void clockobj_caltime_to_ticks(struct clockobj *clkobj, const struct tm *tm,
unsigned long rticks, ticks_t *pticks)
{
ticks_t t = 0;
int n; /* Must be signed. */
/*
* We expect tick counts to be based on the time(2) epoch,
* i.e. 00:00:00 UTC, January 1, 1970.
*/
for (n = 1970; n < 1900 + tm->tm_year; n++)
t += ((n % 4) ? 365 : 366);
if (!(tm->tm_year % 4) && tm->tm_mon >= 2)
/* Add one day for leap year after February. */
t++;
for (n = tm->tm_mon - 1; n >= 0; n--)
t += mdays[n];
t += tm->tm_mday - 1;
t *= 24;
t += tm->tm_hour;
t *= 60;
t += tm->tm_min;
t *= 60;
t += tm->tm_sec;
t *= clockobj_get_frequency(clkobj);
t += rticks;
/* XXX: we currently don't care about DST. */
*pticks = t;
}
static int date_to_tmstruct(u_long date, u_long time, u_long ticks,
struct tm *tm)
{
if (ticks > clockobj_get_frequency(&psos_clock))
return ERR_ILLTICKS;
memset(tm, 0, sizeof(*tm));
tm->tm_sec = time & 0xff;
tm->tm_min = (time >> 8) & 0xff;
tm->tm_hour = time >> 16;
if (tm->tm_sec > 59 || tm->tm_min > 59 || tm->tm_hour > 23)
return ERR_ILLTIME;
/*
* XXX: we want the calendar time to use the time(2) epoch,
* i.e. 00:00:00 UTC, January 1, 1970.
*/
tm->tm_mday = date & 0xff;
tm->tm_mon = ((date >> 8) & 0xff) - 1;
tm->tm_year = (date >> 16) - 1900;
if (tm->tm_mday < 1 || tm->tm_mday > 31 ||
tm->tm_mon > 11 || tm->tm_year < 70)
return ERR_ILLDATE;
return SUCCESS;
}
void __clockobj_ticks_to_timespec(struct clockobj *clkobj,
ticks_t ticks,
struct timespec *ts)
{
unsigned int freq;
if (clockobj_get_resolution(clkobj) > 1) {
freq = clockobj_get_frequency(clkobj);
ts->tv_sec = ticks / freq;
ts->tv_nsec = ticks - (ts->tv_sec * freq);
ts->tv_nsec *= clockobj_get_resolution(clkobj);
} else
clockobj_ns_to_timespec(ticks, ts);
}
void clockobj_get_date(struct clockobj *clkobj, ticks_t *pticks)
{
struct timespec now, date;
read_lock_nocancel(&clkobj->lock);
__RT(clock_gettime(CLOCK_COPPERPLATE, &now));
/* Add offset from epoch to current system time. */
timespec_add(&date, &clkobj->offset, &now);
/* Convert the time value to ticks,. */
*pticks = (ticks_t)date.tv_sec * clockobj_get_frequency(clkobj)
+ (ticks_t)date.tv_nsec / clockobj_get_resolution(clkobj);
read_unlock(&clkobj->lock);
}
void clockobj_ticks_to_caltime(struct clockobj *clkobj,
ticks_t ticks,
struct tm *tm,
unsigned long *rticks)
{
unsigned long year, month, day, hour, min, sec;
unsigned int freq;
time_t nsecs;
freq = clockobj_get_frequency(clkobj);
nsecs = ticks / freq;
*rticks = ticks % freq;
for (year = 1970;; year++) { /* Years since 1970. */
int ysecs = ((year % 4) ? 365 : 366) * SECBYDAY;
if (ysecs > nsecs)
break;
nsecs -= ysecs;
}
for (month = 0;; month++) {
int secbymon = mdays[month] * SECBYDAY;
if (month == 1 && (year % 4) == 0)
/* Account for leap year on February. */
secbymon += SECBYDAY;
if (secbymon > nsecs)
break;
nsecs -= secbymon;
}
day = nsecs / SECBYDAY;
nsecs -= (day * SECBYDAY);
hour = (nsecs / SECBYHOUR);
nsecs -= (hour * SECBYHOUR);
min = (nsecs / SECBYMIN);
nsecs -= (min * SECBYMIN);
sec = nsecs;
memset(tm, 0, sizeof(*tm));
tm->tm_year = year - 1900;
tm->tm_mon = month;
tm->tm_mday = day + 1;
tm->tm_hour = hour;
tm->tm_min = min;
tm->tm_sec = sec;
}
void clockobj_get_time(struct clockobj *clkobj, ticks_t *pticks,
ticks_t *ptsc)
{
struct timespec now;
__RT(clock_gettime(CLOCK_COPPERPLATE, &now));
/* Convert the time value to ticks, with no offset. */
if (clockobj_get_resolution(clkobj) > 1)
*pticks = (ticks_t)now.tv_sec * clockobj_get_frequency(clkobj)
+ (ticks_t)now.tv_nsec / clockobj_get_resolution(clkobj);
else
*pticks = timespec_scalar(&now);
/*
* Mercury has a single time source, with TSC == monotonic
* time.
*/
if (ptsc)
*ptsc = *pticks;
}
