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Introduce a boot environment variable (clock_compat_osf1) which can

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be set to 1 to make FreeBSD and Tru64 coexist peacefully on a dual
boot system and not clobber each other's year in the TOY clock.
(Tru64 uses an offset 52 years higher than one would expect)

Obtained from: NetBSD
MFC After: 1 week
This commit is contained in:
Andrew Gallatin 2001-11-03 17:22:50 +00:00
parent b8ea5f7f0f
commit cd4e23cead
2 changed files with 28 additions and 13 deletions
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27
sys/alpha/alpha/clock.c
View file

@ -70,6 +70,17 @@
#define SECDAY ((unsigned)(24*SECHOUR)) /* seconds per day */
#define SECYR ((unsigned)(365*SECDAY)) /* seconds per common year */
/*
* According to OSF/1's /usr/sys/include/arch/alpha/clock.h,
* the console adjusts the RTC years 13..19 to 93..99 and
* 20..40 to 00..20. (historical reasons?)
* DEC Unix uses an offset to the year to stay outside
* the dangerous area for the next couple of years.
*/
#define UNIX_YEAR_OFFSET 52 /* 41=>1993, 12=>2064 */
static int clock_year_offset = 0;
/*
* 32-bit time_t's can't reach leap years before 1904 or after 2036, so we
* can use a simple formula for leap years.
@ -472,7 +483,7 @@ inittodr(base)
register int days, yr;
struct clocktime ct;
time_t deltat;
int badbase;
int badbase, clock_compat_osf1;
int s;
struct timespec ts;
@ -484,9 +495,22 @@ inittodr(base)
} else
badbase = 0;
if (getenv_int("clock_compat_osf1", &clock_compat_osf1)) {
if (clock_compat_osf1)
clock_year_offset = UNIX_YEAR_OFFSET;
}
CLOCK_GET(clockdev, base, &ct);
clockinitted = 1;
#ifdef DEBUG
printf("readclock: %d/%d/%d/%d/%d/%d\n", ct.year, ct.mon, ct.day,
ct.hour, ct.min, ct.sec);
#endif
ct.year += clock_year_offset;
if (ct.year < 70)
ct.year += 100;
/* simple sanity checks */
if (ct.year < 70 || ct.mon < 1 || ct.mon > 12 || ct.day < 1 ||
ct.day > 31 || ct.hour > 23 || ct.min > 59 || ct.sec > 59) {
@ -595,6 +619,7 @@ resettodr()
ct.min = t / SECMIN;
ct.sec = t % SECMIN;
ct.year = (ct.year - clock_year_offset) % 100;
CLOCK_SET(clockdev, &ct);
}

14
sys/dev/dec/mcclock.c
View file

@ -84,13 +84,6 @@ mcclock_get(device_t dev, time_t base, struct clocktime *ct)
ct->day = regs[MC_DOM];
ct->mon = regs[MC_MONTH];
ct->year = regs[MC_YEAR];
/*
* This chip is not y2k compliant- If it's less than
* 70, we're clearly past the year 2000.
*/
if (ct->year < 70) {
ct->year += 100;
}
}
/*
@ -112,11 +105,8 @@ mcclock_set(device_t dev, struct clocktime *ct)
regs[MC_DOW] = ct->dow;
regs[MC_DOM] = ct->day;
regs[MC_MONTH] = ct->mon;
/*
* This chip is not y2k compliant- write it with
* no more than two digits.
*/
regs[MC_YEAR] = ct->year % 100;
regs[MC_YEAR] = ct->year;
s = splclock();
MC146818_PUTTOD(dev, &regs);
splx(s);