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
29 Copyright 1988, 1989, 1990, 1991, 1992
30 by Intel Corporation, Santa Clara, California.
34 Permission to use, copy, modify, and distribute this software and
35 its documentation for any purpose and without fee is hereby
36 granted, provided that the above copyright notice appears in all
37 copies and that both the copyright notice and this permission notice
38 appear in supporting documentation, and that the name of Intel
39 not be used in advertising or publicity pertaining to distribution
40 of the software without specific, written prior permission.
42 INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
43 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
44 IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
45 CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
46 LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
47 NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
48 WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
51 #include <sys/cdefs.h>
52 __FBSDID("$FreeBSD$");
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 */
89 * The limit of boot data should be more than or equal to 0x9FFFF
90 * for saving BIOS parameter and EPSON machine ID into 2'nd T-VRAM,
91 * because base address is normally 0x10000.
93 {0xFFFF, RUN, RUN, 0x92, 0x4F, 0x0}, /* 0x20 : boot data */
94 {0xFFFF, RUN, RUN, 0x9E, 0x0, 0x0}, /* 0x28 : boot code, 16 bits */
95 {0xFFFF, 0x0, 0x0, 0x92, 0x0, 0x0}, /* 0x30 : boot data, 16 bits */
98 {}, /* BIOS_TMP_INDEX = 7 : null */
99 {}, /* TSS_INDEX = 8 : null */
100 {0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* DS_286_INDEX = 9 */
101 {0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* ES_286_INDEX = 10 */
102 {}, /* Unused = 11 : null */
103 {0x7FFF, 0x8000, 0xB, 0xB2, 0x40, 0x0}, /* COLOR_INDEX = 12 */
104 {0x7FFF, 0x0, 0xB, 0xB2, 0x40, 0x0}, /* MONO_INDEX = 13 */
105 {0xFFFF, RUN, RUN, 0x9A, 0x40, 0x0}, /* DB_CS_INDEX = 14 */
106 {0xFFFF, RUN, RUN, 0x9A, 0x0, 0x0}, /* DB_CS16_INDEX = 15 */
107 {0xFFFF, RUN, RUN, 0x92, 0x40, 0x0}, /* DB_DS_INDEX = 16 */
108 {8*18-1, RUN, RUN, 0x92, 0x40, 0x0}, /* GDT_INDEX = 17 */
109 #endif /* BDE_DEBUGGER */
114 unsigned short entry_15_0;
115 unsigned short selector;
116 unsigned char padding;
117 unsigned char p_dpl_type;
118 unsigned short entry_31_16;
121 struct idt_desc Idt[] = {
122 {}, /* Null (int 0) */
123 {RUN, 0x70, 0, 0x8E, 0}, /* DEBUG_VECTOR = 1 */
124 {}, /* Null (int 2) */
125 {RUN, 0x70, 0, 0xEE, 0}, /* BREAKPOINT_VECTOR = 3 */
127 #endif /* BDE_DEBUGGER */
130 unsigned short limit;
131 unsigned short base_low;
132 unsigned short base_high;
135 struct pseudo_desc Gdtr = { sizeof Gdt - 1, RUN, RUN };
137 struct pseudo_desc Idtr_prot = { sizeof Idt - 1, RUN, RUN };
138 struct pseudo_desc Idtr_real = { 0x400 - 1, 0x0, 0x0 };
142 * All initialized data is defined in one file to reduce space wastage from
145 char *devs[] = { "wd", "dk", "fd", "wt", "da", "dk", "fd", 0 };
146 unsigned tw_chars = 0x5C2D2F7C; /* "\-/|" */