osfmk/i386/gdt.c

   1 /*
   2  * Copyright (c) 2000-2009 Apple 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 /* CMU_ENDHIST */
  32 /*
  33  * Mach Operating System
  34  * Copyright (c) 1991,1990 Carnegie Mellon University
  35  * All Rights Reserved.
  36  *
  37  * Permission to use, copy, modify and distribute this software and its
  38  * documentation is hereby granted, provided that both the copyright
  39  * notice and this permission notice appear in all copies of the
  40  * software, derivative works or modified versions, and any portions
  41  * thereof, and that both notices appear in supporting documentation.
  42  *
  43  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  44  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  45  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  46  *
  47  * Carnegie Mellon requests users of this software to return to
  48  *
  49  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  50  *  School of Computer Science
  51  *  Carnegie Mellon University
  52  *  Pittsburgh PA 15213-3890
  53  *
  54  * any improvements or extensions that they make and grant Carnegie Mellon
  55  * the rights to redistribute these changes.
  56  */
  57 /*
  58  */
  59
  60 /*
  61  * Global descriptor table.
  62  */
  63 #include <i386/seg.h>
  64
  65 struct real_descriptor master_gdt[GDTSZ]
  66 #if __x86_64__
  67         __attribute__((section("__HIB,__desc")))
  68 #else
  69         __attribute__((section("__INITGDT,__DATA")))
  70 #endif
  71         __attribute__((aligned(CPU_CACHE_SIZE))) = {
  72         [SEL_TO_INDEX(KERNEL32_CS)] = MAKE_REAL_DESCRIPTOR(     /* kernel 32-bit code */
  73                 0,
  74                 0xfffff,
  75                 SZ_32|SZ_G,
  76                 ACC_P|ACC_PL_K|ACC_CODE_R
  77         ),
  78         [SEL_TO_INDEX(KERNEL_DS)] = MAKE_REAL_DESCRIPTOR(       /* kernel data */
  79                 0,
  80                 0xfffff,
  81                 SZ_32|SZ_G,
  82                 ACC_P|ACC_PL_K|ACC_DATA_W
  83         ),
  84         [SEL_TO_INDEX(KERNEL64_CS)] = MAKE_REAL_DESCRIPTOR(     /* kernel 64-bit code */
  85                 0,
  86                 0xfffff,
  87                 SZ_64|SZ_G,
  88                 ACC_P|ACC_PL_K|ACC_CODE_R
  89         ),
  90         [SEL_TO_INDEX(KERNEL64_SS)] = MAKE_REAL_DESCRIPTOR(     /* kernel 64-bit syscall stack */
  91                 0,
  92                 0xfffff,
  93                 SZ_32|SZ_G,
  94                 ACC_P|ACC_PL_K|ACC_DATA_W
  95         ),
  96 #ifdef __x86_64__
  97         [SEL_TO_INDEX(USER_CS)] = MAKE_REAL_DESCRIPTOR( /* 32-bit user code segment */
  98                 0,
  99                 0xfffff,
 100                 SZ_32|SZ_G,
 101                 ACC_P|ACC_PL_U|ACC_CODE_R
 102         ),
 103         [SEL_TO_INDEX(USER_DS)] = MAKE_REAL_DESCRIPTOR( /* 32-bit user data segment */
 104                 0,
 105                 0xfffff,
 106                 SZ_32|SZ_G,
 107                 ACC_P|ACC_PL_U|ACC_DATA_W
 108         ),
 109         [SEL_TO_INDEX(USER64_CS)] = MAKE_REAL_DESCRIPTOR(       /* user 64-bit code segment */
 110                 0,
 111                 0xfffff,
 112                 SZ_64|SZ_G,
 113                 ACC_P|ACC_PL_U|ACC_CODE_R
 114         ),
 115 #endif
 116 };