/** @file\r
CPU DXE MP support\r
\r
- Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>\r
- This program and the accompanying materials\r
- are licensed and made available under the terms and conditions of the BSD License\r
- which accompanies this distribution. The full text of the license may be found at\r
- http://opensource.org/licenses/bsd-license.php\r
-\r
- THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
- WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+ Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
+ SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
VOID\r
);\r
\r
-typedef\r
-VOID\r
-(EFIAPI *STACKLESS_AP_ENTRY_POINT)(\r
- VOID\r
+/**\r
+ This service retrieves the number of logical processor in the platform\r
+ and the number of those logical processors that are enabled on this boot.\r
+ This service may only be called from the BSP.\r
+\r
+ This function is used to retrieve the following information:\r
+ - The number of logical processors that are present in the system.\r
+ - The number of enabled logical processors in the system at the instant\r
+ this call is made.\r
+\r
+ Because MP Service Protocol provides services to enable and disable processors\r
+ dynamically, the number of enabled logical processors may vary during the\r
+ course of a boot session.\r
+\r
+ If this service is called from an AP, then EFI_DEVICE_ERROR is returned.\r
+ If NumberOfProcessors or NumberOfEnabledProcessors is NULL, then\r
+ EFI_INVALID_PARAMETER is returned. Otherwise, the total number of processors\r
+ is returned in NumberOfProcessors, the number of currently enabled processor\r
+ is returned in NumberOfEnabledProcessors, and EFI_SUCCESS is returned.\r
+\r
+ @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r
+ instance.\r
+ @param[out] NumberOfProcessors Pointer to the total number of logical\r
+ processors in the system, including the BSP\r
+ and disabled APs.\r
+ @param[out] NumberOfEnabledProcessors Pointer to the number of enabled logical\r
+ processors that exist in system, including\r
+ the BSP.\r
+\r
+ @retval EFI_SUCCESS The number of logical processors and enabled\r
+ logical processors was retrieved.\r
+ @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
+ @retval EFI_INVALID_PARAMETER NumberOfProcessors is NULL.\r
+ @retval EFI_INVALID_PARAMETER NumberOfEnabledProcessors is NULL.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+GetNumberOfProcessors (\r
+ IN EFI_MP_SERVICES_PROTOCOL *This,\r
+ OUT UINTN *NumberOfProcessors,\r
+ OUT UINTN *NumberOfEnabledProcessors\r
);\r
\r
/**\r
- Starts the Application Processors and directs them to jump to the\r
- specified routine.\r
+ Gets detailed MP-related information on the requested processor at the\r
+ instant this call is made. This service may only be called from the BSP.\r
\r
- The processor jumps to this code in flat mode, but the processor's\r
- stack is not initialized.\r
+ This service retrieves detailed MP-related information about any processor\r
+ on the platform. Note the following:\r
+ - The processor information may change during the course of a boot session.\r
+ - The information presented here is entirely MP related.\r
\r
- @param ApEntryPoint Pointer to the Entry Point routine\r
+ Information regarding the number of caches and their sizes, frequency of operation,\r
+ slot numbers is all considered platform-related information and is not provided\r
+ by this service.\r
\r
- @retval EFI_SUCCESS The APs were started\r
- @retval EFI_OUT_OF_RESOURCES Cannot allocate memory to start APs\r
+ @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r
+ instance.\r
+ @param[in] ProcessorNumber The handle number of processor.\r
+ @param[out] ProcessorInfoBuffer A pointer to the buffer where information for\r
+ the requested processor is deposited.\r
+\r
+ @retval EFI_SUCCESS Processor information was returned.\r
+ @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
+ @retval EFI_INVALID_PARAMETER ProcessorInfoBuffer is NULL.\r
+ @retval EFI_NOT_FOUND The processor with the handle specified by\r
+ ProcessorNumber does not exist in the platform.\r
\r
**/\r
EFI_STATUS\r
-StartApsStackless (\r
- IN STACKLESS_AP_ENTRY_POINT ApEntryPoint\r
+EFIAPI\r
+GetProcessorInfo (\r
+ IN EFI_MP_SERVICES_PROTOCOL *This,\r
+ IN UINTN ProcessorNumber,\r
+ OUT EFI_PROCESSOR_INFORMATION *ProcessorInfoBuffer\r
);\r
\r
/**\r
- The AP entry point that the Startup-IPI target code will jump to.\r
+ This service executes a caller provided function on all enabled APs. APs can\r
+ run either simultaneously or one at a time in sequence. This service supports\r
+ both blocking and non-blocking requests. The non-blocking requests use EFI\r
+ events so the BSP can detect when the APs have finished. This service may only\r
+ be called from the BSP.\r
+\r
+ This function is used to dispatch all the enabled APs to the function specified\r
+ by Procedure. If any enabled AP is busy, then EFI_NOT_READY is returned\r
+ immediately and Procedure is not started on any AP.\r
+\r
+ If SingleThread is TRUE, all the enabled APs execute the function specified by\r
+ Procedure one by one, in ascending order of processor handle number. Otherwise,\r
+ all the enabled APs execute the function specified by Procedure simultaneously.\r
\r
- The processor jumps to this code in flat mode, but the processor's\r
- stack is not initialized.\r
+ If WaitEvent is NULL, execution is in blocking mode. The BSP waits until all\r
+ APs finish or TimeoutInMicroseconds expires. Otherwise, execution is in non-blocking\r
+ mode, and the BSP returns from this service without waiting for APs. If a\r
+ non-blocking mode is requested after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT\r
+ is signaled, then EFI_UNSUPPORTED must be returned.\r
+\r
+ If the timeout specified by TimeoutInMicroseconds expires before all APs return\r
+ from Procedure, then Procedure on the failed APs is terminated. All enabled APs\r
+ are always available for further calls to EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()\r
+ and EFI_MP_SERVICES_PROTOCOL.StartupThisAP(). If FailedCpuList is not NULL, its\r
+ content points to the list of processor handle numbers in which Procedure was\r
+ terminated.\r
+\r
+ Note: It is the responsibility of the consumer of the EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()\r
+ to make sure that the nature of the code that is executed on the BSP and the\r
+ dispatched APs is well controlled. The MP Services Protocol does not guarantee\r
+ that the Procedure function is MP-safe. Hence, the tasks that can be run in\r
+ parallel are limited to certain independent tasks and well-controlled exclusive\r
+ code. EFI services and protocols may not be called by APs unless otherwise\r
+ specified.\r
+\r
+ In blocking execution mode, BSP waits until all APs finish or\r
+ TimeoutInMicroseconds expires.\r
+\r
+ In non-blocking execution mode, BSP is freed to return to the caller and then\r
+ proceed to the next task without having to wait for APs. The following\r
+ sequence needs to occur in a non-blocking execution mode:\r
+\r
+ -# The caller that intends to use this MP Services Protocol in non-blocking\r
+ mode creates WaitEvent by calling the EFI CreateEvent() service. The caller\r
+ invokes EFI_MP_SERVICES_PROTOCOL.StartupAllAPs(). If the parameter WaitEvent\r
+ is not NULL, then StartupAllAPs() executes in non-blocking mode. It requests\r
+ the function specified by Procedure to be started on all the enabled APs,\r
+ and releases the BSP to continue with other tasks.\r
+ -# The caller can use the CheckEvent() and WaitForEvent() services to check\r
+ the state of the WaitEvent created in step 1.\r
+ -# When the APs complete their task or TimeoutInMicroSeconds expires, the MP\r
+ Service signals WaitEvent by calling the EFI SignalEvent() function. If\r
+ FailedCpuList is not NULL, its content is available when WaitEvent is\r
+ signaled. If all APs returned from Procedure prior to the timeout, then\r
+ FailedCpuList is set to NULL. If not all APs return from Procedure before\r
+ the timeout, then FailedCpuList is filled in with the list of the failed\r
+ APs. The buffer is allocated by MP Service Protocol using AllocatePool().\r
+ It is the caller's responsibility to free the buffer with FreePool() service.\r
+ -# This invocation of SignalEvent() function informs the caller that invoked\r
+ EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() that either all the APs completed\r
+ the specified task or a timeout occurred. The contents of FailedCpuList\r
+ can be examined to determine which APs did not complete the specified task\r
+ prior to the timeout.\r
+\r
+ @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r
+ instance.\r
+ @param[in] Procedure A pointer to the function to be run on\r
+ enabled APs of the system. See type\r
+ EFI_AP_PROCEDURE.\r
+ @param[in] SingleThread If TRUE, then all the enabled APs execute\r
+ the function specified by Procedure one by\r
+ one, in ascending order of processor handle\r
+ number. If FALSE, then all the enabled APs\r
+ execute the function specified by Procedure\r
+ simultaneously.\r
+ @param[in] WaitEvent The event created by the caller with CreateEvent()\r
+ service. If it is NULL, then execute in\r
+ blocking mode. BSP waits until all APs finish\r
+ or TimeoutInMicroseconds expires. If it's\r
+ not NULL, then execute in non-blocking mode.\r
+ BSP requests the function specified by\r
+ Procedure to be started on all the enabled\r
+ APs, and go on executing immediately. If\r
+ all return from Procedure, or TimeoutInMicroseconds\r
+ expires, this event is signaled. The BSP\r
+ can use the CheckEvent() or WaitForEvent()\r
+ services to check the state of event. Type\r
+ EFI_EVENT is defined in CreateEvent() in\r
+ the Unified Extensible Firmware Interface\r
+ Specification.\r
+ @param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for\r
+ APs to return from Procedure, either for\r
+ blocking or non-blocking mode. Zero means\r
+ infinity. If the timeout expires before\r
+ all APs return from Procedure, then Procedure\r
+ on the failed APs is terminated. All enabled\r
+ APs are available for next function assigned\r
+ by EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()\r
+ or EFI_MP_SERVICES_PROTOCOL.StartupThisAP().\r
+ If the timeout expires in blocking mode,\r
+ BSP returns EFI_TIMEOUT. If the timeout\r
+ expires in non-blocking mode, WaitEvent\r
+ is signaled with SignalEvent().\r
+ @param[in] ProcedureArgument The parameter passed into Procedure for\r
+ all APs.\r
+ @param[out] FailedCpuList If NULL, this parameter is ignored. Otherwise,\r
+ if all APs finish successfully, then its\r
+ content is set to NULL. If not all APs\r
+ finish before timeout expires, then its\r
+ content is set to address of the buffer\r
+ holding handle numbers of the failed APs.\r
+ The buffer is allocated by MP Service Protocol,\r
+ and it's the caller's responsibility to\r
+ free the buffer with FreePool() service.\r
+ In blocking mode, it is ready for consumption\r
+ when the call returns. In non-blocking mode,\r
+ it is ready when WaitEvent is signaled. The\r
+ list of failed CPU is terminated by\r
+ END_OF_CPU_LIST.\r
+\r
+ @retval EFI_SUCCESS In blocking mode, all APs have finished before\r
+ the timeout expired.\r
+ @retval EFI_SUCCESS In non-blocking mode, function has been dispatched\r
+ to all enabled APs.\r
+ @retval EFI_UNSUPPORTED A non-blocking mode request was made after the\r
+ UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was\r
+ signaled.\r
+ @retval EFI_DEVICE_ERROR Caller processor is AP.\r
+ @retval EFI_NOT_STARTED No enabled APs exist in the system.\r
+ @retval EFI_NOT_READY Any enabled APs are busy.\r
+ @retval EFI_TIMEOUT In blocking mode, the timeout expired before\r
+ all enabled APs have finished.\r
+ @retval EFI_INVALID_PARAMETER Procedure is NULL.\r
\r
**/\r
-VOID\r
+EFI_STATUS\r
EFIAPI\r
-AsmApEntryPoint (\r
- VOID\r
+StartupAllAPs (\r
+ IN EFI_MP_SERVICES_PROTOCOL *This,\r
+ IN EFI_AP_PROCEDURE Procedure,\r
+ IN BOOLEAN SingleThread,\r
+ IN EFI_EVENT WaitEvent OPTIONAL,\r
+ IN UINTN TimeoutInMicroseconds,\r
+ IN VOID *ProcedureArgument OPTIONAL,\r
+ OUT UINTN **FailedCpuList OPTIONAL\r
);\r
\r
/**\r
- Releases the lock preventing other APs from using the shared AP\r
- stack.\r
+ This service lets the caller get one enabled AP to execute a caller-provided\r
+ function. The caller can request the BSP to either wait for the completion\r
+ of the AP or just proceed with the next task by using the EFI event mechanism.\r
+ See EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() for more details on non-blocking\r
+ execution support. This service may only be called from the BSP.\r
+\r
+ This function is used to dispatch one enabled AP to the function specified by\r
+ Procedure passing in the argument specified by ProcedureArgument. If WaitEvent\r
+ is NULL, execution is in blocking mode. The BSP waits until the AP finishes or\r
+ TimeoutInMicroSeconds expires. Otherwise, execution is in non-blocking mode.\r
+ BSP proceeds to the next task without waiting for the AP. If a non-blocking mode\r
+ is requested after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT is signaled,\r
+ then EFI_UNSUPPORTED must be returned.\r
+\r
+ If the timeout specified by TimeoutInMicroseconds expires before the AP returns\r
+ from Procedure, then execution of Procedure by the AP is terminated. The AP is\r
+ available for subsequent calls to EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() and\r
+ EFI_MP_SERVICES_PROTOCOL.StartupThisAP().\r
\r
- Once the AP has transitioned to using a new stack, it can call this\r
- function to allow another AP to proceed with using the shared stack.\r
+ @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL\r
+ instance.\r
+ @param[in] Procedure A pointer to the function to be run on\r
+ enabled APs of the system. See type\r
+ EFI_AP_PROCEDURE.\r
+ @param[in] ProcessorNumber The handle number of the AP. The range is\r
+ from 0 to the total number of logical\r
+ processors minus 1. The total number of\r
+ logical processors can be retrieved by\r
+ EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r
+ @param[in] WaitEvent The event created by the caller with CreateEvent()\r
+ service. If it is NULL, then execute in\r
+ blocking mode. BSP waits until all APs finish\r
+ or TimeoutInMicroseconds expires. If it's\r
+ not NULL, then execute in non-blocking mode.\r
+ BSP requests the function specified by\r
+ Procedure to be started on all the enabled\r
+ APs, and go on executing immediately. If\r
+ all return from Procedure or TimeoutInMicroseconds\r
+ expires, this event is signaled. The BSP\r
+ can use the CheckEvent() or WaitForEvent()\r
+ services to check the state of event. Type\r
+ EFI_EVENT is defined in CreateEvent() in\r
+ the Unified Extensible Firmware Interface\r
+ Specification.\r
+ @param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for\r
+ APs to return from Procedure, either for\r
+ blocking or non-blocking mode. Zero means\r
+ infinity. If the timeout expires before\r
+ all APs return from Procedure, then Procedure\r
+ on the failed APs is terminated. All enabled\r
+ APs are available for next function assigned\r
+ by EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()\r
+ or EFI_MP_SERVICES_PROTOCOL.StartupThisAP().\r
+ If the timeout expires in blocking mode,\r
+ BSP returns EFI_TIMEOUT. If the timeout\r
+ expires in non-blocking mode, WaitEvent\r
+ is signaled with SignalEvent().\r
+ @param[in] ProcedureArgument The parameter passed into Procedure for\r
+ all APs.\r
+ @param[out] Finished If NULL, this parameter is ignored. In\r
+ blocking mode, this parameter is ignored.\r
+ In non-blocking mode, if AP returns from\r
+ Procedure before the timeout expires, its\r
+ content is set to TRUE. Otherwise, the\r
+ value is set to FALSE. The caller can\r
+ determine if the AP returned from Procedure\r
+ by evaluating this value.\r
+\r
+ @retval EFI_SUCCESS In blocking mode, specified AP finished before\r
+ the timeout expires.\r
+ @retval EFI_SUCCESS In non-blocking mode, the function has been\r
+ dispatched to specified AP.\r
+ @retval EFI_UNSUPPORTED A non-blocking mode request was made after the\r
+ UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was\r
+ signaled.\r
+ @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
+ @retval EFI_TIMEOUT In blocking mode, the timeout expired before\r
+ the specified AP has finished.\r
+ @retval EFI_NOT_READY The specified AP is busy.\r
+ @retval EFI_NOT_FOUND The processor with the handle specified by\r
+ ProcessorNumber does not exist.\r
+ @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP or disabled AP.\r
+ @retval EFI_INVALID_PARAMETER Procedure is NULL.\r
\r
**/\r
-VOID\r
+EFI_STATUS\r
EFIAPI\r
-AsmApDoneWithCommonStack (\r
- VOID\r
+StartupThisAP (\r
+ IN EFI_MP_SERVICES_PROTOCOL *This,\r
+ IN EFI_AP_PROCEDURE Procedure,\r
+ IN UINTN ProcessorNumber,\r
+ IN EFI_EVENT WaitEvent OPTIONAL,\r
+ IN UINTN TimeoutInMicroseconds,\r
+ IN VOID *ProcedureArgument OPTIONAL,\r
+ OUT BOOLEAN *Finished OPTIONAL\r
);\r
\r
-#endif // _CPU_MP_H_\r
+/**\r
+ This service switches the requested AP to be the BSP from that point onward.\r
+ This service changes the BSP for all purposes. This call can only be performed\r
+ by the current BSP.\r
+\r
+ This service switches the requested AP to be the BSP from that point onward.\r
+ This service changes the BSP for all purposes. The new BSP can take over the\r
+ execution of the old BSP and continue seamlessly from where the old one left\r
+ off. This service may not be supported after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT\r
+ is signaled.\r
+\r
+ If the BSP cannot be switched prior to the return from this service, then\r
+ EFI_UNSUPPORTED must be returned.\r
+\r
+ @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.\r
+ @param[in] ProcessorNumber The handle number of AP that is to become the new\r
+ BSP. The range is from 0 to the total number of\r
+ logical processors minus 1. The total number of\r
+ logical processors can be retrieved by\r
+ EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r
+ @param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an\r
+ enabled AP. Otherwise, it will be disabled.\r
+\r
+ @retval EFI_SUCCESS BSP successfully switched.\r
+ @retval EFI_UNSUPPORTED Switching the BSP cannot be completed prior to\r
+ this service returning.\r
+ @retval EFI_UNSUPPORTED Switching the BSP is not supported.\r
+ @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
+ @retval EFI_NOT_FOUND The processor with the handle specified by\r
+ ProcessorNumber does not exist.\r
+ @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the current BSP or\r
+ a disabled AP.\r
+ @retval EFI_NOT_READY The specified AP is busy.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+SwitchBSP (\r
+ IN EFI_MP_SERVICES_PROTOCOL *This,\r
+ IN UINTN ProcessorNumber,\r
+ IN BOOLEAN EnableOldBSP\r
+ );\r
+\r
+/**\r
+ This service lets the caller enable or disable an AP from this point onward.\r
+ This service may only be called from the BSP.\r
+\r
+ This service allows the caller enable or disable an AP from this point onward.\r
+ The caller can optionally specify the health status of the AP by Health. If\r
+ an AP is being disabled, then the state of the disabled AP is implementation\r
+ dependent. If an AP is enabled, then the implementation must guarantee that a\r
+ complete initialization sequence is performed on the AP, so the AP is in a state\r
+ that is compatible with an MP operating system. This service may not be supported\r
+ after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT is signaled.\r
+\r
+ If the enable or disable AP operation cannot be completed prior to the return\r
+ from this service, then EFI_UNSUPPORTED must be returned.\r
+\r
+ @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.\r
+ @param[in] ProcessorNumber The handle number of AP that is to become the new\r
+ BSP. The range is from 0 to the total number of\r
+ logical processors minus 1. The total number of\r
+ logical processors can be retrieved by\r
+ EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r
+ @param[in] EnableAP Specifies the new state for the processor for\r
+ enabled, FALSE for disabled.\r
+ @param[in] HealthFlag If not NULL, a pointer to a value that specifies\r
+ the new health status of the AP. This flag\r
+ corresponds to StatusFlag defined in\r
+ EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only\r
+ the PROCESSOR_HEALTH_STATUS_BIT is used. All other\r
+ bits are ignored. If it is NULL, this parameter\r
+ is ignored.\r
+\r
+ @retval EFI_SUCCESS The specified AP was enabled or disabled successfully.\r
+ @retval EFI_UNSUPPORTED Enabling or disabling an AP cannot be completed\r
+ prior to this service returning.\r
+ @retval EFI_UNSUPPORTED Enabling or disabling an AP is not supported.\r
+ @retval EFI_DEVICE_ERROR The calling processor is an AP.\r
+ @retval EFI_NOT_FOUND Processor with the handle specified by ProcessorNumber\r
+ does not exist.\r
+ @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP.\r
\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+EnableDisableAP (\r
+ IN EFI_MP_SERVICES_PROTOCOL *This,\r
+ IN UINTN ProcessorNumber,\r
+ IN BOOLEAN EnableAP,\r
+ IN UINT32 *HealthFlag OPTIONAL\r
+ );\r
+\r
+/**\r
+ This return the handle number for the calling processor. This service may be\r
+ called from the BSP and APs.\r
+\r
+ This service returns the processor handle number for the calling processor.\r
+ The returned value is in the range from 0 to the total number of logical\r
+ processors minus 1. The total number of logical processors can be retrieved\r
+ with EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors(). This service may be\r
+ called from the BSP and APs. If ProcessorNumber is NULL, then EFI_INVALID_PARAMETER\r
+ is returned. Otherwise, the current processors handle number is returned in\r
+ ProcessorNumber, and EFI_SUCCESS is returned.\r
+\r
+ @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.\r
+ @param[out] ProcessorNumber The handle number of AP that is to become the new\r
+ BSP. The range is from 0 to the total number of\r
+ logical processors minus 1. The total number of\r
+ logical processors can be retrieved by\r
+ EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().\r
+\r
+ @retval EFI_SUCCESS The current processor handle number was returned\r
+ in ProcessorNumber.\r
+ @retval EFI_INVALID_PARAMETER ProcessorNumber is NULL.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+WhoAmI (\r
+ IN EFI_MP_SERVICES_PROTOCOL *This,\r
+ OUT UINTN *ProcessorNumber\r
+ );\r
+\r
+#endif // _CPU_MP_H_\r