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ArmPkg/ArmArchTimerLib: add GetTimeInNanoSecond() to ArmArchTimerLib

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FirmwarePerformanceDxe.c utilizes the Timer Library function
GetTimeInNanoSecond() which was not implemented by the ArmArchTimerLib.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Evan Lloyd <evan.lloyd@arm.com>
Reviewed-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-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 cbdece1769
commit 96a80ae3ce
1 changed files with 50 additions and 1 deletions
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51
ArmPkg/Library/ArmArchTimerLib/ArmArchTimerLib.c
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@ -1,7 +1,7 @@
/** @file
Generic ARM implementation of TimerLib.h
Copyright (c) 2011-2014, ARM Limited. All rights reserved.
Copyright (c) 2011-2016, ARM Limited. All rights reserved.
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
@ -242,3 +242,52 @@ GetPerformanceCounterProperties (
return (UINT64)ArmGenericTimerGetTimerFreq ();
}
/**
Converts elapsed ticks of performance counter to time in nanoseconds.
This function converts the elapsed ticks of running performance counter to
time value in unit of nanoseconds.
@param Ticks The number of elapsed ticks of running performance counter.
@return The elapsed time in nanoseconds.
**/
UINT64
EFIAPI
GetTimeInNanoSecond (
IN UINT64 Ticks
)
{
UINT64 NanoSeconds;
UINT32 Remainder;
UINT32 TimerFreq;
TimerFreq = GetPlatformTimerFreq ();
//
// Ticks
// Time = --------- x 1,000,000,000
// Frequency
//
NanoSeconds = MultU64xN (
DivU64x32Remainder (
Ticks,
TimerFreq,
&Remainder),
1000000000U
);
//
// Frequency < 0x100000000, so Remainder < 0x100000000, then (Remainder * 1,000,000,000)
// will not overflow 64-bit.
//
NanoSeconds += DivU64x32 (
MultU64xN (
(UINT64) Remainder,
1000000000U),
TimerFreq
);
return NanoSeconds;
}