osfmk/i386/ktss.c

   1 /*
   2  * Copyright (c) 2000-2006 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 #include <i386/tss.h>
  66 #include <i386/seg.h>
  67 #include <mach_kdb.h>
  68
  69 struct i386_tss master_ktss
  70         __attribute__ ((section ("__DESC, master_ktss")))
  71         __attribute__ ((aligned (4096))) = {
  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 /*
 104  * The transient stack for sysenter.
 105  * At its top is a 32-bit link to the PCB in legacy mode, 64-bit otherwise.
 106  * NB: it also must be large enough to contain a interrupt stack frame
 107  * due to a single-step trace trap at system call entry.
 108  */
 109 struct sysenter_stack master_sstk
 110         __attribute__ ((section ("__DESC, master_sstk")))
 111         __attribute__ ((aligned (16)))  = { {0}, 0 };
 112
 113 #ifdef X86_64
 114 struct x86_64_tss master_ktss64 __attribute__ ((aligned (4096))) = {
 115         .io_bit_map_offset = 0x0FFF,
 116 };
 117 #endif  /* X86_64 */
 118
 119 /*
 120  * Task structure for double-fault handler:
 121  */
 122 struct i386_tss master_dftss
 123         __attribute__ ((section ("__DESC, master_dftss")))
 124         __attribute__ ((aligned (4096))) = {
 125         0,                              /* back link */
 126         (int) &df_task_stack_end - 4,   /* esp0 */
 127         KERNEL_DS,                      /* ss0 */
 128         0,                              /* esp1 */
 129         0,                              /* ss1 */
 130         0,                              /* esp2 */
 131         0,                              /* ss2 */
 132         0,                              /* cr3 */
 133         (int) &df_task_start,           /* eip */
 134         0,                              /* eflags */
 135         0,                              /* eax */
 136         0,                              /* ecx */
 137         0,                              /* edx */
 138         0,                              /* ebx */
 139         (int) &df_task_stack_end - 4,   /* esp */
 140         0,                              /* ebp */
 141         0,                              /* esi */
 142         0,                              /* edi */
 143         KERNEL_DS,                      /* es */
 144         KERNEL_CS,                      /* cs */
 145         KERNEL_DS,                      /* ss */
 146         KERNEL_DS,                      /* ds */
 147         KERNEL_DS,                      /* fs */
 148         CPU_DATA_GS,                    /* gs */
 149         KERNEL_LDT,                     /* ldt */
 150         0,                              /* trace_trap */
 151         0x0FFF                          /* IO bitmap offset -
 152                                            beyond end of TSS segment,
 153                                            so no bitmap */
 154 };
 155
 156
 157 /*
 158  * Task structure for machine_check handler:
 159  */
 160 struct i386_tss master_mctss
 161         __attribute__ ((section ("__DESC, master_mctss")))
 162         __attribute__ ((aligned (4096))) = {
 163         0,                              /* back link */
 164         (int) &mc_task_stack_end - 4,   /* esp0 */
 165         KERNEL_DS,                      /* ss0 */
 166         0,                              /* esp1 */
 167         0,                              /* ss1 */
 168         0,                              /* esp2 */
 169         0,                              /* ss2 */
 170         0,                              /* cr3 */
 171         (int) &mc_task_start,           /* eip */
 172         0,                              /* eflags */
 173         0,                              /* eax */
 174         0,                              /* ecx */
 175         0,                              /* edx */
 176         0,                              /* ebx */
 177         (int) &mc_task_stack_end - 4,   /* esp */
 178         0,                              /* ebp */
 179         0,                              /* esi */
 180         0,                              /* edi */
 181         KERNEL_DS,                      /* es */
 182         KERNEL_CS,                      /* cs */
 183         KERNEL_DS,                      /* ss */
 184         KERNEL_DS,                      /* ds */
 185         KERNEL_DS,                      /* fs */
 186         CPU_DATA_GS,                    /* gs */
 187         KERNEL_LDT,                     /* ldt */
 188         0,                              /* trace_trap */
 189         0x0FFF                          /* IO bitmap offset -
 190                                            beyond end of TSS segment,
 191                                            so no bitmap */
 192 };
 193
 194 #if     MACH_KDB
 195
 196 struct i386_tss master_dbtss
 197         __attribute__ ((section ("__DESC, master_dbtss")))
 198         __attribute__ ((aligned (4096))) = {
 199         0,                              /* back link */
 200         0,                              /* esp0 */
 201         KERNEL_DS,                      /* ss0 */
 202         0,                              /* esp1 */
 203         0,                              /* ss1 */
 204         0,                              /* esp2 */
 205         0,                              /* ss2 */
 206         0,                              /* cr3 */
 207         0,                              /* eip */
 208         0,                              /* eflags */
 209         0,                              /* eax */
 210         0,                              /* ecx */
 211         0,                              /* edx */
 212         0,                              /* ebx */
 213         0,                              /* esp */
 214         0,                              /* ebp */
 215         0,                              /* esi */
 216         0,                              /* edi */
 217         KERNEL_DS,                      /* es */
 218         KERNEL_CS,                      /* cs */
 219         KERNEL_DS,                      /* ss */
 220         KERNEL_DS,                      /* ds */
 221         KERNEL_DS,                      /* fs */
 222         KERNEL_DS,                      /* gs */
 223         KERNEL_LDT,                     /* ldt */
 224         0,                              /* trace_trap */
 225         0x0FFF                          /* IO bitmap offset -
 226                                            beyond end of TSS segment,
 227                                            so no bitmap */
 228 };
 229
 230 #endif  /* MACH_KDB */