projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c79356b A |
1 | /* |
| 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. | |
| 3 | * | |
| 6601e61a | 4 | * @APPLE_LICENSE_HEADER_START@ |
| 1c79356b | 5 | * |
| 6601e61a A |
6 | * The contents of this file constitute Original Code as defined in and |
| 7 | * are subject to the Apple Public Source License Version 1.1 (the | |
| 8 | * "License"). You may not use this file except in compliance with the | |
| 9 | * License. Please obtain a copy of the License at | |
| 10 | * http://www.apple.com/publicsource and read it before using this file. | |
| 8f6c56a5 | 11 | * |
| 6601e61a A |
12 | * This Original Code and all software distributed under the License are |
| 13 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER | |
| 8f6c56a5 A |
14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, | |
| 6601e61a A |
16 | * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the |
| 17 | * License for the specific language governing rights and limitations | |
| 18 | * under the License. | |
| 8f6c56a5 | 19 | * |
| 6601e61a | 20 | * @APPLE_LICENSE_HEADER_END@ |
| 1c79356b A |
21 | */ |
| 22 | /* | |
| 23 | * Copyright (c) 1992 NeXT Computer, Inc. | |
| 24 | * | |
| 25 | * Intel386 Family: Segment descriptors. | |
| 26 | * | |
| 27 | * HISTORY | |
| 28 | * | |
| 29 | * 29 March 1992 ? at NeXT | |
| 30 | * Created. | |
| 31 | */ | |
| 32 | ||
| 33 | /* | |
| 34 | * Code segment descriptor. | |
| 35 | */ | |
| 36 | ||
| 37 | typedef struct code_desc { | |
| 38 | unsigned short limit00; | |
| 39 | unsigned short base00; | |
| 40 | unsigned char base16; | |
| 41 | unsigned char type :5, | |
| 42 | #define DESC_CODE_EXEC 0x18 | |
| 43 | #define DESC_CODE_READ 0x1a | |
| 44 | dpl :2, | |
| 45 | present :1; | |
| 46 | unsigned char limit16 :4, | |
| 47 | :2, | |
| 48 | opsz :1, | |
| 49 | #define DESC_CODE_16B 0 | |
| 50 | #define DESC_CODE_32B 1 | |
| 51 | granular:1; | |
| 52 | #define DESC_GRAN_BYTE 0 | |
| 53 | #define DESC_GRAN_PAGE 1 | |
| 54 | unsigned char base24; | |
| 55 | } code_desc_t; | |
| 56 | ||
| 57 | /* | |
| 58 | * Data segment descriptor. | |
| 59 | */ | |
| 60 | ||
| 61 | typedef struct data_desc { | |
| 62 | unsigned short limit00; | |
| 63 | unsigned short base00; | |
| 64 | unsigned char base16; | |
| 65 | unsigned char type :5, | |
| 66 | #define DESC_DATA_RONLY 0x10 | |
| 67 | #define DESC_DATA_WRITE 0x12 | |
| 68 | dpl :2, | |
| 69 | present :1; | |
| 70 | unsigned char limit16 :4, | |
| 71 | :2, | |
| 72 | stksz :1, | |
| 73 | #define DESC_DATA_16B 0 | |
| 74 | #define DESC_DATA_32B 1 | |
| 75 | granular:1; | |
| 76 | unsigned char base24; | |
| 77 | } data_desc_t; | |
| 78 | ||
| 79 | /* | |
| 80 | * LDT segment descriptor. | |
| 81 | */ | |
| 82 | ||
| 83 | typedef struct ldt_desc { | |
| 84 | unsigned short limit00; | |
| 85 | unsigned short base00; | |
| 86 | unsigned char base16; | |
| 87 | unsigned char type :5, | |
| 88 | #define DESC_LDT 0x02 | |
| 89 | :2, | |
| 90 | present :1; | |
| 91 | unsigned char limit16 :4, | |
| 92 | :3, | |
| 93 | granular:1; | |
| 94 | unsigned char base24; | |
| 95 | } ldt_desc_t; | |
| 96 | ||
| 97 | #include <architecture/i386/sel.h> | |
| 98 | ||
| 99 | /* | |
| 100 | * Call gate descriptor. | |
| 101 | */ | |
| 102 | ||
| 103 | typedef struct call_gate { | |
| 104 | unsigned short offset00; | |
| 105 | sel_t seg; | |
| 106 | unsigned int argcnt :5, | |
| 107 | :3, | |
| 108 | type :5, | |
| 109 | #define DESC_CALL_GATE 0x0c | |
| 110 | dpl :2, | |
| 111 | present :1, | |
| 112 | offset16:16; | |
| 113 | } call_gate_t; | |
| 114 | ||
| 115 | /* | |
| 116 | * Trap gate descriptor. | |
| 117 | */ | |
| 118 | ||
| 119 | typedef struct trap_gate { | |
| 120 | unsigned short offset00; | |
| 121 | sel_t seg; | |
| 122 | unsigned int :8, | |
| 123 | type :5, | |
| 124 | #define DESC_TRAP_GATE 0x0f | |
| 125 | dpl :2, | |
| 126 | present :1, | |
| 127 | offset16:16; | |
| 128 | } trap_gate_t; | |
| 129 | ||
| 130 | ||
| 131 | /* | |
| 132 | * Interrupt gate descriptor. | |
| 133 | */ | |
| 134 | ||
| 135 | typedef struct intr_gate { | |
| 136 | unsigned short offset00; | |
| 137 | sel_t seg; | |
| 138 | unsigned int :8, | |
| 139 | type :5, | |
| 140 | #define DESC_INTR_GATE 0x0e | |
| 141 | dpl :2, | |
| 142 | present :1, | |
| 143 | offset16:16; | |
| 144 | } intr_gate_t; |