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/* $NetBSD: nvram.h,v 1.5 1995/05/05 22:08:43 mycroft 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 */
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