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/* $OpenBSD: clock.c,v 1.4 2003/08/20 00:26:00 deraadt Exp $ */
#include <sys/types.h>
#include <machine/prom.h>
#include "stand.h"
#include "libsa.h"
/*
* 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)
#define YEAR0 68
/*
* 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(int sec, int min, int hour, int day, int mon, int year)
{
register 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);
}
time_t
getsecs(void)
{
struct mvmeprom_time m;
mvmeprom_rtc_rd(&m);
return (chiptotime(m.sec_BCD, m.min_BCD, m.hour_BCD, m.day_BCD,
m.month_BCD, m.year_BCD));
}
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