gen/libsaio/table.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1990 Carnegie-Mellon University
  28  * Copyright (c) 1989 Carnegie-Mellon University
  29  * All rights reserved.  The CMU software License Agreement specifies
  30  * the terms and conditions for use and redistribution.
  31  */
  32
  33 /*
  34  *                      INTEL CORPORATION PROPRIETARY INFORMATION
  35  *
  36  *      This software is supplied under the terms of a license  agreement or
  37  *      nondisclosure agreement with Intel Corporation and may not be copied
  38  *      nor disclosed except in accordance with the terms of that agreement.
  39  *
  40  *      Copyright 1988, 1989 Intel Corporation
  41  */
  42
  43 /*
  44  * Copyright 1993 NeXT, Inc.
  45  * All rights reserved.
  46  */
  47
  48 #include "memory.h"
  49
  50 #define NGDTENT         6
  51 #define GDTLIMIT        48      /* NGDTENT * 8 */
  52
  53 /*  Segment Descriptor
  54  *
  55  * 31          24         19   16                 7           0
  56  * ------------------------------------------------------------
  57  * |             | |B| |A|       | |   |1|0|E|W|A|            |
  58  * | BASE 31..24 |G|/|0|V| LIMIT |P|DPL|  TYPE   | BASE 23:16 |
  59  * |             | |D| |L| 19..16| |   |1|1|C|R|A|            |
  60  * ------------------------------------------------------------
  61  * |                             |                            |
  62  * |        BASE 15..0           |       LIMIT 15..0          |
  63  * |                             |                            |
  64  * ------------------------------------------------------------
  65  */
  66
  67 struct seg_desc {
  68         unsigned short  limit_15_0;
  69         unsigned short  base_15_0;
  70         unsigned char   base_23_16;
  71         unsigned char   bit_15_8;
  72         unsigned char   bit_23_16;
  73         unsigned char   base_31_24;
  74         };
  75
  76
  77 struct seg_desc Gdt[NGDTENT] = {
  78     {0x0,    0x0,     0x0, 0x0,  0x0,  0x0},    /* 0x0 : null */
  79     // byte granularity, 1Mb limit, MEMBASE offset
  80     {0xFFFF, MEMBASE, 0x0, 0x9E, 0x4F, 0x0},    /* 0x8 : boot code */
  81     // dword granularity, 2Gb limit, MEMBASE offset
  82     {0xFFFF, MEMBASE, 0x0, 0x92, 0xCF, 0x0},    /* 0x10 : boot data */
  83     {0xFFFF, MEMBASE, 0x0, 0x9E, 0xF,  0x0},    /* 0x18 : boot code, 16 bits */
  84     {0xFFFF, 0x0,     0x0, 0x92, 0xCF, 0x0},    /* 0x20 : init data */
  85     {0xFFFF, 0x0,     0x0, 0x9E, 0xCF, 0x0}     /* 0x28 : init code */
  86 };
  87