1 | /* registers.h |
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2 | * |
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3 | * This file contains definition and constants related to Intel Cpu |
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4 | * |
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5 | * COPYRIGHT (c) 1998 valette@crf.canon.fr |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.OARcorp.com/rtems/license.html. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #ifndef _LIBCPU_i386_REGISTERS_H |
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15 | #define _LIBCPU_i386_REGISTERS_H |
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16 | |
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17 | /* |
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18 | * definition related to EFLAGS |
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19 | */ |
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20 | #define EFLAGS_CARRY 0x1 |
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21 | #define EFLAGS_PARITY 0x4 |
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22 | |
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23 | #define EFLAGS_AUX_CARRY 0x10 |
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24 | #define EFLAGS_ZERO 0x40 |
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25 | #define EFLAGS_SIGN 0x80 |
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26 | |
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27 | #define EFLAGS_TRAP 0x100 |
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28 | #define EFLAGS_INTR_ENABLE 0x200 |
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29 | #define EFLAGS_DIRECTION 0x400 |
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30 | #define EFLAGS_OVERFLOW 0x800 |
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31 | |
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32 | #define EFLAGS_IOPL_MASK 0x3000 |
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33 | #define EFLAGS_NESTED_TASK 0x8000 |
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34 | |
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35 | #define EFLAGS_RESUME 0x10000 |
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36 | #define EFLAGS_VIRTUAL_MODE 0x20000 |
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37 | #define EFLAGS_ALIGN_CHECK 0x40000 |
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38 | #define EFLAGS_VIRTUAL_INTR 0x80000 |
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39 | |
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40 | #define EFLAGS_VIRTUAL_INTR_PEND 0x100000 |
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41 | #define EFLAGS_ID 0x200000 |
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42 | |
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43 | /* |
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44 | * definitions related to CR0 |
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45 | */ |
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46 | #define CR0_PROTECTION_ENABLE 0x1 |
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47 | #define CR0_MONITOR_COPROC 0x2 |
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48 | #define CR0_COPROC_SOFT_EMUL 0x4 |
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49 | #define CR0_FLOATING_INSTR_EXCEPTION 0x8 |
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50 | |
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51 | #define CR0_EXTENSION_TYPE 0x10 |
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52 | #define CR0_NUMERIC_ERROR 0x20 |
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53 | |
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54 | #define CR0_WRITE_PROTECT 0x10000 |
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55 | #define CR0_ALIGMENT_MASK 0x40000 |
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56 | |
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57 | #define CR0_NO_WRITE_THROUGH 0x20000000 |
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58 | #define CR0_PAGE_LEVEL_CACHE_DISABLE 0x40000000 |
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59 | #define CR0_PAGING 0x80000000 |
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60 | |
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61 | /* |
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62 | * definitions related to CR3 |
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63 | */ |
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64 | |
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65 | #define CR3_PAGE_CACHE_DISABLE 0x10 |
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66 | #define CR3_PAGE_WRITE_THROUGH 0x8 |
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67 | |
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68 | |
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69 | #ifndef ASM |
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70 | |
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71 | /* |
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72 | * definition of eflags registers has a bit field structure |
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73 | */ |
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74 | typedef struct { |
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75 | /* |
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76 | * fist byte : bits 0->7 |
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77 | */ |
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78 | unsigned int carry : 1; |
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79 | unsigned int : 1; |
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80 | unsigned int parity : 1; |
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81 | unsigned int : 1; |
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82 | |
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83 | unsigned int auxiliary_carry : 1; |
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84 | unsigned int : 1; |
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85 | unsigned int zero : 1; /* result is zero */ |
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86 | unsigned int sign : 1; /* result is less than zero */ |
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87 | /* |
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88 | * Second byte : bits 7->15 |
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89 | */ |
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90 | unsigned int trap : 1; |
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91 | unsigned int intr_enable : 1; /* set => intr on */ |
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92 | unsigned int direction : 1; /* set => autodecrement */ |
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93 | unsigned int overflow : 1; |
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94 | |
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95 | unsigned int IO_privilege : 2; |
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96 | unsigned int nested_task : 1; |
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97 | unsigned int : 1; |
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98 | /* |
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99 | * Third byte : bits 15->23 |
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100 | */ |
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101 | unsigned int resume : 1; |
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102 | unsigned int virtual_mode : 1; |
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103 | unsigned int aligment_check : 1; |
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104 | unsigned int virtual_intr : 1; |
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105 | |
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106 | unsigned int virtual_intr_pending : 1; |
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107 | unsigned int id : 1; |
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108 | unsigned int : 2; |
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109 | |
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110 | /* |
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111 | * fourth byte : bits 24->31 : UNUSED |
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112 | */ |
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113 | unsigned int : 8; |
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114 | }eflags_bits; |
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115 | |
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116 | typedef union { |
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117 | eflags_bits eflags; |
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118 | unsigned int i; |
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119 | }eflags; |
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120 | /* |
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121 | * definition of eflags registers has a bit field structure |
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122 | */ |
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123 | typedef struct { |
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124 | /* |
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125 | * fist byte : bits 0->7 |
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126 | */ |
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127 | unsigned int protection_enable : 1; |
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128 | unsigned int monitor_coproc : 1; |
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129 | unsigned int coproc_soft_emul : 1; |
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130 | unsigned int floating_instr_except : 1; |
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131 | |
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132 | unsigned int extension_type : 1; |
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133 | unsigned int numeric_error : 1; |
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134 | unsigned int : 2; |
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135 | /* |
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136 | * second byte 8->15 : UNUSED |
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137 | */ |
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138 | unsigned int : 8; |
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139 | /* |
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140 | * third byte 16->23 |
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141 | */ |
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142 | unsigned int write_protect : 1; |
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143 | unsigned int : 1; |
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144 | unsigned int aligment_mask : 1; |
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145 | unsigned int : 1; |
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146 | |
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147 | unsigned int : 4; |
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148 | /* |
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149 | * fourth byte 24->31 |
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150 | */ |
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151 | unsigned int : 4; |
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152 | |
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153 | unsigned int : 1; |
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154 | unsigned int no_write_through : 1; |
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155 | unsigned int page_level_cache_disable : 1; |
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156 | unsigned int paging : 1; |
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157 | }cr0_bits; |
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158 | |
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159 | typedef union { |
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160 | cr0_bits cr0; |
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161 | unsigned int i; |
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162 | }cr0; |
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163 | |
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164 | /* |
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165 | * definition of cr3 registers has a bit field structure |
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166 | */ |
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167 | typedef struct { |
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168 | |
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169 | unsigned int : 3; |
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170 | unsigned int page_write_transparent : 1; |
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171 | unsigned int page_cache_disable : 1; |
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172 | unsigned int : 7; |
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173 | unsigned int page_directory_base :20; |
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174 | }cr3_bits; |
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175 | |
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176 | typedef union { |
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177 | cr3_bits cr3; |
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178 | unsigned int i; |
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179 | }cr3; |
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180 | |
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181 | #endif |
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182 | |
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183 | #endif |
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184 | |
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