EXTERNAL_HEADERS/architecture/i386/tss.h

   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;