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| typedef VOID * | MM_COMPLETION |
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| typedef struct _EFI_MM_MP_PROTOCOL | EFI_MM_MP_PROTOCOL |
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| typedef EFI_STATUS(EFIAPI * | EFI_MM_GET_NUMBER_OF_PROCESSORS) (IN CONST EFI_MM_MP_PROTOCOL *This, OUT UINTN *NumberOfProcessors) |
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| typedef EFI_STATUS(EFIAPI * | EFI_MM_DISPATCH_PROCEDURE) (IN CONST EFI_MM_MP_PROTOCOL *This, IN EFI_AP_PROCEDURE2 Procedure, IN UINTN CpuNumber, IN UINTN TimeoutInMicroseconds, IN OUT VOID *ProcedureArguments OPTIONAL, IN OUT MM_COMPLETION *Token, IN OUT EFI_STATUS *CPUStatus) |
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| typedef EFI_STATUS(EFIAPI * | EFI_MM_BROADCAST_PROCEDURE) (IN CONST EFI_MM_MP_PROTOCOL *This, IN EFI_AP_PROCEDURE2 Procedure, IN UINTN TimeoutInMicroseconds, IN OUT VOID *ProcedureArguments OPTIONAL, IN OUT MM_COMPLETION *Token, IN OUT EFI_STATUS *CPUStatus) |
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| typedef EFI_STATUS(EFIAPI * | EFI_MM_SET_STARTUP_PROCEDURE) (IN CONST EFI_MM_MP_PROTOCOL *This, IN EFI_AP_PROCEDURE Procedure, IN OUT VOID *ProcedureArguments OPTIONAL) |
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| typedef EFI_STATUS(EFIAPI * | EFI_CHECK_FOR_PROCEDURE) (IN CONST EFI_MM_MP_PROTOCOL *This, IN MM_COMPLETION Token) |
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| typedef EFI_STATUS(EFIAPI * | EFI_WAIT_FOR_PROCEDURE) (IN CONST EFI_MM_MP_PROTOCOL *This, IN MM_COMPLETION Token) |
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EFI MM MP Protocol is defined in the PI 1.5 specification.
The MM MP protocol provides a set of functions to allow execution of procedures on processors that have entered MM. This protocol has the following properties:
- The caller can only invoke execution of a procedure on a processor, other than the caller, that has also entered MM.
- It is possible to invoke a procedure on multiple processors. Supports blocking and non-blocking modes of operation.
Copyright (c) 2019, Intel Corporation. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent
Definition in file MmMp.h.
When non-blocking execution of a procedure on an AP is invoked with DispatchProcedure, via the use of a token, this function can be used to check for completion of the procedure on the AP. The function takes the token that was passed into the DispatchProcedure call. If the procedure is complete, and therefore it is now possible to run another procedure on the same AP, this function returns EFI_SUCESS. In this case the status returned by the procedure that executed on the AP is returned in the token's Status field. If the procedure has not yet completed, then this function returns EFI_NOT_READY.
When a non-blocking execution of a procedure is invoked with BroadcastProcedure, via the use of a token, this function can be used to check for completion of the procedure on all the broadcast APs. The function takes the token that was passed into the BroadcastProcedure call. If the procedure is complete on all broadcast APs this function returns EFI_SUCESS. In this case the Status field in the token passed into the function reflects the overall result of the invocation, which may be EFI_SUCCESS, if all executions succeeded, or the first observed failure. If the procedure has not yet completed on the broadcast APs, the function returns EFI_NOT_READY.
- Parameters
-
| [in] | This | The EFI_MM_MP_PROTOCOL instance. |
| [in] | Token | This parameter describes the token that was passed into DispatchProcedure or BroadcastProcedure. |
- Return values
-
| EFI_SUCCESS | Procedure has completed. |
| EFI_NOT_READY | The Procedure has not completed. |
| EFI_INVALID_PARAMETER | Token or Token->Completion is NULL |
| EFI_NOT_FOUND | Token is not currently in use for a non-blocking call |
Definition at line 274 of file MmMp.h.
This service allows the caller to invoke a procedure on all running application processors (AP) except the caller. This function uses an optional token parameter to support blocking and nonblocking modes. If the token is passed into the call, the function will operate in a non-blocking fashion and the caller can check for completion with CheckOnProcedure or WaitForProcedure.
It is not necessary for the implementation to run the procedure on every processor on the platform. Processors that are powered down in such a way that they cannot respond to interrupts, may be excluded from the broadcast.
- Parameters
-
| [in] | This | The EFI_MM_MP_PROTOCOL instance. |
| [in] | Procedure | A pointer to the code stream to be run on the APs that have entered MM. Type EFI_AP_PROCEDURE is defined below in related definitions. |
| [in] | TimeoutInMicroseconds | Indicates the time limit in microseconds for the APs to finish execution of 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. If the timeout expires in blocking mode, the call returns EFI_TIMEOUT. If the timeout expires in non-blocking mode, the timeout determined can be through CheckOnProcedure or WaitForProcedure. Note that timeout support is optional. Whether an implementation supports this feature can be determined via the Attributes data member. |
| [in,out] | ProcedureArguments | Allows the caller to pass a list of parameters to the code that is run by the AP. It is an optional common mailbox between APs and the caller to share information. |
| [in,out] | Token | This is parameter is broken into two components: 1.Token->Completion is an optional parameter that allows the caller to execute the procedure in a blocking or non-blocking fashion. If it is NULL the call is blocking, and the call will not return until the AP has completed the procedure. If the token is not NULL, the call will return immediately. The caller can check whether the procedure has completed with CheckOnProcedure or WaitForProcedure. 2.Token->Status The implementation updates the address pointed at by this variable with the status code returned by Procedure when it completes execution on the target AP, or with EFI_TIMEOUT if the Procedure fails to complete within the optional timeout. The implementation will update this variable with EFI_NOT_READY prior to starting Procedure on the target AP |
| [in,out] | CPUStatus | This optional pointer may be used to get the individual status returned by every AP that participated in the broadcast. This parameter if used provides the base address of an array to hold the EFI_STATUS value of each AP in the system. The size of the array can be ascertained by the GetNumberOfProcessors function. As mentioned above, the broadcast may not include every processor in the system. Some implementations may exclude processors that have been powered down in such a way that they are not responsive to interrupts. Additionally the broadcast excludes the processor which is making the BroadcastProcedure call. For every excluded processor, the array entry must contain a value of EFI_NOT_STARTED |
- Return values
-
| EFI_SUCCESS | In the blocking case, this indicates that Procedure has completed execution on the APs. In the non-blocking case this indicates that the procedure has been successfully scheduled for execution on the APs. |
| EFI_INVALID_PARAMETER | Procedure or Token is NULL. |
| EFI_NOT_READY | If a target AP is busy executing another procedure. |
| EFI_TIMEOUT | In blocking mode, the timeout expired before all enabled APs have finished. |
| EFI_ALREADY_STARTED | Before the AP procedure associated with the Token is finished, the same Token cannot be used to dispatch or broadcast another procedure. |
Definition at line 203 of file MmMp.h.
When a non-blocking execution of a procedure on an AP is invoked via DispatchProcedure, this function will block the caller until the remote procedure has completed on the designated AP. The non-blocking procedure invocation is identified by the Token parameter, which must match the token that used when DispatchProcedure was called. Upon completion the status returned by the procedure that executed on the AP is used to update the token's Status field.
When a non-blocking execution of a procedure on an AP is invoked via BroadcastProcedure this function will block the caller until the remote procedure has completed on all of the APs that entered MM. The non-blocking procedure invocation is identified by the Token parameter, which must match the token that used when BroadcastProcedure was called. Upon completion the overall status returned by the procedures that executed on the broadcast AP is used to update the token's Status field. The overall status may be EFI_SUCCESS, if all executions succeeded, or the first observed failure.
- Parameters
-
| [in] | This | The EFI_MM_MP_PROTOCOL instance. |
| [in] | Token | This parameter describes the token that was passed into DispatchProcedure or BroadcastProcedure. |
- Return values
-
| EFI_SUCCESS | Procedure has completed. |
| EFI_INVALID_PARAMETER | Token or Token->Completion is NULL |
| EFI_NOT_FOUND | Token is not currently in use for a non-blocking call |
Definition at line 306 of file MmMp.h.
1.9.6