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ArmPkg/ArchArmTimerLib: refactor MultU64xN and TimerFreq definitions 

This refactors some timer code to define MultU64xN as a preprocessor
symbol rather than a function pointer, and to factor out the code that
obtains the timer frequency into GetPlatformTimerFreq ().

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
Reviewed-by: Ryan Harkin <ryan.harkin@linaro.org>

Contributed-under: TianoCore Contribution Agreement 1.0
[ard.biesheuvel: split off from 'add GetTimeInNanoSecond() to ArmArchTimerLib']
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
This commit is contained in:
Sami Mujawar 2016-03-03 15:28:16 +00:00 committed by Ard Biesheuvel
parent 37b680116d
commit cbdece1769
1 changed files with 31 additions and 18 deletions
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49
ArmPkg/Library/ArmArchTimerLib/ArmArchTimerLib.c
View File

@ -24,6 +24,14 @@
#define TICKS_PER_MICRO_SEC (PcdGet32 (PcdArmArchTimerFreqInHz)/1000000U)
// Select appropriate multiply function for platform architecture.
#ifdef MDE_CPU_ARM
#define MultU64xN MultU64x32
#else
#define MultU64xN MultU64x64
#endif
RETURN_STATUS
EFIAPI
TimerConstructor (
@ -76,6 +84,28 @@ TimerConstructor (
return RETURN_SUCCESS;
}
/**
A local utility function that returns the PCD value, if specified.
Otherwise it defaults to ArmGenericTimerGetTimerFreq.
@return The timer frequency.
**/
STATIC
UINTN
EFIAPI
GetPlatformTimerFreq (
)
{
UINTN TimerFreq;
TimerFreq = PcdGet32 (PcdArmArchTimerFreqInHz);
if (TimerFreq == 0) {
TimerFreq = ArmGenericTimerGetTimerFreq ();
}
return TimerFreq;
}
/**
Stalls the CPU for the number of microseconds specified by MicroSeconds.
@ -93,23 +123,6 @@ MicroSecondDelay (
{
UINT64 TimerTicks64;
UINT64 SystemCounterVal;
UINT64 (EFIAPI
*MultU64xN) (
IN UINT64 Multiplicand,
IN UINTN Multiplier
);
UINTN TimerFreq;
#ifdef MDE_CPU_ARM
MultU64xN = MultU64x32;
#else
MultU64xN = MultU64x64;
#endif
TimerFreq = PcdGet32 (PcdArmArchTimerFreqInHz);
if (TimerFreq == 0) {
TimerFreq = ArmGenericTimerGetTimerFreq ();
}
// Calculate counter ticks that can represent requested delay:
// = MicroSeconds x TICKS_PER_MICRO_SEC
@ -117,7 +130,7 @@ MicroSecondDelay (
TimerTicks64 = DivU64x32 (
MultU64xN (
MicroSeconds,
TimerFreq
GetPlatformTimerFreq ()
),
1000000U
);