osfmk/i386/ldt.c

   1 /*
   2  * Copyright (c) 2000 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  * "Local" descriptor table.  At the moment, all tasks use the
  61  * same LDT.
  62  */
  63 #include <i386/seg.h>
  64 #include <i386/pmap.h>
  65 #include <mach/i386/vm_types.h>
  66 #include <mach/i386/vm_param.h>
  67
  68
  69 struct fake_descriptor  master_ldt[LDTSZ] __attribute__ ((aligned (4096))) = {
  70         [SEL_TO_INDEX(SYSENTER_CS)] {   /* kernel code (sysenter) */
  71                 0,
  72           0xfffff,
  73           SZ_32|SZ_G,
  74           ACC_P|ACC_PL_K|ACC_CODE_R
  75         },
  76         [SEL_TO_INDEX(SYSENTER_DS)] {   /* kernel data (sysenter) */
  77                 0,
  78           0xfffff,
  79           SZ_32|SZ_G,
  80           ACC_P|ACC_PL_K|ACC_DATA_W
  81         },
  82         [SEL_TO_INDEX(USER_CS)] {       /* user code segment */
  83                 0,
  84           0xfffff,
  85           SZ_32|SZ_G,
  86           ACC_P|ACC_PL_U|ACC_CODE_R
  87         },
  88         [SEL_TO_INDEX(USER_DS)] {       /* user data segment */
  89                 0,
  90           0xfffff,
  91           SZ_32|SZ_G,
  92           ACC_P|ACC_PL_U|ACC_DATA_W
  93         },
  94         [SEL_TO_INDEX(USER64_CS)] {     /* user 64-bit code segment */
  95                 0,
  96                 0xfffff,
  97                 SZ_64|SZ_G,
  98                 ACC_P|ACC_PL_U|ACC_CODE_R
  99         },
 100         [SEL_TO_INDEX(USER_CTHREAD)] {  /* user cthread segment */
 101                 0,
 102           0xfffff,
 103           SZ_32|SZ_G,
 104           ACC_P|ACC_PL_U|ACC_DATA_W
 105         },
 106 };