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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 /** @file
Generic ARM implementation of TimerLib.h 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 This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License are licensed and made available under the terms and conditions of the BSD License
@ -242,3 +242,52 @@ GetPerformanceCounterProperties (
return (UINT64)ArmGenericTimerGetTimerFreq (); 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;
}