84 lines
3.7 KiB
C
84 lines
3.7 KiB
C
/* $NetBSD: nvram.h,v 1.8 2005/12/11 12:17:43 christos Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)rtc.h 8.1 (Berkeley) 6/11/93
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*/
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/*
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* The following information is found in the non-volatile RAM in the
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* MC146818A (or DS1287A or other compatible) RTC on AT-compatible PCs.
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*/
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/* NVRAM byte 0: bios diagnostic */
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#define NVRAM_DIAG (MC_NVRAM_START + 0) /* RTC offset 0xe */
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#define NVRAM_DIAG_BITS "\020\010clock_battery\007ROM_cksum\006config_unit\005memory_size\004fixed_disk\003invalid_time"
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/* NVRAM byte 1: reset code */
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#define NVRAM_RESET (MC_NVRAM_START + 1) /* RTC offset 0xf */
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#define NVRAM_RESET_RST 0x00 /* normal reset */
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#define NVRAM_RESET_LOAD 0x04 /* load system */
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#define NVRAM_RESET_JUMP 0x0a /* jump through 40:67 */
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/* NVRAM byte 2: diskette drive type in upper/lower nibble */
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#define NVRAM_DISKETTE (MC_NVRAM_START + 2) /* RTC offset 0x10 */
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#define NVRAM_DISKETTE_NONE 0 /* none present */
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#define NVRAM_DISKETTE_360K 0x10 /* 360K */
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#define NVRAM_DISKETTE_12M 0x20 /* 1.2M */
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#define NVRAM_DISKETTE_720K 0x30 /* 720K */
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#define NVRAM_DISKETTE_144M 0x40 /* 1.44M */
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#define NVRAM_DISKETTE_TYPE5 0x50 /* 2.88M, presumably */
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#define NVRAM_DISKETTE_TYPE6 0x60 /* 2.88M */
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/* NVRAM byte 6: equipment type */
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#define NVRAM_EQUIPMENT (MC_NVRAM_START + 6)
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#define NVRAM_EQUIPMENT_EGAVGA 0x00 /* EGA or VGA */
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#define NVRAM_EQUIPMENT_COLOR40 0x10 /* 40 column color */
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#define NVRAM_EQUIPMENT_COLOR80 0x20 /* 80 column color */
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#define NVRAM_EQUIPMENT_MONO80 0x30 /* 80 column mono */
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#define NVRAM_EQUIPMENT_MONITOR 0x30 /* mask for monitor type */
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/* NVRAM bytes 7 & 8: base memory size */
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#define NVRAM_BASELO (MC_NVRAM_START + 7) /* low byte; RTC off. 0x15 */
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#define NVRAM_BASEHI (MC_NVRAM_START + 8) /* high byte; RTC off. 0x16 */
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/* NVRAM bytes 9 & 10: extended memory size */
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#define NVRAM_EXTLO (MC_NVRAM_START + 9) /* low byte; RTC off. 0x17 */
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#define NVRAM_EXTHI (MC_NVRAM_START + 10) /* high byte; RTC off. 0x18 */
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/* NVRAM byte 36: current century. (please increment in Dec99!) */
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#define NVRAM_CENTURY (MC_NVRAM_START + 36) /* RTC offset 0x32 */
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