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annotate packages/hal/synth/arch/current/src/synth_entry.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
parents ac086aa3217e
children d2c90368aeef
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1 //==========================================================================
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2 //
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3 // synth_entry.c
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4 //
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5 // Entry code for Linux synthetic target.
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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 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): proven
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44 // Contributors:proven, jskov, bartv
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45 // Date: 1999-01-06
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46 // Purpose: Entry point for Linux synthetic target.
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //=========================================================================
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51
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52 #include <pkgconf/system.h>
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53 #include <pkgconf/hal.h>
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54 #include <cyg/infra/cyg_type.h>
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55 #include <cyg/infra/cyg_ass.h>
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56 #include <cyg/hal/hal_arch.h>
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57 #include <cyg/hal/hal_intr.h>
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58 #include <cyg/hal/hal_io.h>
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59 #include CYGHWR_MEMORY_LAYOUT_H
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60
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61 /*------------------------------------------------------------------------*/
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62 /* C++ support - run initial constructors */
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63
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64 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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65 cyg_bool cyg_hal_stop_constructors;
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66 #endif
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67
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68 typedef void (*pfunc) (void);
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69 extern pfunc __CTOR_LIST__[];
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70 extern pfunc __CTOR_END__[];
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71
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72 void
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73 cyg_hal_invoke_constructors (void)
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74 {
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75 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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76 static pfunc *p = &__CTOR_END__[-1];
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77
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78 cyg_hal_stop_constructors = 0;
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79 for (; p >= __CTOR_LIST__; p--) {
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80 (*p) ();
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81 if (cyg_hal_stop_constructors) {
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82 p--;
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83 break;
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84 }
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85 }
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86 #else
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87 pfunc *p;
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88
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89 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
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90 (*p) ();
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91 #endif
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92 }
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93
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94 // ----------------------------------------------------------------------------
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95 // The low-level entry point is platform-specific, typically in the
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96 // assember file vectors.S. However that entry point simply jumps
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97 // directly here, with no further processing or stack manipulation.
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98 // The HAL specification defines clearly what should happen during
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99 // startup.
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100
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101 externC void cyg_start( void );
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102
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103 void _linux_entry( void )
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104 {
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105 void* new_top = (void*) 0;
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106
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107 // "Initialize various cpu status registers, including disabling interrupts."
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108 // That is a no-op for the synthetic target, in particular interrupts are
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109 // already disabled.
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110
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111 // "Set up any CPU memory controller to access ROM, RAM, and I/O devices
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112 // correctly".
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113 //
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114 // This involves using the brk() system call to allocate the RAM used
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115 // for the heaps. There are no variables mapped there so the system
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116 // will not have done this for us. Note that the implementation of
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117 // brk() (mm/mmap.c) differs from the documentation - the return
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118 // value is the new brk value, not an error code.
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119 new_top = (void*) (CYGMEM_REGION_ram + CYGMEM_REGION_ram_SIZE);
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120 if (new_top != cyg_hal_sys_brk(new_top)) {
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121 CYG_FAIL("Failed to initialize memory");
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122 cyg_hal_sys_exit(1);
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123 }
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124
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125 // Again a no-op for the synthetic target. All memory is readily
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126 // accessible. Arguably the auxiliary should be started up here, but
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127 // instead that is left to platform initialization.
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128
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129 // "Enable the cache". Effectively the synthetic target has no cache,
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130 // anything provided by the hardware is not readily accessible.
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131
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132 // "Set up the stack pointer". The system starts up a program with a
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133 // suitable stack.
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134
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135 // "Initialize any global pointer register". There is no such register.
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136
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137 // Perform platform-specific initialization. Actually, all Linux
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138 // platforms can share this. It involves setting up signal handlers
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139 // and so on.
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140 hal_synthetic_target_init();
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141
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142 // This is not a ROM startup, so no need to worry about copying the
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143 // .data section.
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144
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145 // "Zero the .bss section". Linux will have done this for us.
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146
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147 // "Create a suitable C stack frame". Already done.
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148
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149 // Invoke the C++ constructors.
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150 cyg_hal_invoke_constructors();
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151
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152 // "Call cyg_start()". OK.
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153 cyg_start();
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154
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155 // "Drop into an infinite loop". Not a good idea for the synthetic
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156 // target. Instead, exit.
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157 cyg_hal_sys_exit(0);
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158 }
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159
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160 //-----------------------------------------------------------------------------
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161 // End of entry.c