osfmk/i386/ktss.c

   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  * @OSF_COPYRIGHT@
  25  */
  26 /*
  27  * Mach Operating System
  28  * Copyright (c) 1991,1990 Carnegie Mellon University
  29  * All Rights Reserved.
  30  *
  31  * Permission to use, copy, modify and distribute this software and its
  32  * documentation is hereby granted, provided that both the copyright
  33  * notice and this permission notice appear in all copies of the
  34  * software, derivative works or modified versions, and any portions
  35  * thereof, and that both notices appear in supporting documentation.
  36  *
  37  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  38  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  39  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  40  *
  41  * Carnegie Mellon requests users of this software to return to
  42  *
  43  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  44  *  School of Computer Science
  45  *  Carnegie Mellon University
  46  *  Pittsburgh PA 15213-3890
  47  *
  48  * any improvements or extensions that they make and grant Carnegie Mellon
  49  * the rights to redistribute these changes.
  50  */
  51 /*
  52  */
  53
  54 /*
  55  * Kernel task state segment.
  56  *
  57  * We don't use the i386 task switch mechanism.  We need a TSS
  58  * only to hold the kernel stack pointer for the current thread.
  59  *
  60  * XXX multiprocessor??
  61  */
  62 #include <i386/tss.h>
  63 #include <i386/seg.h>
  64 #include <mach_kdb.h>
  65
  66 struct i386_tss ktss = {
  67         0,                              /* back link */
  68         0,                              /* esp0 */
  69         KERNEL_DS,                      /* ss0 */
  70         0,                              /* esp1 */
  71         0,                              /* ss1 */
  72         0,                              /* esp2 */
  73         0,                              /* ss2 */
  74         0,                              /* cr3 */
  75         0,                              /* eip */
  76         0,                              /* eflags */
  77         0,                              /* eax */
  78         0,                              /* ecx */
  79         0,                              /* edx */
  80         0,                              /* ebx */
  81         0,                              /* esp */
  82         0,                              /* ebp */
  83         0,                              /* esi */
  84         0,                              /* edi */
  85         0,                              /* es */
  86         0,                              /* cs */
  87         0,                              /* ss */
  88         0,                              /* ds */
  89         0,                              /* fs */
  90         0,                              /* gs */
  91         KERNEL_LDT,                     /* ldt */
  92         0,                              /* trace_trap */
  93         0x0FFF                          /* IO bitmap offset -
  94                                            beyond end of TSS segment,
  95                                            so no bitmap */
  96 };
  97
  98 #if     MACH_KDB
  99
 100 struct i386_tss dbtss = {
 101         0,                              /* back link */
 102         0,                              /* esp0 */
 103         KERNEL_DS,                      /* ss0 */
 104         0,                              /* esp1 */
 105         0,                              /* ss1 */
 106         0,                              /* esp2 */
 107         0,                              /* ss2 */
 108         0,                              /* cr3 */
 109         0,                              /* eip */
 110         0,                              /* eflags */
 111         0,                              /* eax */
 112         0,                              /* ecx */
 113         0,                              /* edx */
 114         0,                              /* ebx */
 115         0,                              /* esp */
 116         0,                              /* ebp */
 117         0,                              /* esi */
 118         0,                              /* edi */
 119         KERNEL_DS,                      /* es */
 120         KERNEL_CS,                      /* cs */
 121         KERNEL_DS,                      /* ss */
 122         KERNEL_DS,                      /* ds */
 123         KERNEL_DS,                      /* fs */
 124         KERNEL_DS,                      /* gs */
 125         KERNEL_LDT,                     /* ldt */
 126         0,                              /* trace_trap */
 127         0x0FFF                          /* IO bitmap offset -
 128                                            beyond end of TSS segment,
 129                                            so no bitmap */
 130 };
 131
 132 #endif  /* MACH_KDB */