[ac7d5ef0] | 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, 1990, 1991, 1992, 1993, 1994. |
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| 7 | * On-Line Applications Research Corporation (OAR). |
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| 8 | * All rights assigned to U.S. Government, 1994. |
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| 9 | * |
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| 10 | * This material may be reproduced by or for the U.S. Government pursuant |
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| 11 | * to the copyright license under the clause at DFARS 252.227-7013. This |
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| 12 | * notice must appear in all copies of this file and its derivatives. |
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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 | * The following define the CPU Family and Model within the family |
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| 26 | * |
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| 27 | * NOTE: The string "REPLACE_THIS_WITH_THE_CPU_MODEL" is replaced |
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| 28 | * with the name of the appropriate macro for this target CPU. |
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| 29 | */ |
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| 30 | |
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[88d594a] | 31 | #ifdef i386 |
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| 32 | #undef i386 |
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| 33 | #endif |
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[637df35] | 34 | #define i386 1 |
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[88d594a] | 35 | |
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| 36 | #ifdef REPLACE_THIS_WITH_THE_CPU_MODEL |
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| 37 | #undef REPLACE_THIS_WITH_THE_CPU_MODEL |
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| 38 | #endif |
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[ac7d5ef0] | 39 | #define REPLACE_THIS_WITH_THE_CPU_MODEL |
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[88d594a] | 40 | |
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| 41 | #ifdef REPLACE_THIS_WITH_THE_BSP |
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| 42 | #undef REPLACE_THIS_WITH_THE_BSP |
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| 43 | #endif |
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[ac7d5ef0] | 44 | #define REPLACE_THIS_WITH_THE_BSP |
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| 45 | |
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| 46 | /* |
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| 47 | * This section contains the information required to build |
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| 48 | * RTEMS for a particular member of the Intel i386 |
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| 49 | * family when executing in protected mode. It does |
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| 50 | * this by setting variables to indicate which implementation |
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| 51 | * dependent features are present in a particular member |
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| 52 | * of the family. |
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| 53 | * |
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| 54 | * Currently recognized: |
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| 55 | * i386_fp (i386 DX or SX w/i387) |
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| 56 | * i386_fp (i386 DX or SX w/o i387) |
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| 57 | * i486dx |
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| 58 | * i486sx |
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| 59 | * pentium |
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| 60 | * |
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| 61 | * Floating point is the only feature which currently varies. Eventually |
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| 62 | * the i486-plus level instruction for endian swapping should be added |
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| 63 | * to this feature list. |
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| 64 | */ |
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| 65 | |
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| 66 | #if defined(i386_fp) |
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| 67 | |
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[5e9b32b] | 68 | #define CPU_MODEL_NAME "i386 with i387" |
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[ac7d5ef0] | 69 | #define I386_HAS_FPU 1 |
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| 70 | |
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| 71 | #elif defined(i386_nofp) |
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| 72 | |
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[5e9b32b] | 73 | #define CPU_MODEL_NAME "i386 w/o i387" |
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[355c262c] | 74 | #define I386_HAS_FPU 0 |
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[ac7d5ef0] | 75 | |
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| 76 | #elif defined(i486dx) |
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| 77 | |
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[5e9b32b] | 78 | #define CPU_MODEL_NAME "i486dx" |
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[ac7d5ef0] | 79 | #define I386_HAS_FPU 1 |
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| 80 | |
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| 81 | #elif defined(i486sx) |
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| 82 | |
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[5e9b32b] | 83 | #define CPU_MODEL_NAME "i486sx" |
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[ac7d5ef0] | 84 | #define I386_HAS_FPU 0 |
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| 85 | |
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| 86 | #elif defined(pentium) |
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| 87 | |
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[5e9b32b] | 88 | #define CPU_MODEL_NAME "Pentium" |
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[ac7d5ef0] | 89 | #define I386_HAS_FPU 1 |
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| 90 | |
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| 91 | #else |
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| 92 | |
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| 93 | #error "Unsupported CPU Model" |
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| 94 | |
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| 95 | #endif |
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| 96 | |
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| 97 | /* |
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| 98 | * Define the name of the CPU family. |
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| 99 | */ |
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| 100 | |
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| 101 | #define CPU_NAME "Intel i386" |
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| 102 | |
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| 103 | #ifndef ASM |
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| 104 | |
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| 105 | /* |
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| 106 | * Structure which makes it easier to deal with LxDT and SxDT instructions. |
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| 107 | */ |
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[88d594a] | 108 | |
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[ac7d5ef0] | 109 | typedef struct { |
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| 110 | unsigned short limit; |
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| 111 | unsigned short physical_address[ 2 ]; |
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| 112 | } i386_DTR_load_save_format; |
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[88d594a] | 113 | |
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[ac7d5ef0] | 114 | /* See Chapter 5 - Memory Management in i386 manual */ |
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[88d594a] | 115 | |
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[ac7d5ef0] | 116 | typedef struct { |
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| 117 | unsigned short limit_0_15; |
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| 118 | unsigned short base_0_15; |
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| 119 | unsigned char base_16_23; |
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| 120 | unsigned char type_dt_dpl_p; |
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| 121 | unsigned char limit_16_19_granularity; |
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| 122 | unsigned char base_24_31; |
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| 123 | } i386_GDT_slot; |
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[88d594a] | 124 | |
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[ac7d5ef0] | 125 | /* See Chapter 9 - Exceptions and Interrupts in i386 manual |
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| 126 | * |
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| 127 | * NOTE: This is the IDT entry for interrupt gates ONLY. |
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| 128 | */ |
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[88d594a] | 129 | |
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[ac7d5ef0] | 130 | typedef struct { |
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| 131 | unsigned short offset_0_15; |
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| 132 | unsigned short segment_selector; |
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| 133 | unsigned char reserved; |
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| 134 | unsigned char p_dpl; |
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| 135 | unsigned short offset_16_31; |
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| 136 | } i386_IDT_slot; |
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| 137 | |
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[88d594a] | 138 | /* |
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| 139 | * Interrupt Level Macros |
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| 140 | */ |
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[ac7d5ef0] | 141 | |
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| 142 | #define i386_disable_interrupts( _level ) \ |
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| 143 | { \ |
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| 144 | _level = 0; /* avoids warnings */ \ |
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| 145 | asm volatile ( "pushf ; \ |
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| 146 | cli ; \ |
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| 147 | pop %0" \ |
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| 148 | : "=r" ((_level)) : "0" ((_level)) \ |
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| 149 | ); \ |
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| 150 | } |
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| 151 | |
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| 152 | #define i386_enable_interrupts( _level ) \ |
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| 153 | { \ |
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| 154 | asm volatile ( "push %0 ; \ |
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| 155 | popf" \ |
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| 156 | : "=r" ((_level)) : "0" ((_level)) \ |
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| 157 | ); \ |
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| 158 | } |
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| 159 | |
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| 160 | #define i386_flash_interrupts( _level ) \ |
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| 161 | { \ |
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| 162 | asm volatile ( "push %0 ; \ |
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| 163 | popf ; \ |
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| 164 | cli" \ |
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| 165 | : "=r" ((_level)) : "0" ((_level)) \ |
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| 166 | ); \ |
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| 167 | } |
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| 168 | |
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[3a4ae6c] | 169 | #define i386_get_interrupt_level( _level ) \ |
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| 170 | do { \ |
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| 171 | register unsigned32 _eflags = 0; \ |
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| 172 | \ |
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[3652ad35] | 173 | asm volatile ( "pushf ; \ |
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| 174 | pop %0" \ |
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[3a4ae6c] | 175 | : "=r" ((_eflags)) : "0" ((_eflags)) \ |
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| 176 | ); \ |
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| 177 | \ |
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| 178 | _level = (_eflags & 0x0200) ? 0 : 1; \ |
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| 179 | } while (0) |
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| 180 | |
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[ac7d5ef0] | 181 | /* |
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| 182 | * The following routine swaps the endian format of an unsigned int. |
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| 183 | * It must be static so it can be referenced indirectly. |
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| 184 | */ |
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| 185 | |
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| 186 | static inline unsigned int i386_swap_U32( |
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| 187 | unsigned int value |
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| 188 | ) |
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| 189 | { |
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| 190 | asm volatile( "rorw $8,%%ax;" |
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| 191 | "rorl $16,%0;" |
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| 192 | "rorw $8,%%ax" : "=a" (value) : "0" (value) ); |
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| 193 | return( value ); |
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| 194 | } |
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| 195 | |
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| 196 | /* |
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| 197 | * Segment Access Routines |
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| 198 | * |
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| 199 | * NOTE: Unfortunately, these are still static inlines even when the |
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| 200 | * "macro" implementation of the generic code is used. |
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| 201 | */ |
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| 202 | |
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| 203 | static inline unsigned short i386_get_cs() |
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| 204 | { |
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| 205 | register unsigned short segment = 0; |
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| 206 | |
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| 207 | asm volatile ( "movw %%cs,%0" : "=r" (segment) : "0" (segment) ); |
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| 208 | |
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| 209 | return segment; |
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| 210 | } |
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| 211 | |
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| 212 | static inline unsigned short i386_get_ds() |
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| 213 | { |
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| 214 | register unsigned short segment = 0; |
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| 215 | |
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| 216 | asm volatile ( "movw %%ds,%0" : "=r" (segment) : "0" (segment) ); |
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| 217 | |
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| 218 | return segment; |
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| 219 | } |
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| 220 | |
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| 221 | static inline unsigned short i386_get_es() |
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| 222 | { |
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| 223 | register unsigned short segment = 0; |
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| 224 | |
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| 225 | asm volatile ( "movw %%es,%0" : "=r" (segment) : "0" (segment) ); |
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| 226 | |
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| 227 | return segment; |
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| 228 | } |
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| 229 | |
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| 230 | static inline unsigned short i386_get_ss() |
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| 231 | { |
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| 232 | register unsigned short segment = 0; |
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| 233 | |
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| 234 | asm volatile ( "movw %%ss,%0" : "=r" (segment) : "0" (segment) ); |
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| 235 | |
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| 236 | return segment; |
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| 237 | } |
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| 238 | |
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| 239 | static inline unsigned short i386_get_fs() |
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| 240 | { |
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| 241 | register unsigned short segment = 0; |
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| 242 | |
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| 243 | asm volatile ( "movw %%fs,%0" : "=r" (segment) : "0" (segment) ); |
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| 244 | |
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| 245 | return segment; |
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| 246 | } |
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| 247 | |
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| 248 | static inline unsigned short i386_get_gs() |
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| 249 | { |
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| 250 | register unsigned short segment = 0; |
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| 251 | |
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| 252 | asm volatile ( "movw %%gs,%0" : "=r" (segment) : "0" (segment) ); |
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| 253 | |
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| 254 | return segment; |
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| 255 | } |
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| 256 | |
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| 257 | /* |
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| 258 | * IO Port Access Routines |
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| 259 | */ |
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| 260 | |
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| 261 | #define i386_outport_byte( _port, _value ) \ |
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| 262 | { register unsigned short __port = _port; \ |
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| 263 | register unsigned char __value = _value; \ |
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| 264 | \ |
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| 265 | asm volatile ( "outb %0,%1" : "=a" (__value), "=d" (__port) \ |
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| 266 | : "0" (__value), "1" (__port) \ |
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| 267 | ); \ |
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| 268 | } |
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| 269 | |
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| 270 | #define i386_outport_word( _port, _value ) \ |
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| 271 | { register unsigned short __port = _port; \ |
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| 272 | register unsigned short __value = _value; \ |
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| 273 | \ |
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| 274 | asm volatile ( "outw %0,%1" : "=a" (__value), "=d" (__port) \ |
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| 275 | : "0" (__value), "1" (__port) \ |
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| 276 | ); \ |
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| 277 | } |
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| 278 | |
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| 279 | #define i386_outport_long( _port, _value ) \ |
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| 280 | { register unsigned short __port = _port; \ |
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| 281 | register unsigned int __value = _value; \ |
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| 282 | \ |
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| 283 | asm volatile ( "outl %0,%1" : "=a" (__value), "=d" (__port) \ |
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| 284 | : "0" (__value), "1" (__port) \ |
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| 285 | ); \ |
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| 286 | } |
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| 287 | |
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| 288 | #define i386_inport_byte( _port, _value ) \ |
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| 289 | { register unsigned short __port = _port; \ |
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| 290 | register unsigned char __value = 0; \ |
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| 291 | \ |
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| 292 | asm volatile ( "inb %1,%0" : "=a" (__value), "=d" (__port) \ |
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| 293 | : "0" (__value), "1" (__port) \ |
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| 294 | ); \ |
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| 295 | _value = __value; \ |
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| 296 | } |
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| 297 | |
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| 298 | #define i386_inport_word( _port, _value ) \ |
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| 299 | { register unsigned short __port = _port; \ |
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| 300 | register unsigned short __value = 0; \ |
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| 301 | \ |
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| 302 | asm volatile ( "inw %1,%0" : "=a" (__value), "=d" (__port) \ |
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| 303 | : "0" (__value), "1" (__port) \ |
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| 304 | ); \ |
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| 305 | _value = __value; \ |
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| 306 | } |
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| 307 | |
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| 308 | #define i386_inport_long( _port, _value ) \ |
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| 309 | { register unsigned short __port = _port; \ |
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| 310 | register unsigned int __value = 0; \ |
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| 311 | \ |
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| 312 | asm volatile ( "inl %1,%0" : "=a" (__value), "=d" (__port) \ |
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| 313 | : "0" (__value), "1" (__port) \ |
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| 314 | ); \ |
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| 315 | _value = __value; \ |
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| 316 | } |
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| 317 | |
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| 318 | /* |
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| 319 | * Descriptor Table helper routines |
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| 320 | */ |
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| 321 | |
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| 322 | |
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| 323 | #define i386_get_GDTR( _gdtr_address ) \ |
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| 324 | { \ |
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| 325 | void *_gdtr = (_gdtr_address); \ |
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| 326 | \ |
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| 327 | asm volatile( "sgdt (%0)" : "=r" (_gdtr) : "0" (_gdtr) ); \ |
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| 328 | } |
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| 329 | |
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| 330 | #define i386_get_GDT_slot( _gdtr_base, _segment, _slot_address ) \ |
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| 331 | { \ |
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| 332 | register unsigned int _gdt_slot = (_gdtr_base) + (_segment); \ |
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| 333 | register volatile void *_slot = (_slot_address); \ |
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| 334 | register unsigned int _temporary = 0; \ |
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| 335 | \ |
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| 336 | asm volatile( "movl %%gs:(%0),%1 ; \ |
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| 337 | movl %1,(%2) ; \ |
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| 338 | movl %%gs:4(%0),%1 ; \ |
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| 339 | movl %1,4(%2)" \ |
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| 340 | : "=r" (_gdt_slot), "=r" (_temporary), "=r" (_slot) \ |
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| 341 | : "0" (_gdt_slot), "1" (_temporary), "2" (_slot) \ |
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| 342 | ); \ |
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| 343 | } |
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| 344 | |
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| 345 | #define i386_set_GDT_slot( _gdtr_base, _segment, _slot_address ) \ |
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| 346 | { \ |
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| 347 | register unsigned int _gdt_slot = (_gdtr_base) + (_segment); \ |
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| 348 | register volatile void *_slot = (_slot_address); \ |
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| 349 | register unsigned int _temporary = 0; \ |
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| 350 | \ |
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| 351 | asm volatile( "movl (%2),%1 ; \ |
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| 352 | movl %1,%%gs:(%0) ; \ |
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| 353 | movl 4(%2),%1 ; \ |
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| 354 | movl %1,%%gs:4(%0) \ |
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| 355 | " \ |
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| 356 | : "=r" (_gdt_slot), "=r" (_temporary), "=r" (_slot) \ |
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| 357 | : "0" (_gdt_slot), "1" (_temporary), "2" (_slot) \ |
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| 358 | ); \ |
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| 359 | } |
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| 360 | |
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| 361 | static inline void i386_set_segment( |
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| 362 | unsigned short segment, |
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| 363 | unsigned int base, |
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| 364 | unsigned int limit |
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| 365 | ) |
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| 366 | { |
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| 367 | i386_DTR_load_save_format gdtr; |
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| 368 | volatile i386_GDT_slot Gdt_slot; |
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| 369 | volatile i386_GDT_slot *gdt_slot = &Gdt_slot; |
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| 370 | unsigned short tmp_segment = 0; |
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| 371 | unsigned int limit_adjusted; |
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| 372 | |
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| 373 | /* load physical address of the GDT */ |
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| 374 | |
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| 375 | i386_get_GDTR( &gdtr ); |
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| 376 | |
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| 377 | gdt_slot->type_dt_dpl_p = 0x92; /* present, dpl=0, */ |
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| 378 | /* application=1, */ |
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| 379 | /* type=data read/write */ |
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| 380 | gdt_slot->limit_16_19_granularity = 0x40; /* 32 bit segment */ |
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| 381 | |
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| 382 | limit_adjusted = limit; |
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| 383 | if ( limit > 4095 ) { |
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| 384 | gdt_slot->limit_16_19_granularity |= 0x80; /* set granularity bit */ |
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| 385 | limit_adjusted /= 4096; |
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| 386 | } |
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| 387 | |
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| 388 | gdt_slot->limit_16_19_granularity |= (limit_adjusted >> 16) & 0xff; |
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| 389 | gdt_slot->limit_0_15 = limit_adjusted & 0xffff; |
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| 390 | |
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| 391 | gdt_slot->base_0_15 = base & 0xffff; |
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| 392 | gdt_slot->base_16_23 = (base >> 16) & 0xff; |
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| 393 | gdt_slot->base_24_31 = (base >> 24); |
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| 394 | |
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| 395 | i386_set_GDT_slot( |
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| 396 | gdtr.physical_address[0] + (gdtr.physical_address[1] << 16), |
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| 397 | segment, |
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| 398 | gdt_slot |
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| 399 | ); |
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| 400 | |
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| 401 | /* Now, reload all segment registers so the limit takes effect. */ |
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| 402 | |
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| 403 | asm volatile( "movw %%ds,%0 ; movw %0,%%ds |
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| 404 | movw %%es,%0 ; movw %0,%%es |
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| 405 | movw %%fs,%0 ; movw %0,%%fs |
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| 406 | movw %%gs,%0 ; movw %0,%%gs |
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| 407 | movw %%ss,%0 ; movw %0,%%ss" |
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| 408 | : "=r" (tmp_segment) |
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| 409 | : "0" (tmp_segment) |
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| 410 | ); |
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| 411 | |
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| 412 | } |
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| 413 | |
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| 414 | /* routines */ |
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| 415 | |
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| 416 | /* |
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| 417 | * i386_Logical_to_physical |
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| 418 | * |
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| 419 | * Converts logical address to physical address. |
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| 420 | */ |
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| 421 | |
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| 422 | void *i386_Logical_to_physical( |
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| 423 | unsigned short segment, |
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| 424 | void *address |
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| 425 | ); |
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| 426 | |
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| 427 | /* |
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| 428 | * i386_Physical_to_logical |
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| 429 | * |
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| 430 | * Converts physical address to logical address. |
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| 431 | */ |
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| 432 | |
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| 433 | void *i386_Physical_to_logical( |
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| 434 | unsigned short segment, |
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| 435 | void *address |
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| 436 | ); |
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| 437 | |
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| 438 | /* |
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| 439 | * i386_Install_idt |
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| 440 | * |
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| 441 | * This routine installs an IDT entry. |
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| 442 | */ |
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| 443 | |
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| 444 | void i386_Install_idt( |
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| 445 | unsigned int source_offset, |
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| 446 | unsigned short destination_segment, |
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| 447 | unsigned int destination_offset |
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| 448 | ); |
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| 449 | |
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| 450 | /* |
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| 451 | * "Simpler" names for a lot of the things defined in this file |
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| 452 | */ |
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| 453 | |
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| 454 | /* segment access routines */ |
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| 455 | |
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| 456 | #define get_cs() i386_get_cs() |
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| 457 | #define get_ds() i386_get_ds() |
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| 458 | #define get_es() i386_get_es() |
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| 459 | #define get_ss() i386_get_ss() |
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| 460 | #define get_fs() i386_get_fs() |
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| 461 | #define get_gs() i386_get_gs() |
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| 462 | |
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| 463 | #define CPU_swap_u32( _value ) i386_swap_U32( _value ) |
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| 464 | |
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| 465 | /* i80x86 I/O instructions */ |
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| 466 | |
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| 467 | #define outport_byte( _port, _value ) i386_outport_byte( _port, _value ) |
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| 468 | #define outport_word( _port, _value ) i386_outport_word( _port, _value ) |
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| 469 | #define outport_long( _port, _value ) i386_outport_long( _port, _value ) |
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| 470 | #define inport_byte( _port, _value ) i386_inport_byte( _port, _value ) |
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| 471 | #define inport_word( _port, _value ) i386_inport_word( _port, _value ) |
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| 472 | #define inport_long( _port, _value ) i386_inport_long( _port, _value ) |
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| 473 | |
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| 474 | /* complicated static inline functions */ |
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| 475 | |
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| 476 | #define get_GDTR( _gdtr_address ) \ |
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| 477 | i386_get_GDTR( _gdtr_address ) |
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| 478 | |
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| 479 | #define get_GDT_slot( _gdtr_base, _segment, _slot_address ) \ |
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| 480 | i386_get_GDT_slot( _gdtr_base, _segment, _slot_address ) |
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| 481 | |
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| 482 | #define set_GDT_slot( _gdtr_base, _segment, _slot_address ) \ |
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| 483 | i386_set_GDT_slot( _gdtr_base, _segment, _slot_address ) |
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| 484 | |
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| 485 | #define set_segment( _segment, _base, _limit ) \ |
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| 486 | i386_set_segment( _segment, _base, _limit ) |
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| 487 | |
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| 488 | |
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| 489 | #ifdef __cplusplus |
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| 490 | } |
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| 491 | #endif |
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| 492 | |
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| 493 | #endif /* !ASM */ |
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| 494 | |
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| 495 | #endif |
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| 496 | /* end of include file */ |
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