| | 1 | /* |
| | 2 | * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. |
| | 3 | * |
| | 4 | * @APPLE_LICENSE_HEADER_START@ |
| | 5 | * |
| | 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. |
| | 11 | * |
| | 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 |
| | 14 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
| | 15 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
| | 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. |
| | 19 | * |
| | 20 | * @APPLE_LICENSE_HEADER_END@ |
| | 21 | */ |
| | 22 | /* |
| | 23 | * @OSF_COPYRIGHT@ |
| | 24 | */ |
| | 25 | /* |
| | 26 | * Mach Operating System |
| | 27 | * Copyright (c) 1991,1990 Carnegie Mellon University |
| | 28 | * All Rights Reserved. |
| | 29 | * |
| | 30 | * Permission to use, copy, modify and distribute this software and its |
| | 31 | * documentation is hereby granted, provided that both the copyright |
| | 32 | * notice and this permission notice appear in all copies of the |
| | 33 | * software, derivative works or modified versions, and any portions |
| | 34 | * thereof, and that both notices appear in supporting documentation. |
| | 35 | * |
| | 36 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| | 37 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR |
| | 38 | * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| | 39 | * |
| | 40 | * Carnegie Mellon requests users of this software to return to |
| | 41 | * |
| | 42 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| | 43 | * School of Computer Science |
| | 44 | * Carnegie Mellon University |
| | 45 | * Pittsburgh PA 15213-3890 |
| | 46 | * |
| | 47 | * any improvements or extensions that they make and grant Carnegie Mellon |
| | 48 | * the rights to redistribute these changes. |
| | 49 | */ |
| | 50 | /* |
| | 51 | */ |
| | 52 | |
| | 53 | #ifndef _I386_SEG_H_ |
| | 54 | #define _I386_SEG_H_ |
| | 55 | #include <mach_kdb.h> |
| | 56 | |
| | 57 | /* |
| | 58 | * i386 segmentation. |
| | 59 | */ |
| | 60 | |
| | 61 | #ifndef __ASSEMBLER__ |
| | 62 | /* |
| | 63 | * Real segment descriptor. |
| | 64 | */ |
| | 65 | struct real_descriptor { |
| | 66 | unsigned int limit_low:16, /* limit 0..15 */ |
| | 67 | base_low:16, /* base 0..15 */ |
| | 68 | base_med:8, /* base 16..23 */ |
| | 69 | access:8, /* access byte */ |
| | 70 | limit_high:4, /* limit 16..19 */ |
| | 71 | granularity:4, /* granularity */ |
| | 72 | base_high:8; /* base 24..31 */ |
| | 73 | }; |
| | 74 | |
| | 75 | struct real_gate { |
| | 76 | unsigned int offset_low:16, /* offset 0..15 */ |
| | 77 | selector:16, |
| | 78 | word_count:8, |
| | 79 | access:8, |
| | 80 | offset_high:16; /* offset 16..31 */ |
| | 81 | }; |
| | 82 | |
| | 83 | /* |
| | 84 | * We build descriptors and gates in a 'fake' format to let the |
| | 85 | * fields be contiguous. We shuffle them into the real format |
| | 86 | * at runtime. |
| | 87 | */ |
| | 88 | struct fake_descriptor { |
| | 89 | unsigned int offset:32; /* offset */ |
| | 90 | unsigned int lim_or_seg:20; /* limit */ |
| | 91 | /* or segment, for gate */ |
| | 92 | unsigned int size_or_wdct:4; /* size/granularity */ |
| | 93 | /* word count, for gate */ |
| | 94 | unsigned int access:8; /* access */ |
| | 95 | }; |
| | 96 | #endif /*__ASSEMBLER__*/ |
| | 97 | |
| | 98 | #define SZ_32 0x4 /* 32-bit segment */ |
| | 99 | #define SZ_G 0x8 /* 4K limit field */ |
| | 100 | |
| | 101 | #define ACC_A 0x01 /* accessed */ |
| | 102 | #define ACC_TYPE 0x1e /* type field: */ |
| | 103 | |
| | 104 | #define ACC_TYPE_SYSTEM 0x00 /* system descriptors: */ |
| | 105 | |
| | 106 | #define ACC_LDT 0x02 /* LDT */ |
| | 107 | #define ACC_CALL_GATE_16 0x04 /* 16-bit call gate */ |
| | 108 | #define ACC_TASK_GATE 0x05 /* task gate */ |
| | 109 | #define ACC_TSS 0x09 /* task segment */ |
| | 110 | #define ACC_CALL_GATE 0x0c /* call gate */ |
| | 111 | #define ACC_INTR_GATE 0x0e /* interrupt gate */ |
| | 112 | #define ACC_TRAP_GATE 0x0f /* trap gate */ |
| | 113 | |
| | 114 | #define ACC_TSS_BUSY 0x02 /* task busy */ |
| | 115 | |
| | 116 | #define ACC_TYPE_USER 0x10 /* user descriptors */ |
| | 117 | |
| | 118 | #define ACC_DATA 0x10 /* data */ |
| | 119 | #define ACC_DATA_W 0x12 /* data, writable */ |
| | 120 | #define ACC_DATA_E 0x14 /* data, expand-down */ |
| | 121 | #define ACC_DATA_EW 0x16 /* data, expand-down, |
| | 122 | writable */ |
| | 123 | #define ACC_CODE 0x18 /* code */ |
| | 124 | #define ACC_CODE_R 0x1a /* code, readable */ |
| | 125 | #define ACC_CODE_C 0x1c /* code, conforming */ |
| | 126 | #define ACC_CODE_CR 0x1e /* code, conforming, |
| | 127 | readable */ |
| | 128 | #define ACC_PL 0x60 /* access rights: */ |
| | 129 | #define ACC_PL_K 0x00 /* kernel access only */ |
| | 130 | #define ACC_PL_U 0x60 /* user access */ |
| | 131 | #define ACC_P 0x80 /* segment present */ |
| | 132 | |
| | 133 | /* |
| | 134 | * Components of a selector |
| | 135 | */ |
| | 136 | #define SEL_LDTS 0x04 /* local selector */ |
| | 137 | #define SEL_PL 0x03 /* privilege level: */ |
| | 138 | #define SEL_PL_K 0x00 /* kernel selector */ |
| | 139 | #define SEL_PL_U 0x03 /* user selector */ |
| | 140 | |
| | 141 | /* |
| | 142 | * Convert selector to descriptor table index. |
| | 143 | */ |
| | 144 | #define sel_idx(sel) ((sel)>>3) |
| | 145 | |
| | 146 | /* |
| | 147 | * User descriptors for MACH - 32-bit flat address space |
| | 148 | */ |
| | 149 | #define USER_SCALL 0x07 /* system call gate */ |
| | 150 | #define USER_RPC 0x0f /* mach rpc call gate */ |
| | 151 | #define USER_CS 0x17 /* user code segment */ |
| | 152 | #define USER_DS 0x1f /* user data segment */ |
| | 153 | |
| | 154 | #define LDTSZ 4 |
| | 155 | |
| | 156 | /* |
| | 157 | * Kernel descriptors for MACH - 32-bit flat address space. |
| | 158 | */ |
| | 159 | #define KERNEL_CS 0x08 /* kernel code */ |
| | 160 | #define KERNEL_DS 0x10 /* kernel data */ |
| | 161 | #define KERNEL_LDT 0x18 /* master LDT */ |
| | 162 | #define KERNEL_TSS 0x20 /* master TSS (uniprocessor) */ |
| | 163 | #ifdef MACH_BSD |
| | 164 | #define BSD_SCALL_SEL 0x28 /* BSD System calls */ |
| | 165 | #define MK25_SCALL_SEL 0x30 /* MK25 System Calls */ |
| | 166 | #define MACHDEP_SCALL_SEL 0x38 /* Machdep SYstem calls */ |
| | 167 | #else |
| | 168 | #define USER_LDT 0x28 /* place for per-thread LDT */ |
| | 169 | #define USER_TSS 0x30 /* place for per-thread TSS |
| | 170 | that holds IO bitmap */ |
| | 171 | #define FPE_CS 0x38 /* floating-point emulator code */ |
| | 172 | #endif |
| | 173 | #define USER_FPREGS 0x40 /* user-mode access to saved |
| | 174 | floating-point registers */ |
| | 175 | #define CPU_DATA 0x48 /* per-cpu data */ |
| | 176 | |
| | 177 | #ifdef MACH_BSD |
| | 178 | #define USER_LDT 0x58 |
| | 179 | #define USER_TSS 0x60 |
| | 180 | #define FPE_CS 0x68 |
| | 181 | #endif |
| | 182 | |
| | 183 | #if MACH_KDB |
| | 184 | #define DEBUG_TSS 0x50 /* debug TSS (uniprocessor) */ |
| | 185 | |
| | 186 | #ifdef MACH_BSD |
| | 187 | #define GDTSZ 14 |
| | 188 | #else |
| | 189 | #define GDTSZ 11 |
| | 190 | #endif |
| | 191 | #else |
| | 192 | |
| | 193 | #ifdef MACH_BSD |
| | 194 | #define GDTSZ 13 |
| | 195 | #else |
| | 196 | #define GDTSZ 10 |
| | 197 | #endif |
| | 198 | #endif |
| | 199 | |
| | 200 | /* |
| | 201 | * Interrupt table is always 256 entries long. |
| | 202 | */ |
| | 203 | #define IDTSZ 256 |
| | 204 | |
| | 205 | #endif /* _I386_SEG_H_ */ |
projects / apple / xnu.git / blame_incremental