1 /* $OpenBSD: nvram.h,v 1.1 2007/08/02 16:40:27 deraadt 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 */ 94