/*
* inittodr:
*
* Initialize time from the time-of-day register.
*/
#define MINYEAR 2003 /* minimum plausible year */
void
inittodr(time_t base)
{
time_t deltat;
struct timeval rtctime;
struct timespec ts;
int badbase;
if (base < (MINYEAR - 1970) * SECYR) {
printf("WARNING: preposterous time in file system\n");
/* read the system clock anyway */
base = (MINYEAR - 1970) * SECYR;
badbase = 1;
} else
badbase = 0;
if (todr_handle == NULL ||
todr_gettime(todr_handle, &rtctime) != 0 ||
rtctime.tv_sec == 0) {
/*
* Believe the time in the file system for lack of
* anything better, resetting the TODR.
*/
rtctime.tv_sec = base;
rtctime.tv_usec = 0;
if (todr_handle != NULL && !badbase) {
printf("WARNING: preposterous clock chip time\n");
resettodr();
}
ts.tv_sec = rtctime.tv_sec;
ts.tv_nsec = rtctime.tv_usec * 1000;
tc_setclock(&ts);
goto bad;
} else {
ts.tv_sec = rtctime.tv_sec;
ts.tv_nsec = rtctime.tv_usec * 1000;
tc_setclock(&ts);
}
if (!badbase) {
/*
* See if we gained/lost two or more days; if
* so, assume something is amiss.
*/
deltat = rtctime.tv_sec - base;
if (deltat < 0)
deltat = -deltat;
if (deltat < 2 * SECDAY)
return; /* all is well */
printf("WARNING: clock %s %ld days\n",
rtctime.tv_sec < base ? "lost" : "gained",
(long)deltat / SECDAY);
}
bad:
printf("WARNING: CHECK AND RESET THE DATE!\n");
}
void
mkclock_isa_get(struct device *self, time_t base, struct clocktime *ct)
{
struct mkclock_isa_softc *sc = (struct mkclock_isa_softc *)self;
struct clock_ymdhms dt;
struct timeval tv;
todr_gettime(sc->sc_todr, &tv);
/* Note: we ignore `tv_usec'. */
clock_secs_to_ymdhms(tv.tv_sec, &dt);
ct->year = dt.dt_year - 1900;
ct->mon = dt.dt_mon;
ct->day = dt.dt_day;
ct->hour = dt.dt_hour;
ct->min = dt.dt_min;
ct->sec = dt.dt_sec;
ct->dow = dt.dt_wday;
}
/*
* Set up the system's time, given a `reasonable' time value.
*/
void
inittodr(time_t base)
{
bool badbase = false;
bool waszero = (base == 0);
bool goodtime = false;
bool badrtc = false;
int s;
struct timespec ts;
struct timeval tv;
rnd_add_data(NULL, &base, sizeof(base), 0);
if (base < 5 * SECS_PER_COMMON_YEAR) {
struct clock_ymdhms basedate;
/*
* If base is 0, assume filesystem time is just unknown
* instead of preposterous. Don't bark.
*/
if (base != 0)
printf("WARNING: preposterous time in file system\n");
/* not going to use it anyway, if the chip is readable */
basedate.dt_year = 2010;
basedate.dt_mon = 1;
basedate.dt_day = 1;
basedate.dt_hour = 12;
basedate.dt_min = 0;
basedate.dt_sec = 0;
base = clock_ymdhms_to_secs(&basedate);
badbase = true;
}
/*
* Some ports need to be supplied base in order to fabricate a time_t.
*/
if (todr_handle)
todr_handle->base_time = base;
if ((todr_handle == NULL) ||
(todr_gettime(todr_handle, &tv) != 0) ||
(tv.tv_sec < (25 * SECS_PER_COMMON_YEAR))) {
if (todr_handle != NULL)
printf("WARNING: preposterous TOD clock time\n");
else
printf("WARNING: no TOD clock present\n");
badrtc = true;
} else {
time_t deltat = tv.tv_sec - base;
if (deltat < 0)
deltat = -deltat;
if (!badbase && deltat >= 2 * SECS_PER_DAY) {
if (tv.tv_sec < base) {
/*
* The clock should never go backwards
* relative to filesystem time. If it
* does by more than the threshold,
* believe the filesystem.
*/
printf("WARNING: clock lost %" PRId64 " days\n",
deltat / SECS_PER_DAY);
badrtc = true;
} else {
aprint_verbose("WARNING: clock gained %" PRId64
" days\n", deltat / SECS_PER_DAY);
goodtime = true;
}
} else {
goodtime = true;
}
rnd_add_data(NULL, &tv, sizeof(tv), 0);
}
/* if the rtc time is bad, use the filesystem time */
if (badrtc) {
if (badbase) {
printf("WARNING: using default initial time\n");
} else {
printf("WARNING: using filesystem time\n");
}
tv.tv_sec = base;
tv.tv_usec = 0;
}
timeset = true;
ts.tv_sec = tv.tv_sec;
ts.tv_nsec = tv.tv_usec * 1000;
s = splclock();
tc_setclock(&ts);
splx(s);
if (waszero || goodtime)
return;
printf("WARNING: CHECK AND RESET THE DATE!\n");
}
