The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/gdt.c

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    1 /* 
    2  * Mach Operating System
    3  * Copyright (c) 1991,1990 Carnegie Mellon University
    4  * Copyright (c) 1991 IBM Corporation 
    5  * All Rights Reserved.
    6  * 
    7  * Permission to use, copy, modify and distribute this software and its
    8  * documentation is hereby granted, provided that both the copyright
    9  * notice and this permission notice appear in all copies of the
   10  * software, derivative works or modified versions, and any portions
   11  * thereof, and that both notices appear in supporting documentation,
   12  * and that the name IBM not be used in advertising or publicity 
   13  * pertaining to distribution of the software without specific, written
   14  * prior permission.
   15  * 
   16  * CARNEGIE MELLON AND IBM ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   17  * CONDITION.  CARNEGIE MELLON AND IBM DISCLAIM ANY LIABILITY OF ANY KIND FOR
   18  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   19  * 
   20  * Carnegie Mellon requests users of this software to return to
   21  * 
   22  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   23  *  School of Computer Science
   24  *  Carnegie Mellon University
   25  *  Pittsburgh PA 15213-3890
   26  * 
   27  * any improvements or extensions that they make and grant Carnegie Mellon
   28  * the rights to redistribute these changes.
   29  */
   30 
   31 
   32 /*
   33  * HISTORY
   34  * $Log:        gdt.c,v $
   35  * Revision 2.8  93/02/04  07:56:04  danner
   36  *      Merge in PS2 support.
   37  *      [92/02/22            dbg@ibm]
   38  * 
   39  * Revision 2.7  92/01/03  20:05:58  dbg
   40  *      Add entries for user LDT, floating-point register
   41  *      access from emulator, and floating-point emulator code.
   42  *      [91/10/18            dbg]
   43  * 
   44  * Revision 2.6  91/05/14  16:08:04  mrt
   45  *      Correcting copyright
   46  * 
   47  * Revision 2.5  91/05/08  12:31:41  dbg
   48  *      Collapsed GDT again.
   49  *      [91/04/26  14:34:34  dbg]
   50  * 
   51  * Revision 2.4  91/02/05  17:11:52  mrt
   52  *      Changed to new Mach copyright
   53  *      [91/02/01  17:34:15  mrt]
   54  * 
   55  * Revision 2.3  90/08/27  21:56:36  dbg
   56  *      Collapsed GDT.  Use new segmentation definitions.
   57  *      [90/07/25            dbg]
   58  * 
   59  * Revision 2.2  90/05/03  15:27:29  dbg
   60  *      Created.
   61  *      [90/02/15            dbg]
   62  * 
   63  */
   64 
   65 /*
   66  * Global descriptor table.
   67  */
   68 #include <platforms.h>
   69 
   70 #include <i386/seg.h>
   71 #include <i386/tss.h>
   72 #include <mach/i386/vm_types.h>
   73 #include <mach/i386/vm_param.h>
   74 
   75 extern struct fake_descriptor   ldt[];
   76 extern struct i386_tss          ktss;
   77 
   78 #if     PS2
   79 extern unsigned long abios_int_return;
   80 extern unsigned long abios_th_return;
   81 extern char intstack[];
   82 #endif  /* PS2 */
   83 
   84 struct fake_descriptor gdt[GDTSZ] = {
   85 /* 0x000 */     { 0, 0, 0, 0 },         /* always NULL */
   86 /* 0x008 */     { VM_MIN_ADDRESS,
   87                   (VM_MAX_KERNEL_ADDRESS-1-VM_MIN_ADDRESS)>>12,
   88                   SZ_32|SZ_G,
   89                   ACC_P|ACC_PL_K|ACC_CODE_R
   90                 },                      /* kernel code */
   91 /* 0x010 */     { VM_MIN_ADDRESS,
   92                   (VM_MAX_KERNEL_ADDRESS-1-VM_MIN_ADDRESS)>>12,
   93                   SZ_32|SZ_G,
   94                   ACC_P|ACC_PL_K|ACC_DATA_W
   95                 },                      /* kernel data */
   96 /* 0x018 */     { (unsigned int)ldt,
   97                   LDTSZ*sizeof(struct fake_descriptor)-1,
   98                   0,
   99                   ACC_P|ACC_PL_K|ACC_LDT
  100                 },                      /* local descriptor table */
  101 /* 0x020 */     { (unsigned int)&ktss,
  102                   sizeof(struct i386_tss),
  103                   0,
  104                   ACC_P|ACC_PL_K|ACC_TSS
  105                 },                      /* TSS for this processor */
  106 /* 0x028 */     { 0, 0, 0, 0 },         /* per-thread LDT */
  107 /* 0x030 */     { 0, 0, 0, 0 },         /* per-thread TSS for IO bitmap */
  108 /* 0x038 */     { 0, 0, 0, 0 },         /* FP emulator code segment */
  109 /* 0x040 */     { 0, 0, 0, 0 },         /* FP emulator data (FP registers) */
  110 
  111 #ifdef  PS2
  112 /* 0x048 */     { (unsigned int)&abios_int_return,
  113                   15,
  114                   SZ_32|SZ_G,
  115                   ACC_P|ACC_PL_K|ACC_CODE_R
  116                 },                      /* return from ABIOS - thread stack */ 
  117 /* 0x050 */     { (unsigned int)&abios_th_return,
  118                   15, 
  119                   SZ_32|SZ_G,
  120                   ACC_P|ACC_PL_K|ACC_CODE_R
  121                 },                      /* return from ABIOS - int stack */
  122 /* 0x058 */     { (unsigned int) &intstack,
  123                   INTSTACK_SIZE-1,
  124                   0,                    /* 16 bit, byte granularity */
  125                   ACC_P|ACC_PL_K|ACC_DATA_W
  126                 },                      /* ABIOS interrupt stack */
  127 /* 0x060 */     { 0,                    /* will be filled in later */
  128                   KERNEL_STACK_SIZE-1,
  129                   0,                    /* 16 bit, byte granularity */
  130                   ACC_P|ACC_PL_K|ACC_DATA_W
  131                 },                      /* ABIOS kernel stack */
  132 /* 0x068 */     { 0, 0, 0, 0 },         /* first avail for allocate_gdt */
  133 #endif  /* PS2 */
  134 };
  135 
  136 

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