osfmk/i386/gdt.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 /* CMU_ENDHIST */
  26 /*
  27  * Mach Operating System
  28  * Copyright (c) 1991,1990 Carnegie Mellon University
  29  * All Rights Reserved.
  30  *
  31  * Permission to use, copy, modify and distribute this software and its
  32  * documentation is hereby granted, provided that both the copyright
  33  * notice and this permission notice appear in all copies of the
  34  * software, derivative works or modified versions, and any portions
  35  * thereof, and that both notices appear in supporting documentation.
  36  *
  37  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  38  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  39  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  40  *
  41  * Carnegie Mellon requests users of this software to return to
  42  *
  43  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  44  *  School of Computer Science
  45  *  Carnegie Mellon University
  46  *  Pittsburgh PA 15213-3890
  47  *
  48  * any improvements or extensions that they make and grant Carnegie Mellon
  49  * the rights to redistribute these changes.
  50  */
  51 /*
  52  */
  53
  54 /*
  55  * Global descriptor table.
  56  */
  57 #include <mach/machine.h>
  58 #include <mach/i386/vm_param.h>
  59 #include <kern/thread.h>
  60 #include <i386/cpu_data.h>
  61 #include <i386/mp_desc.h>
  62
  63 struct fake_descriptor master_gdt[GDTSZ] __attribute__ ((aligned (4096))) = {
  64         [SEL_TO_INDEX(KERNEL_CS)] {     /* kernel code */
  65                 0,
  66                 0xfffff,
  67                 SZ_32|SZ_G,
  68                 ACC_P|ACC_PL_K|ACC_CODE_R,
  69         },
  70         [SEL_TO_INDEX(KERNEL_DS)] {     /* kernel data */
  71                 0,
  72                 0xfffff,
  73                 SZ_32|SZ_G,
  74                 ACC_P|ACC_PL_K|ACC_DATA_W
  75         },
  76         [SEL_TO_INDEX(KERNEL_LDT)] {    /* local descriptor table */
  77                 (uint32_t) &master_ldt,
  78                 LDTSZ_MIN*sizeof(struct fake_descriptor)-1,
  79                 0,
  80                 ACC_P|ACC_PL_K|ACC_LDT
  81         },                              /* The slot KERNEL_LDT_2 is reserved. */
  82         [SEL_TO_INDEX(KERNEL_TSS)] {    /* TSS for this processor */
  83                 (uint32_t) &master_ktss,
  84                 sizeof(struct i386_tss)-1,
  85                 0,
  86                 ACC_P|ACC_PL_K|ACC_TSS
  87         },                              /* The slot KERNEL_TSS_2 is reserved. */
  88         [SEL_TO_INDEX(CPU_DATA_GS)] {   /* per-CPU current thread address */
  89                 (uint32_t) &cpu_data_master,
  90                 sizeof(cpu_data_t)-1,
  91                 SZ_32,
  92                 ACC_P|ACC_PL_K|ACC_DATA_W
  93         },
  94         [SEL_TO_INDEX(USER_LDT)] {      /* user local descriptor table */
  95                 (uint32_t) &master_ldt,
  96                 LDTSZ_MIN*sizeof(struct fake_descriptor)-1,
  97                 0,
  98                 ACC_P|ACC_PL_K|ACC_LDT
  99         },
 100         [SEL_TO_INDEX(KERNEL64_CS)] {   /* kernel 64-bit code */
 101                 0,
 102                 0xfffff,
 103                 SZ_64|SZ_G,
 104                 ACC_P|ACC_PL_K|ACC_CODE_R
 105         },
 106         [SEL_TO_INDEX(KERNEL64_SS)] {   /* kernel 64-bit syscall stack */
 107                 0,
 108                 0xfffff,
 109                 SZ_32|SZ_G,
 110                 ACC_P|ACC_PL_K|ACC_DATA_W
 111         },
 112 #if     MACH_KDB
 113         [SEL_TO_INDEX(DEBUG_TSS)] {     /* TSS for this processor */
 114                 (uint32_t)&master_dbtss,
 115                 sizeof(struct i386_tss)-1,
 116                 0,
 117                 ACC_P|ACC_PL_K|ACC_TSS
 118         },
 119 #endif  /* MACH_KDB */
 120 };