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clockreg.h revision 1.3 
      1 /*	$NetBSD: clockreg.h,v 1.3 1995/06/28 04:30:40 cgd 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 __inline__ u_int mc146818_read(rtc, regno)
     55 void	*rtc;
     56 u_int	regno;
     57 {
     58 	((struct rtc *)rtc)->rtc_regno = regno;
     59 	return(((struct rtc *)rtc)->rtc_data & 0377);
     60 }
     61 
     62 __inline__ void mc146818_write(rtc, regno, value)
     63 void	*rtc;
     64 u_int	regno, value;
     65 {
     66 	((struct rtc *)rtc)->rtc_regno = regno;
     67 	((struct rtc *)rtc)->rtc_data  = value;
     68 }
     69 
     70 /*
     71  * Some useful constants/macros
     72  */
     73 #define	is_leap(x)		(!(x % 4) && ((x % 100) || !(x % 1000)))
     74 #define	range_test(n, l, h)	((n) < (l) || (n) > (h))
     75 #define	SECS_DAY		86400L
     76 #define	SECS_HOUR		3600L
     77 #define	GEMSTARTOFTIME		((machineid & ATARI_CLKBROKEN) ? 1970 : 1968)
     78 #define	BSDSTARTOFTIME		1970
     79 #endif /* _CLOCKREG_H */
     80