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| author | Shumin Qiu <shumin.qiu@intel.com> | 2013-09-29 05:51:12 +0000 |
|---|---|---|
| committer | shenshushi <shenshushi@6f19259b-4bc3-4df7-8a09-765794883524> | 2013-09-29 05:51:12 +0000 |
| commit | 6a0d41c090d33387dac72d2b121d31a232960344 (patch) | |
| tree | 0a6a99b7b6dc4ced09a8a3384475f27ba93e097c /MdeModulePkg/Universal/TimestampDxe | |
| parent | 571c73b5a43c50218ffa3b927f6e3a6fb9ba5e68 (diff) | |
| download | edk2-platforms-6a0d41c090d33387dac72d2b121d31a232960344.tar.xz | |
Add the definition for Timestamp Protocol and a new driver base on TimerLib to produce Timestamp protocol.
Signed-off-by: Shumin Qiu <shumin.qiu@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14739 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg/Universal/TimestampDxe')
| -rw-r--r-- | MdeModulePkg/Universal/TimestampDxe/TimestampDxe.c | 166 | ||||
| -rw-r--r-- | MdeModulePkg/Universal/TimestampDxe/TimestampDxe.inf | 49 |
2 files changed, 215 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/TimestampDxe/TimestampDxe.c b/MdeModulePkg/Universal/TimestampDxe/TimestampDxe.c new file mode 100644 index 0000000000..30349b5ec5 --- /dev/null +++ b/MdeModulePkg/Universal/TimestampDxe/TimestampDxe.c @@ -0,0 +1,166 @@ +/** @file
+ Implementation of Timestamp Protocol using UEFI APIs.
+
+Copyright (c) 2013, Intel Corporation. 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 <Uefi.h>
+#include <Library/DebugLib.h>
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/TimerLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Protocol/Timestamp.h>
+
+//
+// The StartValue in TimerLib
+//
+UINT64 mTimerLibStartValue = 0;
+
+//
+// The EndValue in TimerLib
+//
+UINT64 mTimerLibEndValue = 0;
+
+//
+// The properties of timestamp
+//
+EFI_TIMESTAMP_PROPERTIES mTimestampProperties = {
+ 0,
+ 0
+};
+
+/**
+ Retrieves the current value of a 64-bit free running timestamp counter.
+
+ The counter shall count up in proportion to the amount of time that has passed. The counter value
+ will always roll over to zero. The properties of the counter can be retrieved from GetProperties().
+ The caller should be prepared for the function to return the same value twice across successive calls.
+ The counter value will not go backwards other than when wrapping, as defined by EndValue in GetProperties().
+ The frequency of the returned timestamp counter value must remain constant. Power management operations that
+ affect clocking must not change the returned counter frequency. The quantization of counter value updates may
+ vary as long as the value reflecting time passed remains consistent.
+
+ @retval The current value of the free running timestamp counter.
+
+**/
+UINT64
+EFIAPI
+TimestampDriverGetTimestamp (
+ VOID
+ )
+{
+ //
+ // The timestamp of Timestamp Protocol
+ //
+ UINT64 TimestampValue;
+ TimestampValue = 0;
+
+ //
+ // Get the timestamp
+ //
+ if (mTimerLibStartValue > mTimerLibEndValue) {
+ TimestampValue = mTimerLibStartValue - GetPerformanceCounter();
+ } else {
+ TimestampValue = GetPerformanceCounter() - mTimerLibStartValue;
+ }
+
+ return TimestampValue;
+}
+
+/**
+ Obtains timestamp counter properties including frequency and value limits.
+
+ @param[out] Properties The properties of the timestamp counter.
+
+ @retval EFI_SUCCESS The properties were successfully retrieved.
+ @retval EFI_DEVICE_ERROR An error occurred trying to retrieve the properties of the timestamp
+ counter subsystem. Properties is not pedated.
+ @retval EFI_INVALID_PARAMETER Properties is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+TimestampDriverGetProperties(
+ OUT EFI_TIMESTAMP_PROPERTIES *Properties
+ )
+{
+ if (Properties == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // Get timestamp properties
+ //
+ CopyMem((VOID *) Properties, (VOID *) &mTimestampProperties, sizeof (mTimestampProperties));
+
+ return EFI_SUCCESS;
+}
+
+//
+// The Timestamp Protocol instance produced by this driver
+//
+EFI_TIMESTAMP_PROTOCOL mTimestamp = {
+ TimestampDriverGetTimestamp,
+ TimestampDriverGetProperties
+};
+
+/**
+ Entry point of the Timestamp Protocol driver.
+
+ @param ImageHandle The image handle of this driver.
+ @param SystemTable The pointer of EFI_SYSTEM_TABLE.
+
+ @retval EFI_SUCCESS Watchdog Timer Architectural Protocol successfully installed.
+
+**/
+EFI_STATUS
+EFIAPI
+TimestampDriverInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+
+ EFI_HANDLE TimestampHandle;
+ TimestampHandle = NULL;
+
+ //
+ // Get the start value, end value and frequency in Timerlib
+ //
+ mTimestampProperties.Frequency = GetPerformanceCounterProperties(&mTimerLibStartValue, &mTimerLibEndValue);
+
+ //
+ // Set the EndValue
+ //
+ if (mTimerLibEndValue > mTimerLibStartValue) {
+ mTimestampProperties.EndValue = mTimerLibEndValue - mTimerLibStartValue;
+ } else {
+ mTimestampProperties.EndValue = mTimerLibStartValue - mTimerLibEndValue;
+ }
+
+ DEBUG ((EFI_D_INFO, "TimerFrequency:0x%lx, TimerLibStartTime:0x%lx, TimerLibEndtime:0x%lx\n", mTimestampProperties.Frequency, mTimerLibStartValue, mTimerLibEndValue));
+
+ //
+ // Install the Timestamp Protocol onto a new handle
+ //
+ Status = gBS->InstallMultipleProtocolInterfaces (
+ &TimestampHandle,
+ &gEfiTimestampProtocolGuid,
+ &mTimestamp,
+ NULL
+ );
+
+ ASSERT_EFI_ERROR (Status);
+
+ return EFI_SUCCESS;
+}
diff --git a/MdeModulePkg/Universal/TimestampDxe/TimestampDxe.inf b/MdeModulePkg/Universal/TimestampDxe/TimestampDxe.inf new file mode 100644 index 0000000000..95b0a08384 --- /dev/null +++ b/MdeModulePkg/Universal/TimestampDxe/TimestampDxe.inf @@ -0,0 +1,49 @@ +## @file
+# Generic Timestamp driver produceing Timestamp Protocol using UEFI APIs.
+#
+# Copyright (c) 2013, Intel Corporation. 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.
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = TimestampDxe
+ FILE_GUID = C10194E7-DEB2-4AF4-9EEE-BFFDE4D7D4C7
+ MODULE_TYPE = DXE_DRIVER
+ VERSION_STRING = 1.0
+ ENTRY_POINT = TimestampDriverInitialize
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = IA32 X64 IPF EBC
+#
+
+[Packages]
+ MdePkg/MdePkg.dec
+
+[Sources]
+ TimestampDxe.c
+
+[LibraryClasses]
+ UefiBootServicesTableLib
+ UefiDriverEntryPoint
+ TimerLib
+ BaseMemoryLib
+ DebugLib
+
+[Protocols]
+ gEfiTimestampProtocolGuid ## PRODUCES
+
+[depex]
+ TRUE
+
+
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