1 /* $NetBSD: nvram.h,v 1.8 2005/12/11 12:17:43 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * William Jolitz. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)rtc.h 8.1 (Berkeley) 6/11/93 35 */ 36 37 /* 38 * The following information is found in the non-volatile RAM in the 39 * MC146818A (or DS1287A or other compatible) RTC on AT-compatible PCs. 40 */ 41 42 /* NVRAM byte 0: bios diagnostic */ 43 #define NVRAM_DIAG (MC_NVRAM_START + 0) /* RTC offset 0xe */ 44 45 #define NVRAM_DIAG_BITS "\020\010clock_battery\007ROM_cksum\006config_unit\005memory_size\004fixed_disk\003invalid_time" 46 47 /* NVRAM byte 1: reset code */ 48 #define NVRAM_RESET (MC_NVRAM_START + 1) /* RTC offset 0xf */ 49 50 #define NVRAM_RESET_RST 0x00 /* normal reset */ 51 #define NVRAM_RESET_LOAD 0x04 /* load system */ 52 #define NVRAM_RESET_JUMP 0x0a /* jump through 40:67 */ 53 54 /* NVRAM byte 2: diskette drive type in upper/lower nibble */ 55 #define NVRAM_DISKETTE (MC_NVRAM_START + 2) /* RTC offset 0x10 */ 56 57 #define NVRAM_DISKETTE_NONE 0 /* none present */ 58 #define NVRAM_DISKETTE_360K 0x10 /* 360K */ 59 #define NVRAM_DISKETTE_12M 0x20 /* 1.2M */ 60 #define NVRAM_DISKETTE_720K 0x30 /* 720K */ 61 #define NVRAM_DISKETTE_144M 0x40 /* 1.44M */ 62 #define NVRAM_DISKETTE_TYPE5 0x50 /* 2.88M, presumably */ 63 #define NVRAM_DISKETTE_TYPE6 0x60 /* 2.88M */ 64 65 /* NVRAM byte 6: equipment type */ 66 #define NVRAM_EQUIPMENT (MC_NVRAM_START + 6) 67 68 #define NVRAM_EQUIPMENT_EGAVGA 0x00 /* EGA or VGA */ 69 #define NVRAM_EQUIPMENT_COLOR40 0x10 /* 40 column color */ 70 #define NVRAM_EQUIPMENT_COLOR80 0x20 /* 80 column color */ 71 #define NVRAM_EQUIPMENT_MONO80 0x30 /* 80 column mono */ 72 #define NVRAM_EQUIPMENT_MONITOR 0x30 /* mask for monitor type */ 73 74 /* NVRAM bytes 7 & 8: base memory size */ 75 #define NVRAM_BASELO (MC_NVRAM_START + 7) /* low byte; RTC off. 0x15 */ 76 #define NVRAM_BASEHI (MC_NVRAM_START + 8) /* high byte; RTC off. 0x16 */ 77 78 /* NVRAM bytes 9 & 10: extended memory size */ 79 #define NVRAM_EXTLO (MC_NVRAM_START + 9) /* low byte; RTC off. 0x17 */ 80 #define NVRAM_EXTHI (MC_NVRAM_START + 10) /* high byte; RTC off. 0x18 */ 81 82 /* NVRAM byte 36: current century. (please increment in Dec99!) */ 83 #define NVRAM_CENTURY (MC_NVRAM_START + 36) /* RTC offset 0x32 */ 84
Indexes created Sat Sep 20 22:09:52 GMT 2025