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clock.h revision 1.5 
      1 /*	$NetBSD: clock.h,v 1.5 2000/07/26 11:54:34 ragge Exp $ */
      2 /*
      3  * Copyright (c) 1996 Ludd, University of Lule}, Sweden.
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed at Ludd, University of
     17  *	Lule}, Sweden and its contributors.
     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 /*
     34  * Time constants. These are unlikely to change.
     35  */
     36 #define IS_LEAPYEAR(y) (((y % 4) == 0) && (y % 100))
     37 
     38 #define SEC_PER_MIN	(60)
     39 #define SEC_PER_HOUR	(SEC_PER_MIN * 60)
     40 #define SEC_PER_DAY	(SEC_PER_HOUR * 24)
     41 #define DAYSPERYEAR(y)	(IS_LEAPYEAR(y) ? 366 : 365)
     42 #define SECPERYEAR(y)	(DAYSPERYEAR(y) * SEC_PER_DAY)
     43 
     44 #define CLKREAD_OK	0
     45 #define CLKREAD_BAD	-1
     46 #define CLKREAD_WARN	-2
     47 
     48 #define TODRBASE	(1 << 28) /* Rumours says it comes from VMS */
     49 
     50 #define	SEC_OFF		0
     51 #define	MIN_OFF		2
     52 #define	HR_OFF		4
     53 #define	WDAY_OFF	6
     54 #define	DAY_OFF		7
     55 #define	MON_OFF		8
     56 #define	YR_OFF		9
     57 #define	CSRA_OFF	10
     58 #define	CSRB_OFF	11
     59 #define	CSRD_OFF	13
     60 
     61 #define	CSRA_UIP	0200
     62 #define	CSRB_SET	0200
     63 #define	CSRB_24		0002
     64 #define	CSRB_DM		0004
     65 #define	CSRD_VRT	0200
     66 
     67 /* Var's used when dealing with clock chip */
     68 extern	volatile short *clk_page;
     69 extern	int clk_adrshift, clk_tweak;
     70 
     71 /* Prototypes */
     72 int generic_clkread(time_t);
     73 void generic_clkwrite(void);
     74 int chip_clkread(time_t);
     75 void chip_clkwrite(void);
     76 int yeartonum(int);
     77 int numtoyear(int);
     78