Functions
EFI_STATUS EFIAPI	MpInitLibInitialize (VOID)

EFI_STATUS EFIAPI	MpInitLibGetNumberOfProcessors (OUT UINTN NumberOfProcessors, OUT UINTN NumberOfEnabledProcessors)

EFI_STATUS EFIAPI	MpInitLibGetProcessorInfo (IN UINTN ProcessorNumber, OUT EFI_PROCESSOR_INFORMATION ProcessorInfoBuffer, OUT EFI_HEALTH_FLAGS HealthData)

EFI_STATUS EFIAPI	MpInitLibStartupAllAPs (IN EFI_AP_PROCEDURE Procedure, IN BOOLEAN SingleThread, IN EFI_EVENT WaitEvent, IN UINTN TimeoutInMicroseconds, IN VOID ProcedureArgument, OUT UINTN *FailedCpuList)

EFI_STATUS EFIAPI	MpInitLibStartupThisAP (IN EFI_AP_PROCEDURE Procedure, IN UINTN ProcessorNumber, IN EFI_EVENT WaitEvent, IN UINTN TimeoutInMicroseconds, IN VOID ProcedureArgument, OUT BOOLEAN Finished)

EFI_STATUS EFIAPI	MpInitLibSwitchBSP (IN UINTN ProcessorNumber, IN BOOLEAN EnableOldBSP)

EFI_STATUS EFIAPI	MpInitLibEnableDisableAP (IN UINTN ProcessorNumber, IN BOOLEAN EnableAP, IN UINT32 *HealthFlag)

EFI_STATUS EFIAPI	MpInitLibWhoAmI (OUT UINTN *ProcessorNumber)

EFI_STATUS EFIAPI	MpInitLibStartupAllCPUs (IN EFI_AP_PROCEDURE Procedure, IN UINTN TimeoutInMicroseconds, IN VOID *ProcedureArgument)

Detailed Description

Multiple-Processor initialization Library.

Copyright (c) 2016 - 2019, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Function Documentation

EFI_STATUS EFIAPI MpInitLibEnableDisableAP	(	IN UINTN	ProcessorNumber,
		IN BOOLEAN	EnableAP,
		IN UINT32 *	HealthFlag
	)

This service lets the caller enable or disable an AP from this point onward. This service may only be called from the BSP.

Parameters

[in]	ProcessorNumber	The handle number of 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 MpInitLibGetNumberOfProcessors().
[in]	EnableAP	Specifies the new state for the processor for enabled, FALSE for disabled.
[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_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only the PROCESSOR_HEALTH_STATUS_BIT is used. All other bits are ignored. If it is NULL, this parameter is ignored.

Return values

EFI_SUCCESS	The specified AP was enabled or disabled successfully.
EFI_UNSUPPORTED	Enabling or disabling an AP cannot be completed prior to this service returning.
EFI_UNSUPPORTED	Enabling or disabling an AP is not supported.
EFI_DEVICE_ERROR	The calling processor is an AP.
EFI_NOT_FOUND	Processor with the handle specified by ProcessorNumber does not exist.
EFI_INVALID_PARAMETER	ProcessorNumber specifies the BSP.
EFI_NOT_READY	MP Initialize Library is not initialized.

EFI_STATUS EFIAPI MpInitLibGetNumberOfProcessors	(	OUT UINTN *	NumberOfProcessors,
		OUT UINTN *	NumberOfEnabledProcessors
	)

Retrieves the number of logical processor in the platform and the number of those logical processors that are enabled on this boot. This service may only be called from the BSP.

Parameters

[out]	NumberOfProcessors	Pointer to the total number of logical processors in the system, including the BSP and disabled APs.
[out]	NumberOfEnabledProcessors	Pointer to the number of enabled logical processors that exist in system, including the BSP.

Return values

EFI_SUCCESS	The number of logical processors and enabled logical processors was retrieved.
EFI_DEVICE_ERROR	The calling processor is an AP.
EFI_INVALID_PARAMETER	NumberOfProcessors is NULL and NumberOfEnabledProcessors is NULL.
EFI_NOT_READY	MP Initialize Library is not initialized.

EFI_STATUS EFIAPI MpInitLibGetProcessorInfo	(	IN UINTN	ProcessorNumber,
		OUT EFI_PROCESSOR_INFORMATION *	ProcessorInfoBuffer,
		OUT EFI_HEALTH_FLAGS *	HealthData
	)

Gets detailed MP-related information on the requested processor at the instant this call is made. This service may only be called from the BSP.

Parameters

[in]	ProcessorNumber	The handle number of processor.
[out]	ProcessorInfoBuffer	A pointer to the buffer where information for the requested processor is deposited.
[out]	HealthData	Return processor health data.

Return values

EFI_SUCCESS	Processor information was returned.
EFI_DEVICE_ERROR	The calling processor is an AP.
EFI_INVALID_PARAMETER	ProcessorInfoBuffer is NULL.
EFI_NOT_FOUND	The processor with the handle specified by ProcessorNumber does not exist in the platform.
EFI_NOT_READY	MP Initialize Library is not initialized.

EFI_STATUS EFIAPI MpInitLibInitialize ( VOID )

MP Initialize Library initialization.

This service will allocate AP reset vector and wakeup all APs to do APs initialization.

This service must be invoked before all other MP Initialize Library service are invoked.

Return values

EFI_SUCCESS	MP initialization succeeds.
Others	MP initialization fails.

EFI_STATUS EFIAPI MpInitLibStartupAllAPs	(	IN EFI_AP_PROCEDURE	Procedure,
		IN BOOLEAN	SingleThread,
		IN EFI_EVENT	WaitEvent,
		IN UINTN	TimeoutInMicroseconds,
		IN VOID *	ProcedureArgument,
		OUT UINTN **	FailedCpuList
	)

This service executes a caller provided function on all enabled APs.

Parameters

[in]	Procedure	A pointer to the function to be run on enabled APs of the system. See type EFI_AP_PROCEDURE.
[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.
[in]	WaitEvent	The event created by the caller with CreateEvent() service. If it is NULL, then execute in blocking mode. BSP waits until all APs finish or TimeoutInMicroSeconds expires. If it's not NULL, then execute in non-blocking mode. BSP requests the function specified by Procedure to be started on all the enabled APs, and go on executing immediately. If all return from Procedure, or TimeoutInMicroSeconds expires, this event is signaled. The BSP can use the CheckEvent() or WaitForEvent() services to check the state of event. Type EFI_EVENT is defined in CreateEvent() in the Unified Extensible Firmware Interface Specification.
[in]	TimeoutInMicroseconds	Indicates the time limit in microseconds for APs to return from Procedure, either for blocking or non-blocking mode. 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 MpInitLibStartupAllAPs() or MPInitLibStartupThisAP(). If the timeout expires in blocking mode, BSP returns EFI_TIMEOUT. If the timeout expires in non-blocking mode, WaitEvent is signaled with SignalEvent().
[in]	ProcedureArgument	The parameter passed into Procedure for all APs.
[out]	FailedCpuList	If NULL, this parameter is ignored. Otherwise, if all APs finish successfully, then its content is set to NULL. If not all APs finish before timeout expires, then its content is set to address of the buffer holding handle numbers of the failed APs. The buffer is allocated by MP Initialization library, and it's the caller's responsibility to free the buffer with FreePool() service. In blocking mode, it is ready for consumption when the call returns. In non-blocking mode, it is ready when WaitEvent is signaled. The list of failed CPU is terminated by END_OF_CPU_LIST.

Return values

EFI_SUCCESS	In blocking mode, all APs have finished before the timeout expired.
EFI_SUCCESS	In non-blocking mode, function has been dispatched to all enabled APs.
EFI_UNSUPPORTED	A non-blocking mode request was made after the UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was signaled.
EFI_UNSUPPORTED	WaitEvent is not NULL if non-blocking mode is not supported.
EFI_DEVICE_ERROR	Caller processor is AP.
EFI_NOT_STARTED	No enabled APs exist in the system.
EFI_NOT_READY	Any enabled APs are busy.
EFI_NOT_READY	MP Initialize Library is not initialized.
EFI_TIMEOUT	In blocking mode, the timeout expired before all enabled APs have finished.
EFI_INVALID_PARAMETER	Procedure is NULL.

EFI_STATUS EFIAPI MpInitLibStartupAllCPUs	(	IN EFI_AP_PROCEDURE	Procedure,
		IN UINTN	TimeoutInMicroseconds,
		IN VOID *	ProcedureArgument
	)

This service executes a caller provided function on all enabled CPUs.

Parameters

[in]	Procedure	A pointer to the function to be run on enabled APs of the system. See type EFI_AP_PROCEDURE.
[in]	TimeoutInMicroseconds	Indicates the time limit in microseconds for APs to return from Procedure, either for blocking or non-blocking mode. Zero means infinity. TimeoutInMicroseconds is ignored for BSP.
[in]	ProcedureArgument	The parameter passed into Procedure for all APs.

Return values

EFI_SUCCESS	In blocking mode, all CPUs have finished before the timeout expired.
EFI_SUCCESS	In non-blocking mode, function has been dispatched to all enabled CPUs.
EFI_DEVICE_ERROR	Caller processor is AP.
EFI_NOT_READY	Any enabled APs are busy.
EFI_NOT_READY	MP Initialize Library is not initialized.
EFI_TIMEOUT	In blocking mode, the timeout expired before all enabled APs have finished.
EFI_INVALID_PARAMETER	Procedure is NULL.

EFI_STATUS EFIAPI MpInitLibStartupThisAP	(	IN EFI_AP_PROCEDURE	Procedure,
		IN UINTN	ProcessorNumber,
		IN EFI_EVENT	WaitEvent,
		IN UINTN	TimeoutInMicroseconds,
		IN VOID *	ProcedureArgument,
		OUT BOOLEAN *	Finished
	)

This service lets the caller get one enabled AP to execute a caller-provided function.

Parameters

[in]	Procedure	A pointer to the function to be run on the designated AP of the system. See type EFI_AP_PROCEDURE.
[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 MpInitLibGetNumberOfProcessors().
[in]	WaitEvent	The event created by the caller with CreateEvent() service. If it is NULL, then execute in blocking mode. BSP waits until this AP finish or TimeoutInMicroSeconds expires. If it's not NULL, then execute in non-blocking mode. BSP requests the function specified by Procedure to be started on this AP, and go on executing immediately. If this AP return from Procedure or TimeoutInMicroSeconds expires, this event is signaled. The BSP can use the CheckEvent() or WaitForEvent() services to check the state of event. Type EFI_EVENT is defined in CreateEvent() in the Unified Extensible Firmware Interface Specification.
[in]	TimeoutInMicroseconds	Indicates the time limit in microseconds for this AP to finish this Procedure, either for blocking or non-blocking mode. Zero means infinity. If the timeout expires before this AP returns from Procedure, then Procedure on the AP is terminated. The AP is available for next function assigned by MpInitLibStartupAllAPs() or MpInitLibStartupThisAP(). If the timeout expires in blocking mode, BSP returns EFI_TIMEOUT. If the timeout expires in non-blocking mode, WaitEvent is signaled with SignalEvent().
[in]	ProcedureArgument	The parameter passed into Procedure on the specified AP.
[out]	Finished	If NULL, this parameter is ignored. In blocking mode, this parameter is ignored. In non-blocking mode, if AP returns from Procedure before the timeout expires, its content is set to TRUE. Otherwise, the value is set to FALSE. The caller can determine if the AP returned from Procedure by evaluating this value.

Return values

EFI_SUCCESS	In blocking mode, specified AP finished before the timeout expires.
EFI_SUCCESS	In non-blocking mode, the function has been dispatched to specified AP.
EFI_UNSUPPORTED	A non-blocking mode request was made after the UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was signaled.
EFI_UNSUPPORTED	WaitEvent is not NULL if non-blocking mode is not supported.
EFI_DEVICE_ERROR	The calling processor is an AP.
EFI_TIMEOUT	In blocking mode, the timeout expired before the specified AP has finished.
EFI_NOT_READY	The specified AP is busy.
EFI_NOT_READY	MP Initialize Library is not initialized.
EFI_NOT_FOUND	The processor with the handle specified by ProcessorNumber does not exist.
EFI_INVALID_PARAMETER	ProcessorNumber specifies the BSP or disabled AP.
EFI_INVALID_PARAMETER	Procedure is NULL.

EFI_STATUS EFIAPI MpInitLibSwitchBSP	(	IN UINTN	ProcessorNumber,
		IN BOOLEAN	EnableOldBSP
	)

This service switches the requested AP to be the BSP from that point onward. This service changes the BSP for all purposes. This call can only be performed by the current BSP.

Parameters

[in]	ProcessorNumber	The handle number of AP that is to become the new BSP. The range is from 0 to the total number of logical processors minus 1. The total number of logical processors can be retrieved by MpInitLibGetNumberOfProcessors().
[in]	EnableOldBSP	If TRUE, then the old BSP will be listed as an enabled AP. Otherwise, it will be disabled.

Return values

EFI_SUCCESS	BSP successfully switched.
EFI_UNSUPPORTED	Switching the BSP cannot be completed prior to this service returning.
EFI_UNSUPPORTED	Switching the BSP is not supported.
EFI_DEVICE_ERROR	The calling processor is an AP.
EFI_NOT_FOUND	The processor with the handle specified by ProcessorNumber does not exist.
EFI_INVALID_PARAMETER	ProcessorNumber specifies the current BSP or a disabled AP.
EFI_NOT_READY	The specified AP is busy.
EFI_NOT_READY	MP Initialize Library is not initialized.

EFI_STATUS EFIAPI MpInitLibWhoAmI ( OUT UINTN * ProcessorNumber )

This return the handle number for the calling processor. This service may be called from the BSP and APs.

Parameters

[out] ProcessorNumber Pointer to the handle number of 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 MpInitLibGetNumberOfProcessors().

Return values

EFI_SUCCESS	The current processor handle number was returned in ProcessorNumber.
EFI_INVALID_PARAMETER	ProcessorNumber is NULL.
EFI_NOT_READY	MP Initialize Library is not initialized.

Functions

Detailed Description

Function Documentation