1 | /* cpu_asm.s |
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2 | * |
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3 | * This file contains all assembly code for the Intel i386 implementation |
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4 | * of RTEMS. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1997. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * Copyright assigned to U.S. Government, 1994. |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.OARcorp.com/rtems/license.html. |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | #include <asm.h> |
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18 | |
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19 | /* |
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20 | * Format of i386 Register structure |
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21 | */ |
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22 | |
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23 | .set REG_EFLAGS, 0 |
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24 | .set REG_ESP, REG_EFLAGS + 4 |
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25 | .set REG_EBP, REG_ESP + 4 |
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26 | .set REG_EBX, REG_EBP + 4 |
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27 | .set REG_ESI, REG_EBX + 4 |
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28 | .set REG_EDI, REG_ESI + 4 |
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29 | .set SIZE_REGS, REG_EDI + 4 |
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30 | |
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31 | BEGIN_CODE |
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32 | |
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33 | /* |
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34 | * void _CPU_Context_switch( run_context, heir_context ) |
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35 | * |
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36 | * This routine performs a normal non-FP context. |
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37 | */ |
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38 | |
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39 | .p2align 1 |
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40 | PUBLIC (_CPU_Context_switch) |
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41 | |
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42 | .set RUNCONTEXT_ARG, 4 # save context argument |
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43 | .set HEIRCONTEXT_ARG, 8 # restore context argument |
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44 | |
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45 | SYM (_CPU_Context_switch): |
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46 | movl RUNCONTEXT_ARG(esp),eax # eax = running threads context |
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47 | pushf # push eflags |
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48 | popl REG_EFLAGS(eax) # save eflags |
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49 | movl esp,REG_ESP(eax) # save stack pointer |
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50 | movl ebp,REG_EBP(eax) # save base pointer |
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51 | movl ebx,REG_EBX(eax) # save ebx |
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52 | movl esi,REG_ESI(eax) # save source register |
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53 | movl edi,REG_EDI(eax) # save destination register |
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54 | |
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55 | movl HEIRCONTEXT_ARG(esp),eax # eax = heir threads context |
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56 | |
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57 | restore: |
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58 | pushl REG_EFLAGS(eax) # push eflags |
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59 | popf # restore eflags |
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60 | movl REG_ESP(eax),esp # restore stack pointer |
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61 | movl REG_EBP(eax),ebp # restore base pointer |
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62 | movl REG_EBX(eax),ebx # restore ebx |
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63 | movl REG_ESI(eax),esi # restore source register |
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64 | movl REG_EDI(eax),edi # restore destination register |
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65 | ret |
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66 | |
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67 | /* |
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68 | * NOTE: May be unnecessary to reload some registers. |
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69 | */ |
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70 | |
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71 | /* |
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72 | * void _CPU_Context_restore( new_context ) |
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73 | * |
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74 | * This routine performs a normal non-FP context. |
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75 | */ |
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76 | |
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77 | PUBLIC (_CPU_Context_restore) |
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78 | |
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79 | .set NEWCONTEXT_ARG, 4 # context to restore argument |
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80 | |
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81 | SYM (_CPU_Context_restore): |
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82 | |
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83 | movl NEWCONTEXT_ARG(esp),eax # eax = running threads context |
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84 | jmp restore |
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85 | |
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86 | /*PAGE |
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87 | * void _CPU_Context_save_fp_context( &fp_context_ptr ) |
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88 | * void _CPU_Context_restore_fp_context( &fp_context_ptr ) |
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89 | * |
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90 | * This section is used to context switch an i80287, i80387, |
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91 | * the built-in coprocessor or the i80486 or compatible. |
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92 | */ |
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93 | |
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94 | .set FPCONTEXT_ARG, 4 # FP context argument |
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95 | |
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96 | .p2align 1 |
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97 | PUBLIC (_CPU_Context_save_fp) |
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98 | SYM (_CPU_Context_save_fp): |
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99 | movl FPCONTEXT_ARG(esp),eax # eax = &ptr to FP context area |
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100 | movl (eax),eax # eax = FP context area |
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101 | fsave (eax) # save FP context |
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102 | ret |
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103 | |
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104 | .p2align 1 |
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105 | PUBLIC (_CPU_Context_restore_fp) |
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106 | SYM (_CPU_Context_restore_fp): |
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107 | movl FPCONTEXT_ARG(esp),eax # eax = &ptr to FP context area |
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108 | movl (eax),eax # eax = FP context area |
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109 | frstor (eax) # restore FP context |
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110 | ret |
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111 | |
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112 | /*PAGE |
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113 | * void _ISR_Handler() |
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114 | * |
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115 | * This routine provides the RTEMS interrupt management. |
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116 | * |
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117 | * NOTE: |
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118 | * Upon entry, the stack will contain a stack frame back to the |
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119 | * interrupted task. If dispatching is enabled, this is the |
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120 | * outer most interrupt, and (a context switch is necessary or |
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121 | * the current task has signals), then set up the stack to |
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122 | * transfer control to the interrupt dispatcher. |
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123 | */ |
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124 | |
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125 | .set SET_SEGMENT_REGISTERS_IN_INTERRUPT, 0 |
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126 | |
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127 | .set SAVED_REGS , 32 # space consumed by saved regs |
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128 | .set EIP_OFFSET , SAVED_REGS # offset of tasks eip |
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129 | .set CS_OFFSET , EIP_OFFSET+4 # offset of tasks code segment |
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130 | .set EFLAGS_OFFSET , CS_OFFSET+4 # offset of tasks eflags |
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131 | |
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132 | .p2align 1 |
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133 | PUBLIC (_ISR_Handler) |
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134 | |
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135 | SYM (_ISR_Handler): |
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136 | /* |
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137 | * Before this was point is reached the vectors unique |
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138 | * entry point did the following: |
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139 | * |
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140 | * 1. saved all registers with a "pusha" |
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141 | * 2. put the vector number in eax. |
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142 | * |
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143 | * BEGINNING OF ESTABLISH SEGMENTS |
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144 | * |
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145 | * WARNING: If an interrupt can occur when the segments are |
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146 | * not correct, then this is where we should establish |
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147 | * the segments. In addition to establishing the |
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148 | * segments, it may be necessary to establish a stack |
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149 | * in the current data area on the outermost interrupt. |
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150 | * |
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151 | * NOTE: If the previous values of the segment registers are |
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152 | * pushed, do not forget to adjust SAVED_REGS. |
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153 | * |
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154 | * NOTE: Make sure the exit code which restores these |
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155 | * when this type of code is needed. |
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156 | */ |
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157 | |
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158 | /***** ESTABLISH SEGMENTS CODE GOES HERE ******/ |
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159 | |
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160 | /* |
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161 | * END OF ESTABLISH SEGMENTS |
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162 | */ |
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163 | |
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164 | /* |
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165 | * Now switch stacks if necessary |
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166 | */ |
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167 | |
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168 | movl esp, edx # edx = previous stack pointer |
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169 | cmpl $0, SYM (_ISR_Nest_level) # is this the outermost interrupt? |
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170 | jne nested # No, then continue |
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171 | movl SYM (_CPU_Interrupt_stack_high), esp |
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172 | |
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173 | /* |
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174 | * We want to insure that the old stack pointer is on the |
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175 | * stack we will be on at the end of the ISR when we restore it. |
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176 | * By saving it on every interrupt, all we have to do is pop it |
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177 | * near the end of every interrupt. |
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178 | */ |
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179 | |
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180 | nested: |
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181 | pushl edx # save the previous stack pointer |
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182 | incl SYM (_ISR_Nest_level) # one nest level deeper |
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183 | incl SYM (_Thread_Dispatch_disable_level) # disable multitasking |
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184 | |
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185 | # EAX is preloaded with the vector number. |
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186 | push eax # push vector number |
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187 | mov SYM (_ISR_Vector_table) (,eax,4),eax |
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188 | # eax = Users handler |
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189 | call eax # invoke user ISR |
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190 | pop eax # eax = vector number |
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191 | |
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192 | decl SYM (_ISR_Nest_level) # one less ISR nest level |
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193 | # If interrupts are nested, |
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194 | # then dispatching is disabled |
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195 | |
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196 | decl SYM (_Thread_Dispatch_disable_level) |
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197 | # unnest multitasking |
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198 | # Is dispatch disabled |
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199 | jne exit # Yes, then exit |
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200 | |
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201 | cmpl $0, SYM (_Context_Switch_necessary) |
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202 | # Is task switch necessary? |
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203 | jne bframe # Yes, then build stack |
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204 | |
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205 | cmpl $0, SYM (_ISR_Signals_to_thread_executing) |
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206 | # signals sent to Run_thread |
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207 | # while in interrupt handler? |
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208 | je exit # No, exit |
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209 | |
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210 | bframe: |
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211 | cli # DISABLE INTERRUPTS!! |
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212 | popl esp # restore the stack pointer |
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213 | movl $0, SYM (_ISR_Signals_to_thread_executing) |
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214 | # push the isf for Isr_dispatch |
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215 | push EFLAGS_OFFSET(esp) # push tasks eflags |
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216 | push cs # cs of Isr_dispatch |
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217 | push $ SYM (_ISR_Dispatch) # entry point |
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218 | iret |
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219 | |
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220 | exit: |
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221 | cli # DISABLE INTERRUPTS!! |
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222 | popl esp # restore the stack pointer |
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223 | |
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224 | /* |
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225 | * BEGINNING OF DE-ESTABLISH SEGMENTS |
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226 | * |
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227 | * NOTE: Make sure there is code here if code is added to |
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228 | * load the segment registers. |
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229 | * |
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230 | */ |
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231 | |
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232 | /******* DE-ESTABLISH SEGMENTS CODE GOES HERE ********/ |
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233 | |
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234 | /* |
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235 | * END OF DE-ESTABLISH SEGMENTS |
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236 | */ |
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237 | |
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238 | popa # restore general registers |
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239 | iret |
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240 | |
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241 | /*PAGE |
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242 | * Distinct Interrupt Entry Points |
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243 | * |
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244 | * The following macro and the 256 instantiations of the macro |
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245 | * are necessary to determine which interrupt vector occurred. |
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246 | * The following macro allows a unique entry point to be defined |
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247 | * for each vector. |
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248 | * |
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249 | * NOTE: There are not spaces around the vector number argument |
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250 | * to the DISTINCT_INTERRUPT_ENTRY macro because m4 will |
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251 | * undesirably generate the symbol "_Isr_handler_ N" |
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252 | * instead of "_Isr_handler_N" like we want. |
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253 | */ |
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254 | |
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255 | #define DISTINCT_INTERRUPT_ENTRY(_vector) \ |
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256 | .p2align 4 ; \ |
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257 | PUBLIC (_ISR_Handler_ ## _vector ) ; \ |
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258 | SYM (_ISR_Handler_ ## _vector ): \ |
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259 | pusha ; \ |
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260 | xor eax, eax ; \ |
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261 | movb $ ## _vector, al ; \ |
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262 | jmp SYM (_ISR_Handler) ; |
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263 | |
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264 | DISTINCT_INTERRUPT_ENTRY(0) |
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265 | DISTINCT_INTERRUPT_ENTRY(1) |
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266 | DISTINCT_INTERRUPT_ENTRY(2) |
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267 | DISTINCT_INTERRUPT_ENTRY(3) |
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268 | DISTINCT_INTERRUPT_ENTRY(4) |
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269 | DISTINCT_INTERRUPT_ENTRY(5) |
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270 | DISTINCT_INTERRUPT_ENTRY(6) |
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271 | DISTINCT_INTERRUPT_ENTRY(7) |
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272 | DISTINCT_INTERRUPT_ENTRY(8) |
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273 | DISTINCT_INTERRUPT_ENTRY(9) |
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274 | DISTINCT_INTERRUPT_ENTRY(10) |
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275 | DISTINCT_INTERRUPT_ENTRY(11) |
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276 | DISTINCT_INTERRUPT_ENTRY(12) |
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277 | DISTINCT_INTERRUPT_ENTRY(13) |
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278 | DISTINCT_INTERRUPT_ENTRY(14) |
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279 | DISTINCT_INTERRUPT_ENTRY(15) |
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280 | DISTINCT_INTERRUPT_ENTRY(16) |
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281 | DISTINCT_INTERRUPT_ENTRY(17) |
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282 | DISTINCT_INTERRUPT_ENTRY(18) |
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283 | DISTINCT_INTERRUPT_ENTRY(19) |
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284 | DISTINCT_INTERRUPT_ENTRY(20) |
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285 | DISTINCT_INTERRUPT_ENTRY(21) |
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286 | DISTINCT_INTERRUPT_ENTRY(22) |
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287 | DISTINCT_INTERRUPT_ENTRY(23) |
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288 | DISTINCT_INTERRUPT_ENTRY(24) |
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289 | DISTINCT_INTERRUPT_ENTRY(25) |
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290 | DISTINCT_INTERRUPT_ENTRY(26) |
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291 | DISTINCT_INTERRUPT_ENTRY(27) |
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292 | DISTINCT_INTERRUPT_ENTRY(28) |
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293 | DISTINCT_INTERRUPT_ENTRY(29) |
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294 | DISTINCT_INTERRUPT_ENTRY(30) |
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295 | DISTINCT_INTERRUPT_ENTRY(31) |
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296 | DISTINCT_INTERRUPT_ENTRY(32) |
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297 | DISTINCT_INTERRUPT_ENTRY(33) |
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298 | DISTINCT_INTERRUPT_ENTRY(34) |
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299 | DISTINCT_INTERRUPT_ENTRY(35) |
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300 | DISTINCT_INTERRUPT_ENTRY(36) |
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301 | DISTINCT_INTERRUPT_ENTRY(37) |
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302 | DISTINCT_INTERRUPT_ENTRY(38) |
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303 | DISTINCT_INTERRUPT_ENTRY(39) |
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304 | DISTINCT_INTERRUPT_ENTRY(40) |
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305 | DISTINCT_INTERRUPT_ENTRY(41) |
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306 | DISTINCT_INTERRUPT_ENTRY(42) |
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307 | DISTINCT_INTERRUPT_ENTRY(43) |
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308 | DISTINCT_INTERRUPT_ENTRY(44) |
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309 | DISTINCT_INTERRUPT_ENTRY(45) |
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310 | DISTINCT_INTERRUPT_ENTRY(46) |
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311 | DISTINCT_INTERRUPT_ENTRY(47) |
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312 | DISTINCT_INTERRUPT_ENTRY(48) |
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313 | DISTINCT_INTERRUPT_ENTRY(49) |
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314 | DISTINCT_INTERRUPT_ENTRY(50) |
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315 | DISTINCT_INTERRUPT_ENTRY(51) |
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316 | DISTINCT_INTERRUPT_ENTRY(52) |
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317 | DISTINCT_INTERRUPT_ENTRY(53) |
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318 | DISTINCT_INTERRUPT_ENTRY(54) |
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319 | DISTINCT_INTERRUPT_ENTRY(55) |
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320 | DISTINCT_INTERRUPT_ENTRY(56) |
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321 | DISTINCT_INTERRUPT_ENTRY(57) |
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322 | DISTINCT_INTERRUPT_ENTRY(58) |
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323 | DISTINCT_INTERRUPT_ENTRY(59) |
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324 | DISTINCT_INTERRUPT_ENTRY(60) |
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325 | DISTINCT_INTERRUPT_ENTRY(61) |
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326 | DISTINCT_INTERRUPT_ENTRY(62) |
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327 | DISTINCT_INTERRUPT_ENTRY(63) |
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328 | DISTINCT_INTERRUPT_ENTRY(64) |
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329 | DISTINCT_INTERRUPT_ENTRY(65) |
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330 | DISTINCT_INTERRUPT_ENTRY(66) |
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331 | DISTINCT_INTERRUPT_ENTRY(67) |
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332 | DISTINCT_INTERRUPT_ENTRY(68) |
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333 | DISTINCT_INTERRUPT_ENTRY(69) |
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334 | DISTINCT_INTERRUPT_ENTRY(70) |
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335 | DISTINCT_INTERRUPT_ENTRY(71) |
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336 | DISTINCT_INTERRUPT_ENTRY(72) |
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337 | DISTINCT_INTERRUPT_ENTRY(73) |
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338 | DISTINCT_INTERRUPT_ENTRY(74) |
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339 | DISTINCT_INTERRUPT_ENTRY(75) |
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340 | DISTINCT_INTERRUPT_ENTRY(76) |
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341 | DISTINCT_INTERRUPT_ENTRY(77) |
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342 | DISTINCT_INTERRUPT_ENTRY(78) |
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343 | DISTINCT_INTERRUPT_ENTRY(79) |
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344 | DISTINCT_INTERRUPT_ENTRY(80) |
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345 | DISTINCT_INTERRUPT_ENTRY(81) |
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346 | DISTINCT_INTERRUPT_ENTRY(82) |
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347 | DISTINCT_INTERRUPT_ENTRY(83) |
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348 | DISTINCT_INTERRUPT_ENTRY(84) |
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349 | DISTINCT_INTERRUPT_ENTRY(85) |
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350 | DISTINCT_INTERRUPT_ENTRY(86) |
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351 | DISTINCT_INTERRUPT_ENTRY(87) |
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352 | DISTINCT_INTERRUPT_ENTRY(88) |
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353 | DISTINCT_INTERRUPT_ENTRY(89) |
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354 | DISTINCT_INTERRUPT_ENTRY(90) |
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355 | DISTINCT_INTERRUPT_ENTRY(91) |
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356 | DISTINCT_INTERRUPT_ENTRY(92) |
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357 | DISTINCT_INTERRUPT_ENTRY(93) |
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358 | DISTINCT_INTERRUPT_ENTRY(94) |
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359 | DISTINCT_INTERRUPT_ENTRY(95) |
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360 | DISTINCT_INTERRUPT_ENTRY(96) |
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361 | DISTINCT_INTERRUPT_ENTRY(97) |
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362 | DISTINCT_INTERRUPT_ENTRY(98) |
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363 | DISTINCT_INTERRUPT_ENTRY(99) |
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364 | DISTINCT_INTERRUPT_ENTRY(100) |
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365 | DISTINCT_INTERRUPT_ENTRY(101) |
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366 | DISTINCT_INTERRUPT_ENTRY(102) |
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367 | DISTINCT_INTERRUPT_ENTRY(103) |
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368 | DISTINCT_INTERRUPT_ENTRY(104) |
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369 | DISTINCT_INTERRUPT_ENTRY(105) |
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370 | DISTINCT_INTERRUPT_ENTRY(106) |
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371 | DISTINCT_INTERRUPT_ENTRY(107) |
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372 | DISTINCT_INTERRUPT_ENTRY(108) |
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373 | DISTINCT_INTERRUPT_ENTRY(109) |
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374 | DISTINCT_INTERRUPT_ENTRY(110) |
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375 | DISTINCT_INTERRUPT_ENTRY(111) |
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376 | DISTINCT_INTERRUPT_ENTRY(112) |
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377 | DISTINCT_INTERRUPT_ENTRY(113) |
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378 | DISTINCT_INTERRUPT_ENTRY(114) |
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379 | DISTINCT_INTERRUPT_ENTRY(115) |
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380 | DISTINCT_INTERRUPT_ENTRY(116) |
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381 | DISTINCT_INTERRUPT_ENTRY(117) |
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382 | DISTINCT_INTERRUPT_ENTRY(118) |
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383 | DISTINCT_INTERRUPT_ENTRY(119) |
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384 | DISTINCT_INTERRUPT_ENTRY(120) |
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385 | DISTINCT_INTERRUPT_ENTRY(121) |
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386 | DISTINCT_INTERRUPT_ENTRY(122) |
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387 | DISTINCT_INTERRUPT_ENTRY(123) |
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388 | DISTINCT_INTERRUPT_ENTRY(124) |
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389 | DISTINCT_INTERRUPT_ENTRY(125) |
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390 | DISTINCT_INTERRUPT_ENTRY(126) |
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391 | DISTINCT_INTERRUPT_ENTRY(127) |
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392 | DISTINCT_INTERRUPT_ENTRY(128) |
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393 | DISTINCT_INTERRUPT_ENTRY(129) |
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394 | DISTINCT_INTERRUPT_ENTRY(130) |
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395 | DISTINCT_INTERRUPT_ENTRY(131) |
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396 | DISTINCT_INTERRUPT_ENTRY(132) |
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397 | DISTINCT_INTERRUPT_ENTRY(133) |
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398 | DISTINCT_INTERRUPT_ENTRY(134) |
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399 | DISTINCT_INTERRUPT_ENTRY(135) |
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400 | DISTINCT_INTERRUPT_ENTRY(136) |
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401 | DISTINCT_INTERRUPT_ENTRY(137) |
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402 | DISTINCT_INTERRUPT_ENTRY(138) |
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403 | DISTINCT_INTERRUPT_ENTRY(139) |
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404 | DISTINCT_INTERRUPT_ENTRY(140) |
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405 | DISTINCT_INTERRUPT_ENTRY(141) |
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406 | DISTINCT_INTERRUPT_ENTRY(142) |
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407 | DISTINCT_INTERRUPT_ENTRY(143) |
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408 | DISTINCT_INTERRUPT_ENTRY(144) |
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409 | DISTINCT_INTERRUPT_ENTRY(145) |
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410 | DISTINCT_INTERRUPT_ENTRY(146) |
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411 | DISTINCT_INTERRUPT_ENTRY(147) |
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412 | DISTINCT_INTERRUPT_ENTRY(148) |
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413 | DISTINCT_INTERRUPT_ENTRY(149) |
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414 | DISTINCT_INTERRUPT_ENTRY(150) |
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415 | DISTINCT_INTERRUPT_ENTRY(151) |
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416 | DISTINCT_INTERRUPT_ENTRY(152) |
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417 | DISTINCT_INTERRUPT_ENTRY(153) |
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418 | DISTINCT_INTERRUPT_ENTRY(154) |
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419 | DISTINCT_INTERRUPT_ENTRY(155) |
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420 | DISTINCT_INTERRUPT_ENTRY(156) |
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421 | DISTINCT_INTERRUPT_ENTRY(157) |
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422 | DISTINCT_INTERRUPT_ENTRY(158) |
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423 | DISTINCT_INTERRUPT_ENTRY(159) |
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424 | DISTINCT_INTERRUPT_ENTRY(160) |
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425 | DISTINCT_INTERRUPT_ENTRY(161) |
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426 | DISTINCT_INTERRUPT_ENTRY(162) |
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427 | DISTINCT_INTERRUPT_ENTRY(163) |
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428 | DISTINCT_INTERRUPT_ENTRY(164) |
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429 | DISTINCT_INTERRUPT_ENTRY(165) |
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430 | DISTINCT_INTERRUPT_ENTRY(166) |
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431 | DISTINCT_INTERRUPT_ENTRY(167) |
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432 | DISTINCT_INTERRUPT_ENTRY(168) |
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433 | DISTINCT_INTERRUPT_ENTRY(169) |
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434 | DISTINCT_INTERRUPT_ENTRY(170) |
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435 | DISTINCT_INTERRUPT_ENTRY(171) |
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436 | DISTINCT_INTERRUPT_ENTRY(172) |
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437 | DISTINCT_INTERRUPT_ENTRY(173) |
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438 | DISTINCT_INTERRUPT_ENTRY(174) |
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439 | DISTINCT_INTERRUPT_ENTRY(175) |
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440 | DISTINCT_INTERRUPT_ENTRY(176) |
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441 | DISTINCT_INTERRUPT_ENTRY(177) |
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442 | DISTINCT_INTERRUPT_ENTRY(178) |
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443 | DISTINCT_INTERRUPT_ENTRY(179) |
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444 | DISTINCT_INTERRUPT_ENTRY(180) |
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445 | DISTINCT_INTERRUPT_ENTRY(181) |
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446 | DISTINCT_INTERRUPT_ENTRY(182) |
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447 | DISTINCT_INTERRUPT_ENTRY(183) |
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448 | DISTINCT_INTERRUPT_ENTRY(184) |
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449 | DISTINCT_INTERRUPT_ENTRY(185) |
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450 | DISTINCT_INTERRUPT_ENTRY(186) |
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451 | DISTINCT_INTERRUPT_ENTRY(187) |
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452 | DISTINCT_INTERRUPT_ENTRY(188) |
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453 | DISTINCT_INTERRUPT_ENTRY(189) |
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454 | DISTINCT_INTERRUPT_ENTRY(190) |
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455 | DISTINCT_INTERRUPT_ENTRY(191) |
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456 | DISTINCT_INTERRUPT_ENTRY(192) |
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457 | DISTINCT_INTERRUPT_ENTRY(193) |
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458 | DISTINCT_INTERRUPT_ENTRY(194) |
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459 | DISTINCT_INTERRUPT_ENTRY(195) |
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460 | DISTINCT_INTERRUPT_ENTRY(196) |
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461 | DISTINCT_INTERRUPT_ENTRY(197) |
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462 | DISTINCT_INTERRUPT_ENTRY(198) |
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463 | DISTINCT_INTERRUPT_ENTRY(199) |
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464 | DISTINCT_INTERRUPT_ENTRY(200) |
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465 | DISTINCT_INTERRUPT_ENTRY(201) |
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466 | DISTINCT_INTERRUPT_ENTRY(202) |
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467 | DISTINCT_INTERRUPT_ENTRY(203) |
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468 | DISTINCT_INTERRUPT_ENTRY(204) |
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469 | DISTINCT_INTERRUPT_ENTRY(205) |
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470 | DISTINCT_INTERRUPT_ENTRY(206) |
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471 | DISTINCT_INTERRUPT_ENTRY(207) |
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472 | DISTINCT_INTERRUPT_ENTRY(208) |
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473 | DISTINCT_INTERRUPT_ENTRY(209) |
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474 | DISTINCT_INTERRUPT_ENTRY(210) |
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475 | DISTINCT_INTERRUPT_ENTRY(211) |
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476 | DISTINCT_INTERRUPT_ENTRY(212) |
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477 | DISTINCT_INTERRUPT_ENTRY(213) |
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478 | DISTINCT_INTERRUPT_ENTRY(214) |
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479 | DISTINCT_INTERRUPT_ENTRY(215) |
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480 | DISTINCT_INTERRUPT_ENTRY(216) |
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481 | DISTINCT_INTERRUPT_ENTRY(217) |
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482 | DISTINCT_INTERRUPT_ENTRY(218) |
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483 | DISTINCT_INTERRUPT_ENTRY(219) |
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484 | DISTINCT_INTERRUPT_ENTRY(220) |
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485 | DISTINCT_INTERRUPT_ENTRY(221) |
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486 | DISTINCT_INTERRUPT_ENTRY(222) |
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487 | DISTINCT_INTERRUPT_ENTRY(223) |
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488 | DISTINCT_INTERRUPT_ENTRY(224) |
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489 | DISTINCT_INTERRUPT_ENTRY(225) |
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490 | DISTINCT_INTERRUPT_ENTRY(226) |
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491 | DISTINCT_INTERRUPT_ENTRY(227) |
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492 | DISTINCT_INTERRUPT_ENTRY(228) |
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493 | DISTINCT_INTERRUPT_ENTRY(229) |
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494 | DISTINCT_INTERRUPT_ENTRY(230) |
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495 | DISTINCT_INTERRUPT_ENTRY(231) |
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496 | DISTINCT_INTERRUPT_ENTRY(232) |
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497 | DISTINCT_INTERRUPT_ENTRY(233) |
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498 | DISTINCT_INTERRUPT_ENTRY(234) |
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499 | DISTINCT_INTERRUPT_ENTRY(235) |
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500 | DISTINCT_INTERRUPT_ENTRY(236) |
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501 | DISTINCT_INTERRUPT_ENTRY(237) |
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502 | DISTINCT_INTERRUPT_ENTRY(238) |
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503 | DISTINCT_INTERRUPT_ENTRY(239) |
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504 | DISTINCT_INTERRUPT_ENTRY(240) |
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505 | DISTINCT_INTERRUPT_ENTRY(241) |
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506 | DISTINCT_INTERRUPT_ENTRY(242) |
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507 | DISTINCT_INTERRUPT_ENTRY(243) |
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508 | DISTINCT_INTERRUPT_ENTRY(244) |
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509 | DISTINCT_INTERRUPT_ENTRY(245) |
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510 | DISTINCT_INTERRUPT_ENTRY(246) |
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511 | DISTINCT_INTERRUPT_ENTRY(247) |
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512 | DISTINCT_INTERRUPT_ENTRY(248) |
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513 | DISTINCT_INTERRUPT_ENTRY(249) |
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514 | DISTINCT_INTERRUPT_ENTRY(250) |
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515 | DISTINCT_INTERRUPT_ENTRY(251) |
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516 | DISTINCT_INTERRUPT_ENTRY(252) |
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517 | DISTINCT_INTERRUPT_ENTRY(253) |
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518 | DISTINCT_INTERRUPT_ENTRY(254) |
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519 | DISTINCT_INTERRUPT_ENTRY(255) |
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520 | |
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521 | /*PAGE |
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522 | * void _ISR_Dispatch() |
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523 | * |
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524 | * Entry point from the outermost interrupt service routine exit. |
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525 | * The current stack is the supervisor mode stack. |
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526 | */ |
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527 | |
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528 | PUBLIC (_ISR_Dispatch) |
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529 | SYM (_ISR_Dispatch): |
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530 | |
---|
531 | call SYM (_Thread_Dispatch) # invoke Dispatcher |
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532 | |
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533 | /* |
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534 | * BEGINNING OF DE-ESTABLISH SEGMENTS |
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535 | * |
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536 | * NOTE: Make sure there is code here if code is added to |
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537 | * load the segment registers. |
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538 | * |
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539 | */ |
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540 | |
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541 | /***** DE-ESTABLISH SEGMENTS CODE GOES HERE ****/ |
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542 | |
---|
543 | /* |
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544 | * END OF DE-ESTABLISH SEGMENTS |
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545 | */ |
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546 | |
---|
547 | popa # restore general registers |
---|
548 | iret # return to interrupted thread |
---|
549 | |
---|
550 | /* |
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551 | * GO32 does not require these segment related routines. |
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552 | */ |
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553 | |
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554 | #ifndef __GO32__ |
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555 | /*PAGE |
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556 | * |
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557 | * void i386_Install_idt( |
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558 | * unsigned32 source_offset, |
---|
559 | * unsigned16 destination_segment, |
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560 | * unsigned32 destination_offset |
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561 | * ); |
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562 | */ |
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563 | |
---|
564 | .p2align 2 |
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565 | PUBLIC (i386_Install_idt) |
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566 | |
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567 | .set INSTALL_IDT_SAVED_REGS, 8 |
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568 | |
---|
569 | .set SOURCE_OFFSET_ARG, INSTALL_IDT_SAVED_REGS + 4 |
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570 | .set DESTINATION_SEGMENT_ARG, INSTALL_IDT_SAVED_REGS + 8 |
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571 | .set DESTINATION_OFFSET_ARG, INSTALL_IDT_SAVED_REGS + 12 |
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572 | |
---|
573 | SYM (i386_Install_idt): |
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574 | push esi |
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575 | push edi |
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576 | |
---|
577 | movl SOURCE_OFFSET_ARG(esp),esi |
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578 | movl DESTINATION_OFFSET_ARG(esp),edi |
---|
579 | |
---|
580 | pushf # save flags |
---|
581 | cli # DISABLE INTERRUPTS!!! |
---|
582 | |
---|
583 | movw DESTINATION_SEGMENT_ARG+4(esp),ax |
---|
584 | push es # save es |
---|
585 | movw ax,es |
---|
586 | movsl # copy 1st half of IDT entry |
---|
587 | movsl # copy 2nd half of IDT entry |
---|
588 | pop es # restore es |
---|
589 | |
---|
590 | popf # ENABLE INTERRUPTS!!! |
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591 | |
---|
592 | pop edi |
---|
593 | pop esi |
---|
594 | ret |
---|
595 | |
---|
596 | /* |
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597 | * void *i386_Logical_to_physical( |
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598 | * rtems_unsigned16 segment, |
---|
599 | * void *address |
---|
600 | * ); |
---|
601 | * |
---|
602 | * Returns thirty-two bit physical address for segment:address. |
---|
603 | */ |
---|
604 | |
---|
605 | .set SEGMENT_ARG, 4 |
---|
606 | .set ADDRESS_ARG, 8 |
---|
607 | |
---|
608 | PUBLIC (i386_Logical_to_physical) |
---|
609 | |
---|
610 | SYM (i386_Logical_to_physical): |
---|
611 | |
---|
612 | xorl eax,eax # clear eax |
---|
613 | movzwl SEGMENT_ARG(esp),ecx # ecx = segment value |
---|
614 | movl $ SYM (_Global_descriptor_table),edx |
---|
615 | # edx = address of our GDT |
---|
616 | addl ecx,edx # edx = address of desired entry |
---|
617 | movb 7(edx),ah # ah = base 31:24 |
---|
618 | movb 4(edx),al # al = base 23:16 |
---|
619 | shll $16,eax # move ax into correct bits |
---|
620 | movw 2(edx),ax # ax = base 0:15 |
---|
621 | movl ADDRESS_ARG(esp),ecx # ecx = address to convert |
---|
622 | addl eax,ecx # ecx = physical address equivalent |
---|
623 | movl ecx,eax # eax = ecx |
---|
624 | ret |
---|
625 | |
---|
626 | /* |
---|
627 | * void *i386_Physical_to_logical( |
---|
628 | * rtems_unsigned16 segment, |
---|
629 | * void *address |
---|
630 | * ); |
---|
631 | * |
---|
632 | * Returns thirty-two bit physical address for segment:address. |
---|
633 | */ |
---|
634 | |
---|
635 | /* |
---|
636 | *.set SEGMENT_ARG, 4 |
---|
637 | *.set ADDRESS_ARG, 8 -- use sets from above |
---|
638 | */ |
---|
639 | |
---|
640 | PUBLIC (i386_Physical_to_logical) |
---|
641 | |
---|
642 | SYM (i386_Physical_to_logical): |
---|
643 | xorl eax,eax # clear eax |
---|
644 | movzwl SEGMENT_ARG(esp),ecx # ecx = segment value |
---|
645 | movl $ SYM (_Global_descriptor_table),edx |
---|
646 | # edx = address of our GDT |
---|
647 | addl ecx,edx # edx = address of desired entry |
---|
648 | movb 7(edx),ah # ah = base 31:24 |
---|
649 | movb 4(edx),al # al = base 23:16 |
---|
650 | shll $16,eax # move ax into correct bits |
---|
651 | movw 2(edx),ax # ax = base 0:15 |
---|
652 | movl ADDRESS_ARG(esp),ecx # ecx = address to convert |
---|
653 | subl eax,ecx # ecx = logical address equivalent |
---|
654 | movl ecx,eax # eax = ecx |
---|
655 | ret |
---|
656 | #endif /* __GO32__ */ |
---|
657 | |
---|
658 | END_CODE |
---|
659 | |
---|
660 | END |
---|