1 | /* |
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2 | * Intel i386 Dependent Source |
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3 | * |
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4 | * |
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5 | * COPYRIGHT (c) 1989-1999. |
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6 | * On-Line Applications Research Corporation (OAR). |
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7 | * |
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8 | * The license and distribution terms for this file may be |
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9 | * found in the file LICENSE in this distribution or at |
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10 | * http://www.rtems.com/license/LICENSE. |
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11 | * |
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12 | * $Id$ |
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13 | */ |
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14 | |
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15 | #include <rtems.h> |
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16 | #include <rtems/system.h> |
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17 | #include <rtems/score/types.h> |
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18 | #include <rtems/score/isr.h> |
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19 | #include <rtems/score/idtr.h> |
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20 | |
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21 | #include <rtems/bspIo.h> |
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22 | #include <rtems/score/thread.h> |
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23 | |
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24 | /* _CPU_Initialize |
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25 | * |
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26 | * This routine performs processor dependent initialization. |
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27 | * |
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28 | * INPUT PARAMETERS: |
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29 | * cpu_table - CPU table to initialize |
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30 | * thread_dispatch - address of disptaching routine |
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31 | */ |
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32 | |
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33 | |
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34 | void _CPU_Initialize( |
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35 | rtems_cpu_table *cpu_table, |
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36 | void (*thread_dispatch) /* ignored on this CPU */ |
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37 | ) |
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38 | { |
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39 | #if CPU_HARDWARE_FP |
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40 | register uint16_t fp_status asm ("ax"); |
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41 | register void *fp_context; |
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42 | #endif |
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43 | |
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44 | _CPU_Table = *cpu_table; |
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45 | |
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46 | /* |
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47 | * The following code saves a NULL i387 context which is given |
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48 | * to each task at start and restart time. The following code |
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49 | * is based upon that provided in the i386 Programmer's |
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50 | * Manual and should work on any coprocessor greater than |
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51 | * the i80287. |
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52 | * |
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53 | * NOTE: The NO WAIT form of the coprocessor instructions |
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54 | * MUST be used in case there is not a coprocessor |
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55 | * to wait for. |
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56 | */ |
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57 | |
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58 | #if CPU_HARDWARE_FP |
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59 | fp_status = 0xa5a5; |
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60 | asm volatile( "fninit" ); |
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61 | asm volatile( "fnstsw %0" : "=a" (fp_status) : "0" (fp_status) ); |
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62 | |
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63 | if ( fp_status == 0 ) { |
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64 | |
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65 | fp_context = &_CPU_Null_fp_context; |
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66 | |
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67 | asm volatile( "fsave (%0)" : "=r" (fp_context) |
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68 | : "0" (fp_context) |
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69 | ); |
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70 | } |
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71 | #endif |
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72 | |
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73 | } |
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74 | |
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75 | /*PAGE |
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76 | * |
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77 | * _CPU_ISR_Get_level |
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78 | */ |
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79 | |
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80 | uint32_t _CPU_ISR_Get_level( void ) |
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81 | { |
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82 | uint32_t level; |
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83 | |
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84 | i386_get_interrupt_level( level ); |
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85 | |
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86 | return level; |
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87 | } |
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88 | |
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89 | void _CPU_Thread_Idle_body () |
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90 | { |
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91 | while(1){ |
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92 | asm volatile ("hlt"); |
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93 | } |
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94 | } |
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95 | |
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96 | void _defaultExcHandler (CPU_Exception_frame *ctx) |
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97 | { |
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98 | unsigned int faultAddr = 0; |
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99 | printk("----------------------------------------------------------\n"); |
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100 | printk("Exception %d caught at PC %x by thread %d\n", |
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101 | ctx->idtIndex, |
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102 | ctx->eip, |
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103 | _Thread_Executing->Object.id); |
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104 | printk("----------------------------------------------------------\n"); |
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105 | printk("Processor execution context at time of the fault was :\n"); |
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106 | printk("----------------------------------------------------------\n"); |
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107 | printk(" EAX = %x EBX = %x ECX = %x EDX = %x\n", |
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108 | ctx->eax, ctx->ebx, ctx->ecx, ctx->edx); |
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109 | printk(" ESI = %x EDI = %x EBP = %x ESP = %x\n", |
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110 | ctx->esi, ctx->edi, ctx->ebp, ctx->esp0); |
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111 | printk("----------------------------------------------------------\n"); |
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112 | printk("Error code pushed by processor itself (if not 0) = %x\n", |
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113 | ctx->faultCode); |
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114 | printk("----------------------------------------------------------\n"); |
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115 | if (ctx->idtIndex == I386_EXCEPTION_PAGE_FAULT){ |
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116 | faultAddr = i386_get_cr2(); |
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117 | printk("Page fault linear address (CR2) = %x\n", faultAddr); |
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118 | printk("----------------------------------------------------------\n\n"); |
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119 | } |
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120 | if (_ISR_Nest_level > 0) { |
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121 | /* |
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122 | * In this case we shall not delete the task interrupted as |
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123 | * it has nothing to do with the fault. We cannot return either |
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124 | * because the eip points to the faulty instruction so... |
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125 | */ |
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126 | printk("Exception while executing ISR!!!. System locked\n"); |
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127 | _CPU_Fatal_halt(faultAddr); |
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128 | } |
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129 | else { |
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130 | /* |
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131 | * OK I could probably use a simplified version but at least this |
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132 | * should work. |
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133 | */ |
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134 | printk(" ************ FAULTY THREAD WILL BE DELETED **************\n"); |
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135 | rtems_task_delete(_Thread_Executing->Object.id); |
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136 | } |
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137 | } |
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138 | |
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139 | cpuExcHandlerType _currentExcHandler = _defaultExcHandler; |
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140 | |
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141 | extern void rtems_exception_prologue_0(); |
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142 | extern void rtems_exception_prologue_1(); |
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143 | extern void rtems_exception_prologue_2(); |
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144 | extern void rtems_exception_prologue_3(); |
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145 | extern void rtems_exception_prologue_4(); |
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146 | extern void rtems_exception_prologue_5(); |
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147 | extern void rtems_exception_prologue_6(); |
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148 | extern void rtems_exception_prologue_7(); |
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149 | extern void rtems_exception_prologue_8(); |
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150 | extern void rtems_exception_prologue_9(); |
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151 | extern void rtems_exception_prologue_10(); |
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152 | extern void rtems_exception_prologue_11(); |
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153 | extern void rtems_exception_prologue_12(); |
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154 | extern void rtems_exception_prologue_13(); |
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155 | extern void rtems_exception_prologue_14(); |
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156 | extern void rtems_exception_prologue_16(); |
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157 | extern void rtems_exception_prologue_17(); |
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158 | extern void rtems_exception_prologue_18(); |
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159 | |
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160 | static rtems_raw_irq_hdl tbl[] = { |
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161 | rtems_exception_prologue_0, |
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162 | rtems_exception_prologue_1, |
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163 | rtems_exception_prologue_2, |
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164 | rtems_exception_prologue_3, |
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165 | rtems_exception_prologue_4, |
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166 | rtems_exception_prologue_5, |
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167 | rtems_exception_prologue_6, |
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168 | rtems_exception_prologue_7, |
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169 | rtems_exception_prologue_8, |
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170 | rtems_exception_prologue_9, |
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171 | rtems_exception_prologue_10, |
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172 | rtems_exception_prologue_11, |
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173 | rtems_exception_prologue_12, |
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174 | rtems_exception_prologue_13, |
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175 | rtems_exception_prologue_14, |
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176 | rtems_exception_prologue_16, |
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177 | rtems_exception_prologue_17, |
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178 | rtems_exception_prologue_18, |
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179 | }; |
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180 | |
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181 | void rtems_exception_init_mngt() |
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182 | { |
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183 | unsigned int i,j; |
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184 | interrupt_gate_descriptor *currentIdtEntry; |
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185 | unsigned limit; |
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186 | unsigned level; |
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187 | |
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188 | i = sizeof(tbl) / sizeof (rtems_raw_irq_hdl); |
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189 | |
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190 | i386_get_info_from_IDTR (¤tIdtEntry, &limit); |
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191 | |
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192 | _CPU_ISR_Disable(level); |
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193 | for (j = 0; j < i; j++) { |
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194 | create_interrupt_gate_descriptor (¤tIdtEntry[j], tbl[j]); |
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195 | } |
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196 | _CPU_ISR_Enable(level); |
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197 | } |
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198 | |
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