osfmk/i386/ktss.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33 /*
  34  * Mach Operating System
  35  * Copyright (c) 1991,1990 Carnegie Mellon University
  36  * All Rights Reserved.
  37  *
  38  * Permission to use, copy, modify and distribute this software and its
  39  * documentation is hereby granted, provided that both the copyright
  40  * notice and this permission notice appear in all copies of the
  41  * software, derivative works or modified versions, and any portions
  42  * thereof, and that both notices appear in supporting documentation.
  43  *
  44  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  45  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  46  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  47  *
  48  * Carnegie Mellon requests users of this software to return to
  49  *
  50  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  51  *  School of Computer Science
  52  *  Carnegie Mellon University
  53  *  Pittsburgh PA 15213-3890
  54  *
  55  * any improvements or extensions that they make and grant Carnegie Mellon
  56  * the rights to redistribute these changes.
  57  */
  58 /*
  59  */
  60
  61 /*
  62  * Kernel task state segment.
  63  *
  64  * We don't use the i386 task switch mechanism.  We need a TSS
  65  * only to hold the kernel stack pointer for the current thread.
  66  *
  67  * XXX multiprocessor??
  68  */
  69 #include <i386/tss.h>
  70 #include <i386/seg.h>
  71 #include <mach_kdb.h>
  72
  73 struct i386_tss ktss = {
  74         0,                              /* back link */
  75         0,                              /* esp0 */
  76         KERNEL_DS,                      /* ss0 */
  77         0,                              /* esp1 */
  78         0,                              /* ss1 */
  79         0,                              /* esp2 */
  80         0,                              /* ss2 */
  81         0,                              /* cr3 */
  82         0,                              /* eip */
  83         0,                              /* eflags */
  84         0,                              /* eax */
  85         0,                              /* ecx */
  86         0,                              /* edx */
  87         0,                              /* ebx */
  88         0,                              /* esp */
  89         0,                              /* ebp */
  90         0,                              /* esi */
  91         0,                              /* edi */
  92         0,                              /* es */
  93         0,                              /* cs */
  94         0,                              /* ss */
  95         0,                              /* ds */
  96         0,                              /* fs */
  97         0,                              /* gs */
  98         KERNEL_LDT,                     /* ldt */
  99         0,                              /* trace_trap */
 100         0x0FFF                          /* IO bitmap offset -
 101                                            beyond end of TSS segment,
 102                                            so no bitmap */
 103 };
 104
 105 #if     MACH_KDB
 106
 107 struct i386_tss dbtss = {
 108         0,                              /* back link */
 109         0,                              /* esp0 */
 110         KERNEL_DS,                      /* ss0 */
 111         0,                              /* esp1 */
 112         0,                              /* ss1 */
 113         0,                              /* esp2 */
 114         0,                              /* ss2 */
 115         0,                              /* cr3 */
 116         0,                              /* eip */
 117         0,                              /* eflags */
 118         0,                              /* eax */
 119         0,                              /* ecx */
 120         0,                              /* edx */
 121         0,                              /* ebx */
 122         0,                              /* esp */
 123         0,                              /* ebp */
 124         0,                              /* esi */
 125         0,                              /* edi */
 126         KERNEL_DS,                      /* es */
 127         KERNEL_CS,                      /* cs */
 128         KERNEL_DS,                      /* ss */
 129         KERNEL_DS,                      /* ds */
 130         KERNEL_DS,                      /* fs */
 131         KERNEL_DS,                      /* gs */
 132         KERNEL_LDT,                     /* ldt */
 133         0,                              /* trace_trap */
 134         0x0FFF                          /* IO bitmap offset -
 135                                            beyond end of TSS segment,
 136                                            so no bitmap */
 137 };
 138
 139 #endif  /* MACH_KDB */