[6d6891e] | 1 | /** |
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| 2 | * @file rtems/score/i386.h |
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| 3 | */ |
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| 4 | |
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| 5 | /* |
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[7908ba5b] | 6 | * This include file contains information pertaining to the Intel |
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| 7 | * i386 processor. |
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| 8 | * |
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[08311cc3] | 9 | * COPYRIGHT (c) 1989-1999. |
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[7908ba5b] | 10 | * On-Line Applications Research Corporation (OAR). |
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| 11 | * |
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| 12 | * The license and distribution terms for this file may be |
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| 13 | * found in the file LICENSE in this distribution or at |
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[51fa11c] | 14 | * http://www.rtems.com/license/LICENSE. |
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[7908ba5b] | 15 | * |
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| 16 | * $Id$ |
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| 17 | */ |
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| 18 | |
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| 19 | #ifndef __i386_h |
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| 20 | #define __i386_h |
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| 21 | |
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| 22 | #ifdef __cplusplus |
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| 23 | extern "C" { |
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| 24 | #endif |
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| 25 | |
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| 26 | /* |
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| 27 | * This section contains the information required to build |
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| 28 | * RTEMS for a particular member of the Intel i386 |
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| 29 | * family when executing in protected mode. It does |
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| 30 | * this by setting variables to indicate which implementation |
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| 31 | * dependent features are present in a particular member |
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| 32 | * of the family. |
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| 33 | * |
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| 34 | * Currently recognized: |
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| 35 | * i386_fp (i386 DX or SX w/i387) |
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| 36 | * i386_nofp (i386 DX or SX w/o i387) |
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| 37 | * i486dx |
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| 38 | * i486sx |
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| 39 | * pentium |
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[318f591] | 40 | * pentiumpro |
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[7908ba5b] | 41 | * |
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| 42 | * CPU Model Feature Flags: |
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| 43 | * |
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[84c53452] | 44 | * I386_HAS_BSWAP: Defined to "1" if the instruction for endian swapping |
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[7908ba5b] | 45 | * (bswap) should be used. This instruction appears to |
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| 46 | * be present in all i486's and above. |
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| 47 | * |
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| 48 | * I386_HAS_FPU: Defined to "1" if the CPU has an FPU. |
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| 49 | * |
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| 50 | */ |
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| 51 | |
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[95990b57] | 52 | #if defined(_SOFT_FLOAT) |
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| 53 | #define I386_HAS_FPU 0 |
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| 54 | #else |
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| 55 | #define I386_HAS_FPU 1 |
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| 56 | #endif |
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[7908ba5b] | 57 | |
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[95990b57] | 58 | #if defined(__pentiumpro__) |
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[7908ba5b] | 59 | |
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[95990b57] | 60 | #define CPU_MODEL_NAME "Pentium Pro" |
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[7908ba5b] | 61 | |
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[95990b57] | 62 | #elif defined(__i586__) |
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[7908ba5b] | 63 | |
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[95990b57] | 64 | # if defined(__pentium__) |
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| 65 | # define CPU_MODEL_NAME "Pentium" |
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[a4e45452] | 66 | # elif defined(__k6__) |
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[95990b57] | 67 | # define CPU_MODEL_NAME "K6" |
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| 68 | # else |
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| 69 | # define CPU_MODEL_NAME "i586" |
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| 70 | # endif |
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[7908ba5b] | 71 | |
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[95990b57] | 72 | #elif defined(__i486__) |
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[7908ba5b] | 73 | |
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[95990b57] | 74 | # if !defined(_SOFT_FLOAT) |
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| 75 | # define CPU_MODEL_NAME "i486dx" |
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| 76 | # else |
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| 77 | # define CPU_MODEL_NAME "i486sx" |
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| 78 | # endif |
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[7908ba5b] | 79 | |
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[95990b57] | 80 | #elif defined(__i386__) |
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[7908ba5b] | 81 | |
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[95990b57] | 82 | #define I386_HAS_BSWAP 0 |
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[318f591] | 83 | |
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[95990b57] | 84 | # if !defined(_SOFT_FLOAT) |
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| 85 | # define CPU_MODEL_NAME "i386 with i387" |
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| 86 | # else |
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| 87 | # define CPU_MODEL_NAME "i386 w/o i387" |
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| 88 | # endif |
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[318f591] | 89 | |
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[7908ba5b] | 90 | #else |
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[95990b57] | 91 | #error "Unknown CPU Model" |
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[7908ba5b] | 92 | #endif |
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| 93 | |
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| 94 | /* |
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| 95 | * Set default values for CPU model feature flags |
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| 96 | * |
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| 97 | * NOTE: These settings are chosen to reflect most of the family members. |
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| 98 | */ |
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| 99 | |
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| 100 | #ifndef I386_HAS_FPU |
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| 101 | #define I386_HAS_FPU 1 |
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| 102 | #endif |
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| 103 | |
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| 104 | #ifndef I386_HAS_BSWAP |
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| 105 | #define I386_HAS_BSWAP 1 |
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| 106 | #endif |
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| 107 | |
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| 108 | /* |
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| 109 | * Define the name of the CPU family. |
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| 110 | */ |
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| 111 | |
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| 112 | #define CPU_NAME "Intel i386" |
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| 113 | |
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| 114 | #ifndef ASM |
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| 115 | |
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| 116 | /* |
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| 117 | * The following routine swaps the endian format of an unsigned int. |
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| 118 | * It must be static so it can be referenced indirectly. |
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| 119 | */ |
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| 120 | |
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[27138f3] | 121 | static inline unsigned int i386_swap_u32( |
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[7908ba5b] | 122 | unsigned int value |
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| 123 | ) |
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| 124 | { |
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| 125 | unsigned long lout; |
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| 126 | |
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| 127 | #if (I386_HAS_BSWAP == 0) |
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| 128 | asm volatile( "rorw $8,%%ax;" |
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| 129 | "rorl $16,%0;" |
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| 130 | "rorw $8,%%ax" : "=a" (lout) : "0" (value) ); |
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| 131 | #else |
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| 132 | __asm__ volatile( "bswap %0" : "=r" (lout) : "0" (value)); |
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| 133 | #endif |
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| 134 | return( lout ); |
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| 135 | } |
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| 136 | |
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[27138f3] | 137 | static inline unsigned int i386_swap_u16( |
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[7908ba5b] | 138 | unsigned int value |
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| 139 | ) |
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| 140 | { |
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| 141 | unsigned short sout; |
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| 142 | |
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| 143 | __asm__ volatile( "rorw $8,%0" : "=r" (sout) : "0" (value)); |
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| 144 | return (sout); |
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| 145 | } |
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| 146 | |
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| 147 | |
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[8ef3818] | 148 | /* |
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| 149 | * Added for pagination management |
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| 150 | */ |
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[84c53452] | 151 | |
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[8ef3818] | 152 | static inline unsigned int i386_get_cr0() |
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| 153 | { |
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| 154 | register unsigned int segment = 0; |
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| 155 | |
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| 156 | asm volatile ( "movl %%cr0,%0" : "=r" (segment) : "0" (segment) ); |
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| 157 | |
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| 158 | return segment; |
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| 159 | } |
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| 160 | |
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| 161 | static inline void i386_set_cr0(unsigned int segment) |
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| 162 | { |
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| 163 | asm volatile ( "movl %0,%%cr0" : "=r" (segment) : "0" (segment) ); |
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| 164 | } |
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| 165 | |
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| 166 | static inline unsigned int i386_get_cr2() |
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| 167 | { |
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| 168 | register unsigned int segment = 0; |
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| 169 | |
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| 170 | asm volatile ( "movl %%cr2,%0" : "=r" (segment) : "0" (segment) ); |
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| 171 | |
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| 172 | return segment; |
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| 173 | } |
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| 174 | |
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| 175 | static inline unsigned int i386_get_cr3() |
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| 176 | { |
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| 177 | register unsigned int segment = 0; |
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| 178 | |
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| 179 | asm volatile ( "movl %%cr3,%0" : "=r" (segment) : "0" (segment) ); |
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| 180 | |
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| 181 | return segment; |
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| 182 | } |
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| 183 | |
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| 184 | static inline void i386_set_cr3(unsigned int segment) |
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| 185 | { |
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| 186 | asm volatile ( "movl %0,%%cr3" : "=r" (segment) : "0" (segment) ); |
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| 187 | } |
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| 188 | |
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[7908ba5b] | 189 | /* routines */ |
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| 190 | |
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| 191 | /* |
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| 192 | * i386_Logical_to_physical |
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| 193 | * |
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| 194 | * Converts logical address to physical address. |
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| 195 | */ |
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| 196 | |
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| 197 | void *i386_Logical_to_physical( |
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| 198 | unsigned short segment, |
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| 199 | void *address |
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| 200 | ); |
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| 201 | |
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| 202 | /* |
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| 203 | * i386_Physical_to_logical |
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| 204 | * |
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| 205 | * Converts physical address to logical address. |
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| 206 | */ |
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| 207 | |
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| 208 | void *i386_Physical_to_logical( |
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| 209 | unsigned short segment, |
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| 210 | void *address |
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| 211 | ); |
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| 212 | |
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| 213 | |
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| 214 | /* |
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| 215 | * "Simpler" names for a lot of the things defined in this file |
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| 216 | */ |
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| 217 | |
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| 218 | /* segment access routines */ |
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[84c53452] | 219 | |
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[7908ba5b] | 220 | #define get_cs() i386_get_cs() |
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| 221 | #define get_ds() i386_get_ds() |
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| 222 | #define get_es() i386_get_es() |
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| 223 | #define get_ss() i386_get_ss() |
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| 224 | #define get_fs() i386_get_fs() |
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| 225 | #define get_gs() i386_get_gs() |
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[84c53452] | 226 | |
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[27138f3] | 227 | #define CPU_swap_u32( _value ) i386_swap_u32( _value ) |
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| 228 | #define CPU_swap_u16( _value ) i386_swap_u16( _value ) |
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[84c53452] | 229 | |
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[7908ba5b] | 230 | /* i80x86 I/O instructions */ |
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[84c53452] | 231 | |
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[7908ba5b] | 232 | #define outport_byte( _port, _value ) i386_outport_byte( _port, _value ) |
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| 233 | #define outport_word( _port, _value ) i386_outport_word( _port, _value ) |
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| 234 | #define outport_long( _port, _value ) i386_outport_long( _port, _value ) |
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| 235 | #define inport_byte( _port, _value ) i386_inport_byte( _port, _value ) |
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| 236 | #define inport_word( _port, _value ) i386_inport_word( _port, _value ) |
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| 237 | #define inport_long( _port, _value ) i386_inport_long( _port, _value ) |
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[84c53452] | 238 | |
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[7908ba5b] | 239 | |
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| 240 | #ifdef __cplusplus |
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| 241 | } |
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| 242 | #endif |
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| 243 | |
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| 244 | #endif /* !ASM */ |
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| 245 | |
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| 246 | #endif |
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