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- /** @file
- A non-functional instance of the Timer Library.
- Copyright (c) 2007 - 2019, Intel Corporation. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include <PiPei.h>
- #include <Library/BaseLib.h>
- #include <Library/TimerLib.h>
- #include <Library/DebugLib.h>
- #include <Library/EmuThunkLib.h>
- #include <Library/UefiBootServicesTableLib.h>
- #include <Library/UefiLib.h>
- #include <Protocol/Timer.h>
- STATIC UINT64 gTimerPeriod = 0;
- STATIC EFI_TIMER_ARCH_PROTOCOL *gTimerAp = NULL;
- STATIC EFI_EVENT gTimerEvent = NULL;
- STATIC VOID *gRegistration = NULL;
- VOID
- EFIAPI
- RegisterTimerArchProtocol (
- IN EFI_EVENT Event,
- IN VOID *Context
- )
- {
- EFI_STATUS Status;
- Status = gBS->LocateProtocol (&gEfiTimerArchProtocolGuid, NULL, (VOID **)&gTimerAp);
- if (!EFI_ERROR (Status)) {
- Status = gTimerAp->GetTimerPeriod (gTimerAp, &gTimerPeriod);
- ASSERT_EFI_ERROR (Status);
- // Convert to Nanoseconds.
- gTimerPeriod = MultU64x32 (gTimerPeriod, 100);
- if (gTimerEvent == NULL) {
- Status = gBS->CreateEvent (EVT_TIMER, 0, NULL, NULL, &gTimerEvent);
- ASSERT_EFI_ERROR (Status);
- }
- }
- }
- /**
- Stalls the CPU for at least the given number of microseconds.
- Stalls the CPU for the number of microseconds specified by MicroSeconds.
- @param MicroSeconds The minimum number of microseconds to delay.
- @return The value of MicroSeconds inputted.
- **/
- UINTN
- EFIAPI
- MicroSecondDelay (
- IN UINTN MicroSeconds
- )
- {
- return NanoSecondDelay (MicroSeconds * 1000);
- }
- /**
- Stalls the CPU for at least the given number of nanoseconds.
- Stalls the CPU for the number of nanoseconds specified by NanoSeconds.
- @param NanoSeconds The minimum number of nanoseconds to delay.
- @return The value of NanoSeconds inputted.
- **/
- UINTN
- EFIAPI
- NanoSecondDelay (
- IN UINTN NanoSeconds
- )
- {
- EFI_STATUS Status;
- UINT64 HundredNanoseconds;
- UINTN Index;
- if ((gTimerPeriod != 0) &&
- ((UINT64)NanoSeconds > gTimerPeriod) &&
- (EfiGetCurrentTpl () == TPL_APPLICATION))
- {
- //
- // This stall is long, so use gBS->WaitForEvent () to yield CPU to DXE Core
- //
- HundredNanoseconds = DivU64x32 (NanoSeconds, 100);
- Status = gBS->SetTimer (gTimerEvent, TimerRelative, HundredNanoseconds);
- ASSERT_EFI_ERROR (Status);
- Status = gBS->WaitForEvent (sizeof (gTimerEvent)/sizeof (EFI_EVENT), &gTimerEvent, &Index);
- ASSERT_EFI_ERROR (Status);
- } else {
- gEmuThunk->Sleep (NanoSeconds);
- }
- return NanoSeconds;
- }
- /**
- Retrieves the current value of a 64-bit free running performance counter.
- The counter can either count up by 1 or count down by 1. If the physical
- performance counter counts by a larger increment, then the counter values
- must be translated. The properties of the counter can be retrieved from
- GetPerformanceCounterProperties().
- @return The current value of the free running performance counter.
- **/
- UINT64
- EFIAPI
- GetPerformanceCounter (
- VOID
- )
- {
- return gEmuThunk->QueryPerformanceCounter ();
- }
- /**
- Retrieves the 64-bit frequency in Hz and the range of performance counter
- values.
- If StartValue is not NULL, then the value that the performance counter starts
- with immediately after is it rolls over is returned in StartValue. If
- EndValue is not NULL, then the value that the performance counter end with
- immediately before it rolls over is returned in EndValue. The 64-bit
- frequency of the performance counter in Hz is always returned. If StartValue
- is less than EndValue, then the performance counter counts up. If StartValue
- is greater than EndValue, then the performance counter counts down. For
- example, a 64-bit free running counter that counts up would have a StartValue
- of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter
- that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.
- @param StartValue The value the performance counter starts with when it
- rolls over.
- @param EndValue The value that the performance counter ends with before
- it rolls over.
- @return The frequency in Hz.
- **/
- UINT64
- EFIAPI
- GetPerformanceCounterProperties (
- OUT UINT64 *StartValue OPTIONAL,
- OUT UINT64 *EndValue OPTIONAL
- )
- {
- if (StartValue != NULL) {
- *StartValue = 0ULL;
- }
- if (EndValue != NULL) {
- *EndValue = (UINT64)-1LL;
- }
- return gEmuThunk->QueryPerformanceFrequency ();
- }
- /**
- Register for the Timer AP protocol.
- @param ImageHandle The firmware allocated handle for the EFI image.
- @param SystemTable A pointer to the EFI System Table.
- @retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
- **/
- EFI_STATUS
- EFIAPI
- DxeTimerLibConstructor (
- IN EFI_HANDLE ImageHandle,
- IN EFI_SYSTEM_TABLE *SystemTable
- )
- {
- EfiCreateProtocolNotifyEvent (
- &gEfiTimerArchProtocolGuid,
- TPL_CALLBACK,
- RegisterTimerArchProtocol,
- NULL,
- &gRegistration
- );
- return EFI_SUCCESS;
- }
- /**
- 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 Frequency;
- UINT64 NanoSeconds;
- UINT64 Remainder;
- INTN Shift;
- Frequency = GetPerformanceCounterProperties (NULL, NULL);
- //
- // Ticks
- // Time = --------- x 1,000,000,000
- // Frequency
- //
- NanoSeconds = MultU64x32 (DivU64x64Remainder (Ticks, Frequency, &Remainder), 1000000000u);
- //
- // Ensure (Remainder * 1,000,000,000) will not overflow 64-bit.
- // Since 2^29 < 1,000,000,000 = 0x3B9ACA00 < 2^30, Remainder should < 2^(64-30) = 2^34,
- // i.e. highest bit set in Remainder should <= 33.
- //
- Shift = MAX (0, HighBitSet64 (Remainder) - 33);
- Remainder = RShiftU64 (Remainder, (UINTN)Shift);
- Frequency = RShiftU64 (Frequency, (UINTN)Shift);
- NanoSeconds += DivU64x64Remainder (MultU64x32 (Remainder, 1000000000u), Frequency, NULL);
- return NanoSeconds;
- }
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