osfmk/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  * @OSF_COPYRIGHT@
  27  */
  28 /*
  29  * Mach Operating System
  30  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  31  * All Rights Reserved.
  32  *
  33  * Permission to use, copy, modify and distribute this software and its
  34  * documentation is hereby granted, provided that both the copyright
  35  * notice and this permission notice appear in all copies of the
  36  * software, derivative works or modified versions, and any portions
  37  * thereof, and that both notices appear in supporting documentation.
  38  *
  39  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  40  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  41  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  42  *
  43  * Carnegie Mellon requests users of this software to return to
  44  *
  45  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  46  *  School of Computer Science
  47  *  Carnegie Mellon University
  48  *  Pittsburgh PA 15213-3890
  49  *
  50  * any improvements or extensions that they make and grant Carnegie Mellon
  51  * the rights to redistribute these changes.
  52  */
  53 /*
  54  */
  55
  56 #ifndef _I386_TSS_H_
  57 #define _I386_TSS_H_
  58
  59 /*
  60  *      i386 Task State Segment
  61  */
  62 struct i386_tss {
  63         int             back_link;      /* segment number of previous task,
  64                                            if nested */
  65         int             esp0;           /* initial stack pointer ... */
  66         int             ss0;            /* and segment for ring 0 */
  67         int             esp1;           /* initial stack pointer ... */
  68         int             ss1;            /* and segment for ring 1 */
  69         int             esp2;           /* initial stack pointer ... */
  70         int             ss2;            /* and segment for ring 2 */
  71         int             cr3;            /* CR3 - page table directory
  72                                                  physical address */
  73         int             eip;
  74         int             eflags;
  75         int             eax;
  76         int             ecx;
  77         int             edx;
  78         int             ebx;
  79         int             esp;            /* current stack pointer */
  80         int             ebp;
  81         int             esi;
  82         int             edi;
  83         int             es;
  84         int             cs;
  85         int             ss;             /* current stack segment */
  86         int             ds;
  87         int             fs;
  88         int             gs;
  89         int             ldt;            /* local descriptor table segment */
  90         unsigned short  trace_trap;     /* trap on switch to this task */
  91         unsigned short  io_bit_map_offset;
  92                                         /* offset to start of IO permission
  93                                            bit map */
  94 };
  95
  96 #endif  /* _I386_TSS_H_ */