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ArmPkg: TimerDxe: Use 64bit operation for timer ticks

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The current implementation operates on 64bit value with implicit value
truncation.

This change updates the involved frequencies to use 64 bit based
operations.

Cc: Leif Lindholm <quic_llindhol@quicinc.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Sami Mujawar <sami.mujawar@arm.com>

Signed-off-by: Kun Qin <kun.qin@microsoft.com>
This commit is contained in:
Kun Qin 2024-10-10 15:21:36 -07:00 committed by mergify[bot]
parent 957fcbe7a3
commit 77d32b1796
1 changed files with 1 additions and 2 deletions
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ArmPkg/Drivers/TimerDxe/TimerDxe.c
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@ -143,8 +143,7 @@ TimerDriverSetTimerPeriod (
// mTimerTicks = TimerPeriod in 1ms unit x Frequency.10^-3
// = TimerPeriod.10^-4 x Frequency.10^-3
// = (TimerPeriod x Frequency) x 10^-7
TimerTicks = MultU64x32 (TimerPeriod, ArmGenericTimerGetTimerFreq ());
TimerTicks = DivU64x32 (TimerTicks, 10000000U);
TimerTicks = TimerPeriod * ArmGenericTimerGetTimerFreq () / 10000000U;
// Raise TPL to update the mTimerTicks and mTimerPeriod to ensure these values
// are coherent in the interrupt handler