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