osfmk/i386/gdt.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 /* CMU_ENDHIST */
  34 /*
  35  * Mach Operating System
  36  * Copyright (c) 1991,1990 Carnegie Mellon University
  37  * All Rights Reserved.
  38  *
  39  * Permission to use, copy, modify and distribute this software and its
  40  * documentation is hereby granted, provided that both the copyright
  41  * notice and this permission notice appear in all copies of the
  42  * software, derivative works or modified versions, and any portions
  43  * thereof, and that both notices appear in supporting documentation.
  44  *
  45  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  46  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  47  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  48  *
  49  * Carnegie Mellon requests users of this software to return to
  50  *
  51  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  52  *  School of Computer Science
  53  *  Carnegie Mellon University
  54  *  Pittsburgh PA 15213-3890
  55  *
  56  * any improvements or extensions that they make and grant Carnegie Mellon
  57  * the rights to redistribute these changes.
  58  */
  59 /*
  60  */
  61
  62 /*
  63  * Global descriptor table.
  64  */
  65 #include <mach/machine.h>
  66 #include <mach/i386/vm_param.h>
  67 #include <kern/thread.h>
  68 #include <i386/cpu_data.h>
  69 #include <i386/mp_desc.h>
  70
  71 struct fake_descriptor master_gdt[GDTSZ] __attribute__ ((aligned (4096))) = {
  72         [SEL_TO_INDEX(KERNEL_CS)] {     /* kernel 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)] {     /* 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(KERNEL_LDT)] {    /* local descriptor table */
  85                 (uint32_t) &master_ldt,
  86                 LDTSZ_MIN*sizeof(struct fake_descriptor)-1,
  87                 0,
  88                 ACC_P|ACC_PL_K|ACC_LDT
  89         },                              /* The slot KERNEL_LDT_2 is reserved. */
  90         [SEL_TO_INDEX(KERNEL_TSS)] {    /* TSS for this processor */
  91                 (uint32_t) &master_ktss,
  92                 sizeof(struct i386_tss)-1,
  93                 0,
  94                 ACC_P|ACC_PL_K|ACC_TSS
  95         },                              /* The slot KERNEL_TSS_2 is reserved. */
  96         [SEL_TO_INDEX(CPU_DATA_GS)] {   /* per-CPU current thread address */
  97                 (uint32_t) &cpu_data_master,
  98                 sizeof(cpu_data_t)-1,
  99                 SZ_32,
 100                 ACC_P|ACC_PL_K|ACC_DATA_W
 101         },
 102         [SEL_TO_INDEX(USER_LDT)] {      /* user local descriptor table */
 103                 (uint32_t) &master_ldt,
 104                 LDTSZ_MIN*sizeof(struct fake_descriptor)-1,
 105                 0,
 106                 ACC_P|ACC_PL_K|ACC_LDT
 107         },
 108         [SEL_TO_INDEX(KERNEL64_CS)] {   /* kernel 64-bit code */
 109                 0,
 110                 0xfffff,
 111                 SZ_64|SZ_G,
 112                 ACC_P|ACC_PL_K|ACC_CODE_R
 113         },
 114         [SEL_TO_INDEX(KERNEL64_SS)] {   /* kernel 64-bit syscall stack */
 115                 0,
 116                 0xfffff,
 117                 SZ_32|SZ_G,
 118                 ACC_P|ACC_PL_K|ACC_DATA_W
 119         },
 120 #if     MACH_KDB
 121         [SEL_TO_INDEX(DEBUG_TSS)] {     /* TSS for this processor */
 122                 (uint32_t)&master_dbtss,
 123                 sizeof(struct i386_tss)-1,
 124                 0,
 125                 ACC_P|ACC_PL_K|ACC_TSS
 126         },
 127 #endif  /* MACH_KDB */
 128 };