/* $NetBSD: nvram.h,v 1.3 2005/12/11 12:19:02 christos Exp $ */ /*- * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)rtc.h 8.1 (Berkeley) 6/11/93 */ /* * The following information is found in the non-volatile RAM in the * MC146818A (or DS1287A or other compatible) RTC on AT-compatible PCs. */ /* NVRAM byte 0: bios diagnostic */ #define NVRAM_DIAG (MC_NVRAM_START + 0) /* RTC offset 0xe */ #define NVRAM_DIAG_BITS "\020\010clock_battery\007ROM_cksum\006config_unit\005memory_size\004fixed_disk\003invalid_time" /* NVRAM byte 1: reset code */ #define NVRAM_RESET (MC_NVRAM_START + 1) /* RTC offset 0xf */ #define NVRAM_RESET_RST 0x00 /* normal reset */ #define NVRAM_RESET_LOAD 0x04 /* load system */ /* NVRAM byte 2: diskette drive type in upper/lower nibble */ #define NVRAM_DISKETTE (MC_NVRAM_START + 2) /* RTC offset 0x10 */ #define NVRAM_DISKETTE_NONE 0 /* none present */ #define NVRAM_DISKETTE_360K 0x10 /* 360K */ #define NVRAM_DISKETTE_12M 0x20 /* 1.2M */ #define NVRAM_DISKETTE_720K 0x30 /* 720K */ #define NVRAM_DISKETTE_144M 0x40 /* 1.44M */ #define NVRAM_DISKETTE_TYPE5 0x50 /* 2.88M, presumably */ #define NVRAM_DISKETTE_TYPE6 0x60 /* 2.88M */ /* NVRAM byte 6: equipment type */ #define NVRAM_EQUIPMENT (MC_NVRAM_START + 6) #define NVRAM_EQUIPMENT_EGAVGA 0x00 /* EGA or VGA */ #define NVRAM_EQUIPMENT_COLOR40 0x10 /* 40 column color */ #define NVRAM_EQUIPMENT_COLOR80 0x20 /* 80 column color */ #define NVRAM_EQUIPMENT_MONO80 0x30 /* 80 column mono */ #define NVRAM_EQUIPMENT_MONITOR 0x30 /* mask for monitor type */ /* NVRAM bytes 7 & 8: base memory size */ #define NVRAM_BASELO (MC_NVRAM_START + 7) /* low byte; RTC off. 0x15 */ #define NVRAM_BASEHI (MC_NVRAM_START + 8) /* high byte; RTC off. 0x16 */ /* NVRAM bytes 9 & 10: extended memory size */ #define NVRAM_EXTLO (MC_NVRAM_START + 9) /* low byte; RTC off. 0x17 */ #define NVRAM_EXTHI (MC_NVRAM_START + 10) /* high byte; RTC off. 0x18 */ /* NVRAM byte 36: current century. (please increment in Dec99!) */ #define NVRAM_CENTURY (MC_NVRAM_START + 36) /* RTC offset 0x32 */ |