Return to clock.c CVS log

Up to [local] / sys / arch / mvme68k / stand / libsa

Annotation of sys/arch/mvme68k/stand/libsa/clock.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: clock.c,v 1.4 2003/08/20 00:26:00 deraadt Exp $ */
                      2:
                      3: #include <sys/types.h>
                      4: #include <machine/prom.h>
                      5:
                      6: #include "stand.h"
                      7: #include "libsa.h"
                      8:
                      9: /*
                     10:  * BCD to decimal and decimal to BCD.
                     11:  */
                     12: #define FROMBCD(x)      (((x) >> 4) * 10 + ((x) & 0xf))
                     13: #define TOBCD(x)        (((x) / 10 * 16) + ((x) % 10))
                     14:
                     15: #define SECDAY          (24 * 60 * 60)
                     16: #define SECYR           (SECDAY * 365)
                     17: #define LEAPYEAR(y)     (((y) & 3) == 0)
                     18: #define YEAR0          68
                     19:
                     20:
                     21: /*
                     22:  * This code is defunct after 2068.
                     23:  * Will Unix still be here then??
                     24:  */
                     25: const short dayyr[12] =
                     26:        {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
                     27:
                     28: static u_long
                     29: chiptotime(int sec, int min, int hour, int day, int mon, int year)
                     30: {
                     31:        register int days, yr;
                     32:
                     33:        sec = FROMBCD(sec);
                     34:        min = FROMBCD(min);
                     35:        hour = FROMBCD(hour);
                     36:        day = FROMBCD(day);
                     37:        mon = FROMBCD(mon);
                     38:        year = FROMBCD(year) + YEAR0;
                     39:        if (year < 70)
                     40:                year = 70;
                     41:
                     42:        /* simple sanity checks */
                     43:        if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31)
                     44:                return (0);
                     45:        days = 0;
                     46:        for (yr = 70; yr < year; yr++)
                     47:                days += LEAPYEAR(yr) ? 366 : 365;
                     48:        days += dayyr[mon - 1] + day - 1;
                     49:        if (LEAPYEAR(yr) && mon > 2)
                     50:                days++;
                     51:        /* now have days since Jan 1, 1970; the rest is easy... */
                     52:        return (days * SECDAY + hour * 3600 + min * 60 + sec);
                     53: }
                     54:
                     55: time_t
                     56: getsecs(void)
                     57: {
                     58:        struct mvmeprom_time m;
                     59:
                     60:        mvmeprom_rtc_rd(&m);
                     61:        return (chiptotime(m.sec_BCD, m.min_BCD, m.hour_BCD, m.day_BCD,
                     62:            m.month_BCD, m.year_BCD));
                     63: }