1 /* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* 29 * Copyright (c) 1992 NeXT Computer, Inc. 30 * 31 * Intel386 Family: Task State Segment. 32 * 33 * HISTORY 34 * 35 * 29 March 1992 ? at NeXT 36 * Created. 37 */ 38 39 #include <architecture/i386/sel.h> 40 41 /* 42 * Task State segment. 43 */ 44 45 typedef struct tss { 46 sel_t oldtss; 47 unsigned int :0; 48 unsigned int esp0; 49 sel_t ss0; 50 unsigned int :0; 51 unsigned int esp1; 52 sel_t ss1; 53 unsigned int :0; 54 unsigned int esp2; 55 sel_t ss2; 56 unsigned int :0; 57 unsigned int cr3; 58 unsigned int eip; 59 unsigned int eflags; 60 unsigned int eax; 61 unsigned int ecx; 62 unsigned int edx; 63 unsigned int ebx; 64 unsigned int esp; 65 unsigned int ebp; 66 unsigned int esi; 67 unsigned int edi; 68 sel_t es; 69 unsigned int :0; 70 sel_t cs; 71 unsigned int :0; 72 sel_t ss; 73 unsigned int :0; 74 sel_t ds; 75 unsigned int :0; 76 sel_t fs; 77 unsigned int :0; 78 sel_t gs; 79 unsigned int :0; 80 sel_t ldt; 81 unsigned int :0; 82 unsigned int t :1, 83 :15, 84 io_bmap :16; 85 } tss_t; 86 87 #define TSS_SIZE(n) (sizeof (struct tss) + (n)) 88 89 /* 90 * Task State segment descriptor. 91 */ 92 93 typedef struct tss_desc { 94 unsigned short limit00; 95 unsigned short base00; 96 unsigned char base16; 97 unsigned char type :5, 98 #define DESC_TSS 0x09 99 dpl :2, 100 present :1; 101 unsigned char limit16 :4, 102 :3, 103 granular:1; 104 unsigned char base24; 105 } tss_desc_t; 106 107 /* 108 * Task gate descriptor. 109 */ 110 111 typedef struct task_gate { 112 unsigned short :16; 113 sel_t tss; 114 unsigned int :8, 115 type :5, 116 #define DESC_TASK_GATE 0x05 117 dpl :2, 118 present :1, 119 :0; 120 } task_gate_t; 121