sys/i386/isa/rtc.h

/*-
 * Copyright (c) 1990 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.
 *
 *      from: @(#)rtc.h 7.1 (Berkeley) 5/12/91
 *      $Id$
 */

/*
 * RTC Register locations
 */

#define RTC_SEC         0x00    /* seconds */
#define RTC_SECALRM     0x01    /* seconds alarm */
#define RTC_MIN         0x02    /* minutes */
#define RTC_MINALRM     0x03    /* minutes alarm */
#define RTC_HRS         0x04    /* hours */
#define RTC_HRSALRM     0x05    /* hours alarm */
#define RTC_WDAY        0x06    /* week day */
#define RTC_DAY         0x07    /* day of month */
#define RTC_MONTH       0x08    /* month of year */
#define RTC_YEAR        0x09    /* month of year */
#define RTC_STATUSA     0x0a    /* status register A */
#define  RTCSA_TUP       0x80   /* time update, don't look now */

#define RTC_STATUSB     0x0b    /* status register B */

#define RTC_INTR        0x0c    /* status register C (R) interrupt source */
#define  RTCIR_UPDATE    0x10   /* update intr */
#define  RTCIR_ALARM     0x20   /* alarm intr */
#define  RTCIR_PERIOD    0x40   /* periodic intr */
#define  RTCIR_INT       0x80   /* interrupt output signal */

#define RTC_STATUSD     0x0d    /* status register D (R) Lost Power */
#define  RTCSD_PWR       0x80   /* clock lost power */

#define RTC_DIAG        0x0e    /* status register E - bios diagnostic */
#define RTCDG_BITS      "\020\010clock_battery\007ROM_cksum\006config_unit\005memory_size\004fixed_disk\003invalid_time"

#define RTC_RESET       0x0f    /* status register F - reset code byte */
#define  RTCRS_RST       0x00           /* normal reset */
#define  RTCRS_LOAD      0x04           /* load system */

#define RTC_FDISKETTE   0x10    /* diskette drive type in upper/lower nibble */
#define  RTCFDT_NONE     0              /* none present */
#define  RTCFDT_360K     0x10           /* 360K */
#define  RTCFDT_12M      0x20           /* 1.2M */
#define  RTCFDT_144M     0x40           /* 1.44M */

#define RTC_BASELO      0x15    /* low byte of basemem size */
#define RTC_BASEHI      0x16    /* high byte of basemem size */
#define RTC_EXTLO       0x17    /* low byte of extended mem size */
#define RTC_EXTHI       0x18    /* low byte of extended mem size */

#define RTC_CENTURY     0x32    /* current century - please increment in Dec99*/