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mc146818rtc: Handle host clock resets 

Make use of the new clock reset notifier to update the RTC whenever
rtc_clock is the host clock and that happens to jump backward. This
avoids that the RTC stalls for the period the host clock was set back.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2011-06-20 14:06:28 +02:00 committed by Anthony Liguori
parent 691a0c9c9b
commit 17604dac28
1 changed files with 20 additions and 0 deletions
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20
hw/mc146818rtc.c
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@ -99,6 +99,7 @@ typedef struct RTCState {
QEMUTimer *coalesced_timer;
QEMUTimer *second_timer;
QEMUTimer *second_timer2;
Notifier clock_reset_notifier;
} RTCState;
static void rtc_set_time(RTCState *s);
@ -572,6 +573,22 @@ static const VMStateDescription vmstate_rtc = {
}
};
static void rtc_notify_clock_reset(Notifier *notifier, void *data)
{
RTCState *s = container_of(notifier, RTCState, clock_reset_notifier);
int64_t now = *(int64_t *)data;
rtc_set_date_from_host(&s->dev);
s->next_second_time = now + (get_ticks_per_sec() * 99) / 100;
qemu_mod_timer(s->second_timer2, s->next_second_time);
rtc_timer_update(s, now);
#ifdef TARGET_I386
if (rtc_td_hack) {
rtc_coalesced_timer_update(s);
}
#endif
}
static void rtc_reset(void *opaque)
{
RTCState *s = opaque;
@ -608,6 +625,9 @@ static int rtc_initfn(ISADevice *dev)
s->second_timer = qemu_new_timer_ns(rtc_clock, rtc_update_second, s);
s->second_timer2 = qemu_new_timer_ns(rtc_clock, rtc_update_second2, s);
s->clock_reset_notifier.notify = rtc_notify_clock_reset;
qemu_register_clock_reset_notifier(rtc_clock, &s->clock_reset_notifier);
s->next_second_time =
qemu_get_clock_ns(rtc_clock) + (get_ticks_per_sec() * 99) / 100;
qemu_mod_timer(s->second_timer2, s->next_second_time);