source: branches/minix3-book/include/ibm/bios.h@ 23

Last change on this file since 23 was 4, checked in by Mattia Monga, 14 years ago

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1/* Definitions of several known BIOS addresses. The addresses listed here
2 * are found in three memory areas that have been defined in <ibm/memory.h>.
3 * - the BIOS interrupt vectors
4 * - the BIOS data area
5 * - the motherboard BIOS memory
6 *
7 * Created: March 2005, Jorrit N. Herder
8 */
9
10#ifndef _BIOS_H
11#define _BIOS_H
12
13/* PART I --
14 * The BIOS interrupt vector table (IVT) area (1024 B as of address 0x0000).
15 * Although this area holds 256 interrupt vectors (with jump addresses), some
16 * vectors actually contain important BIOS data. Some addresses are below.
17 */
18#define BIOS_EQUIP_CHECK_ADDR 0x0044
19#define BIOS_EQUIP_CHECK_SIZE 4L
20
21#define BIOS_VIDEO_PARAMS_ADDR 0x0074
22#define BIOS_VIDEO_PARAMS_SIZE 4L
23
24#define BIOS_FLOP_PARAMS_ADDR 0x0078
25#define BIOS_FLOP_PARAMS_SIZE 4L
26
27#define BIOS_HD0_PARAMS_ADDR 0x0104 /* disk 0 parameters */
28#define BIOS_HD0_PARAMS_SIZE 4L
29
30#define BIOS_HD1_PARAMS_ADDR 0x0118 /* disk 1 parameters */
31#define BIOS_HD1_PARAMS_SIZE 4L
32
33/* PART I --
34 * Addresses in the BIOS data area (256 B as of address 0x0400). The addresses
35 * listed below are the most important ones, and the ones that are currently
36 * used. Other addresses may be defined below when new features are added.
37 */
38
39/* Serial ports (COM1-COM4). */
40#define COM1_IO_PORT_ADDR 0x400 /* COM1 port address */
41#define COM1_IO_PORT_SIZE 2L
42#define COM2_IO_PORT_ADDR 0x402 /* COM2 port address */
43#define COM2_IO_PORT_SIZE 2L
44#define COM3_IO_PORT_ADDR 0x404 /* COM3 port address */
45#define COM3_IO_PORT_SIZE 2L
46#define COM4_IO_PORT_ADDR 0x406 /* COM4 port address */
47#define COM4_IO_PORT_SIZE 2L
48
49/* Parallel ports (LPT1-LPT4). */
50#define LPT1_IO_PORT_ADDR 0x408 /* LPT1 port address */
51#define LPT1_IO_PORT_SIZE 2L
52#define LPT2_IO_PORT_ADDR 0x40A /* LPT2 port address */
53#define LPT2_IO_PORT_SIZE 2L
54#define LPT3_IO_PORT_ADDR 0x40C /* LPT3 port address */
55#define LPT3_IO_PORT_SIZE 2L
56#define LPT4_IO_PORT_ADDR 0x40E /* LPT4 port (except on PS/2) */
57#define LPT4_IO_PORT_SIZE 2L
58
59/* Video controller (VDU). */
60#define VDU_SCREEN_COLS_ADDR 0x44A /* VDU nr of screen columns */
61#define VDU_SCREEN_COLS_SIZE 2L
62
63/* Base I/O port address for active 6845 CRT controller. */
64#define VDU_CRT_BASE_ADDR 0x463 /* 3B4h = mono, 3D4h = color */
65#define VDU_CRT_BASE_SIZE 2L
66
67/* Soft reset flags to control shutdown. */
68#define SOFT_RESET_FLAG_ADDR 0x472 /* soft reset flag on Ctl-Alt-Del */
69#define SOFT_RESET_FLAG_SIZE 2L
70#define STOP_MEM_CHECK 0x1234 /* bypass memory tests & CRT init */
71#define PRESERVE_MEMORY 0x4321 /* preserve memory */
72#define SYSTEM_SUSPEND 0x5678 /* system suspend */
73#define MANUFACTURER_TEST 0x9ABC /* manufacturer test */
74#define CONVERTIBLE_POST 0xABCD /* convertible POST loop */
75 /* ... many other values are used during POST */
76
77/* Hard disk parameters. (Also see BIOS interrupt vector table above.) */
78#define NR_HD_DRIVES_ADDR 0x475 /* number of hard disk drives */
79#define NR_HD_DRIVES_SIZE 1L
80
81/* Parallel ports (LPT1-LPT4) timeout values. */
82#define LPT1_TIMEOUT_ADDR 0x478 /* time-out value for LPT1 */
83#define LPT1_TIMEOUT_SIZE 1L
84#define LPT2_TIMEOUT_ADDR 0x479 /* time-out value for LPT2 */
85#define LPT2_TIMEOUT_SIZE 1L
86#define LPT3_TIMEOUT_ADDR 0x47A /* time-out value for LPT3 */
87#define LPT3_TIMEOUT_SIZE 1L
88#define LPT4_TIMEOUT_ADDR 0x47B /* time-out for LPT4 (except PS/2) */
89#define LPT4_TIMEOUT_SIZE 1L
90
91/* Serial ports (COM1-COM4) timeout values. */
92#define COM1_TIMEOUT_ADDR 0x47C /* time-out value for COM1 */
93#define COM1_TIMEOUT_SIZE 1L
94#define COM2_TIMEOUT_ADDR 0x47D /* time-out value for COM2 */
95#define COM2_TIMEOUT_SIZE 1L
96#define COM3_TIMEOUT_ADDR 0x47E /* time-out value for COM3 */
97#define COM3_TIMEOUT_SIZE 1L
98#define COM4_TIMEOUT_ADDR 0x47F /* time-out value for COM4 */
99#define COM4_TIMEOUT_SIZE 1L
100
101/* Video controller (VDU). */
102#define VDU_SCREEN_ROWS_ADDR 0x484 /* screen rows (less 1, EGA+)*/
103#define VDU_SCREEN_ROWS_SIZE 1L
104#define VDU_FONTLINES_ADDR 0x485 /* point height of char matrix */
105#define VDU_FONTLINES_SIZE 2L
106
107/* Video controller (VDU). */
108#define VDU_VIDEO_MODE_ADDR 0x49A /* current video mode */
109#define VDU_VIDEO_MODE_SIZE 1L
110
111/* PART III --
112 * The motherboard BIOS memory contains some known values that are currently
113 * in use. Other sections in the upper memory area (UMA) addresses vary in
114 * size and locus and are not further defined here. A rough map is given in
115 * <ibm/memory.h>.
116 */
117
118/* Machine ID (we're interested in PS/2 and AT models). */
119#define MACHINE_ID_ADDR 0xFFFFE /* BIOS machine ID byte */
120#define MACHINE_ID_SIZE 1L
121#define PS_386_MACHINE 0xF8 /* ID byte for PS/2 modela 70/80 */
122#define PC_AT_MACHINE 0xFC /* PC/AT, PC/XT286, PS/2 models 50/60 */
123
124#endif /* _BIOS_H */
125
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