gen/libsaio/table.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Mach Operating System
  26  * Copyright (c) 1990 Carnegie-Mellon University
  27  * Copyright (c) 1989 Carnegie-Mellon University
  28  * All rights reserved.  The CMU software License Agreement specifies
  29  * the terms and conditions for use and redistribution.
  30  */
  31
  32 /*
  33  *                      INTEL CORPORATION PROPRIETARY INFORMATION
  34  *
  35  *      This software is supplied under the terms of a license  agreement or
  36  *      nondisclosure agreement with Intel Corporation and may not be copied
  37  *      nor disclosed except in accordance with the terms of that agreement.
  38  *
  39  *      Copyright 1988, 1989 Intel Corporation
  40  */
  41
  42 /*
  43  * Copyright 1993 NeXT, Inc.
  44  * All rights reserved.
  45  */
  46
  47 #include "memory.h"
  48
  49 #define NGDTENT         6
  50 #define GDTLIMIT        48      /* NGDTENT * 8 */
  51
  52 /*  Segment Descriptor
  53  *
  54  * 31          24         19   16                 7           0
  55  * ------------------------------------------------------------
  56  * |             | |B| |A|       | |   |1|0|E|W|A|            |
  57  * | BASE 31..24 |G|/|0|V| LIMIT |P|DPL|  TYPE   | BASE 23:16 |
  58  * |             | |D| |L| 19..16| |   |1|1|C|R|A|            |
  59  * ------------------------------------------------------------
  60  * |                             |                            |
  61  * |        BASE 15..0           |       LIMIT 15..0          |
  62  * |                             |                            |
  63  * ------------------------------------------------------------
  64  */
  65
  66 struct seg_desc {
  67         unsigned short  limit_15_0;
  68         unsigned short  base_15_0;
  69         unsigned char   base_23_16;
  70         unsigned char   bit_15_8;
  71         unsigned char   bit_23_16;
  72         unsigned char   base_31_24;
  73         };
  74
  75
  76 struct seg_desc Gdt[NGDTENT] = {
  77     {0x0,    0x0,     0x0, 0x0,  0x0,  0x0},    /* 0x0 : null */
  78     // byte granularity, 1Mb limit, MEMBASE offset
  79     {0xFFFF, MEMBASE, 0x0, 0x9E, 0x4F, 0x0},    /* 0x8 : boot code */
  80     // dword granularity, 2Gb limit, MEMBASE offset
  81     {0xFFFF, MEMBASE, 0x0, 0x92, 0xCF, 0x0},    /* 0x10 : boot data */
  82     {0xFFFF, MEMBASE, 0x0, 0x9E, 0xF,  0x0},    /* 0x18 : boot code, 16 bits */
  83     {0xFFFF, 0x0,     0x0, 0x92, 0xCF, 0x0},    /* 0x20 : init data */
  84     {0xFFFF, 0x0,     0x0, 0x9E, 0xCF, 0x0}     /* 0x28 : init code */
  85 };
  86