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arm: switch real-time clocks to rtc_clock

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This lets the user specify the desired semantics.  By default, the RTC
will follow adjustments from the host's NTP client.  "-rtc clock=vm" will
improve determinism with both icount and qtest.  Finally, the previous
behavior is available with "-rtc clock=rt".

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Paolo Bonzini 2012-03-30 10:31:22 +00:00 • committed by Peter Maydell
parent e230d4e8bd
commit 348abc86c8
4 changed files with 25 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

10
hw/strongarm.c
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@ -255,7 +255,7 @@ static inline void strongarm_rtc_int_update(StrongARMRTCState *s)
static void strongarm_rtc_hzupdate(StrongARMRTCState *s)
{
int64_t rt = qemu_get_clock_ms(rt_clock);
int64_t rt = qemu_get_clock_ms(rtc_clock);
s->last_rcnr += ((rt - s->last_hz) << 15) /
(1000 * ((s->rttr & 0xffff) + 1));
s->last_hz = rt;
@ -308,7 +308,7 @@ static uint64_t strongarm_rtc_read(void *opaque, target_phys_addr_t addr,
return s->rtar;
case RCNR:
return s->last_rcnr +
((qemu_get_clock_ms(rt_clock) - s->last_hz) << 15) /
((qemu_get_clock_ms(rtc_clock) - s->last_hz) << 15) /
(1000 * ((s->rttr & 0xffff) + 1));
default:
printf("%s: Bad register 0x" TARGET_FMT_plx "\n", __func__, addr);
@ -374,10 +374,10 @@ static int strongarm_rtc_init(SysBusDevice *dev)
qemu_get_timedate(&tm, 0);
s->last_rcnr = (uint32_t) mktimegm(&tm);
s->last_hz = qemu_get_clock_ms(rt_clock);
s->last_hz = qemu_get_clock_ms(rtc_clock);
s->rtc_alarm = qemu_new_timer_ms(rt_clock, strongarm_rtc_alarm_tick, s);
s->rtc_hz = qemu_new_timer_ms(rt_clock, strongarm_rtc_hz_tick, s);
s->rtc_alarm = qemu_new_timer_ms(rtc_clock, strongarm_rtc_alarm_tick, s);
s->rtc_hz = qemu_new_timer_ms(rtc_clock, strongarm_rtc_hz_tick, s);
sysbus_init_irq(dev, &s->rtc_irq);
sysbus_init_irq(dev, &s->rtc_hz_irq);