osfmk/i386/ktss.c

   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 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 /*
  54  * Kernel task state segment.
  55  *
  56  * We don't use the i386 task switch mechanism.  We need a TSS
  57  * only to hold the kernel stack pointer for the current thread.
  58  *
  59  * XXX multiprocessor??
  60  */
  61 #include <i386/tss.h>
  62 #include <i386/seg.h>
  63 #include <mach_kdb.h>
  64
  65 struct i386_tss ktss = {
  66         0,                              /* back link */
  67         0,                              /* esp0 */
  68         KERNEL_DS,                      /* ss0 */
  69         0,                              /* esp1 */
  70         0,                              /* ss1 */
  71         0,                              /* esp2 */
  72         0,                              /* ss2 */
  73         0,                              /* cr3 */
  74         0,                              /* eip */
  75         0,                              /* eflags */
  76         0,                              /* eax */
  77         0,                              /* ecx */
  78         0,                              /* edx */
  79         0,                              /* ebx */
  80         0,                              /* esp */
  81         0,                              /* ebp */
  82         0,                              /* esi */
  83         0,                              /* edi */
  84         0,                              /* es */
  85         0,                              /* cs */
  86         0,                              /* ss */
  87         0,                              /* ds */
  88         0,                              /* fs */
  89         0,                              /* gs */
  90         KERNEL_LDT,                     /* ldt */
  91         0,                              /* trace_trap */
  92         0x0FFF                          /* IO bitmap offset -
  93                                            beyond end of TSS segment,
  94                                            so no bitmap */
  95 };
  96
  97 #if     MACH_KDB
  98
  99 struct i386_tss dbtss = {
 100         0,                              /* back link */
 101         0,                              /* esp0 */
 102         KERNEL_DS,                      /* ss0 */
 103         0,                              /* esp1 */
 104         0,                              /* ss1 */
 105         0,                              /* esp2 */
 106         0,                              /* ss2 */
 107         0,                              /* cr3 */
 108         0,                              /* eip */
 109         0,                              /* eflags */
 110         0,                              /* eax */
 111         0,                              /* ecx */
 112         0,                              /* edx */
 113         0,                              /* ebx */
 114         0,                              /* esp */
 115         0,                              /* ebp */
 116         0,                              /* esi */
 117         0,                              /* edi */
 118         KERNEL_DS,                      /* es */
 119         KERNEL_CS,                      /* cs */
 120         KERNEL_DS,                      /* ss */
 121         KERNEL_DS,                      /* ds */
 122         KERNEL_DS,                      /* fs */
 123         KERNEL_DS,                      /* gs */
 124         KERNEL_LDT,                     /* ldt */
 125         0,                              /* trace_trap */
 126         0x0FFF                          /* IO bitmap offset -
 127                                            beyond end of TSS segment,
 128                                            so no bitmap */
 129 };
 130
 131 #endif  /* MACH_KDB */