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/** @file
Copyright (c) 2008 - 2010, Apple Inc. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Base.h>
#include <Library/BaseLib.h>
#include <Library/TimerLib.h>
#include <Library/DebugLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
UINTN
EFIAPI
MicroSecondDelay (
IN UINTN MicroSeconds
)
{
UINT64 NanoSeconds;
NanoSeconds = MultU64x32 (MicroSeconds, 1000);
while (NanoSeconds > (UINTN)-1) {
NanoSecondDelay((UINTN)-1);
NanoSeconds -= (UINTN)-1;
}
NanoSecondDelay (NanoSeconds);
return MicroSeconds;
}
UINTN
EFIAPI
NanoSecondDelay (
IN UINTN NanoSeconds
)
{
UINT32 Delay;
UINT32 StartTime;
UINT32 CurrentTime;
UINT32 ElapsedTime;
Delay = (NanoSeconds / PcdGet32(PcdEmbeddedPerformanceCounterPeriodInNanoseconds)) + 1;
StartTime = MmioRead32 (0);
do
{
CurrentTime = 0ULL;
ElapsedTime = CurrentTime - StartTime;
} while (ElapsedTime < Delay);
NanoSeconds = ElapsedTime * PcdGet32 (PcdEmbeddedPerformanceCounterPeriodInNanoseconds);
return NanoSeconds;
}
UINT64
EFIAPI
GetPerformanceCounter (
VOID
)
{
return (UINT64)0ULL;
}
UINT64
EFIAPI
GetPerformanceCounterProperties (
OUT UINT64 *StartValue, OPTIONAL
OUT UINT64 *EndValue OPTIONAL
)
{
if (StartValue != NULL) {
// Timer starts with the reload value
*StartValue = (UINT64)0ULL;
}
if (EndValue != NULL) {
// Timer counts up to 0xFFFFFFFF
*EndValue = 0xFFFFFFFF;
}
return PcdGet64(PcdEmbeddedPerformanceCounterFrequencyInHz);
}
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