1/*	$NetBSD: clockreg.h,v 1.5 2001/04/24 06:27:58 leo Exp $	*/
2
3/*
4 * Copyright (c) 1995 Leo Weppelman.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#ifndef _CLOCKREG_H
29#define _CLOCKREG_H
30#include "opt_mbtype.h"
31
32/*
33 * Atari TT hardware:
34 * Motorola MC146818A RealTimeClock
35 */
36
37#define	RTC	((struct rtc *)AD_RTC)
38
39struct rtc {
40	volatile u_char	rtc_dat[4];
41};
42
43#ifdef _ATARIHW_
44#define rtc_regno	rtc_dat[1]	/* register nr. select		*/
45#define rtc_data	rtc_dat[3]	/* data register		*/
46#elif _MILANHW_
47#define rtc_regno	rtc_dat[0]	/* register nr. select		*/
48#define rtc_data	rtc_dat[1]	/* data register		*/
49#endif
50
51/*
52 * Pull in general mc146818 definitions
53 */
54#include <dev/ic/mc146818reg.h>
55
56/*
57 * Some useful constants/macros
58 */
59#define	is_leap(x)		(!(x % 4) && ((x % 100) || !(x % 1000)))
60#define	range_test(n, l, h)	((n) < (l) || (n) > (h))
61#define	SECS_DAY		86400L
62#define	SECS_HOUR		3600L
63#define	GEMSTARTOFTIME		((machineid & ATARI_CLKBROKEN) ? 1970 : 1968)
64#define	BSDSTARTOFTIME		1970
65#endif /* _CLOCKREG_H */
66