osfmk/i386/ktss.c

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