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 /include | |
| parent | e0c8b950d17a57343926ed937af10e8903b0d6cc (diff) | |
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 'include')
| -rw-r--r-- | include/hw/timer/mc146818rtc_regs.h | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/include/hw/timer/mc146818rtc_regs.h b/include/hw/timer/mc146818rtc_regs.h index 6ede6c832e..c62f17bf2d 100644 --- a/include/hw/timer/mc146818rtc_regs.h +++ b/include/hw/timer/mc146818rtc_regs.h @@ -65,4 +65,24 @@ #define REG_C_AF 0x20 #define REG_C_MASK 0x70 +static inline uint32_t periodic_period_to_clock(int period_code) +{ + if (!period_code) { + return 0; + } + + if (period_code <= 2) { + period_code += 7; + } + /* period in 32 Khz cycles */ + return 1 << (period_code - 1); +} + +#define RTC_CLOCK_RATE 32768 + +static inline int64_t periodic_clock_to_ns(int64_t clocks) +{ + return muldiv64(clocks, NANOSECONDS_PER_SECOND, RTC_CLOCK_RATE); +} + #endif |