to be done in
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997 // hal_diag_init() and the stub initHardware() functions, but
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998 // it makes more sense to have here.
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999 cyg_hal_plf_comms_init();
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1000
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1001 // Always set the debug channel. If stubs are included, it is
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1002 // necessary. If no stubs are included it does not hurt and is
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1003 // likely to be required by the hal_if_diag_init code anyway
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1004 // as it may rely on it if using a mangler.
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1005 set_debug_comm(CYGNUM_HAL_VIRTUAL_VECTOR_DEBUG_CHANNEL);
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1006 // Set console channel to a safe default. hal_if_diag_init
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1007 // will override with console channel or mangler if necessary.
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1008 set_console_comm(CYGNUM_HAL_VIRTUAL_VECTOR_DEBUG_CHANNEL);
101
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1009 }
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1010
105
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1011 // Reset console interrupt flag.
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1012 CYGACC_CALL_IF_CONSOLE_INTERRUPT_FLAG_SET(0);
151
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1013 #endif
105
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1014
101
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1015 // Set up services provided by clients
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1016 #if defined(CYGFUN_HAL_COMMON_KERNEL_SUPPORT) && \
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1017 ( defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs) \
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1018 || defined(CYGSEM_HAL_USE_ROM_MONITOR_CygMon))
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1019
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1020 patch_dbg_syscalls( (void *)(hal_virtual_vector_table) );
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1021 #endif
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1022
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1023 // Init client services
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1024 #if !defined(CYGPKG_KERNEL) && defined(CYGDBG_HAL_DEBUG_GDB_THREAD_SUPPORT)
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1025 // Only include this code if we do not have a kernel. Otherwise
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1026 // the kernel supplies the functionality for the app we are linked
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1027 // with.
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1028
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1029 // Prepare for application installation of thread info function in
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1030 // vector table.
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1031 init_thread_syscall( (void *)&hal_virtual_vector_table[CYGNUM_CALL_IF_DBG_SYSCALL] );
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1032 #endif
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1033
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1034 // Finally, install async breakpoint handler if it is configured in.
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1035 // FIXME: this should probably check for STUBS instead (but code is
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1036 // conditional on BREAK for now)
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1037 #if defined(CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT)
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1038 // Install async breakpoint handler into vector table.
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1039 CYGACC_CALL_IF_INSTALL_BPT_FN_SET(&cyg_hal_gdb_interrupt);
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1040 #endif
156
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1041
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1042 #if 0 != CYGINT_HAL_PLF_IF_INIT
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1043 // Call platform specific initializations - should only be used
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1044 // to augment what has already been set up, etc.
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1045 plf_if_init();
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1046 #endif
101
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1047 }
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1048