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  */
  60 #include <i386/tss.h>
  61 #include <i386/seg.h>
  62 #include <mach_kdb.h>
  63
  64 struct i386_tss master_ktss
  65         __attribute__ ((section ("__DESC, master_ktss")))
  66         __attribute__ ((aligned (4096))) = {
  67         0,                              /* back link */
  68         0,                              /* esp0 */
  69         KERNEL_DS,                      /* ss0 */
  70         0,                              /* esp1 */
  71         0,                              /* ss1 */
  72         0,                              /* esp2 */
  73         0,                              /* ss2 */
  74         0,                              /* cr3 */
  75         0,                              /* eip */
  76         0,                              /* eflags */
  77         0,                              /* eax */
  78         0,                              /* ecx */
  79         0,                              /* edx */
  80         0,                              /* ebx */
  81         0,                              /* esp */
  82         0,                              /* ebp */
  83         0,                              /* esi */
  84         0,                              /* edi */
  85         0,                              /* es */
  86         0,                              /* cs */
  87         0,                              /* ss */
  88         0,                              /* ds */
  89         0,                              /* fs */
  90         0,                              /* gs */
  91         KERNEL_LDT,                     /* ldt */
  92         0,                              /* trace_trap */
  93         0x0FFF                          /* IO bitmap offset -
  94                                            beyond end of TSS segment,
  95                                            so no bitmap */
  96 };
  97
  98 /*
  99  * The transient stack for sysenter.
 100  * At its top is a 32-bit link to the PCB in legacy mode, 64-bit otherwise.
 101  * NB: it also must be large enough to contain a interrupt stack frame
 102  * due to a single-step trace trap at system call entry.
 103  */
 104 struct sysenter_stack master_sstk
 105         __attribute__ ((section ("__DESC, master_sstk")))
 106         __attribute__ ((aligned (16)))  = { {0}, 0 };
 107
 108 #ifdef X86_64
 109 struct x86_64_tss master_ktss64 __attribute__ ((aligned (4096))) = {
 110         .io_bit_map_offset = 0x0FFF,
 111 };
 112 #endif  /* X86_64 */
 113
 114
 115
 116 /*
 117  * Task structure for double-fault handler:
 118  */
 119 struct i386_tss master_dftss
 120         __attribute__ ((section ("__DESC, master_dftss")))
 121         __attribute__ ((aligned (4096))) = {
 122         0,                              /* back link */
 123         (int) &df_task_stack_end - 4,   /* esp0 */
 124         KERNEL_DS,                      /* ss0 */
 125         0,                              /* esp1 */
 126         0,                              /* ss1 */
 127         0,                              /* esp2 */
 128         0,                              /* ss2 */
 129         0,                              /* cr3 */
 130         (int) &df_task_start,           /* eip */
 131         0,                              /* eflags */
 132         0,                              /* eax */
 133         0,                              /* ecx */
 134         0,                              /* edx */
 135         0,                              /* ebx */
 136         (int) &df_task_stack_end - 4,   /* esp */
 137         0,                              /* ebp */
 138         0,                              /* esi */
 139         0,                              /* edi */
 140         KERNEL_DS,                      /* es */
 141         KERNEL_CS,                      /* cs */
 142         KERNEL_DS,                      /* ss */
 143         KERNEL_DS,                      /* ds */
 144         KERNEL_DS,                      /* fs */
 145         CPU_DATA_GS,                    /* gs */
 146         KERNEL_LDT,                     /* ldt */
 147         0,                              /* trace_trap */
 148         0x0FFF                          /* IO bitmap offset -
 149                                            beyond end of TSS segment,
 150                                            so no bitmap */
 151 };
 152
 153
 154 /*
 155  * Task structure for machine_check handler:
 156  */
 157 struct i386_tss master_mctss
 158         __attribute__ ((section ("__DESC, master_mctss")))
 159         __attribute__ ((aligned (4096))) = {
 160         0,                              /* back link */
 161         (int) &mc_task_stack_end - 4,   /* esp0 */
 162         KERNEL_DS,                      /* ss0 */
 163         0,                              /* esp1 */
 164         0,                              /* ss1 */
 165         0,                              /* esp2 */
 166         0,                              /* ss2 */
 167         0,                              /* cr3 */
 168         (int) &mc_task_start,           /* eip */
 169         0,                              /* eflags */
 170         0,                              /* eax */
 171         0,                              /* ecx */
 172         0,                              /* edx */
 173         0,                              /* ebx */
 174         (int) &mc_task_stack_end - 4,   /* esp */
 175         0,                              /* ebp */
 176         0,                              /* esi */
 177         0,                              /* edi */
 178         KERNEL_DS,                      /* es */
 179         KERNEL_CS,                      /* cs */
 180         KERNEL_DS,                      /* ss */
 181         KERNEL_DS,                      /* ds */
 182         KERNEL_DS,                      /* fs */
 183         CPU_DATA_GS,                    /* gs */
 184         KERNEL_LDT,                     /* ldt */
 185         0,                              /* trace_trap */
 186         0x0FFF                          /* IO bitmap offset -
 187                                            beyond end of TSS segment,
 188                                            so no bitmap */
 189 };
 190
 191 #if     MACH_KDB
 192
 193 struct i386_tss master_dbtss
 194         __attribute__ ((section ("__DESC, master_dbtss")))
 195         __attribute__ ((aligned (4096))) = {
 196         0,                              /* back link */
 197         0,                              /* esp0 */
 198         KERNEL_DS,                      /* ss0 */
 199         0,                              /* esp1 */
 200         0,                              /* ss1 */
 201         0,                              /* esp2 */
 202         0,                              /* ss2 */
 203         0,                              /* cr3 */
 204         0,                              /* eip */
 205         0,                              /* eflags */
 206         0,                              /* eax */
 207         0,                              /* ecx */
 208         0,                              /* edx */
 209         0,                              /* ebx */
 210         0,                              /* esp */
 211         0,                              /* ebp */
 212         0,                              /* esi */
 213         0,                              /* edi */
 214         KERNEL_DS,                      /* es */
 215         KERNEL_CS,                      /* cs */
 216         KERNEL_DS,                      /* ss */
 217         KERNEL_DS,                      /* ds */
 218         KERNEL_DS,                      /* fs */
 219         KERNEL_DS,                      /* gs */
 220         KERNEL_LDT,                     /* ldt */
 221         0,                              /* trace_trap */
 222         0x0FFF                          /* IO bitmap offset -
 223                                            beyond end of TSS segment,
 224                                            so no bitmap */
 225 };
 226
 227 #endif  /* MACH_KDB */