/*      $NetBSD: nvram.h,v 1.8 2005/12/11 12:17:43 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 */
#define NVRAM_RESET_JUMP        0x0a            /* jump through 40:67 */

/* 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 */