1 | /* i386.h |
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2 | * |
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3 | * This include file contains information pertaining to the Intel |
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4 | * i386 processor. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1998. |
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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 | #ifndef __i386_h |
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18 | #define __i386_h |
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19 | |
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20 | #ifdef __cplusplus |
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21 | extern "C" { |
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22 | #endif |
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23 | |
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24 | /* |
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25 | * This section contains the information required to build |
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26 | * RTEMS for a particular member of the Intel i386 |
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27 | * family when executing in protected mode. It does |
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28 | * this by setting variables to indicate which implementation |
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29 | * dependent features are present in a particular member |
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30 | * of the family. |
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31 | * |
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32 | * Currently recognized: |
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33 | * i386_fp (i386 DX or SX w/i387) |
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34 | * i386_nofp (i386 DX or SX w/o i387) |
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35 | * i486dx |
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36 | * i486sx |
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37 | * pentium |
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38 | * |
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39 | * CPU Model Feature Flags: |
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40 | * |
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41 | * I386_HAS_BSWAP: Defined to "1" if the instruction for endian swapping |
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42 | * (bswap) should be used. This instruction appears to |
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43 | * be present in all i486's and above. |
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44 | * |
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45 | * I386_HAS_FPU: Defined to "1" if the CPU has an FPU. |
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46 | * |
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47 | */ |
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48 | |
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49 | #if defined(i386_fp) |
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50 | |
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51 | #define CPU_MODEL_NAME "i386 with i387" |
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52 | #define I386_HAS_BSWAP 0 |
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53 | |
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54 | #elif defined(i386_nofp) |
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55 | |
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56 | #define CPU_MODEL_NAME "i386 w/o i387" |
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57 | #define I386_HAS_FPU 0 |
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58 | #define I386_HAS_BSWAP 0 |
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59 | |
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60 | #elif defined(i486dx) |
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61 | |
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62 | #define CPU_MODEL_NAME "i486dx" |
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63 | |
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64 | #elif defined(i486sx) |
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65 | |
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66 | #define CPU_MODEL_NAME "i486sx" |
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67 | #define I386_HAS_FPU 0 |
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68 | |
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69 | #elif defined(pentium) |
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70 | |
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71 | #define CPU_MODEL_NAME "Pentium" |
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72 | |
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73 | #else |
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74 | |
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75 | #error "Unsupported CPU Model" |
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76 | |
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77 | #endif |
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78 | |
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79 | /* |
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80 | * Set default values for CPU model feature flags |
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81 | * |
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82 | * NOTE: These settings are chosen to reflect most of the family members. |
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83 | */ |
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84 | |
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85 | #ifndef I386_HAS_FPU |
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86 | #define I386_HAS_FPU 1 |
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87 | #endif |
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88 | |
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89 | #ifndef I386_HAS_BSWAP |
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90 | #define I386_HAS_BSWAP 1 |
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91 | #endif |
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92 | |
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93 | /* |
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94 | * Define the name of the CPU family. |
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95 | */ |
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96 | |
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97 | #define CPU_NAME "Intel i386" |
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98 | |
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99 | #ifndef ASM |
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100 | |
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101 | /* |
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102 | * Structure which makes it easier to deal with LxDT and SxDT instructions. |
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103 | */ |
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104 | |
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105 | typedef struct { |
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106 | unsigned short limit; |
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107 | unsigned short physical_address[ 2 ]; |
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108 | } i386_DTR_load_save_format; |
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109 | |
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110 | /* See Chapter 5 - Memory Management in i386 manual */ |
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111 | |
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112 | typedef struct { |
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113 | unsigned short limit_0_15; |
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114 | unsigned short base_0_15; |
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115 | unsigned char base_16_23; |
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116 | unsigned char type_dt_dpl_p; |
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117 | unsigned char limit_16_19_granularity; |
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118 | unsigned char base_24_31; |
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119 | } i386_GDT_slot; |
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120 | |
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121 | /* See Chapter 9 - Exceptions and Interrupts in i386 manual |
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122 | * |
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123 | * NOTE: This is the IDT entry for interrupt gates ONLY. |
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124 | */ |
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125 | |
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126 | typedef struct { |
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127 | unsigned short offset_0_15; |
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128 | unsigned short segment_selector; |
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129 | unsigned char reserved; |
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130 | unsigned char p_dpl; |
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131 | unsigned short offset_16_31; |
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132 | } i386_IDT_slot; |
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133 | |
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134 | /* |
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135 | * Interrupt Level Macros |
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136 | */ |
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137 | |
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138 | #define i386_disable_interrupts( _level ) \ |
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139 | { \ |
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140 | _level = 0; /* avoids warnings */ \ |
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141 | asm volatile ( "pushf ; \ |
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142 | cli ; \ |
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143 | pop %0" \ |
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144 | : "=r" ((_level)) : "0" ((_level)) \ |
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145 | ); \ |
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146 | } |
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147 | |
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148 | #define i386_enable_interrupts( _level ) \ |
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149 | { \ |
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150 | asm volatile ( "push %0 ; \ |
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151 | popf" \ |
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152 | : "=r" ((_level)) : "0" ((_level)) \ |
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153 | ); \ |
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154 | } |
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155 | |
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156 | #define i386_flash_interrupts( _level ) \ |
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157 | { \ |
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158 | asm volatile ( "push %0 ; \ |
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159 | popf ; \ |
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160 | cli" \ |
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161 | : "=r" ((_level)) : "0" ((_level)) \ |
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162 | ); \ |
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163 | } |
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164 | |
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165 | #define i386_get_interrupt_level( _level ) \ |
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166 | do { \ |
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167 | register unsigned32 _eflags = 0; \ |
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168 | \ |
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169 | asm volatile ( "pushf ; \ |
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170 | pop %0" \ |
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171 | : "=r" ((_eflags)) : "0" ((_eflags)) \ |
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172 | ); \ |
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173 | \ |
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174 | _level = (_eflags & 0x0200) ? 0 : 1; \ |
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175 | } while (0) |
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176 | |
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177 | /* |
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178 | * The following routine swaps the endian format of an unsigned int. |
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179 | * It must be static so it can be referenced indirectly. |
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180 | */ |
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181 | |
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182 | static inline unsigned int i386_swap_U32( |
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183 | unsigned int value |
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184 | ) |
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185 | { |
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186 | unsigned long lout; |
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187 | |
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188 | #if (I386_HAS_BSWAP == 0) |
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189 | asm volatile( "rorw $8,%%ax;" |
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190 | "rorl $16,%0;" |
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191 | "rorw $8,%%ax" : "=a" (lout) : "0" (value) ); |
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192 | #else |
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193 | __asm__ volatile( "bswap %0" : "=r" (lout) : "0" (value)); |
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194 | #endif |
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195 | return( lout ); |
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196 | } |
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197 | |
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198 | static inline unsigned int i386_swap_U16( |
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199 | unsigned int value |
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200 | ) |
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201 | { |
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202 | unsigned short sout; |
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203 | |
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204 | __asm__ volatile( "rorw $8,%0" : "=r" (sout) : "0" (value)); |
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205 | return (sout); |
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206 | } |
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207 | |
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208 | /* |
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209 | * Segment Access Routines |
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210 | * |
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211 | * NOTE: Unfortunately, these are still static inlines even when the |
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212 | * "macro" implementation of the generic code is used. |
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213 | */ |
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214 | |
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215 | static inline unsigned short i386_get_cs() |
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216 | { |
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217 | register unsigned short segment = 0; |
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218 | |
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219 | asm volatile ( "movw %%cs,%0" : "=r" (segment) : "0" (segment) ); |
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220 | |
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221 | return segment; |
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222 | } |
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223 | |
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224 | static inline unsigned short i386_get_ds() |
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225 | { |
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226 | register unsigned short segment = 0; |
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227 | |
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228 | asm volatile ( "movw %%ds,%0" : "=r" (segment) : "0" (segment) ); |
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229 | |
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230 | return segment; |
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231 | } |
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232 | |
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233 | static inline unsigned short i386_get_es() |
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234 | { |
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235 | register unsigned short segment = 0; |
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236 | |
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237 | asm volatile ( "movw %%es,%0" : "=r" (segment) : "0" (segment) ); |
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238 | |
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239 | return segment; |
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240 | } |
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241 | |
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242 | static inline unsigned short i386_get_ss() |
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243 | { |
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244 | register unsigned short segment = 0; |
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245 | |
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246 | asm volatile ( "movw %%ss,%0" : "=r" (segment) : "0" (segment) ); |
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247 | |
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248 | return segment; |
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249 | } |
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250 | |
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251 | static inline unsigned short i386_get_fs() |
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252 | { |
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253 | register unsigned short segment = 0; |
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254 | |
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255 | asm volatile ( "movw %%fs,%0" : "=r" (segment) : "0" (segment) ); |
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256 | |
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257 | return segment; |
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258 | } |
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259 | |
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260 | static inline unsigned short i386_get_gs() |
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261 | { |
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262 | register unsigned short segment = 0; |
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263 | |
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264 | asm volatile ( "movw %%gs,%0" : "=r" (segment) : "0" (segment) ); |
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265 | |
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266 | return segment; |
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267 | } |
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268 | |
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269 | /* |
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270 | * IO Port Access Routines |
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271 | */ |
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272 | |
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273 | #define i386_outport_byte( _port, _value ) \ |
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274 | { register unsigned short __port = _port; \ |
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275 | register unsigned char __value = _value; \ |
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276 | \ |
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277 | asm volatile ( "outb %0,%1" : "=a" (__value), "=d" (__port) \ |
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278 | : "0" (__value), "1" (__port) \ |
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279 | ); \ |
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280 | } |
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281 | |
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282 | #define i386_outport_word( _port, _value ) \ |
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283 | { register unsigned short __port = _port; \ |
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284 | register unsigned short __value = _value; \ |
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285 | \ |
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286 | asm volatile ( "outw %0,%1" : "=a" (__value), "=d" (__port) \ |
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287 | : "0" (__value), "1" (__port) \ |
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288 | ); \ |
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289 | } |
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290 | |
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291 | #define i386_outport_long( _port, _value ) \ |
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292 | { register unsigned short __port = _port; \ |
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293 | register unsigned int __value = _value; \ |
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294 | \ |
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295 | asm volatile ( "outl %0,%1" : "=a" (__value), "=d" (__port) \ |
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296 | : "0" (__value), "1" (__port) \ |
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297 | ); \ |
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298 | } |
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299 | |
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300 | #define i386_inport_byte( _port, _value ) \ |
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301 | { register unsigned short __port = _port; \ |
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302 | register unsigned char __value = 0; \ |
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303 | \ |
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304 | asm volatile ( "inb %1,%0" : "=a" (__value), "=d" (__port) \ |
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305 | : "0" (__value), "1" (__port) \ |
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306 | ); \ |
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307 | _value = __value; \ |
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308 | } |
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309 | |
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310 | #define i386_inport_word( _port, _value ) \ |
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311 | { register unsigned short __port = _port; \ |
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312 | register unsigned short __value = 0; \ |
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313 | \ |
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314 | asm volatile ( "inw %1,%0" : "=a" (__value), "=d" (__port) \ |
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315 | : "0" (__value), "1" (__port) \ |
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316 | ); \ |
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317 | _value = __value; \ |
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318 | } |
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319 | |
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320 | #define i386_inport_long( _port, _value ) \ |
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321 | { register unsigned short __port = _port; \ |
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322 | register unsigned int __value = 0; \ |
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323 | \ |
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324 | asm volatile ( "inl %1,%0" : "=a" (__value), "=d" (__port) \ |
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325 | : "0" (__value), "1" (__port) \ |
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326 | ); \ |
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327 | _value = __value; \ |
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328 | } |
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329 | |
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330 | /* |
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331 | * Descriptor Table helper routines |
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332 | */ |
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333 | |
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334 | |
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335 | #define i386_get_GDTR( _gdtr_address ) \ |
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336 | { \ |
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337 | void *_gdtr = (_gdtr_address); \ |
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338 | \ |
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339 | asm volatile( "sgdt (%0)" : "=r" (_gdtr) : "0" (_gdtr) ); \ |
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340 | } |
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341 | |
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342 | #define i386_get_GDT_slot( _gdtr_base, _segment, _slot_address ) \ |
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343 | { \ |
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344 | register unsigned int _gdt_slot = (_gdtr_base) + (_segment); \ |
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345 | register volatile void *_slot = (_slot_address); \ |
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346 | register unsigned int _temporary = 0; \ |
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347 | \ |
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348 | asm volatile( "movl %%gs:(%0),%1 ; \ |
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349 | movl %1,(%2) ; \ |
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350 | movl %%gs:4(%0),%1 ; \ |
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351 | movl %1,4(%2)" \ |
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352 | : "=r" (_gdt_slot), "=r" (_temporary), "=r" (_slot) \ |
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353 | : "0" (_gdt_slot), "1" (_temporary), "2" (_slot) \ |
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354 | ); \ |
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355 | } |
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356 | |
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357 | #define i386_set_GDT_slot( _gdtr_base, _segment, _slot_address ) \ |
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358 | { \ |
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359 | register unsigned int _gdt_slot = (_gdtr_base) + (_segment); \ |
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360 | register volatile void *_slot = (_slot_address); \ |
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361 | register unsigned int _temporary = 0; \ |
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362 | \ |
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363 | asm volatile( "movl (%2),%1 ; \ |
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364 | movl %1,%%gs:(%0) ; \ |
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365 | movl 4(%2),%1 ; \ |
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366 | movl %1,%%gs:4(%0) \ |
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367 | " \ |
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368 | : "=r" (_gdt_slot), "=r" (_temporary), "=r" (_slot) \ |
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369 | : "0" (_gdt_slot), "1" (_temporary), "2" (_slot) \ |
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370 | ); \ |
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371 | } |
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372 | |
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373 | static inline void i386_set_segment( |
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374 | unsigned short segment, |
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375 | unsigned int base, |
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376 | unsigned int limit |
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377 | ) |
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378 | { |
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379 | i386_DTR_load_save_format gdtr; |
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380 | volatile i386_GDT_slot Gdt_slot; |
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381 | volatile i386_GDT_slot *gdt_slot = &Gdt_slot; |
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382 | unsigned short tmp_segment = 0; |
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383 | unsigned int limit_adjusted; |
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384 | |
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385 | /* load physical address of the GDT */ |
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386 | |
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387 | i386_get_GDTR( &gdtr ); |
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388 | |
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389 | gdt_slot->type_dt_dpl_p = 0x92; /* present, dpl=0, */ |
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390 | /* application=1, */ |
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391 | /* type=data read/write */ |
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392 | gdt_slot->limit_16_19_granularity = 0x40; /* 32 bit segment */ |
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393 | |
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394 | limit_adjusted = limit; |
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395 | if ( limit > 4095 ) { |
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396 | gdt_slot->limit_16_19_granularity |= 0x80; /* set granularity bit */ |
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397 | limit_adjusted /= 4096; |
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398 | } |
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399 | |
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400 | gdt_slot->limit_16_19_granularity |= (limit_adjusted >> 16) & 0xff; |
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401 | gdt_slot->limit_0_15 = limit_adjusted & 0xffff; |
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402 | |
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403 | gdt_slot->base_0_15 = base & 0xffff; |
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404 | gdt_slot->base_16_23 = (base >> 16) & 0xff; |
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405 | gdt_slot->base_24_31 = (base >> 24); |
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406 | |
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407 | i386_set_GDT_slot( |
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408 | gdtr.physical_address[0] + (gdtr.physical_address[1] << 16), |
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409 | segment, |
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410 | gdt_slot |
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411 | ); |
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412 | |
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413 | /* Now, reload all segment registers so the limit takes effect. */ |
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414 | |
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415 | asm volatile( "movw %%ds,%0 ; movw %0,%%ds |
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416 | movw %%es,%0 ; movw %0,%%es |
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417 | movw %%fs,%0 ; movw %0,%%fs |
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418 | movw %%gs,%0 ; movw %0,%%gs |
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419 | movw %%ss,%0 ; movw %0,%%ss" |
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420 | : "=r" (tmp_segment) |
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421 | : "0" (tmp_segment) |
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422 | ); |
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423 | |
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424 | } |
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425 | |
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426 | /* routines */ |
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427 | |
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428 | /* |
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429 | * i386_Logical_to_physical |
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430 | * |
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431 | * Converts logical address to physical address. |
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432 | */ |
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433 | |
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434 | void *i386_Logical_to_physical( |
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435 | unsigned short segment, |
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436 | void *address |
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437 | ); |
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438 | |
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439 | /* |
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440 | * i386_Physical_to_logical |
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441 | * |
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442 | * Converts physical address to logical address. |
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443 | */ |
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444 | |
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445 | void *i386_Physical_to_logical( |
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446 | unsigned short segment, |
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447 | void *address |
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448 | ); |
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449 | |
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450 | /* |
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451 | * i386_Install_idt |
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452 | * |
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453 | * This routine installs an IDT entry. |
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454 | */ |
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455 | |
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456 | void i386_Install_idt( |
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457 | unsigned int source_offset, |
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458 | unsigned short destination_segment, |
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459 | unsigned int destination_offset |
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460 | ); |
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461 | |
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462 | /* |
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463 | * "Simpler" names for a lot of the things defined in this file |
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464 | */ |
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465 | |
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466 | /* segment access routines */ |
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467 | |
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468 | #define get_cs() i386_get_cs() |
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469 | #define get_ds() i386_get_ds() |
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470 | #define get_es() i386_get_es() |
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471 | #define get_ss() i386_get_ss() |
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472 | #define get_fs() i386_get_fs() |
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473 | #define get_gs() i386_get_gs() |
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474 | |
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475 | #define CPU_swap_u32( _value ) i386_swap_U32( _value ) |
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476 | #define CPU_swap_u16( _value ) i386_swap_U16( _value ) |
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477 | |
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478 | /* i80x86 I/O instructions */ |
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479 | |
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480 | #define outport_byte( _port, _value ) i386_outport_byte( _port, _value ) |
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481 | #define outport_word( _port, _value ) i386_outport_word( _port, _value ) |
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482 | #define outport_long( _port, _value ) i386_outport_long( _port, _value ) |
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483 | #define inport_byte( _port, _value ) i386_inport_byte( _port, _value ) |
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484 | #define inport_word( _port, _value ) i386_inport_word( _port, _value ) |
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485 | #define inport_long( _port, _value ) i386_inport_long( _port, _value ) |
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486 | |
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487 | /* complicated static inline functions */ |
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488 | |
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489 | #define get_GDTR( _gdtr_address ) \ |
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490 | i386_get_GDTR( _gdtr_address ) |
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491 | |
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492 | #define get_GDT_slot( _gdtr_base, _segment, _slot_address ) \ |
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493 | i386_get_GDT_slot( _gdtr_base, _segment, _slot_address ) |
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494 | |
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495 | #define set_GDT_slot( _gdtr_base, _segment, _slot_address ) \ |
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496 | i386_set_GDT_slot( _gdtr_base, _segment, _slot_address ) |
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497 | |
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498 | #define set_segment( _segment, _base, _limit ) \ |
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499 | i386_set_segment( _segment, _base, _limit ) |
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500 | |
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501 | |
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502 | #ifdef __cplusplus |
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503 | } |
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504 | #endif |
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505 | |
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506 | #endif /* !ASM */ |
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507 | |
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508 | #endif |
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509 | /* end of include file */ |
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