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  * 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  * Copyright (c) 1992 NeXT Computer, Inc.
  24  *
  25  * Intel386 Family:     Task State Segment.
  26  *
  27  * HISTORY
  28  *
  29  * 29 March 1992 ? at NeXT
  30  *      Created.
  31  */
  32
  33 #include <architecture/i386/sel.h>
  34
  35 /*
  36  * Task State segment.
  37  */
  38
  39 typedef struct tss {
  40     sel_t               oldtss;
  41     unsigned int                :0;
  42     unsigned int        esp0;
  43     sel_t               ss0;
  44     unsigned int                :0;
  45     unsigned int        esp1;
  46     sel_t               ss1;
  47     unsigned int                :0;
  48     unsigned int        esp2;
  49     sel_t               ss2;
  50     unsigned int                :0;
  51     unsigned int        cr3;
  52     unsigned int        eip;
  53     unsigned int        eflags;
  54     unsigned int        eax;
  55     unsigned int        ecx;
  56     unsigned int        edx;
  57     unsigned int        ebx;
  58     unsigned int        esp;
  59     unsigned int        ebp;
  60     unsigned int        esi;
  61     unsigned int        edi;
  62     sel_t               es;
  63     unsigned int                :0;
  64     sel_t               cs;
  65     unsigned int                :0;
  66     sel_t               ss;
  67     unsigned int                :0;
  68     sel_t               ds;
  69     unsigned int                :0;
  70     sel_t               fs;
  71     unsigned int                :0;
  72     sel_t               gs;
  73     unsigned int                :0;
  74     sel_t               ldt;
  75     unsigned int                :0;
  76     unsigned int        t       :1,
  77                                 :15,
  78                         io_bmap :16;
  79 } tss_t;
  80
  81 #define TSS_SIZE(n)     (sizeof (struct tss) + (n))
  82
  83 /*
  84  * Task State segment descriptor.
  85  */
  86
  87 typedef struct tss_desc {
  88     unsigned short      limit00;
  89     unsigned short      base00;
  90     unsigned char       base16;
  91     unsigned char       type    :5,
  92 #define DESC_TSS        0x09
  93                         dpl     :2,
  94                         present :1;
  95     unsigned char       limit16 :4,
  96                                 :3,
  97                         granular:1;
  98     unsigned char       base24;
  99 } tss_desc_t;
 100
 101 /*
 102  * Task gate descriptor.
 103  */
 104
 105 typedef struct task_gate {
 106     unsigned short              :16;
 107     sel_t               tss;
 108     unsigned int                :8,
 109                         type    :5,
 110 #define DESC_TASK_GATE  0x05
 111                         dpl     :2,
 112                         present :1,
 113                                 :0;
 114 } task_gate_t;