mirror of https://github.com/acidanthera/audk.git
161 lines
4.4 KiB
C
161 lines
4.4 KiB
C
/** @file
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Implementation of Timestamp Protocol using UEFI APIs.
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Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Uefi.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiDriverEntryPoint.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/TimerLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Protocol/Timestamp.h>
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//
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// The StartValue in TimerLib
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//
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UINT64 mTimerLibStartValue = 0;
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//
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// The EndValue in TimerLib
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//
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UINT64 mTimerLibEndValue = 0;
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//
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// The properties of timestamp
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//
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EFI_TIMESTAMP_PROPERTIES mTimestampProperties = {
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0,
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0
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};
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/**
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Retrieves the current value of a 64-bit free running timestamp counter.
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The counter shall count up in proportion to the amount of time that has passed. The counter value
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will always roll over to zero. The properties of the counter can be retrieved from GetProperties().
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The caller should be prepared for the function to return the same value twice across successive calls.
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The counter value will not go backwards other than when wrapping, as defined by EndValue in GetProperties().
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The frequency of the returned timestamp counter value must remain constant. Power management operations that
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affect clocking must not change the returned counter frequency. The quantization of counter value updates may
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vary as long as the value reflecting time passed remains consistent.
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@retval The current value of the free running timestamp counter.
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**/
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UINT64
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EFIAPI
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TimestampDriverGetTimestamp (
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VOID
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)
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{
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//
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// The timestamp of Timestamp Protocol
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//
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UINT64 TimestampValue;
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TimestampValue = 0;
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//
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// Get the timestamp
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//
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if (mTimerLibStartValue > mTimerLibEndValue) {
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TimestampValue = mTimerLibStartValue - GetPerformanceCounter();
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} else {
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TimestampValue = GetPerformanceCounter() - mTimerLibStartValue;
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}
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return TimestampValue;
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}
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/**
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Obtains timestamp counter properties including frequency and value limits.
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@param[out] Properties The properties of the timestamp counter.
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@retval EFI_SUCCESS The properties were successfully retrieved.
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@retval EFI_DEVICE_ERROR An error occurred trying to retrieve the properties of the timestamp
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counter subsystem. Properties is not pedated.
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@retval EFI_INVALID_PARAMETER Properties is NULL.
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**/
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EFI_STATUS
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EFIAPI
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TimestampDriverGetProperties(
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OUT EFI_TIMESTAMP_PROPERTIES *Properties
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)
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{
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if (Properties == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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//
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// Get timestamp properties
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//
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CopyMem((VOID *) Properties, (VOID *) &mTimestampProperties, sizeof (mTimestampProperties));
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return EFI_SUCCESS;
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}
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//
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// The Timestamp Protocol instance produced by this driver
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//
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EFI_TIMESTAMP_PROTOCOL mTimestamp = {
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TimestampDriverGetTimestamp,
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TimestampDriverGetProperties
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};
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/**
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Entry point of the Timestamp Protocol driver.
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@param ImageHandle The image handle of this driver.
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@param SystemTable The pointer of EFI_SYSTEM_TABLE.
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@retval EFI_SUCCESS Watchdog Timer Architectural Protocol successfully installed.
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**/
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EFI_STATUS
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EFIAPI
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TimestampDriverInitialize (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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EFI_HANDLE TimestampHandle;
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TimestampHandle = NULL;
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//
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// Get the start value, end value and frequency in Timerlib
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//
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mTimestampProperties.Frequency = GetPerformanceCounterProperties(&mTimerLibStartValue, &mTimerLibEndValue);
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//
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// Set the EndValue
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//
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if (mTimerLibEndValue > mTimerLibStartValue) {
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mTimestampProperties.EndValue = mTimerLibEndValue - mTimerLibStartValue;
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} else {
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mTimestampProperties.EndValue = mTimerLibStartValue - mTimerLibEndValue;
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}
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DEBUG ((EFI_D_INFO, "TimerFrequency:0x%lx, TimerLibStartTime:0x%lx, TimerLibEndtime:0x%lx\n", mTimestampProperties.Frequency, mTimerLibStartValue, mTimerLibEndValue));
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//
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// Install the Timestamp Protocol onto a new handle
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//
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Status = gBS->InstallMultipleProtocolInterfaces (
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&TimestampHandle,
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&gEfiTimestampProtocolGuid,
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&mTimestamp,
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NULL
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);
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ASSERT_EFI_ERROR (Status);
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return EFI_SUCCESS;
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}
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