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  */
  68 #include <i386/tss.h>
  69 #include <i386/seg.h>
  70 #include <mach_kdb.h>
  71
  72 struct i386_tss master_ktss
  73         __attribute__ ((section ("__DESC, master_ktss")))
  74         __attribute__ ((aligned (4096))) = {
  75         0,                              /* back link */
  76         0,                              /* esp0 */
  77         KERNEL_DS,                      /* ss0 */
  78         0,                              /* esp1 */
  79         0,                              /* ss1 */
  80         0,                              /* esp2 */
  81         0,                              /* ss2 */
  82         0,                              /* cr3 */
  83         0,                              /* eip */
  84         0,                              /* eflags */
  85         0,                              /* eax */
  86         0,                              /* ecx */
  87         0,                              /* edx */
  88         0,                              /* ebx */
  89         0,                              /* esp */
  90         0,                              /* ebp */
  91         0,                              /* esi */
  92         0,                              /* edi */
  93         0,                              /* es */
  94         0,                              /* cs */
  95         0,                              /* ss */
  96         0,                              /* ds */
  97         0,                              /* fs */
  98         0,                              /* gs */
  99         KERNEL_LDT,                     /* ldt */
 100         0,                              /* trace_trap */
 101         0x0FFF                          /* IO bitmap offset -
 102                                            beyond end of TSS segment,
 103                                            so no bitmap */
 104 };
 105
 106 /*
 107  * The transient stack for sysenter.
 108  * At its top is a 32-bit link to the PCB in legacy mode, 64-bit otherwise.
 109  * NB: it also must be large enough to contain a interrupt stack frame
 110  * due to a single-step trace trap at system call entry.
 111  */
 112 struct sysenter_stack master_sstk
 113         __attribute__ ((section ("__DESC, master_sstk")))
 114         __attribute__ ((aligned (16)))  = { {0}, 0 };
 115
 116 #ifdef X86_64
 117 struct x86_64_tss master_ktss64 __attribute__ ((aligned (4096))) = {
 118         .io_bit_map_offset = 0x0FFF,
 119 };
 120 #endif  /* X86_64 */
 121
 122
 123
 124 /*
 125  * Task structure for double-fault handler:
 126  */
 127 struct i386_tss master_dftss
 128         __attribute__ ((section ("__DESC, master_dftss")))
 129         __attribute__ ((aligned (4096))) = {
 130         0,                              /* back link */
 131         (int) &df_task_stack_end - 4,   /* esp0 */
 132         KERNEL_DS,                      /* ss0 */
 133         0,                              /* esp1 */
 134         0,                              /* ss1 */
 135         0,                              /* esp2 */
 136         0,                              /* ss2 */
 137         0,                              /* cr3 */
 138         (int) &df_task_start,           /* eip */
 139         0,                              /* eflags */
 140         0,                              /* eax */
 141         0,                              /* ecx */
 142         0,                              /* edx */
 143         0,                              /* ebx */
 144         (int) &df_task_stack_end - 4,   /* esp */
 145         0,                              /* ebp */
 146         0,                              /* esi */
 147         0,                              /* edi */
 148         KERNEL_DS,                      /* es */
 149         KERNEL_CS,                      /* cs */
 150         KERNEL_DS,                      /* ss */
 151         KERNEL_DS,                      /* ds */
 152         KERNEL_DS,                      /* fs */
 153         CPU_DATA_GS,                    /* gs */
 154         KERNEL_LDT,                     /* ldt */
 155         0,                              /* trace_trap */
 156         0x0FFF                          /* IO bitmap offset -
 157                                            beyond end of TSS segment,
 158                                            so no bitmap */
 159 };
 160
 161
 162 /*
 163  * Task structure for machine_check handler:
 164  */
 165 struct i386_tss master_mctss
 166         __attribute__ ((section ("__DESC, master_mctss")))
 167         __attribute__ ((aligned (4096))) = {
 168         0,                              /* back link */
 169         (int) &mc_task_stack_end - 4,   /* esp0 */
 170         KERNEL_DS,                      /* ss0 */
 171         0,                              /* esp1 */
 172         0,                              /* ss1 */
 173         0,                              /* esp2 */
 174         0,                              /* ss2 */
 175         0,                              /* cr3 */
 176         (int) &mc_task_start,           /* eip */
 177         0,                              /* eflags */
 178         0,                              /* eax */
 179         0,                              /* ecx */
 180         0,                              /* edx */
 181         0,                              /* ebx */
 182         (int) &mc_task_stack_end - 4,   /* esp */
 183         0,                              /* ebp */
 184         0,                              /* esi */
 185         0,                              /* edi */
 186         KERNEL_DS,                      /* es */
 187         KERNEL_CS,                      /* cs */
 188         KERNEL_DS,                      /* ss */
 189         KERNEL_DS,                      /* ds */
 190         KERNEL_DS,                      /* fs */
 191         CPU_DATA_GS,                    /* gs */
 192         KERNEL_LDT,                     /* ldt */
 193         0,                              /* trace_trap */
 194         0x0FFF                          /* IO bitmap offset -
 195                                            beyond end of TSS segment,
 196                                            so no bitmap */
 197 };
 198
 199 #if     MACH_KDB
 200
 201 struct i386_tss master_dbtss
 202         __attribute__ ((section ("__DESC, master_dbtss")))
 203         __attribute__ ((aligned (4096))) = {
 204         0,                              /* back link */
 205         0,                              /* esp0 */
 206         KERNEL_DS,                      /* ss0 */
 207         0,                              /* esp1 */
 208         0,                              /* ss1 */
 209         0,                              /* esp2 */
 210         0,                              /* ss2 */
 211         0,                              /* cr3 */
 212         0,                              /* eip */
 213         0,                              /* eflags */
 214         0,                              /* eax */
 215         0,                              /* ecx */
 216         0,                              /* edx */
 217         0,                              /* ebx */
 218         0,                              /* esp */
 219         0,                              /* ebp */
 220         0,                              /* esi */
 221         0,                              /* edi */
 222         KERNEL_DS,                      /* es */
 223         KERNEL_CS,                      /* cs */
 224         KERNEL_DS,                      /* ss */
 225         KERNEL_DS,                      /* ds */
 226         KERNEL_DS,                      /* fs */
 227         KERNEL_DS,                      /* gs */
 228         KERNEL_LDT,                     /* ldt */
 229         0,                              /* trace_trap */
 230         0x0FFF                          /* IO bitmap offset -
 231                                            beyond end of TSS segment,
 232                                            so no bitmap */
 233 };
 234
 235 #endif  /* MACH_KDB */