![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to table.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Net/2] / Net2 / arch / i386 / boot|
Return to table.c CVS log | Up to [Net/2] / Net2 / arch / i386 / boot |
1.1 root 1: /*
2: * Ported to boot 386BSD by Julian Elischer ([email protected]) Sept 1992
3: *
4: * Mach Operating System
5: * Copyright (c) 1992, 1991 Carnegie Mellon University
6: * All Rights Reserved.
7: *
8: * Permission to use, copy, modify and distribute this software and its
9: * documentation is hereby granted, provided that both the copyright
10: * notice and this permission notice appear in all copies of the
11: * software, derivative works or modified versions, and any portions
12: * thereof, and that both notices appear in supporting documentation.
13: *
14: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
16: * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17: *
18: * Carnegie Mellon requests users of this software to return to
19: *
20: * Software Distribution Coordinator or [email protected]
21: * School of Computer Science
22: * Carnegie Mellon University
23: * Pittsburgh PA 15213-3890
24: *
25: * any improvements or extensions that they make and grant Carnegie Mellon
26: * the rights to redistribute these changes.
27: */
28:
29: /*
30: * HISTORY
1.1.1.2 ! root 31: * table.c,v
! 32: * Revision 1.2 1993/07/11 12:02:25 andrew
! 33: * Fixes from bde, including support for loading @ any MB boundary (e.g. a
! 34: * kernel linked for 0xfe100000 will load at the 1MB mark) and read-ahead
! 35: * buffering to speed booting from floppies. Also works with aha174x
! 36: * controllers in enhanced mode.
! 37: *
! 38: *
! 39: * 93/06/28 bde
! 40: * Remove remaining magic numbers that depend on the load address.
! 41: * IDTs and many more GDT entries to support my debugger.
! 42: *
! 43: * 93/06/27 bde
! 44: * Remove unused Gdtr2.
! 45: * Remove some magic numbers from Gdtr and Gdt. The boot loader may
! 46: * override the ones related to the standard load address of 0x90000.
! 47: *
! 48: * Revision 1.1 1993/03/21 18:08:47 cgd
1.1 root 49: * after 0.2.2 "stable" patches applied
50: *
51: * Revision 2.2 92/04/04 11:36:43 rpd
52: * Fix Intel Copyright as per B. Davies authorization.
53: * [92/04/03 rvb]
54: * Taken from 2.5 bootstrap.
55: * [92/03/30 rvb]
56: *
57: * Revision 2.2 91/04/02 14:42:22 mbj
58: * Add Intel copyright
59: * [90/02/09 rvb]
60: *
61: */
62:
63: /*
64: Copyright 1988, 1989, 1990, 1991, 1992
65: by Intel Corporation, Santa Clara, California.
66:
67: All Rights Reserved
68:
69: Permission to use, copy, modify, and distribute this software and
70: its documentation for any purpose and without fee is hereby
71: granted, provided that the above copyright notice appears in all
72: copies and that both the copyright notice and this permission notice
73: appear in supporting documentation, and that the name of Intel
74: not be used in advertising or publicity pertaining to distribution
75: of the software without specific, written prior permission.
76:
77: INTEL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
78: INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
79: IN NO EVENT SHALL INTEL BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
80: CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
81: LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
82: NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
83: WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
84: */
85:
86: /* Segment Descriptor
87: *
88: * 31 24 19 16 7 0
89: * ------------------------------------------------------------
90: * | | |B| |A| | | |1|0|E|W|A| |
91: * | BASE 31..24 |G|/|0|V| LIMIT |P|DPL| TYPE | BASE 23:16 |
92: * | | |D| |L| 19..16| | |1|1|C|R|A| |
93: * ------------------------------------------------------------
94: * | | |
95: * | BASE 15..0 | LIMIT 15..0 |
96: * | | |
97: * ------------------------------------------------------------
98: */
99:
100: struct seg_desc {
101: unsigned short limit_15_0;
102: unsigned short base_15_0;
103: unsigned char base_23_16;
1.1.1.2 ! root 104: unsigned char p_dpl_type;
! 105: unsigned char g_b_a_limit;
1.1 root 106: unsigned char base_31_24;
107: };
108:
1.1.1.2 ! root 109: #define RUN 0 /* not really 0, but filled in at boot time */
1.1 root 110:
1.1.1.2 ! root 111: struct seg_desc Gdt[] = {
1.1 root 112: {0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, /* 0x0 : null */
113: {0xFFFF, 0x0, 0x0, 0x9F, 0xCF, 0x0}, /* 0x08 : kernel code */
1.1.1.2 ! root 114: /* 0x9E? */
1.1 root 115: {0xFFFF, 0x0, 0x0, 0x93, 0xCF, 0x0}, /* 0x10 : kernel data */
1.1.1.2 ! root 116: /* 0x92? */
! 117: {0xFFFF, RUN, RUN, 0x9E, 0x40, 0x0}, /* 0x18 : boot code */
! 118: {0xFFFF, RUN, RUN, 0x92, 0x40, 0x0}, /* 0x20 : boot data */
! 119: {0xFFFF, RUN, RUN, 0x9E, 0x0, 0x0}, /* 0x28 : boot code, 16 bits */
! 120: /* More for bdb. */
! 121: {}, /* BIOS_CS_INDEX = 6 : null */
! 122: {}, /* BIOS_TMP_INDEX = 7 : null */
! 123: {}, /* TSS_INDEX = 8 : null */
! 124: {0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* DS_286_INDEX = 9 */
! 125: {0xFFFF, 0x0, 0x0, 0xB2, 0x40, 0x0}, /* ES_286_INDEX = 10 */
! 126: {}, /* Unused = 11 : null */
! 127: {0x7FFF, 0x8000, 0xB, 0xB2, 0x40, 0x0}, /* COLOR_INDEX = 12 */
! 128: {0x7FFF, 0x0, 0xB, 0xB2, 0x40, 0x0}, /* MONO_INDEX = 13 */
! 129: {0xFFFF, RUN, RUN, 0x9A, 0x40, 0x0}, /* DB_CS_INDEX = 14 */
! 130: {0xFFFF, RUN, RUN, 0x9A, 0x0, 0x0}, /* DB_CS16_INDEX = 15 */
! 131: {0xFFFF, RUN, RUN, 0x92, 0x40, 0x0}, /* DB_DS_INDEX = 16 */
! 132: {8*18-1, RUN, RUN, 0x92, 0x40, 0x0}, /* GDT_INDEX = 17 */
! 133: };
! 134:
! 135: struct idt_desc {
! 136: unsigned short entry_15_0;
! 137: unsigned short selector;
! 138: unsigned char padding;
! 139: unsigned char p_dpl_type;
! 140: unsigned short entry_31_16;
! 141: };
! 142:
! 143: struct idt_desc Idt[] = {
! 144: {}, /* Null (int 0) */
! 145: {RUN, 0x70, 0, 0x8E, 0}, /* DEBUG_VECTOR = 1 */
! 146: {}, /* Null (int 2) */
! 147: {RUN, 0x70, 0, 0xEE, 0}, /* BREAKPOINT_VECTOR = 3 */
! 148: };
1.1 root 149:
150: struct pseudo_desc {
151: unsigned short limit;
152: unsigned short base_low;
153: unsigned short base_high;
154: };
155:
1.1.1.2 ! root 156: struct pseudo_desc Gdtr = { sizeof Gdt - 1, RUN, RUN };
! 157: struct pseudo_desc Idtr_prot = { sizeof Idt - 1, RUN, RUN };
! 158: struct pseudo_desc Idtr_real = { 0x400 - 1, 0x0, 0x0 };
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.