MdeModulePkg/Include/Guid/Performance.h - third_party/edk2 - Git at Google

 /** @file
   This file defines performance-related definitions, including the format of:
   * performance GUID HOB.
   * performance protocol interfaces.
   * performance variables.

 Copyright (c) 2009 - 2018, 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 that 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.

 **/

 #ifndef __PERFORMANCE_DATA_H__
 #define __PERFORMANCE_DATA_H__

 #define PERFORMANCE_PROPERTY_REVISION 0x1

 typedef struct {
   UINT32                Revision;
   UINT32                Reserved;
   UINT64                Frequency;
   UINT64                TimerStartValue;
   UINT64                TimerEndValue;
 } PERFORMANCE_PROPERTY;

 //
 // PEI_PERFORMANCE_STRING_SIZE must be a multiple of 8.
 //
 #define PEI_PERFORMANCE_STRING_SIZE     8
 #define PEI_PERFORMANCE_STRING_LENGTH   (PEI_PERFORMANCE_STRING_SIZE - 1)

 typedef struct {
   EFI_PHYSICAL_ADDRESS  Handle;
   CHAR8                 Token[PEI_PERFORMANCE_STRING_SIZE];   ///< Measured token string name.
   CHAR8                 Module[PEI_PERFORMANCE_STRING_SIZE];  ///< Module string name.
   UINT64                StartTimeStamp;                       ///< Start time point.
   UINT64                EndTimeStamp;                         ///< End time point.
 } PEI_PERFORMANCE_LOG_ENTRY;

 //
 // The header must be aligned at 8 bytes.
 //
 typedef struct {
   UINT32                NumberOfEntries;  ///< The number of all performance log entries.
   UINT32                Reserved;
 } PEI_PERFORMANCE_LOG_HEADER;


 #define PERFORMANCE_PROTOCOL_GUID \
   { 0x76b6bdfa, 0x2acd, 0x4462, { 0x9E, 0x3F, 0xcb, 0x58, 0xC9, 0x69, 0xd9, 0x37 } }

 #define PERFORMANCE_EX_PROTOCOL_GUID \
   { 0x1ea81bec, 0xf01a, 0x4d98, { 0xa2, 0x1,  0x4a, 0x61, 0xce, 0x2f, 0xc0, 0x22 } }

 //
 // Forward reference for pure ANSI compatibility
 //
 typedef struct _PERFORMANCE_PROTOCOL PERFORMANCE_PROTOCOL;
 typedef struct _PERFORMANCE_EX_PROTOCOL PERFORMANCE_EX_PROTOCOL;

 //
 // DXE_PERFORMANCE_STRING_SIZE must be a multiple of 8.
 //
 #define DXE_PERFORMANCE_STRING_SIZE     32
 #define DXE_PERFORMANCE_STRING_LENGTH   (DXE_PERFORMANCE_STRING_SIZE - 1)

 //
 // The default guage entries number for DXE phase.
 //
 #define INIT_DXE_GAUGE_DATA_ENTRIES     800

 typedef struct {
   EFI_PHYSICAL_ADDRESS  Handle;
   CHAR8                 Token[DXE_PERFORMANCE_STRING_SIZE];  ///< Measured token string name.
   CHAR8                 Module[DXE_PERFORMANCE_STRING_SIZE]; ///< Module string name.
   UINT64                StartTimeStamp;                      ///< Start time point.
   UINT64                EndTimeStamp;                        ///< End time point.
 } GAUGE_DATA_ENTRY;

 typedef struct {
   EFI_PHYSICAL_ADDRESS  Handle;
   CHAR8                 Token[DXE_PERFORMANCE_STRING_SIZE];  ///< Measured token string name.
   CHAR8                 Module[DXE_PERFORMANCE_STRING_SIZE]; ///< Module string name.
   UINT64                StartTimeStamp;                      ///< Start time point.
   UINT64                EndTimeStamp;                        ///< End time point.
   UINT32                Identifier;                          ///< Identifier.
 } GAUGE_DATA_ENTRY_EX;

 //
 // The header must be aligned at 8 bytes
 //
 typedef struct {
   UINT32                NumberOfEntries; ///< The number of all performance gauge entries.
   UINT32                Reserved;
 } GAUGE_DATA_HEADER;

 //
 // SMM Performance Protocol definitions
 //

 #define SMM_PERFORMANCE_PROTOCOL_GUID \
   { 0xf866226a, 0xeaa5, 0x4f5a, { 0xa9, 0xa,  0x6c, 0xfb, 0xa5, 0x7c, 0x58, 0x8e } }

 #define SMM_PERFORMANCE_EX_PROTOCOL_GUID \
   { 0x931fc048, 0xc71d, 0x4455, { 0x89, 0x30, 0x47, 0x6,  0x30, 0xe3, 0xe,  0xe5 } }

 //
 // SMM_PERFORMANCE_STRING_SIZE.
 //
 #define SMM_PERFORMANCE_STRING_SIZE     32
 #define SMM_PERFORMANCE_STRING_LENGTH   (SMM_PERFORMANCE_STRING_SIZE - 1)

 //
 // The default guage entries number for SMM phase.
 //
 #define INIT_SMM_GAUGE_DATA_ENTRIES     200

 typedef struct {
   UINTN             Function;
   EFI_STATUS        ReturnStatus;
   UINTN             NumberOfEntries;
   UINTN             LogEntryKey;
   GAUGE_DATA_ENTRY  *GaugeData;
 } SMM_PERF_COMMUNICATE;

 typedef struct {
   UINTN                Function;
   EFI_STATUS           ReturnStatus;
   UINTN                NumberOfEntries;
   UINTN                LogEntryKey;
   GAUGE_DATA_ENTRY_EX  *GaugeDataEx;
 } SMM_PERF_COMMUNICATE_EX;

 #define SMM_PERF_FUNCTION_GET_GAUGE_ENTRY_NUMBER          1
 #define SMM_PERF_FUNCTION_GET_GAUGE_DATA                  2

 /**
   Adds a record at the end of the performance measurement log
   that records the start time of a performance measurement.

   The added record contains the Handle, Token, and Module.
   The end time of the new record is not recorded, so it is set to zero.
   If TimeStamp is not zero, then TimeStamp is used to fill in the start time in the record.
   If TimeStamp is zero, the start time in the record is filled in with the value
   read from the current time stamp.

   @param  Handle                  The pointer to environment specific context used
                                   to identify the component being measured.
   @param  Token                   The pointer to a Null-terminated ASCII string
                                   that identifies the component being measured.
   @param  Module                  The pointer to a Null-terminated ASCII string
                                   that identifies the module being measured.
   @param  TimeStamp               The 64-bit time stamp.

   @retval EFI_SUCCESS             The data was read correctly from the device.
   @retval EFI_OUT_OF_RESOURCES    There are not enough resources to record the measurement.

 **/
 typedef
 EFI_STATUS
 (EFIAPI * PERFORMANCE_START_GAUGE)(
   IN CONST VOID   *Handle,  OPTIONAL
   IN CONST CHAR8  *Token,   OPTIONAL
   IN CONST CHAR8  *Module,  OPTIONAL
   IN UINT64       TimeStamp
   );

 /**
   Searches the performance measurement log from the beginning of the log
   for the first matching record that contains a zero end time and fills in a valid end time.

   Searches the performance measurement log from the beginning of the log
   for the first record that matches Handle, Token, and Module, and has an end time value of zero.
   If the record can not be found then return EFI_NOT_FOUND.
   If the record is found and TimeStamp is not zero,
   then the end time in the record is filled in with the value specified by TimeStamp.
   If the record is found and TimeStamp is zero, then the end time in the matching record
   is filled in with the current time stamp value.

   @param  Handle                  The pointer to environment specific context used
                                   to identify the component being measured.
   @param  Token                   The pointer to a Null-terminated ASCII string
                                   that identifies the component being measured.
   @param  Module                  The pointer to a Null-terminated ASCII string
                                   that identifies the module being measured.
   @param  TimeStamp               The 64-bit time stamp.

   @retval EFI_SUCCESS             The end of  the measurement was recorded.
   @retval EFI_NOT_FOUND           The specified measurement record could not be found.

 **/
 typedef
 EFI_STATUS
 (EFIAPI * PERFORMANCE_END_GAUGE)(
   IN CONST VOID   *Handle,  OPTIONAL
   IN CONST CHAR8  *Token,   OPTIONAL
   IN CONST CHAR8  *Module,  OPTIONAL
   IN UINT64       TimeStamp
   );

 /**
   Retrieves a previously logged performance measurement.
   It can also retrieve the log created by StartGaugeEx and EndGaugeEx of PERFORMANCE_EX_PROTOCOL,
   and then eliminate the Identifier.

   Retrieves the performance log entry from the performance log specified by LogEntryKey.
   If it stands for a valid entry, then EFI_SUCCESS is returned and
   GaugeDataEntry stores the pointer to that entry.

   @param  LogEntryKey             The key for the previous performance measurement log entry.
                                   If 0, then the first performance measurement log entry is retrieved.
   @param  GaugeDataEntry          Out parameter for the indirect pointer to the gauge data entry specified by LogEntryKey.

   @retval EFI_SUCCESS             The GuageDataEntry is successfully found based on LogEntryKey.
   @retval EFI_NOT_FOUND           There is no entry after the measurement referred to by LogEntryKey.
   @retval EFI_INVALID_PARAMETER   The LogEntryKey is not a valid entry, or GaugeDataEntry is NULL.

 **/
 typedef
 EFI_STATUS
 (EFIAPI * PERFORMANCE_GET_GAUGE)(
   IN  UINTN               LogEntryKey,
   OUT GAUGE_DATA_ENTRY    **GaugeDataEntry
   );

 /**
   Adds a record at the end of the performance measurement log
   that records the start time of a performance measurement.

   The added record contains the Handle, Token, Module and Identifier.
   The end time of the new record is not recorded, so it is set to zero.
   If TimeStamp is not zero, then TimeStamp is used to fill in the start time in the record.
   If TimeStamp is zero, the start time in the record is filled in with the value
   read from the current time stamp.

   @param  Handle                  The pointer to environment specific context used
                                   to identify the component being measured.
   @param  Token                   The pointer to a Null-terminated ASCII string
                                   that identifies the component being measured.
   @param  Module                  The pointer to a Null-terminated ASCII string
                                   that identifies the module being measured.
   @param  TimeStamp               The 64-bit time stamp.
   @param  Identifier              32-bit identifier. If the value is 0, the created record
                                   is same as the one created by StartGauge of PERFORMANCE_PROTOCOL.

   @retval EFI_SUCCESS             The data was read correctly from the device.
   @retval EFI_OUT_OF_RESOURCES    There are not enough resources to record the measurement.

 **/
 typedef
 EFI_STATUS
 (EFIAPI * PERFORMANCE_START_GAUGE_EX)(
   IN CONST VOID   *Handle,  OPTIONAL
   IN CONST CHAR8  *Token,   OPTIONAL
   IN CONST CHAR8  *Module,  OPTIONAL
   IN UINT64       TimeStamp,
   IN UINT32       Identifier
   );

 /**
   Searches the performance measurement log from the beginning of the log
   for the first matching record that contains a zero end time and fills in a valid end time.

   Searches the performance measurement log from the beginning of the log
   for the first record that matches Handle, Token, Module and Identifier, and has an end time value of zero.
   If the record can not be found then return EFI_NOT_FOUND.
   If the record is found and TimeStamp is not zero,
   then the end time in the record is filled in with the value specified by TimeStamp.
   If the record is found and TimeStamp is zero, then the end time in the matching record
   is filled in with the current time stamp value.

   @param  Handle                  The pointer to environment specific context used
                                   to identify the component being measured.
   @param  Token                   The pointer to a Null-terminated ASCII string
                                   that identifies the component being measured.
   @param  Module                  The pointer to a Null-terminated ASCII string
                                   that identifies the module being measured.
   @param  TimeStamp               The 64-bit time stamp.
   @param  Identifier              32-bit identifier. If the value is 0, the found record
                                   is same as the one found by EndGauge of PERFORMANCE_PROTOCOL.

   @retval EFI_SUCCESS             The end of  the measurement was recorded.
   @retval EFI_NOT_FOUND           The specified measurement record could not be found.

 **/
 typedef
 EFI_STATUS
 (EFIAPI * PERFORMANCE_END_GAUGE_EX)(
   IN CONST VOID   *Handle,  OPTIONAL
   IN CONST CHAR8  *Token,   OPTIONAL
   IN CONST CHAR8  *Module,  OPTIONAL
   IN UINT64       TimeStamp,
   IN UINT32       Identifier
   );

 /**
   Retrieves a previously logged performance measurement.
   It can also retrieve the log created by StartGauge and EndGauge of PERFORMANCE_PROTOCOL,
   and then assign the Identifier with 0.

   Retrieves the performance log entry from the performance log specified by LogEntryKey.
   If it stands for a valid entry, then EFI_SUCCESS is returned and
   GaugeDataEntryEx stores the pointer to that entry.

   @param  LogEntryKey             The key for the previous performance measurement log entry.
                                   If 0, then the first performance measurement log entry is retrieved.
   @param  GaugeDataEntryEx        Out parameter for the indirect pointer to the extented gauge data entry specified by LogEntryKey.

   @retval EFI_SUCCESS             The GuageDataEntryEx is successfully found based on LogEntryKey.
   @retval EFI_NOT_FOUND           There is no entry after the measurement referred to by LogEntryKey.
   @retval EFI_INVALID_PARAMETER   The LogEntryKey is not a valid entry, or GaugeDataEntryEx is NULL.

 **/
 typedef
 EFI_STATUS
 (EFIAPI * PERFORMANCE_GET_GAUGE_EX)(
   IN  UINTN                 LogEntryKey,
   OUT GAUGE_DATA_ENTRY_EX   **GaugeDataEntryEx
   );

 struct _PERFORMANCE_PROTOCOL {
   PERFORMANCE_START_GAUGE             StartGauge;
   PERFORMANCE_END_GAUGE               EndGauge;
   PERFORMANCE_GET_GAUGE               GetGauge;
 };

 struct _PERFORMANCE_EX_PROTOCOL {
   PERFORMANCE_START_GAUGE_EX          StartGaugeEx;
   PERFORMANCE_END_GAUGE_EX            EndGaugeEx;
   PERFORMANCE_GET_GAUGE_EX            GetGaugeEx;
 };

 extern EFI_GUID gPerformanceProtocolGuid;
 extern EFI_GUID gSmmPerformanceProtocolGuid;
 extern EFI_GUID gPerformanceExProtocolGuid;
 extern EFI_GUID gSmmPerformanceExProtocolGuid;

 #endif
	/** @file
	This file defines performance-related definitions, including the format of:
	* performance GUID HOB.
	* performance protocol interfaces.
	* performance variables.

	Copyright (c) 2009 - 2018, 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 that 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.

	**/

	#ifndef __PERFORMANCE_DATA_H__
	#define __PERFORMANCE_DATA_H__

	#define PERFORMANCE_PROPERTY_REVISION 0x1

	typedef struct {
	UINT32 Revision;
	UINT32 Reserved;
	UINT64 Frequency;
	UINT64 TimerStartValue;
	UINT64 TimerEndValue;
	} PERFORMANCE_PROPERTY;

	//
	// PEI_PERFORMANCE_STRING_SIZE must be a multiple of 8.
	//
	#define PEI_PERFORMANCE_STRING_SIZE 8
	#define PEI_PERFORMANCE_STRING_LENGTH (PEI_PERFORMANCE_STRING_SIZE - 1)

	typedef struct {
	EFI_PHYSICAL_ADDRESS Handle;
	CHAR8 Token[PEI_PERFORMANCE_STRING_SIZE]; ///< Measured token string name.
	CHAR8 Module[PEI_PERFORMANCE_STRING_SIZE]; ///< Module string name.
	UINT64 StartTimeStamp; ///< Start time point.
	UINT64 EndTimeStamp; ///< End time point.
	} PEI_PERFORMANCE_LOG_ENTRY;

	//
	// The header must be aligned at 8 bytes.
	//
	typedef struct {
	UINT32 NumberOfEntries; ///< The number of all performance log entries.
	UINT32 Reserved;
	} PEI_PERFORMANCE_LOG_HEADER;


	#define PERFORMANCE_PROTOCOL_GUID \
	{ 0x76b6bdfa, 0x2acd, 0x4462, { 0x9E, 0x3F, 0xcb, 0x58, 0xC9, 0x69, 0xd9, 0x37 } }

	#define PERFORMANCE_EX_PROTOCOL_GUID \
	{ 0x1ea81bec, 0xf01a, 0x4d98, { 0xa2, 0x1, 0x4a, 0x61, 0xce, 0x2f, 0xc0, 0x22 } }

	//
	// Forward reference for pure ANSI compatibility
	//
	typedef struct _PERFORMANCE_PROTOCOL PERFORMANCE_PROTOCOL;
	typedef struct _PERFORMANCE_EX_PROTOCOL PERFORMANCE_EX_PROTOCOL;

	//
	// DXE_PERFORMANCE_STRING_SIZE must be a multiple of 8.
	//
	#define DXE_PERFORMANCE_STRING_SIZE 32
	#define DXE_PERFORMANCE_STRING_LENGTH (DXE_PERFORMANCE_STRING_SIZE - 1)

	//
	// The default guage entries number for DXE phase.
	//
	#define INIT_DXE_GAUGE_DATA_ENTRIES 800

	typedef struct {
	EFI_PHYSICAL_ADDRESS Handle;
	CHAR8 Token[DXE_PERFORMANCE_STRING_SIZE]; ///< Measured token string name.
	CHAR8 Module[DXE_PERFORMANCE_STRING_SIZE]; ///< Module string name.
	UINT64 StartTimeStamp; ///< Start time point.
	UINT64 EndTimeStamp; ///< End time point.
	} GAUGE_DATA_ENTRY;

	typedef struct {
	EFI_PHYSICAL_ADDRESS Handle;
	CHAR8 Token[DXE_PERFORMANCE_STRING_SIZE]; ///< Measured token string name.
	CHAR8 Module[DXE_PERFORMANCE_STRING_SIZE]; ///< Module string name.
	UINT64 StartTimeStamp; ///< Start time point.
	UINT64 EndTimeStamp; ///< End time point.
	UINT32 Identifier; ///< Identifier.
	} GAUGE_DATA_ENTRY_EX;

	//
	// The header must be aligned at 8 bytes
	//
	typedef struct {
	UINT32 NumberOfEntries; ///< The number of all performance gauge entries.
	UINT32 Reserved;
	} GAUGE_DATA_HEADER;

	//
	// SMM Performance Protocol definitions
	//

	#define SMM_PERFORMANCE_PROTOCOL_GUID \
	{ 0xf866226a, 0xeaa5, 0x4f5a, { 0xa9, 0xa, 0x6c, 0xfb, 0xa5, 0x7c, 0x58, 0x8e } }

	#define SMM_PERFORMANCE_EX_PROTOCOL_GUID \
	{ 0x931fc048, 0xc71d, 0x4455, { 0x89, 0x30, 0x47, 0x6, 0x30, 0xe3, 0xe, 0xe5 } }

	//
	// SMM_PERFORMANCE_STRING_SIZE.
	//
	#define SMM_PERFORMANCE_STRING_SIZE 32
	#define SMM_PERFORMANCE_STRING_LENGTH (SMM_PERFORMANCE_STRING_SIZE - 1)

	//
	// The default guage entries number for SMM phase.
	//
	#define INIT_SMM_GAUGE_DATA_ENTRIES 200

	typedef struct {
	UINTN Function;
	EFI_STATUS ReturnStatus;
	UINTN NumberOfEntries;
	UINTN LogEntryKey;
	GAUGE_DATA_ENTRY *GaugeData;
	} SMM_PERF_COMMUNICATE;

	typedef struct {
	UINTN Function;
	EFI_STATUS ReturnStatus;
	UINTN NumberOfEntries;
	UINTN LogEntryKey;
	GAUGE_DATA_ENTRY_EX *GaugeDataEx;
	} SMM_PERF_COMMUNICATE_EX;

	#define SMM_PERF_FUNCTION_GET_GAUGE_ENTRY_NUMBER 1
	#define SMM_PERF_FUNCTION_GET_GAUGE_DATA 2

	/**
	Adds a record at the end of the performance measurement log
	that records the start time of a performance measurement.

	The added record contains the Handle, Token, and Module.
	The end time of the new record is not recorded, so it is set to zero.
	If TimeStamp is not zero, then TimeStamp is used to fill in the start time in the record.
	If TimeStamp is zero, the start time in the record is filled in with the value
	read from the current time stamp.

	@param Handle The pointer to environment specific context used
	to identify the component being measured.
	@param Token The pointer to a Null-terminated ASCII string
	that identifies the component being measured.
	@param Module The pointer to a Null-terminated ASCII string
	that identifies the module being measured.
	@param TimeStamp The 64-bit time stamp.

	@retval EFI_SUCCESS The data was read correctly from the device.
	@retval EFI_OUT_OF_RESOURCES There are not enough resources to record the measurement.

	**/
	typedef
	EFI_STATUS
	(EFIAPI * PERFORMANCE_START_GAUGE)(
	IN CONST VOID *Handle, OPTIONAL
	IN CONST CHAR8 *Token, OPTIONAL
	IN CONST CHAR8 *Module, OPTIONAL
	IN UINT64 TimeStamp
	);

	/**
	Searches the performance measurement log from the beginning of the log
	for the first matching record that contains a zero end time and fills in a valid end time.

	Searches the performance measurement log from the beginning of the log
	for the first record that matches Handle, Token, and Module, and has an end time value of zero.
	If the record can not be found then return EFI_NOT_FOUND.
	If the record is found and TimeStamp is not zero,
	then the end time in the record is filled in with the value specified by TimeStamp.
	If the record is found and TimeStamp is zero, then the end time in the matching record
	is filled in with the current time stamp value.

	@param Handle The pointer to environment specific context used
	to identify the component being measured.
	@param Token The pointer to a Null-terminated ASCII string
	that identifies the component being measured.
	@param Module The pointer to a Null-terminated ASCII string
	that identifies the module being measured.
	@param TimeStamp The 64-bit time stamp.

	@retval EFI_SUCCESS The end of the measurement was recorded.
	@retval EFI_NOT_FOUND The specified measurement record could not be found.

	**/
	typedef
	EFI_STATUS
	(EFIAPI * PERFORMANCE_END_GAUGE)(
	IN CONST VOID *Handle, OPTIONAL
	IN CONST CHAR8 *Token, OPTIONAL
	IN CONST CHAR8 *Module, OPTIONAL
	IN UINT64 TimeStamp
	);

	/**
	Retrieves a previously logged performance measurement.
	It can also retrieve the log created by StartGaugeEx and EndGaugeEx of PERFORMANCE_EX_PROTOCOL,
	and then eliminate the Identifier.

	Retrieves the performance log entry from the performance log specified by LogEntryKey.
	If it stands for a valid entry, then EFI_SUCCESS is returned and
	GaugeDataEntry stores the pointer to that entry.

	@param LogEntryKey The key for the previous performance measurement log entry.
	If 0, then the first performance measurement log entry is retrieved.
	@param GaugeDataEntry Out parameter for the indirect pointer to the gauge data entry specified by LogEntryKey.

	@retval EFI_SUCCESS The GuageDataEntry is successfully found based on LogEntryKey.
	@retval EFI_NOT_FOUND There is no entry after the measurement referred to by LogEntryKey.
	@retval EFI_INVALID_PARAMETER The LogEntryKey is not a valid entry, or GaugeDataEntry is NULL.

	**/
	typedef
	EFI_STATUS
	(EFIAPI * PERFORMANCE_GET_GAUGE)(
	IN UINTN LogEntryKey,
	OUT GAUGE_DATA_ENTRY **GaugeDataEntry
	);

	/**
	Adds a record at the end of the performance measurement log
	that records the start time of a performance measurement.

	The added record contains the Handle, Token, Module and Identifier.
	The end time of the new record is not recorded, so it is set to zero.
	If TimeStamp is not zero, then TimeStamp is used to fill in the start time in the record.
	If TimeStamp is zero, the start time in the record is filled in with the value
	read from the current time stamp.

	@param Handle The pointer to environment specific context used
	to identify the component being measured.
	@param Token The pointer to a Null-terminated ASCII string
	that identifies the component being measured.
	@param Module The pointer to a Null-terminated ASCII string
	that identifies the module being measured.
	@param TimeStamp The 64-bit time stamp.
	@param Identifier 32-bit identifier. If the value is 0, the created record
	is same as the one created by StartGauge of PERFORMANCE_PROTOCOL.

	@retval EFI_SUCCESS The data was read correctly from the device.
	@retval EFI_OUT_OF_RESOURCES There are not enough resources to record the measurement.

	**/
	typedef
	EFI_STATUS
	(EFIAPI * PERFORMANCE_START_GAUGE_EX)(
	IN CONST VOID *Handle, OPTIONAL
	IN CONST CHAR8 *Token, OPTIONAL
	IN CONST CHAR8 *Module, OPTIONAL
	IN UINT64 TimeStamp,
	IN UINT32 Identifier
	);

	/**
	Searches the performance measurement log from the beginning of the log
	for the first matching record that contains a zero end time and fills in a valid end time.

	Searches the performance measurement log from the beginning of the log
	for the first record that matches Handle, Token, Module and Identifier, and has an end time value of zero.
	If the record can not be found then return EFI_NOT_FOUND.
	If the record is found and TimeStamp is not zero,
	then the end time in the record is filled in with the value specified by TimeStamp.
	If the record is found and TimeStamp is zero, then the end time in the matching record
	is filled in with the current time stamp value.

	@param Handle The pointer to environment specific context used
	to identify the component being measured.
	@param Token The pointer to a Null-terminated ASCII string
	that identifies the component being measured.
	@param Module The pointer to a Null-terminated ASCII string
	that identifies the module being measured.
	@param TimeStamp The 64-bit time stamp.
	@param Identifier 32-bit identifier. If the value is 0, the found record
	is same as the one found by EndGauge of PERFORMANCE_PROTOCOL.

	@retval EFI_SUCCESS The end of the measurement was recorded.
	@retval EFI_NOT_FOUND The specified measurement record could not be found.

	**/
	typedef
	EFI_STATUS
	(EFIAPI * PERFORMANCE_END_GAUGE_EX)(
	IN CONST VOID *Handle, OPTIONAL
	IN CONST CHAR8 *Token, OPTIONAL
	IN CONST CHAR8 *Module, OPTIONAL
	IN UINT64 TimeStamp,
	IN UINT32 Identifier
	);

	/**
	Retrieves a previously logged performance measurement.
	It can also retrieve the log created by StartGauge and EndGauge of PERFORMANCE_PROTOCOL,
	and then assign the Identifier with 0.

	Retrieves the performance log entry from the performance log specified by LogEntryKey.
	If it stands for a valid entry, then EFI_SUCCESS is returned and
	GaugeDataEntryEx stores the pointer to that entry.

	@param LogEntryKey The key for the previous performance measurement log entry.
	If 0, then the first performance measurement log entry is retrieved.
	@param GaugeDataEntryEx Out parameter for the indirect pointer to the extented gauge data entry specified by LogEntryKey.

	@retval EFI_SUCCESS The GuageDataEntryEx is successfully found based on LogEntryKey.
	@retval EFI_NOT_FOUND There is no entry after the measurement referred to by LogEntryKey.
	@retval EFI_INVALID_PARAMETER The LogEntryKey is not a valid entry, or GaugeDataEntryEx is NULL.

	**/
	typedef
	EFI_STATUS
	(EFIAPI * PERFORMANCE_GET_GAUGE_EX)(
	IN UINTN LogEntryKey,
	OUT GAUGE_DATA_ENTRY_EX **GaugeDataEntryEx
	);

	struct _PERFORMANCE_PROTOCOL {
	PERFORMANCE_START_GAUGE StartGauge;
	PERFORMANCE_END_GAUGE EndGauge;
	PERFORMANCE_GET_GAUGE GetGauge;
	};

	struct _PERFORMANCE_EX_PROTOCOL {
	PERFORMANCE_START_GAUGE_EX StartGaugeEx;
	PERFORMANCE_END_GAUGE_EX EndGaugeEx;
	PERFORMANCE_GET_GAUGE_EX GetGaugeEx;
	};

	extern EFI_GUID gPerformanceProtocolGuid;
	extern EFI_GUID gSmmPerformanceProtocolGuid;
	extern EFI_GUID gPerformanceExProtocolGuid;
	extern EFI_GUID gSmmPerformanceExProtocolGuid;

	#endif