osfmk/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  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990,1989 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52
  53 #ifndef _I386_TSS_H_
  54 #define _I386_TSS_H_
  55
  56 /*
  57  *      i386 Task State Segment
  58  */
  59 struct i386_tss {
  60         int             back_link;      /* segment number of previous task,
  61                                            if nested */
  62         int             esp0;           /* initial stack pointer ... */
  63         int             ss0;            /* and segment for ring 0 */
  64         int             esp1;           /* initial stack pointer ... */
  65         int             ss1;            /* and segment for ring 1 */
  66         int             esp2;           /* initial stack pointer ... */
  67         int             ss2;            /* and segment for ring 2 */
  68         int             cr3;            /* CR3 - page table directory
  69                                                  physical address */
  70         int             eip;
  71         int             eflags;
  72         int             eax;
  73         int             ecx;
  74         int             edx;
  75         int             ebx;
  76         int             esp;            /* current stack pointer */
  77         int             ebp;
  78         int             esi;
  79         int             edi;
  80         int             es;
  81         int             cs;
  82         int             ss;             /* current stack segment */
  83         int             ds;
  84         int             fs;
  85         int             gs;
  86         int             ldt;            /* local descriptor table segment */
  87         unsigned short  trace_trap;     /* trap on switch to this task */
  88         unsigned short  io_bit_map_offset;
  89                                         /* offset to start of IO permission
  90                                            bit map */
  91 };
  92
  93 #endif  /* _I386_TSS_H_ */