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: }
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