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/* $OpenBSD: clock.h,v 1.8 2008/08/18 23:19:24 miod Exp $ */
/* $NetBSD: clock.h,v 1.4 1999/09/06 19:52:53 ragge Exp $ */
/*
* Copyright (c) 1996 Ludd, University of Lule}, Sweden.
* All rights reserved.
*
* 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 at Ludd, University of
* Lule}, Sweden and its contributors.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*
* Time constants. These are unlikely to change.
*/
#define IS_LEAPYEAR(y) (((y % 4) == 0) && (y % 100))
#define SEC_PER_MIN (60)
#define SEC_PER_HOUR (SEC_PER_MIN * 60)
#define SEC_PER_DAY (SEC_PER_HOUR * 24)
#define DAYSPERYEAR(y) (IS_LEAPYEAR(y) ? 366 : 365)
#define SECPERYEAR(y) (DAYSPERYEAR(y) * SEC_PER_DAY)
#define CLKREAD_OK 0
#define CLKREAD_BAD -1
#define CLKREAD_WARN -2
#define TODRBASE (1 << 28) /* Rumours say it comes from VMS */
#define SEC_OFF 0
#define MIN_OFF 2
#define HR_OFF 4
#define WDAY_OFF 6
#define DAY_OFF 7
#define MON_OFF 8
#define YR_OFF 9
#define CSRA_OFF 10
#define CSRB_OFF 11
#define CSRD_OFF 13
#define CSRA_UIP 0200
#define CSRB_SET 0200
#define CSRB_24 0002
#define CSRB_DM 0004
#define CSRD_VRT 0200
/* Var's used when dealing with clock chip */
extern volatile short *clk_page;
extern int clk_adrshift, clk_tweak;
/* Prototypes */
int generic_clkread(time_t);
void generic_clkwrite(void);
int chip_clkread(time_t);
void chip_clkwrite(void);
int yeartonum(int);
int numtoyear(int);
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