118 lines
4.0 KiB
C
118 lines
4.0 KiB
C
/* $NetBSD: clock.c,v 1.1.1.1 1995/07/25 23:12:28 chuck Exp $ */
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/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1994 Gordon W. Ross
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* Copyright (c) 1993 Adam Glass
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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*
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* All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Lawrence Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)clock.c 8.1 (Berkeley) 6/11/93
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*/
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/*
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* Clock driver.
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*/
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#include "sboot.h"
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#include "clockreg.h"
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static struct clockreg *clockreg = (struct clockreg *) CLOCK_ADDR;
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/*
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* BCD to decimal and decimal to BCD.
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*/
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#define FROMBCD(x) (((x) >> 4) * 10 + ((x) & 0xf))
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#define TOBCD(x) (((x) / 10 * 16) + ((x) % 10))
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#define SECDAY (24 * 60 * 60)
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#define SECYR (SECDAY * 365)
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#define LEAPYEAR(y) (((y) & 3) == 0)
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/*
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* This code is defunct after 2068.
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* Will Unix still be here then??
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*/
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const short dayyr[12] =
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{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
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static u_long chiptotime(sec, min, hour, day, mon, year)
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register int sec, min, hour, day, mon, year;
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{
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register int days, yr;
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sec = FROMBCD(sec);
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min = FROMBCD(min);
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hour = FROMBCD(hour);
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day = FROMBCD(day);
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mon = FROMBCD(mon);
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year = FROMBCD(year) + YEAR0;
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if (year < 70) year = 70;
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/* simple sanity checks */
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if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31)
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return (0);
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days = 0;
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for (yr = 70; yr < year; yr++)
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days += LEAPYEAR(yr) ? 366 : 365;
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days += dayyr[mon - 1] + day - 1;
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if (LEAPYEAR(yr) && mon > 2)
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days++;
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/* now have days since Jan 1, 1970; the rest is easy... */
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return (days * SECDAY + hour * 3600 + min * 60 + sec);
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}
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/*
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* Set up the system's time, given a `reasonable' time value.
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*/
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u_long time()
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{
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register struct clockreg *cl = clockreg;
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int sec, min, hour, day, mon, year;
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cl->cl_csr |= CLK_READ; /* enable read (stop time) */
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sec = cl->cl_sec;
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min = cl->cl_min;
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hour = cl->cl_hour;
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day = cl->cl_mday;
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mon = cl->cl_month;
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year = cl->cl_year;
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cl->cl_csr &= ~CLK_READ; /* time wears on */
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return(chiptotime(sec, min, hour, day, mon, year));
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}
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