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

1.1       nbrk        1: /*     $OpenBSD: clock.c,v 1.2 2001/07/04 08:31:37 niklas Exp $        */
                      2:
                      3:
                      4: #include <sys/types.h>
                      5: #include <machine/prom.h>
                      6:
                      7: #include "stand.h"
                      8: #include "libsa.h"
                      9:
                     10: /*
                     11:  * BCD to decimal and decimal to BCD.
                     12:  */
                     13: #define FROMBCD(x)      (((x) >> 4) * 10 + ((x) & 0xf))
                     14: #define TOBCD(x)        (((x) / 10 * 16) + ((x) % 10))
                     15:
                     16: #define SECDAY          (24 * 60 * 60)
                     17: #define SECYR           (SECDAY * 365)
                     18: #define LEAPYEAR(y)     (((y) & 3) == 0)
                     19: #define YEAR0          68
                     20:
                     21:
                     22: /*
                     23:  * This code is defunct after 2068.
                     24:  * Will Unix still be here then??
                     25:  */
                     26: const short dayyr[12] =
                     27: {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
                     28:
                     29: static  u_long
                     30: chiptotime(sec, min, hour, day, mon, year)
                     31:        register int sec, min, hour, day, mon, year;
                     32: {
                     33:        register int days, yr;
                     34:
                     35:        sec = FROMBCD(sec);
                     36:        min = FROMBCD(min);
                     37:        hour = FROMBCD(hour);
                     38:        day = FROMBCD(day);
                     39:        mon = FROMBCD(mon);
                     40:        year = FROMBCD(year) + YEAR0;
                     41:        if (year < 70)
                     42:                year = 70;
                     43:
                     44:        /* simple sanity checks */
                     45:        if (year < 70 || mon < 1 || mon > 12 || day < 1 || day > 31)
                     46:                return (0);
                     47:        days = 0;
                     48:        for (yr = 70; yr < year; yr++)
                     49:                days += LEAPYEAR(yr) ? 366 : 365;
                     50:        days += dayyr[mon - 1] + day - 1;
                     51:        if (LEAPYEAR(yr) && mon > 2)
                     52:                days++;
                     53:        /* now have days since Jan 1, 1970; the rest is easy... */
                     54:        return (days * SECDAY + hour * 3600 + min * 60 + sec);
                     55: }
                     56:
                     57: time_t
                     58: getsecs()
                     59: {
                     60:        struct mvmeprom_time m;
                     61:
                     62:        mvmeprom_rtc_rd(&m);
                     63:        return (chiptotime(m.sec_BCD, m.min_BCD, m.hour_BCD, m.day_BCD,
                     64:                        m.month_BCD, m.year_BCD));
                     65: }