118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
/* $NetBSD: clock.c,v 1.2 1998/08/22 10:55:36 scw Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
* Copyright (c) 1994 Gordon W. Ross
|
|
* Copyright (c) 1993 Adam Glass
|
|
*
|
|
* This software was developed by the Computer Systems Engineering group
|
|
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
|
|
* contributed to Berkeley.
|
|
*
|
|
* All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Lawrence Berkeley Laboratory.
|
|
*
|
|
* 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 by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
|
|
*
|
|
* @(#)clock.c 8.1 (Berkeley) 6/11/93
|
|
*/
|
|
|
|
/*
|
|
* Clock driver.
|
|
*/
|
|
|
|
#include "sboot.h"
|
|
#include "clockreg.h"
|
|
static struct clockreg *clockreg = (struct clockreg *) CLOCK_ADDR;
|
|
|
|
/*
|
|
* BCD to decimal and decimal to BCD.
|
|
*/
|
|
#define FROMBCD(x) (((x) >> 4) * 10 + ((x) & 0xf))
|
|
#define TOBCD(x) (((x) / 10 * 16) + ((x) % 10))
|
|
|
|
#define SECDAY (24 * 60 * 60)
|
|
#define SECYR (SECDAY * 365)
|
|
#define LEAPYEAR(y) (((y) & 3) == 0)
|
|
|
|
/*
|
|
* This code is defunct after 2068.
|
|
* Will Unix still be here then??
|
|
*/
|
|
const short dayyr[12] =
|
|
{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
|
|
|
|
static u_long chiptotime(sec, min, hour, day, mon, year)
|
|
int sec, min, hour, day, mon, year;
|
|
{
|
|
int days, yr;
|
|
|
|
sec = FROMBCD(sec);
|
|
min = FROMBCD(min);
|
|
hour = FROMBCD(hour);
|
|
day = FROMBCD(day);
|
|
mon = FROMBCD(mon);
|
|
year = FROMBCD(year) + YEAR0;
|
|
if (year < 70) year = 70;
|
|
|
|
/* simple sanity checks */
|
|
if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31)
|
|
return (0);
|
|
days = 0;
|
|
for (yr = 70; yr < year; yr++)
|
|
days += LEAPYEAR(yr) ? 366 : 365;
|
|
days += dayyr[mon - 1] + day - 1;
|
|
if (LEAPYEAR(yr) && mon > 2)
|
|
days++;
|
|
/* now have days since Jan 1, 1970; the rest is easy... */
|
|
return (days * SECDAY + hour * 3600 + min * 60 + sec);
|
|
}
|
|
|
|
/*
|
|
* Set up the system's time, given a `reasonable' time value.
|
|
*/
|
|
u_long time()
|
|
{
|
|
struct clockreg *cl = clockreg;
|
|
int sec, min, hour, day, mon, year;
|
|
|
|
cl->cl_csr |= CLK_READ; /* enable read (stop time) */
|
|
sec = cl->cl_sec;
|
|
min = cl->cl_min;
|
|
hour = cl->cl_hour;
|
|
day = cl->cl_mday;
|
|
mon = cl->cl_month;
|
|
year = cl->cl_year;
|
|
cl->cl_csr &= ~CLK_READ; /* time wears on */
|
|
return(chiptotime(sec, min, hour, day, mon, year));
|
|
}
|