2 * Mach Operating System
3 * Copyright (c) 1992, 1991 Carnegie Mellon University
6 * Permission to use, copy, modify and distribute this software and its
7 * documentation is hereby granted, provided that both the copyright
8 * notice and this permission notice appear in all copies of the
9 * software, derivative works or modified versions, and any portions
10 * thereof, and that both notices appear in supporting documentation.
12 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
13 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
14 * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
16 * Carnegie Mellon requests users of this software to return to
18 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
19 * School of Computer Science
20 * Carnegie Mellon University
21 * Pittsburgh PA 15213-3890
23 * any improvements or extensions that they make and grant Carnegie Mellon
24 * the rights to redistribute these changes.
26 * from: Mach, Revision 2.2 92/04/04 11:36:43 rpd
27 * $FreeBSD: src/sys/i386/boot/biosboot/table.c,v 1.20 1999/08/28 00:43:15 peter Exp $
28 * $DragonFly: src/sys/i386/boot/biosboot/Attic/table.c,v 1.2 2003/06/17 04:28:34 dillon Exp $
32 Copyright 1988, 1989, 1990, 1991, 1992
33 by Intel Corporation, Santa Clara, California.
37 Permission to use, copy, modify, and distribute this software and
38 its documentation for any purpose and without fee is hereby
39 granted, provided that the above copyright notice appears in all
40 copies and that both the copyright notice and this permission notice
41 appear in supporting documentation, and that the name of Intel
42 not be used in advertising or publicity pertaining to distribution
43 of the software without specific, written prior permission.
45 INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
46 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
47 IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
48 CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
49 LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
50 NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
51 WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
59 * ------------------------------------------------------------
60 * | | |B| |A| | | |1|0|E|W|A| |
61 * | BASE 31..24 |G|/|0|V| LIMIT |P|DPL| TYPE | BASE 23:16 |
62 * | | |D| |L| 19..16| | |1|1|C|R|A| |
63 * ------------------------------------------------------------
65 * | BASE 15..0 | LIMIT 15..0 |
67 * ------------------------------------------------------------
71 unsigned short limit_15_0;
72 unsigned short base_15_0;
73 unsigned char base_23_16;
74 unsigned char p_dpl_type;
75 unsigned char g_b_a_limit;
76 unsigned char base_31_24;
79 #define RUN 0 /* not really 0, but filled in at boot time */
81 struct seg_desc Gdt[] = {
82 {0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* 0x0 : null */
83 {0xFFFF, 0x0, 0x0, 0x9F, 0xCF, 0x0}, /* 0x08 : kernel code */
85 {0xFFFF, 0x0, 0x0, 0x93, 0xCF, 0x0}, /* 0x10 : kernel data */
87 {0xFFFF, RUN, RUN, 0x9E, 0x40, 0x0}, /* 0x18 : boot code */
88 {0xFFFF, RUN, RUN, 0x92, 0x40, 0x0}, /* 0x20 : boot data */
89 {0xFFFF, RUN, RUN, 0x9E, 0x0, 0x0}, /* 0x28 : boot code, 16 bits */
90 {0xFFFF, 0x0, 0x0, 0x92, 0x0, 0x0}, /* 0x30 : boot data, 16 bits */
93 {}, /* BIOS_TMP_INDEX = 7 : null */
94 {}, /* TSS_INDEX = 8 : null */
95 {0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* DS_286_INDEX = 9 */
96 {0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* ES_286_INDEX = 10 */
97 {}, /* Unused = 11 : null */
98 {0x7FFF, 0x8000, 0xB, 0xB2, 0x40, 0x0}, /* COLOR_INDEX = 12 */
99 {0x7FFF, 0x0, 0xB, 0xB2, 0x40, 0x0}, /* MONO_INDEX = 13 */
100 {0xFFFF, RUN, RUN, 0x9A, 0x40, 0x0}, /* DB_CS_INDEX = 14 */
101 {0xFFFF, RUN, RUN, 0x9A, 0x0, 0x0}, /* DB_CS16_INDEX = 15 */
102 {0xFFFF, RUN, RUN, 0x92, 0x40, 0x0}, /* DB_DS_INDEX = 16 */
103 {8*18-1, RUN, RUN, 0x92, 0x40, 0x0}, /* GDT_INDEX = 17 */
104 #endif /* BDE_DEBUGGER */
109 unsigned short entry_15_0;
110 unsigned short selector;
111 unsigned char padding;
112 unsigned char p_dpl_type;
113 unsigned short entry_31_16;
116 struct idt_desc Idt[] = {
117 {}, /* Null (int 0) */
118 {RUN, 0x70, 0, 0x8E, 0}, /* DEBUG_VECTOR = 1 */
119 {}, /* Null (int 2) */
120 {RUN, 0x70, 0, 0xEE, 0}, /* BREAKPOINT_VECTOR = 3 */
122 #endif /* BDE_DEBUGGER */
125 unsigned short limit;
126 unsigned short base_low;
127 unsigned short base_high;
130 struct pseudo_desc Gdtr = { sizeof Gdt - 1, RUN, RUN };
132 struct pseudo_desc Idtr_prot = { sizeof Idt - 1, RUN, RUN };
133 struct pseudo_desc Idtr_real = { 0x400 - 1, 0x0, 0x0 };
137 * All initialized data is defined in one file to reduce space wastage from
140 char *devs[] = { "wd", "dk", "fd", "wt", "da", 0 };
141 unsigned tw_chars = 0x5C2D2F7C; /* "\-/|" */