diff options
| author | Xiao Guangrong <xiaoguangrong@tencent.com> | 2017-05-27 10:53:01 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2017-06-06 20:18:35 +0200 |
| commit | bd618eab7641693f0838da52c5af5c8050f831d3 (patch) | |
| tree | 67073e289005de2a59b5c1f722a981b0c9aacb0e /hw/timer | |
| parent | e0c8b950d17a57343926ed937af10e8903b0d6cc (diff) | |
| download | qemu-bd618eab7641693f0838da52c5af5c8050f831d3.tar.gz | |
qtest: add rtc periodic timer test
It tests the accuracy of rtc periodic timer which is recently
improved & fixed by commit 7ffcb539a3 ("mc146818rtc: precisely count
the clock for periodic timer", 2017-05-19).
Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>
Message-Id: <20170527025301.23499-1-xiaoguangrong@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/timer')
| -rw-r--r-- | hw/timer/mc146818rtc.c | 15 |
1 files changed, 3 insertions, 12 deletions
diff --git a/hw/timer/mc146818rtc.c b/hw/timer/mc146818rtc.c index 542cd09bc1..1b8d3d7d4c 100644 --- a/hw/timer/mc146818rtc.c +++ b/hw/timer/mc146818rtc.c @@ -120,7 +120,7 @@ static void rtc_coalesced_timer_update(RTCState *s) /* divide each RTC interval to 2 - 8 smaller intervals */ int c = MIN(s->irq_coalesced, 7) + 1; int64_t next_clock = qemu_clock_get_ns(rtc_clock) + - muldiv64(s->period / c, NANOSECONDS_PER_SECOND, RTC_CLOCK_RATE); + periodic_clock_to_ns(s->period / c); timer_mod(s->coalesced_timer, next_clock); } } @@ -178,16 +178,8 @@ static uint32_t rtc_periodic_clock_ticks(RTCState *s) } period_code = s->cmos_data[RTC_REG_A] & 0x0f; - if (!period_code) { - return 0; - } - - if (period_code <= 2) { - period_code += 7; - } - /* period in 32 Khz cycles */ - return 1 << (period_code - 1); + return periodic_period_to_clock(period_code); } /* @@ -260,8 +252,7 @@ periodic_timer_update(RTCState *s, int64_t current_time, uint32_t old_period) assert(lost_clock >= 0 && lost_clock <= period); next_irq_clock = cur_clock + period - lost_clock; - s->next_periodic_time = muldiv64(next_irq_clock, NANOSECONDS_PER_SECOND, - RTC_CLOCK_RATE) + 1; + s->next_periodic_time = periodic_clock_to_ns(next_irq_clock) + 1; timer_mod(s->periodic_timer, s->next_periodic_time); } else { s->irq_coalesced = 0; |