1 /* $OpenBSD: nvram.h,v 1.7 2004/06/09 10:17:10 art Exp $ */
2 /* $NetBSD: nvram.h,v 1.5 1995/05/05 22:08:43 mycroft Exp $ */
3
4 /*-
5 * Copyright (c) 1990, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * William Jolitz.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * @(#)rtc.h 8.1 (Berkeley) 6/11/93
36 */
37
38 /*
39 * The following information is found in the non-volatile RAM in the
40 * MC146818A (or DS1287A or other compatible) RTC on AT-compatible PCs.
41 */
42
43 /* NVRAM byte 0: bios diagnostic */
44 #define NVRAM_DIAG (MC_NVRAM_START + 0) /* RTC offset 0xe */
45
46 #define NVRAM_DIAG_BITS "\020\010clock_battery\007ROM_cksum\006config_unit\005memory_size\004fixed_disk\003invalid_time"
47
48 /* NVRAM byte 1: reset code */
49 #define NVRAM_RESET (MC_NVRAM_START + 1) /* RTC offset 0xf */
50
51 #define NVRAM_RESET_RST 0x00 /* normal reset */
52 #define NVRAM_RESET_LOAD 0x04 /* load system */
53 #define NVRAM_RESET_JUMP 0x0a /* jump through 40:67 */
54
55 /* NVRAM byte 2: diskette drive type in upper/lower nibble */
56 #define NVRAM_DISKETTE (MC_NVRAM_START + 2) /* RTC offset 0x10 */
57
58 #define NVRAM_DISKETTE_NONE 0 /* none present */
59 #define NVRAM_DISKETTE_360K 0x10 /* 360K */
60 #define NVRAM_DISKETTE_12M 0x20 /* 1.2M */
61 #define NVRAM_DISKETTE_720K 0x30 /* 720K */
62 #define NVRAM_DISKETTE_144M 0x40 /* 1.44M */
63 #define NVRAM_DISKETTE_TYPE5 0x50 /* 2.88M, presumably */
64 #define NVRAM_DISKETTE_TYPE6 0x60 /* 2.88M */
65
66 /* NVRAM byte 6: equipment type */
67 #define NVRAM_EQUIPMENT (MC_NVRAM_START + 6)
68
69 #define NVRAM_EQUIPMENT_FLOPPY 0x01 /* floppy installed */
70 #define NVRAM_EQUIPMENT_FPU 0x02 /* FPU installed */
71 #define NVRAM_EQUIPMENT_KBD 0x04 /* keyboard installed */
72 #define NVRAM_EQUIPMENT_DISPLAY 0x08 /* display installed */
73 #define NVRAM_EQUIPMENT_EGAVGA 0x00 /* EGA or VGA */
74 #define NVRAM_EQUIPMENT_COLOR40 0x10 /* 40 column color */
75 #define NVRAM_EQUIPMENT_COLOR80 0x20 /* 80 column color */
76 #define NVRAM_EQUIPMENT_MONO80 0x30 /* 80 column mono */
77 #define NVRAM_EQUIPMENT_MONITOR 0x30 /* mask for monitor type */
78 #define MVRAM_EQUIPMENT_NFDS 0xC0 /* mask for # of floppies */
79
80 /* NVRAM bytes 7 & 8: base memory size */
81 #define NVRAM_BASELO (MC_NVRAM_START + 7) /* low byte; RTC off. 0x15 */
82 #define NVRAM_BASEHI (MC_NVRAM_START + 8) /* high byte; RTC off. 0x16 */
83
84 /* NVRAM bytes 9 & 10: extended memory size */
85 #define NVRAM_EXTLO (MC_NVRAM_START + 9) /* low byte; RTC off. 0x17 */
86 #define NVRAM_EXTHI (MC_NVRAM_START + 10) /* high byte; RTC off. 0x18 */
87
88 /* NVRAM bytes 34 and 35: extended memory POSTed size */
89 #define NVRAM_PEXTLO (MC_NVRAM_START + 34) /* low byte; RTC off. 0x30 */
90 #define NVRAM_PEXTHI (MC_NVRAM_START + 35) /* high byte; RTC off. 0x31 */
91
92 /* NVRAM byte 36: current century. (please increment in Dec99!) */
93 #define NVRAM_CENTURY (MC_NVRAM_START + 36) /* RTC offset 0x32 */