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annotate packages/hal/synth/arch/current/src/synth_entry.c @ 161:ac086aa3217e

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Merge from eCos master repository on 2001-06-08-21:11:51-BST
author jlarmour
date Sun, 10 Jun 2001 19:35:23 +0000
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children e0c0827131d1
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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 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000, 2001 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): proven
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35 // Contributors:proven, jskov, bartv
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36 // Date: 1999-01-06
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37 // Purpose: Entry point for Linux synthetic target.
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38 //
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39 //####DESCRIPTIONEND####
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40 //
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41 //=========================================================================
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42
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43 #include <pkgconf/system.h>
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44 #include <pkgconf/hal.h>
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45 #include <cyg/infra/cyg_type.h>
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46 #include <cyg/infra/cyg_ass.h>
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47 #include <cyg/hal/hal_arch.h>
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48 #include <cyg/hal/hal_intr.h>
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49 #include <cyg/hal/hal_io.h>
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50 #include CYGHWR_MEMORY_LAYOUT_H
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51
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52 /*------------------------------------------------------------------------*/
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53 /* C++ support - run initial constructors */
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54
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55 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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56 cyg_bool cyg_hal_stop_constructors;
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57 #endif
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58
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59 typedef void (*pfunc) (void);
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60 extern pfunc __CTOR_LIST__[];
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61 extern pfunc __CTOR_END__[];
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62
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63 void
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64 cyg_hal_invoke_constructors (void)
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65 {
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66 #ifdef CYGSEM_HAL_STOP_CONSTRUCTORS_ON_FLAG
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67 static pfunc *p = &__CTOR_END__[-1];
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68
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69 cyg_hal_stop_constructors = 0;
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70 for (; p >= __CTOR_LIST__; p--) {
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71 (*p) ();
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72 if (cyg_hal_stop_constructors) {
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73 p--;
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74 break;
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75 }
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76 }
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77 #else
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78 pfunc *p;
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79
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80 for (p = &__CTOR_END__[-1]; p >= __CTOR_LIST__; p--)
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81 (*p) ();
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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 // The low-level entry point is platform-specific, typically in the
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87 // assember file vectors.S. However that entry point simply jumps
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88 // directly here, with no further processing or stack manipulation.
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89 // The HAL specification defines clearly what should happen during
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90 // startup.
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91
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92 externC void cyg_start( void );
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93
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94 void _linux_entry( void )
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95 {
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96 void* new_top = (void*) 0;
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97
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98 // "Initialize various cpu status registers, including disabling interrupts."
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99 // That is a no-op for the synthetic target, in particular interrupts are
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100 // already disabled.
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101
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102 // "Set up any CPU memory controller to access ROM, RAM, and I/O devices
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103 // correctly".
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104 //
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105 // This involves using the brk() system call to allocate the RAM used
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106 // for the heaps. There are no variables mapped there so the system
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107 // will not have done this for us. Note that the implementation of
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108 // brk() (mm/mmap.c) differs from the documentation - the return
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109 // value is the new brk value, not an error code.
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110 new_top = (void*) (CYGMEM_REGION_ram + CYGMEM_REGION_ram_SIZE);
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111 if (new_top != cyg_hal_sys_brk(new_top)) {
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112 CYG_FAIL("Failed to initialize memory");
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113 cyg_hal_sys_exit(1);
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114 }
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115
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116 // Again a no-op for the synthetic target. All memory is readily
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117 // accessible. Arguably the auxiliary should be started up here, but
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118 // instead that is left to platform initialization.
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119
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120 // "Enable the cache". Effectively the synthetic target has no cache,
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121 // anything provided by the hardware is not readily accessible.
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122
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123 // "Set up the stack pointer". The system starts up a program with a
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124 // suitable stack.
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125
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126 // "Initialize any global pointer register". There is no such register.
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127
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128 // Perform platform-specific initialization. Actually, all Linux
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129 // platforms can share this. It involves setting up signal handlers
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130 // and so on.
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131 hal_synthetic_target_init();
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132
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133 // This is not a ROM startup, so no need to worry about copying the
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134 // .data section.
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135
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136 // "Zero the .bss section". Linux will have done this for us.
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137
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138 // "Create a suitable C stack frame". Already done.
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139
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140 // Invoke the C++ constructors.
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141 cyg_hal_invoke_constructors();
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142
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143 // "Call cyg_start()". OK.
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144 cyg_start();
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145
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146 // "Drop into an infinite loop". Not a good idea for the synthetic
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147 // target. Instead, exit.
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148 cyg_hal_sys_exit(0);
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149 }
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150
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151 //-----------------------------------------------------------------------------
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152 // End of entry.c