MdePkg/Include/Ppi/MpServices.h - third_party/edk2 - Git at Google

 /** @file
   This file declares UEFI PI Multi-processor PPI.
   This PPI is installed by some platform or chipset-specific PEIM that abstracts
   handling multiprocessor support.

   Copyright (c) 2015 - 2017, 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.

   @par Revision Reference:
   This PPI is introduced in PI Version 1.4.

 **/

 #ifndef __PEI_MP_SERVICES_PPI_H__
 #define __PEI_MP_SERVICES_PPI_H__

 #include <Protocol/MpService.h>

 #define EFI_PEI_MP_SERVICES_PPI_GUID \
   { \
     0xee16160a, 0xe8be, 0x47a6, { 0x82, 0xa, 0xc6, 0x90, 0xd, 0xb0, 0x25, 0xa } \
   }

 typedef struct _EFI_PEI_MP_SERVICES_PPI  EFI_PEI_MP_SERVICES_PPI ;

 /**
   Get the number of CPU's.

   @param[in]  PeiServices         An indirect pointer to the PEI Services Table
                                   published by the PEI Foundation.
   @param[in]  This                Pointer to this instance of the PPI.
   @param[out] NumberOfProcessors  Pointer to the total number of logical processors in
                                   the system, including the BSP and disabled APs.
   @param[out] NumberOfEnabledProcessors
                                   Number of processors in the system that are enabled.

   @retval EFI_SUCCESS             The number of logical processors and enabled
                                   logical processors was retrieved.
   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
   @retval EFI_INVALID_PARAMETER   NumberOfProcessors is NULL.
                                   NumberOfEnabledProcessors is NULL.
 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PEI_MP_SERVICES_GET_NUMBER_OF_PROCESSORS) (
   IN  CONST EFI_PEI_SERVICES      **PeiServices,
   IN  EFI_PEI_MP_SERVICES_PPI     *This,
   OUT UINTN                       *NumberOfProcessors,
   OUT UINTN                       *NumberOfEnabledProcessors
   );

 /**
   Get information on a specific CPU.

   @param[in]  PeiServices         An indirect pointer to the PEI Services Table
                                   published by the PEI Foundation.
   @param[in]  This                Pointer to this instance of the PPI.
   @param[in]  ProcessorNumber     Pointer to the total number of logical processors in
                                   the system, including the BSP and disabled APs.
   @param[out] ProcessorInfoBuffer Number of processors in the system that are enabled.

   @retval EFI_SUCCESS             Processor information was returned.
   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
   @retval EFI_INVALID_PARAMETER   ProcessorInfoBuffer is NULL.
   @retval EFI_NOT_FOUND           The processor with the handle specified by
                                   ProcessorNumber does not exist in the platform.
 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PEI_MP_SERVICES_GET_PROCESSOR_INFO) (
   IN  CONST EFI_PEI_SERVICES      **PeiServices,
   IN  EFI_PEI_MP_SERVICES_PPI     *This,
   IN  UINTN                       ProcessorNumber,
   OUT EFI_PROCESSOR_INFORMATION   *ProcessorInfoBuffer
   );

 /**
   Activate all of the application proessors.

   @param[in] PeiServices          An indirect pointer to the PEI Services Table
                                   published by the PEI Foundation.
   @param[in] This                 A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
   @param[in] Procedure            A pointer to the function to be run on enabled APs of
                                   the system.
   @param[in] SingleThread         If TRUE, then all the enabled APs execute the function
                                   specified by Procedure one by one, in ascending order
                                   of processor handle number. If FALSE, then all the
                                   enabled APs execute the function specified by Procedure
                                   simultaneously.
   @param[in] TimeoutInMicroSeconds
                                   Indicates the time limit in microseconds for APs to
                                   return from Procedure, for blocking mode only. Zero
                                   means infinity. If the timeout expires before all APs
                                   return from Procedure, then Procedure on the failed APs
                                   is terminated. All enabled APs are available for next
                                   function assigned by EFI_PEI_MP_SERVICES_PPI.StartupAllAPs()
                                   or EFI_PEI_MP_SERVICES_PPI.StartupThisAP(). If the
                                   timeout expires in blocking mode, BSP returns
                                   EFI_TIMEOUT.
   @param[in] ProcedureArgument    The parameter passed into Procedure for all APs.

   @retval EFI_SUCCESS             In blocking mode, all APs have finished before the
                                   timeout expired.
   @retval EFI_DEVICE_ERROR        Caller processor is AP.
   @retval EFI_NOT_STARTED         No enabled APs exist in the system.
   @retval EFI_NOT_READY           Any enabled APs are busy.
   @retval EFI_TIMEOUT             In blocking mode, the timeout expired before all
                                   enabled APs have finished.
   @retval EFI_INVALID_PARAMETER   Procedure is NULL.
 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PEI_MP_SERVICES_STARTUP_ALL_APS) (
   IN  CONST EFI_PEI_SERVICES      **PeiServices,
   IN  EFI_PEI_MP_SERVICES_PPI     *This,
   IN  EFI_AP_PROCEDURE            Procedure,
   IN  BOOLEAN                     SingleThread,
   IN  UINTN                       TimeoutInMicroSeconds,
   IN  VOID                        *ProcedureArgument      OPTIONAL
   );

 /**
   Activate a specific application processor.

   @param[in] PeiServices          An indirect pointer to the PEI Services Table
                                   published by the PEI Foundation.
   @param[in] This                 A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
   @param[in] Procedure            A pointer to the function to be run on enabled APs of
                                   the system.
   @param[in] ProcessorNumber      The handle number of the AP. The range is from 0 to the
                                   total number of logical processors minus 1. The total
                                   number of logical processors can be retrieved by
                                   EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
   @param[in] TimeoutInMicroSeconds
                                   Indicates the time limit in microseconds for APs to
                                   return from Procedure, for blocking mode only. Zero
                                   means infinity. If the timeout expires before all APs
                                   return from Procedure, then Procedure on the failed APs
                                   is terminated. All enabled APs are available for next
                                   function assigned by EFI_PEI_MP_SERVICES_PPI.StartupAllAPs()
                                   or EFI_PEI_MP_SERVICES_PPI.StartupThisAP(). If the
                                   timeout expires in blocking mode, BSP returns
                                   EFI_TIMEOUT.
   @param[in] ProcedureArgument    The parameter passed into Procedure for all APs.

   @retval EFI_SUCCESS             In blocking mode, specified AP finished before the
                                   timeout expires.
   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
   @retval EFI_TIMEOUT             In blocking mode, the timeout expired before the
                                   specified AP has finished.
   @retval EFI_NOT_FOUND           The processor with the handle specified by
                                   ProcessorNumber does not exist.
   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the BSP or disabled AP.
   @retval EFI_INVALID_PARAMETER   Procedure is NULL.
 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PEI_MP_SERVICES_STARTUP_THIS_AP) (
   IN  CONST EFI_PEI_SERVICES      **PeiServices,
   IN  EFI_PEI_MP_SERVICES_PPI     *This,
   IN  EFI_AP_PROCEDURE            Procedure,
   IN  UINTN                       ProcessorNumber,
   IN  UINTN                       TimeoutInMicroseconds,
   IN  VOID                        *ProcedureArgument      OPTIONAL
   );

 /**
   Switch the boot strap processor.

   @param[in] PeiServices          An indirect pointer to the PEI Services Table
                                   published by the PEI Foundation.
   @param[in] This                 A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
   @param[in] ProcessorNumber      The handle number of the AP. The range is from 0 to the
                                   total number of logical processors minus 1. The total
                                   number of logical processors can be retrieved by
                                   EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
   @param[in] EnableOldBSP         If TRUE, then the old BSP will be listed as an enabled
                                   AP. Otherwise, it will be disabled.

   @retval EFI_SUCCESS             BSP successfully switched.
   @retval EFI_UNSUPPORTED         Switching the BSP cannot be completed prior to this
                                   service returning.
   @retval EFI_UNSUPPORTED         Switching the BSP is not supported.
   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
   @retval EFI_NOT_FOUND           The processor with the handle specified by
                                   ProcessorNumber does not exist.
   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the current BSP or a disabled
                                   AP.
   @retval EFI_NOT_READY           The specified AP is busy.
 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PEI_MP_SERVICES_SWITCH_BSP) (
   IN  CONST EFI_PEI_SERVICES      **PeiServices,
   IN  EFI_PEI_MP_SERVICES_PPI     *This,
   IN  UINTN                       ProcessorNumber,
   IN  BOOLEAN                     EnableOldBSP
   );

 /**
   Enable or disable an application processor.

   @param[in] PeiServices          An indirect pointer to the PEI Services Table
                                   published by the PEI Foundation.
   @param[in] This                 A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
   @param[in] ProcessorNumber      The handle number of the AP. The range is from 0 to the
                                   total number of logical processors minus 1. The total
                                   number of logical processors can be retrieved by
                                   EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
   @param[in] EnableAP             Specifies the new state for the processor for enabled,
                                   FALSE for disabled.
   @param[in] HealthFlag           If not NULL, a pointer to a value that specifies the
                                   new health status of the AP. This flag corresponds to
                                   StatusFlag defined in EFI_PEI_MP_SERVICES_PPI.GetProcessorInfo().
                                   Only the PROCESSOR_HEALTH_STATUS_BIT is used. All other
                                   bits are ignored. If it is NULL, this parameter is
                                   ignored.

   @retval EFI_SUCCESS             The specified AP was enabled or disabled successfully.
   @retval EFI_UNSUPPORTED         Enabling or disabling an AP cannot be completed prior
                                   to this service returning.
   @retval EFI_UNSUPPORTED         Enabling or disabling an AP is not supported.
   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
   @retval EFI_NOT_FOUND           Processor with the handle specified by ProcessorNumber
                                   does not exist.
   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the BSP.
 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PEI_MP_SERVICES_ENABLEDISABLEAP) (
   IN  CONST EFI_PEI_SERVICES      **PeiServices,
   IN  EFI_PEI_MP_SERVICES_PPI     *This,
   IN  UINTN                       ProcessorNumber,
   IN  BOOLEAN                     EnableAP,
   IN  UINT32                      *HealthFlag      OPTIONAL
   );

 /**
   Identify the currently executing processor.

   @param[in]  PeiServices         An indirect pointer to the PEI Services Table
                                   published by the PEI Foundation.
   @param[in]  This                A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
   @param[out] ProcessorNumber     The handle number of the AP. The range is from 0 to the
                                   total number of logical processors minus 1. The total
                                   number of logical processors can be retrieved by
                                   EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().

   @retval EFI_SUCCESS             The current processor handle number was returned in
                                   ProcessorNumber.
   @retval EFI_INVALID_PARAMETER   ProcessorNumber is NULL.
 **/
 typedef
 EFI_STATUS
 (EFIAPI *EFI_PEI_MP_SERVICES_WHOAMI) (
   IN  CONST EFI_PEI_SERVICES      **PeiServices,
   IN  EFI_PEI_MP_SERVICES_PPI     *This,
   OUT UINTN                       *ProcessorNumber
   );

 ///
 /// This PPI is installed by some platform or chipset-specific PEIM that abstracts
 /// handling multiprocessor support.
 ///
 struct _EFI_PEI_MP_SERVICES_PPI {
   EFI_PEI_MP_SERVICES_GET_NUMBER_OF_PROCESSORS   GetNumberOfProcessors;
   EFI_PEI_MP_SERVICES_GET_PROCESSOR_INFO         GetProcessorInfo;
   EFI_PEI_MP_SERVICES_STARTUP_ALL_APS            StartupAllAPs;
   EFI_PEI_MP_SERVICES_STARTUP_THIS_AP            StartupThisAP;
   EFI_PEI_MP_SERVICES_SWITCH_BSP                 SwitchBSP;
   EFI_PEI_MP_SERVICES_ENABLEDISABLEAP            EnableDisableAP;
   EFI_PEI_MP_SERVICES_WHOAMI                     WhoAmI;
 };

 extern EFI_GUID gEfiPeiMpServicesPpiGuid;

 #endif
	/** @file
	This file declares UEFI PI Multi-processor PPI.
	This PPI is installed by some platform or chipset-specific PEIM that abstracts
	handling multiprocessor support.

	Copyright (c) 2015 - 2017, 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.

	@par Revision Reference:
	This PPI is introduced in PI Version 1.4.

	**/

	#ifndef __PEI_MP_SERVICES_PPI_H__
	#define __PEI_MP_SERVICES_PPI_H__

	#include <Protocol/MpService.h>

	#define EFI_PEI_MP_SERVICES_PPI_GUID \
	{ \
	0xee16160a, 0xe8be, 0x47a6, { 0x82, 0xa, 0xc6, 0x90, 0xd, 0xb0, 0x25, 0xa } \
	}

	typedef struct _EFI_PEI_MP_SERVICES_PPI EFI_PEI_MP_SERVICES_PPI ;

	/**
	Get the number of CPU's.

	@param[in] PeiServices An indirect pointer to the PEI Services Table
	published by the PEI Foundation.
	@param[in] This Pointer to this instance of the PPI.
	@param[out] NumberOfProcessors Pointer to the total number of logical processors in
	the system, including the BSP and disabled APs.
	@param[out] NumberOfEnabledProcessors
	Number of processors in the system that are enabled.

	@retval EFI_SUCCESS The number of logical processors and enabled
	logical processors was retrieved.
	@retval EFI_DEVICE_ERROR The calling processor is an AP.
	@retval EFI_INVALID_PARAMETER NumberOfProcessors is NULL.
	NumberOfEnabledProcessors is NULL.
	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PEI_MP_SERVICES_GET_NUMBER_OF_PROCESSORS) (
	IN CONST EFI_PEI_SERVICES **PeiServices,
	IN EFI_PEI_MP_SERVICES_PPI *This,
	OUT UINTN *NumberOfProcessors,
	OUT UINTN *NumberOfEnabledProcessors
	);

	/**
	Get information on a specific CPU.

	@param[in] PeiServices An indirect pointer to the PEI Services Table
	published by the PEI Foundation.
	@param[in] This Pointer to this instance of the PPI.
	@param[in] ProcessorNumber Pointer to the total number of logical processors in
	the system, including the BSP and disabled APs.
	@param[out] ProcessorInfoBuffer Number of processors in the system that are enabled.

	@retval EFI_SUCCESS Processor information was returned.
	@retval EFI_DEVICE_ERROR The calling processor is an AP.
	@retval EFI_INVALID_PARAMETER ProcessorInfoBuffer is NULL.
	@retval EFI_NOT_FOUND The processor with the handle specified by
	ProcessorNumber does not exist in the platform.
	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PEI_MP_SERVICES_GET_PROCESSOR_INFO) (
	IN CONST EFI_PEI_SERVICES **PeiServices,
	IN EFI_PEI_MP_SERVICES_PPI *This,
	IN UINTN ProcessorNumber,
	OUT EFI_PROCESSOR_INFORMATION *ProcessorInfoBuffer
	);

	/**
	Activate all of the application proessors.

	@param[in] PeiServices An indirect pointer to the PEI Services Table
	published by the PEI Foundation.
	@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
	@param[in] Procedure A pointer to the function to be run on enabled APs of
	the system.
	@param[in] SingleThread If TRUE, then all the enabled APs execute the function
	specified by Procedure one by one, in ascending order
	of processor handle number. If FALSE, then all the
	enabled APs execute the function specified by Procedure
	simultaneously.
	@param[in] TimeoutInMicroSeconds
	Indicates the time limit in microseconds for APs to
	return from Procedure, for blocking mode only. Zero
	means infinity. If the timeout expires before all APs
	return from Procedure, then Procedure on the failed APs
	is terminated. All enabled APs are available for next
	function assigned by EFI_PEI_MP_SERVICES_PPI.StartupAllAPs()
	or EFI_PEI_MP_SERVICES_PPI.StartupThisAP(). If the
	timeout expires in blocking mode, BSP returns
	EFI_TIMEOUT.
	@param[in] ProcedureArgument The parameter passed into Procedure for all APs.

	@retval EFI_SUCCESS In blocking mode, all APs have finished before the
	timeout expired.
	@retval EFI_DEVICE_ERROR Caller processor is AP.
	@retval EFI_NOT_STARTED No enabled APs exist in the system.
	@retval EFI_NOT_READY Any enabled APs are busy.
	@retval EFI_TIMEOUT In blocking mode, the timeout expired before all
	enabled APs have finished.
	@retval EFI_INVALID_PARAMETER Procedure is NULL.
	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PEI_MP_SERVICES_STARTUP_ALL_APS) (
	IN CONST EFI_PEI_SERVICES **PeiServices,
	IN EFI_PEI_MP_SERVICES_PPI *This,
	IN EFI_AP_PROCEDURE Procedure,
	IN BOOLEAN SingleThread,
	IN UINTN TimeoutInMicroSeconds,
	IN VOID *ProcedureArgument OPTIONAL
	);

	/**
	Activate a specific application processor.

	@param[in] PeiServices An indirect pointer to the PEI Services Table
	published by the PEI Foundation.
	@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
	@param[in] Procedure A pointer to the function to be run on enabled APs of
	the system.
	@param[in] ProcessorNumber The handle number of the AP. The range is from 0 to the
	total number of logical processors minus 1. The total
	number of logical processors can be retrieved by
	EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
	@param[in] TimeoutInMicroSeconds
	Indicates the time limit in microseconds for APs to
	return from Procedure, for blocking mode only. Zero
	means infinity. If the timeout expires before all APs
	return from Procedure, then Procedure on the failed APs
	is terminated. All enabled APs are available for next
	function assigned by EFI_PEI_MP_SERVICES_PPI.StartupAllAPs()
	or EFI_PEI_MP_SERVICES_PPI.StartupThisAP(). If the
	timeout expires in blocking mode, BSP returns
	EFI_TIMEOUT.
	@param[in] ProcedureArgument The parameter passed into Procedure for all APs.

	@retval EFI_SUCCESS In blocking mode, specified AP finished before the
	timeout expires.
	@retval EFI_DEVICE_ERROR The calling processor is an AP.
	@retval EFI_TIMEOUT In blocking mode, the timeout expired before the
	specified AP has finished.
	@retval EFI_NOT_FOUND The processor with the handle specified by
	ProcessorNumber does not exist.
	@retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP or disabled AP.
	@retval EFI_INVALID_PARAMETER Procedure is NULL.
	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PEI_MP_SERVICES_STARTUP_THIS_AP) (
	IN CONST EFI_PEI_SERVICES **PeiServices,
	IN EFI_PEI_MP_SERVICES_PPI *This,
	IN EFI_AP_PROCEDURE Procedure,
	IN UINTN ProcessorNumber,
	IN UINTN TimeoutInMicroseconds,
	IN VOID *ProcedureArgument OPTIONAL
	);

	/**
	Switch the boot strap processor.

	@param[in] PeiServices An indirect pointer to the PEI Services Table
	published by the PEI Foundation.
	@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
	@param[in] ProcessorNumber The handle number of the AP. The range is from 0 to the
	total number of logical processors minus 1. The total
	number of logical processors can be retrieved by
	EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
	@param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an enabled
	AP. Otherwise, it will be disabled.

	@retval EFI_SUCCESS BSP successfully switched.
	@retval EFI_UNSUPPORTED Switching the BSP cannot be completed prior to this
	service returning.
	@retval EFI_UNSUPPORTED Switching the BSP is not supported.
	@retval EFI_DEVICE_ERROR The calling processor is an AP.
	@retval EFI_NOT_FOUND The processor with the handle specified by
	ProcessorNumber does not exist.
	@retval EFI_INVALID_PARAMETER ProcessorNumber specifies the current BSP or a disabled
	AP.
	@retval EFI_NOT_READY The specified AP is busy.
	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PEI_MP_SERVICES_SWITCH_BSP) (
	IN CONST EFI_PEI_SERVICES **PeiServices,
	IN EFI_PEI_MP_SERVICES_PPI *This,
	IN UINTN ProcessorNumber,
	IN BOOLEAN EnableOldBSP
	);

	/**
	Enable or disable an application processor.

	@param[in] PeiServices An indirect pointer to the PEI Services Table
	published by the PEI Foundation.
	@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
	@param[in] ProcessorNumber The handle number of the AP. The range is from 0 to the
	total number of logical processors minus 1. The total
	number of logical processors can be retrieved by
	EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().
	@param[in] EnableAP Specifies the new state for the processor for enabled,
	FALSE for disabled.
	@param[in] HealthFlag If not NULL, a pointer to a value that specifies the
	new health status of the AP. This flag corresponds to
	StatusFlag defined in EFI_PEI_MP_SERVICES_PPI.GetProcessorInfo().
	Only the PROCESSOR_HEALTH_STATUS_BIT is used. All other
	bits are ignored. If it is NULL, this parameter is
	ignored.

	@retval EFI_SUCCESS The specified AP was enabled or disabled successfully.
	@retval EFI_UNSUPPORTED Enabling or disabling an AP cannot be completed prior
	to this service returning.
	@retval EFI_UNSUPPORTED Enabling or disabling an AP is not supported.
	@retval EFI_DEVICE_ERROR The calling processor is an AP.
	@retval EFI_NOT_FOUND Processor with the handle specified by ProcessorNumber
	does not exist.
	@retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP.
	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PEI_MP_SERVICES_ENABLEDISABLEAP) (
	IN CONST EFI_PEI_SERVICES **PeiServices,
	IN EFI_PEI_MP_SERVICES_PPI *This,
	IN UINTN ProcessorNumber,
	IN BOOLEAN EnableAP,
	IN UINT32 *HealthFlag OPTIONAL
	);

	/**
	Identify the currently executing processor.

	@param[in] PeiServices An indirect pointer to the PEI Services Table
	published by the PEI Foundation.
	@param[in] This A pointer to the EFI_PEI_MP_SERVICES_PPI instance.
	@param[out] ProcessorNumber The handle number of the AP. The range is from 0 to the
	total number of logical processors minus 1. The total
	number of logical processors can be retrieved by
	EFI_PEI_MP_SERVICES_PPI.GetNumberOfProcessors().

	@retval EFI_SUCCESS The current processor handle number was returned in
	ProcessorNumber.
	@retval EFI_INVALID_PARAMETER ProcessorNumber is NULL.
	**/
	typedef
	EFI_STATUS
	(EFIAPI *EFI_PEI_MP_SERVICES_WHOAMI) (
	IN CONST EFI_PEI_SERVICES **PeiServices,
	IN EFI_PEI_MP_SERVICES_PPI *This,
	OUT UINTN *ProcessorNumber
	);

	///
	/// This PPI is installed by some platform or chipset-specific PEIM that abstracts
	/// handling multiprocessor support.
	///
	struct _EFI_PEI_MP_SERVICES_PPI {
	EFI_PEI_MP_SERVICES_GET_NUMBER_OF_PROCESSORS GetNumberOfProcessors;
	EFI_PEI_MP_SERVICES_GET_PROCESSOR_INFO GetProcessorInfo;
	EFI_PEI_MP_SERVICES_STARTUP_ALL_APS StartupAllAPs;
	EFI_PEI_MP_SERVICES_STARTUP_THIS_AP StartupThisAP;
	EFI_PEI_MP_SERVICES_SWITCH_BSP SwitchBSP;
	EFI_PEI_MP_SERVICES_ENABLEDISABLEAP EnableDisableAP;
	EFI_PEI_MP_SERVICES_WHOAMI WhoAmI;
	};

	extern EFI_GUID gEfiPeiMpServicesPpiGuid;

	#endif