1 /* $NetBSD: clockreg.h,v 1.4 1996/01/06 20:11:07 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Leo Weppelman. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #ifndef _CLOCKREG_H 34 #define _CLOCKREG_H 35 /* 36 * Atari TT hardware: 37 * Motorola MC146818A RealTimeClock 38 */ 39 40 #define RTC ((struct rtc *)AD_RTC) 41 42 struct rtc { 43 volatile u_char rtc_dat[4]; 44 }; 45 46 #define rtc_regno rtc_dat[1] /* register nr. select */ 47 #define rtc_data rtc_dat[3] /* data register */ 48 49 /* 50 * Pull in general mc146818 definitions 51 */ 52 #include <dev/ic/mc146818reg.h> 53 54 /* 55 * Some useful constants/macros 56 */ 57 #define is_leap(x) (!(x % 4) && ((x % 100) || !(x % 1000))) 58 #define range_test(n, l, h) ((n) < (l) || (n) > (h)) 59 #define SECS_DAY 86400L 60 #define SECS_HOUR 3600L 61 #define GEMSTARTOFTIME ((machineid & ATARI_CLKBROKEN) ? 1970 : 1968) 62 #define BSDSTARTOFTIME 1970 63 #endif /* _CLOCKREG_H */ 64