1 | /*␊ |
2 | * Copyright (c) 1999-2003 Apple Computer, Inc. All rights reserved.␊ |
3 | *␊ |
4 | * ␊ |
5 | * Portions Copyright (c) 1999-2003 Apple Computer, Inc. All Rights␊ |
6 | * Reserved. This file contains Original Code and/or Modifications of␊ |
7 | * Original Code as defined in and that are subject to the Apple Public␊ |
8 | * Source License Version 2.0 (the "License"). You may not use this file␊ |
9 | * except in compliance with the License. Please obtain a copy of the␊ |
10 | * License at http://www.apple.com/publicsource and read it before using␊ |
11 | * this file.␊ |
12 | * ␊ |
13 | * The Original Code and all software distributed under the License are␊ |
14 | * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER␊ |
15 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,␊ |
16 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,␊ |
17 | * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT. Please see the␊ |
18 | * License for the specific language governing rights and limitations␊ |
19 | * under the License.␊ |
20 | * ␊ |
21 | * ␊ |
22 | * Mach Operating System␊ |
23 | * Copyright (c) 1990 Carnegie-Mellon University␊ |
24 | * Copyright (c) 1989 Carnegie-Mellon University␊ |
25 | * All rights reserved. The CMU software License Agreement specifies␊ |
26 | * the terms and conditions for use and redistribution.␊ |
27 | *␊ |
28 | *␊ |
29 | * ␉␉␉INTEL CORPORATION PROPRIETARY INFORMATION␊ |
30 | *␊ |
31 | *␉This software is supplied under the terms of a license agreement or ␊ |
32 | *␉nondisclosure agreement with Intel Corporation and may not be copied ␊ |
33 | *␉nor disclosed except in accordance with the terms of that agreement.␊ |
34 | *␊ |
35 | *␉Copyright 1988, 1989 Intel Corporation␊ |
36 | *␊ |
37 | * Copyright 1993 NeXT, Inc.␊ |
38 | * All rights reserved.␊ |
39 | */␊ |
40 | ␊ |
41 | #include "memory.h"␊ |
42 | ␊ |
43 | /* Segment Descriptor␊ |
44 | *␊ |
45 | * 31 24 19 16 7 0␊ |
46 | * ------------------------------------------------------------␊ |
47 | * | | |B| |A| | | |1|0|E|W|A| |␊ |
48 | * | BASE 31..24 |G|/|0|V| LIMIT |P|DPL| TYPE | BASE 23:16 |␊ |
49 | * | | |D| |L| 19..16| | |1|1|C|R|A| |␊ |
50 | * ------------------------------------------------------------␊ |
51 | * | | |␊ |
52 | * | BASE 15..0 | LIMIT 15..0 |␊ |
53 | * | | |␊ |
54 | * ------------------------------------------------------------␊ |
55 | */␊ |
56 | ␊ |
57 | struct seg_desc {␊ |
58 | unsigned short limit_15_0;␊ |
59 | unsigned short base_15_0;␊ |
60 | unsigned char base_23_16;␊ |
61 | unsigned char bit_15_8;␊ |
62 | unsigned char bit_23_16;␊ |
63 | unsigned char base_31_24;␊ |
64 | };␊ |
65 | ␊ |
66 | // turbo - GDT must be in first 64k segment␊ |
67 | struct seg_desc __attribute__ ((section("__INIT,__data"))) Gdt[ NGDTENT ] = {␊ |
68 | /* 0x0 : null */␊ |
69 | {0x0000, 0x0000, 0x00, 0x00, 0x00, 0x00},␊ |
70 | ␊ |
71 | /* 0x8 : boot protected mode 32-bit code segment␊ |
72 | byte granularity, 1MB limit, MEMBASE offset */␊ |
73 | //{0xFFFF, MEMBASE, 0x00, 0x9E, 0x4F, 0x00}, ␊ |
74 | ␉{0xFFFF, 0x0000, 0x00, 0x9E, 0xCF, 0x00},␊ |
75 | ␊ |
76 | /* 0x10 : boot protected mode data segment␊ |
77 | page granularity, 4GB limit, MEMBASE offset */␊ |
78 | {0xFFFF, MEMBASE, 0x00, 0x92, 0xCF, 0x00},␊ |
79 | ␊ |
80 | /* 0x18 : boot protected mode 16-bit code segment␊ |
81 | byte granularity, 1MB limit, MEMBASE offset */␊ |
82 | {0xFFFF, MEMBASE, 0x00, 0x9E, 0x0F, 0x00},␊ |
83 | ␊ |
84 | /* 0x20 : kernel init 32-bit data segment␊ |
85 | page granularity, 4GB limit, zero offset */␊ |
86 | {0xFFFF, 0x0000, 0x00, 0x92, 0xCF, 0x00},␊ |
87 | ␊ |
88 | /* 0x28 : kernel init 32-bit code segment␊ |
89 | page granularity, 4GB limit, zero offset */␊ |
90 | {0xFFFF, 0x0000, 0x00, 0x9E, 0xCF, 0x00},␊ |
91 | ␊ |
92 | /* 0x30 : boot real mode data/stack segment␊ |
93 | byte granularity, 64K limit, MEMBASE offset, expand-up */␊ |
94 | {0xFFFF, MEMBASE, 0x00, 0x92, 0x00, 0x00}, ␊ |
95 | };␊ |
96 | |