EXTERNAL_HEADERS/architecture/i386/tss.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1992 NeXT Computer, Inc.
  27  *
  28  * Intel386 Family:     Task State Segment.
  29  *
  30  * HISTORY
  31  *
  32  * 29 March 1992 ? at NeXT
  33  *      Created.
  34  */
  35
  36 #include <architecture/i386/sel.h>
  37
  38 /*
  39  * Task State segment.
  40  */
  41
  42 typedef struct tss {
  43     sel_t               oldtss;
  44     unsigned int                :0;
  45     unsigned int        esp0;
  46     sel_t               ss0;
  47     unsigned int                :0;
  48     unsigned int        esp1;
  49     sel_t               ss1;
  50     unsigned int                :0;
  51     unsigned int        esp2;
  52     sel_t               ss2;
  53     unsigned int                :0;
  54     unsigned int        cr3;
  55     unsigned int        eip;
  56     unsigned int        eflags;
  57     unsigned int        eax;
  58     unsigned int        ecx;
  59     unsigned int        edx;
  60     unsigned int        ebx;
  61     unsigned int        esp;
  62     unsigned int        ebp;
  63     unsigned int        esi;
  64     unsigned int        edi;
  65     sel_t               es;
  66     unsigned int                :0;
  67     sel_t               cs;
  68     unsigned int                :0;
  69     sel_t               ss;
  70     unsigned int                :0;
  71     sel_t               ds;
  72     unsigned int                :0;
  73     sel_t               fs;
  74     unsigned int                :0;
  75     sel_t               gs;
  76     unsigned int                :0;
  77     sel_t               ldt;
  78     unsigned int                :0;
  79     unsigned int        t       :1,
  80                                 :15,
  81                         io_bmap :16;
  82 } tss_t;
  83
  84 #define TSS_SIZE(n)     (sizeof (struct tss) + (n))
  85
  86 /*
  87  * Task State segment descriptor.
  88  */
  89
  90 typedef struct tss_desc {
  91     unsigned short      limit00;
  92     unsigned short      base00;
  93     unsigned char       base16;
  94     unsigned char       type    :5,
  95 #define DESC_TSS        0x09
  96                         dpl     :2,
  97                         present :1;
  98     unsigned char       limit16 :4,
  99                                 :3,
 100                         granular:1;
 101     unsigned char       base24;
 102 } tss_desc_t;
 103
 104 /*
 105  * Task gate descriptor.
 106  */
 107
 108 typedef struct task_gate {
 109     unsigned short              :16;
 110     sel_t               tss;
 111     unsigned int                :8,
 112                         type    :5,
 113 #define DESC_TASK_GATE  0x05
 114                         dpl     :2,
 115                         present :1,
 116                                 :0;
 117 } task_gate_t;