2 MP initialize support functions for DXE phase.
4 Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
5 This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
17 #include <Library/UefiLib.h>
18 #include <Library/UefiBootServicesTableLib.h>
19 #include <Library/DebugAgentLib.h>
20 #include <Library/DxeServicesTableLib.h>
22 #include <Protocol/Timer.h>
24 #define AP_CHECK_INTERVAL (EFI_TIMER_PERIOD_MILLISECONDS (100))
25 #define AP_SAFE_STACK_SIZE 128
27 CPU_MP_DATA
*mCpuMpData
= NULL
;
28 EFI_EVENT mCheckAllApsEvent
= NULL
;
29 EFI_EVENT mMpInitExitBootServicesEvent
= NULL
;
30 EFI_EVENT mLegacyBootEvent
= NULL
;
31 volatile BOOLEAN mStopCheckAllApsStatus
= TRUE
;
32 VOID
*mReservedApLoopFunc
= NULL
;
33 UINTN mReservedTopOfApStack
;
34 volatile UINT32 mNumberToFinish
= 0;
37 Enable Debug Agent to support source debugging on AP function.
46 // Initialize Debug Agent to support source level debug in DXE phase
48 InitializeDebugAgent (DEBUG_AGENT_INIT_DXE_AP
, NULL
, NULL
);
52 Get the pointer to CPU MP Data structure.
54 @return The pointer to CPU MP Data structure.
61 ASSERT (mCpuMpData
!= NULL
);
66 Save the pointer to CPU MP Data structure.
68 @param[in] CpuMpData The pointer to CPU MP Data structure will be saved.
72 IN CPU_MP_DATA
*CpuMpData
75 mCpuMpData
= CpuMpData
;
79 Get available system memory below 1MB by specified size.
81 @param[in] WakeupBufferSize Wakeup buffer size required
83 @retval other Return wakeup buffer address below 1MB.
84 @retval -1 Cannot find free memory below 1MB.
88 IN UINTN WakeupBufferSize
92 EFI_PHYSICAL_ADDRESS StartAddress
;
94 StartAddress
= BASE_1MB
;
95 Status
= gBS
->AllocatePages (
98 EFI_SIZE_TO_PAGES (WakeupBufferSize
),
101 ASSERT_EFI_ERROR (Status
);
102 if (!EFI_ERROR (Status
)) {
103 Status
= gBS
->FreePages(
105 EFI_SIZE_TO_PAGES (WakeupBufferSize
)
107 ASSERT_EFI_ERROR (Status
);
108 DEBUG ((DEBUG_INFO
, "WakeupBufferStart = %x, WakeupBufferSize = %x\n",
109 (UINTN
) StartAddress
, WakeupBufferSize
));
111 StartAddress
= (EFI_PHYSICAL_ADDRESS
) -1;
113 return (UINTN
) StartAddress
;
117 Get available EfiBootServicesCode memory below 4GB by specified size.
119 This buffer is required to safely transfer AP from real address mode to
120 protected mode or long mode, due to the fact that the buffer returned by
121 GetWakeupBuffer() may be marked as non-executable.
123 @param[in] BufferSize Wakeup transition buffer size.
125 @retval other Return wakeup transition buffer address below 4GB.
126 @retval 0 Cannot find free memory below 4GB.
129 GetModeTransitionBuffer (
134 EFI_PHYSICAL_ADDRESS StartAddress
;
136 StartAddress
= BASE_4GB
- 1;
137 Status
= gBS
->AllocatePages (
140 EFI_SIZE_TO_PAGES (BufferSize
),
143 if (EFI_ERROR (Status
)) {
147 return (UINTN
)StartAddress
;
151 Checks APs status and updates APs status if needed.
155 CheckAndUpdateApsStatus (
159 UINTN ProcessorNumber
;
161 CPU_MP_DATA
*CpuMpData
;
163 CpuMpData
= GetCpuMpData ();
166 // First, check whether pending StartupAllAPs() exists.
168 if (CpuMpData
->WaitEvent
!= NULL
) {
170 Status
= CheckAllAPs ();
172 // If all APs finish for StartupAllAPs(), signal the WaitEvent for it.
174 if (Status
!= EFI_NOT_READY
) {
175 Status
= gBS
->SignalEvent (CpuMpData
->WaitEvent
);
176 CpuMpData
->WaitEvent
= NULL
;
181 // Second, check whether pending StartupThisAPs() callings exist.
183 for (ProcessorNumber
= 0; ProcessorNumber
< CpuMpData
->CpuCount
; ProcessorNumber
++) {
185 if (CpuMpData
->CpuData
[ProcessorNumber
].WaitEvent
== NULL
) {
189 Status
= CheckThisAP (ProcessorNumber
);
191 if (Status
!= EFI_NOT_READY
) {
192 gBS
->SignalEvent (CpuMpData
->CpuData
[ProcessorNumber
].WaitEvent
);
193 CpuMpData
->CpuData
[ProcessorNumber
].WaitEvent
= NULL
;
199 Checks APs' status periodically.
201 This function is triggered by timer periodically to check the
202 state of APs for StartupAllAPs() and StartupThisAP() executed
203 in non-blocking mode.
205 @param[in] Event Event triggered.
206 @param[in] Context Parameter passed with the event.
217 // If CheckApsStatus() is not stopped, otherwise return immediately.
219 if (!mStopCheckAllApsStatus
) {
220 CheckAndUpdateApsStatus ();
225 Get Protected mode code segment from current GDT table.
227 @return Protected mode code segment value.
234 IA32_DESCRIPTOR GdtrDesc
;
235 IA32_SEGMENT_DESCRIPTOR
*GdtEntry
;
240 AsmReadGdtr (&GdtrDesc
);
241 GdtEntryCount
= (GdtrDesc
.Limit
+ 1) / sizeof (IA32_SEGMENT_DESCRIPTOR
);
242 GdtEntry
= (IA32_SEGMENT_DESCRIPTOR
*) GdtrDesc
.Base
;
243 for (Index
= 0; Index
< GdtEntryCount
; Index
++) {
244 if (GdtEntry
->Bits
.L
== 0) {
245 if (GdtEntry
->Bits
.Type
> 8 && GdtEntry
->Bits
.L
== 0) {
251 ASSERT (Index
!= -1);
258 @param[in, out] Buffer Pointer to private data buffer.
266 CPU_MP_DATA
*CpuMpData
;
267 BOOLEAN MwaitSupport
;
268 ASM_RELOCATE_AP_LOOP AsmRelocateApLoopFunc
;
269 UINTN ProcessorNumber
;
271 MpInitLibWhoAmI (&ProcessorNumber
);
272 CpuMpData
= GetCpuMpData ();
273 MwaitSupport
= IsMwaitSupport ();
274 AsmRelocateApLoopFunc
= (ASM_RELOCATE_AP_LOOP
) (UINTN
) mReservedApLoopFunc
;
275 AsmRelocateApLoopFunc (
277 CpuMpData
->ApTargetCState
,
278 CpuMpData
->PmCodeSegment
,
279 mReservedTopOfApStack
- ProcessorNumber
* AP_SAFE_STACK_SIZE
,
280 (UINTN
) &mNumberToFinish
283 // It should never reach here
289 Callback function for ExitBootServices.
291 @param[in] Event Event whose notification function is being invoked.
292 @param[in] Context The pointer to the notification function's context,
293 which is implementation-dependent.
298 MpInitChangeApLoopCallback (
303 CPU_MP_DATA
*CpuMpData
;
305 CpuMpData
= GetCpuMpData ();
306 CpuMpData
->PmCodeSegment
= GetProtectedModeCS ();
307 CpuMpData
->ApLoopMode
= PcdGet8 (PcdCpuApLoopMode
);
308 mNumberToFinish
= CpuMpData
->CpuCount
- 1;
309 WakeUpAP (CpuMpData
, TRUE
, 0, RelocateApLoop
, NULL
);
310 while (mNumberToFinish
> 0) {
313 DEBUG ((DEBUG_INFO
, "%a() done!\n", __FUNCTION__
));
317 Initialize global data for MP support.
319 @param[in] CpuMpData The pointer to CPU MP Data structure.
323 IN CPU_MP_DATA
*CpuMpData
327 EFI_PHYSICAL_ADDRESS Address
;
328 UINTN ApSafeBufferSize
;
330 EFI_GCD_MEMORY_SPACE_DESCRIPTOR MemDesc
;
332 CPU_INFO_IN_HOB
*CpuInfoInHob
;
334 SaveCpuMpData (CpuMpData
);
336 if (CpuMpData
->CpuCount
== 1) {
338 // If only BSP exists, return
343 if (PcdGetBool (PcdCpuStackGuard
)) {
345 // One extra page at the bottom of the stack is needed for Guard page.
347 if (CpuMpData
->CpuApStackSize
<= EFI_PAGE_SIZE
) {
348 DEBUG ((DEBUG_ERROR
, "PcdCpuApStackSize is not big enough for Stack Guard!\n"));
353 // DXE will reuse stack allocated for APs at PEI phase if it's available.
354 // Let's check it here.
356 // Note: BSP's stack guard is set at DxeIpl phase. But for the sake of
357 // BSP/AP exchange, stack guard for ApTopOfStack of cpu 0 will still be
360 CpuInfoInHob
= (CPU_INFO_IN_HOB
*)(UINTN
)CpuMpData
->CpuInfoInHob
;
361 for (Index
= 0; Index
< CpuMpData
->CpuCount
; ++Index
) {
362 if (CpuInfoInHob
!= NULL
&& CpuInfoInHob
[Index
].ApTopOfStack
!= 0) {
363 StackBase
= (UINTN
)CpuInfoInHob
[Index
].ApTopOfStack
- CpuMpData
->CpuApStackSize
;
365 StackBase
= CpuMpData
->Buffer
+ Index
* CpuMpData
->CpuApStackSize
;
368 Status
= gDS
->GetMemorySpaceDescriptor (StackBase
, &MemDesc
);
369 ASSERT_EFI_ERROR (Status
);
371 Status
= gDS
->SetMemorySpaceAttributes (
373 EFI_PAGES_TO_SIZE (1),
374 MemDesc
.Attributes
| EFI_MEMORY_RP
376 ASSERT_EFI_ERROR (Status
);
378 DEBUG ((DEBUG_INFO
, "Stack Guard set at %lx [cpu%lu]!\n",
379 (UINT64
)StackBase
, (UINT64
)Index
));
384 // Avoid APs access invalid buffer data which allocated by BootServices,
385 // so we will allocate reserved data for AP loop code. We also need to
386 // allocate this buffer below 4GB due to APs may be transferred to 32bit
387 // protected mode on long mode DXE.
388 // Allocating it in advance since memory services are not available in
389 // Exit Boot Services callback function.
391 ApSafeBufferSize
= EFI_PAGES_TO_SIZE (EFI_SIZE_TO_PAGES (
392 CpuMpData
->AddressMap
.RelocateApLoopFuncSize
394 Address
= BASE_4GB
- 1;
395 Status
= gBS
->AllocatePages (
397 EfiReservedMemoryType
,
398 EFI_SIZE_TO_PAGES (ApSafeBufferSize
),
401 ASSERT_EFI_ERROR (Status
);
403 mReservedApLoopFunc
= (VOID
*) (UINTN
) Address
;
404 ASSERT (mReservedApLoopFunc
!= NULL
);
407 // Make sure that the buffer memory is executable if NX protection is enabled
408 // for EfiReservedMemoryType.
410 // TODO: Check EFI_MEMORY_XP bit set or not once it's available in DXE GCD
413 Status
= gDS
->GetMemorySpaceDescriptor (Address
, &MemDesc
);
414 if (!EFI_ERROR (Status
)) {
415 gDS
->SetMemorySpaceAttributes (
418 MemDesc
.Attributes
& (~EFI_MEMORY_XP
)
422 ApSafeBufferSize
= EFI_PAGES_TO_SIZE (EFI_SIZE_TO_PAGES (
423 CpuMpData
->CpuCount
* AP_SAFE_STACK_SIZE
425 Address
= BASE_4GB
- 1;
426 Status
= gBS
->AllocatePages (
428 EfiReservedMemoryType
,
429 EFI_SIZE_TO_PAGES (ApSafeBufferSize
),
432 ASSERT_EFI_ERROR (Status
);
434 mReservedTopOfApStack
= (UINTN
) Address
+ ApSafeBufferSize
;
435 ASSERT ((mReservedTopOfApStack
& (UINTN
)(CPU_STACK_ALIGNMENT
- 1)) == 0);
438 CpuMpData
->AddressMap
.RelocateApLoopFuncAddress
,
439 CpuMpData
->AddressMap
.RelocateApLoopFuncSize
442 Status
= gBS
->CreateEvent (
443 EVT_TIMER
| EVT_NOTIFY_SIGNAL
,
449 ASSERT_EFI_ERROR (Status
);
452 // Set timer to check all APs status.
454 Status
= gBS
->SetTimer (
459 ASSERT_EFI_ERROR (Status
);
461 Status
= gBS
->CreateEvent (
462 EVT_SIGNAL_EXIT_BOOT_SERVICES
,
464 MpInitChangeApLoopCallback
,
466 &mMpInitExitBootServicesEvent
468 ASSERT_EFI_ERROR (Status
);
470 Status
= gBS
->CreateEventEx (
473 MpInitChangeApLoopCallback
,
475 &gEfiEventLegacyBootGuid
,
478 ASSERT_EFI_ERROR (Status
);
482 This service executes a caller provided function on all enabled APs.
484 @param[in] Procedure A pointer to the function to be run on
485 enabled APs of the system. See type
487 @param[in] SingleThread If TRUE, then all the enabled APs execute
488 the function specified by Procedure one by
489 one, in ascending order of processor handle
490 number. If FALSE, then all the enabled APs
491 execute the function specified by Procedure
493 @param[in] WaitEvent The event created by the caller with CreateEvent()
494 service. If it is NULL, then execute in
495 blocking mode. BSP waits until all APs finish
496 or TimeoutInMicroSeconds expires. If it's
497 not NULL, then execute in non-blocking mode.
498 BSP requests the function specified by
499 Procedure to be started on all the enabled
500 APs, and go on executing immediately. If
501 all return from Procedure, or TimeoutInMicroSeconds
502 expires, this event is signaled. The BSP
503 can use the CheckEvent() or WaitForEvent()
504 services to check the state of event. Type
505 EFI_EVENT is defined in CreateEvent() in
506 the Unified Extensible Firmware Interface
508 @param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for
509 APs to return from Procedure, either for
510 blocking or non-blocking mode. Zero means
511 infinity. If the timeout expires before
512 all APs return from Procedure, then Procedure
513 on the failed APs is terminated. All enabled
514 APs are available for next function assigned
515 by MpInitLibStartupAllAPs() or
516 MPInitLibStartupThisAP().
517 If the timeout expires in blocking mode,
518 BSP returns EFI_TIMEOUT. If the timeout
519 expires in non-blocking mode, WaitEvent
520 is signaled with SignalEvent().
521 @param[in] ProcedureArgument The parameter passed into Procedure for
523 @param[out] FailedCpuList If NULL, this parameter is ignored. Otherwise,
524 if all APs finish successfully, then its
525 content is set to NULL. If not all APs
526 finish before timeout expires, then its
527 content is set to address of the buffer
528 holding handle numbers of the failed APs.
529 The buffer is allocated by MP Initialization
530 library, and it's the caller's responsibility to
531 free the buffer with FreePool() service.
532 In blocking mode, it is ready for consumption
533 when the call returns. In non-blocking mode,
534 it is ready when WaitEvent is signaled. The
535 list of failed CPU is terminated by
538 @retval EFI_SUCCESS In blocking mode, all APs have finished before
540 @retval EFI_SUCCESS In non-blocking mode, function has been dispatched
542 @retval EFI_UNSUPPORTED A non-blocking mode request was made after the
543 UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
545 @retval EFI_UNSUPPORTED WaitEvent is not NULL if non-blocking mode is not
547 @retval EFI_DEVICE_ERROR Caller processor is AP.
548 @retval EFI_NOT_STARTED No enabled APs exist in the system.
549 @retval EFI_NOT_READY Any enabled APs are busy.
550 @retval EFI_NOT_READY MP Initialize Library is not initialized.
551 @retval EFI_TIMEOUT In blocking mode, the timeout expired before
552 all enabled APs have finished.
553 @retval EFI_INVALID_PARAMETER Procedure is NULL.
558 MpInitLibStartupAllAPs (
559 IN EFI_AP_PROCEDURE Procedure
,
560 IN BOOLEAN SingleThread
,
561 IN EFI_EVENT WaitEvent OPTIONAL
,
562 IN UINTN TimeoutInMicroseconds
,
563 IN VOID
*ProcedureArgument OPTIONAL
,
564 OUT UINTN
**FailedCpuList OPTIONAL
570 // Temporarily stop checkAllApsStatus for avoid resource dead-lock.
572 mStopCheckAllApsStatus
= TRUE
;
574 Status
= StartupAllAPsWorker (
578 TimeoutInMicroseconds
,
584 // Start checkAllApsStatus
586 mStopCheckAllApsStatus
= FALSE
;
592 This service lets the caller get one enabled AP to execute a caller-provided
595 @param[in] Procedure A pointer to the function to be run on the
596 designated AP of the system. See type
598 @param[in] ProcessorNumber The handle number of the AP. The range is
599 from 0 to the total number of logical
600 processors minus 1. The total number of
601 logical processors can be retrieved by
602 MpInitLibGetNumberOfProcessors().
603 @param[in] WaitEvent The event created by the caller with CreateEvent()
604 service. If it is NULL, then execute in
605 blocking mode. BSP waits until this AP finish
606 or TimeoutInMicroSeconds expires. If it's
607 not NULL, then execute in non-blocking mode.
608 BSP requests the function specified by
609 Procedure to be started on this AP,
610 and go on executing immediately. If this AP
611 return from Procedure or TimeoutInMicroSeconds
612 expires, this event is signaled. The BSP
613 can use the CheckEvent() or WaitForEvent()
614 services to check the state of event. Type
615 EFI_EVENT is defined in CreateEvent() in
616 the Unified Extensible Firmware Interface
618 @param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for
619 this AP to finish this Procedure, either for
620 blocking or non-blocking mode. Zero means
621 infinity. If the timeout expires before
622 this AP returns from Procedure, then Procedure
623 on the AP is terminated. The
624 AP is available for next function assigned
625 by MpInitLibStartupAllAPs() or
626 MpInitLibStartupThisAP().
627 If the timeout expires in blocking mode,
628 BSP returns EFI_TIMEOUT. If the timeout
629 expires in non-blocking mode, WaitEvent
630 is signaled with SignalEvent().
631 @param[in] ProcedureArgument The parameter passed into Procedure on the
633 @param[out] Finished If NULL, this parameter is ignored. In
634 blocking mode, this parameter is ignored.
635 In non-blocking mode, if AP returns from
636 Procedure before the timeout expires, its
637 content is set to TRUE. Otherwise, the
638 value is set to FALSE. The caller can
639 determine if the AP returned from Procedure
640 by evaluating this value.
642 @retval EFI_SUCCESS In blocking mode, specified AP finished before
644 @retval EFI_SUCCESS In non-blocking mode, the function has been
645 dispatched to specified AP.
646 @retval EFI_UNSUPPORTED A non-blocking mode request was made after the
647 UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
649 @retval EFI_UNSUPPORTED WaitEvent is not NULL if non-blocking mode is not
651 @retval EFI_DEVICE_ERROR The calling processor is an AP.
652 @retval EFI_TIMEOUT In blocking mode, the timeout expired before
653 the specified AP has finished.
654 @retval EFI_NOT_READY The specified AP is busy.
655 @retval EFI_NOT_READY MP Initialize Library is not initialized.
656 @retval EFI_NOT_FOUND The processor with the handle specified by
657 ProcessorNumber does not exist.
658 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP or disabled AP.
659 @retval EFI_INVALID_PARAMETER Procedure is NULL.
664 MpInitLibStartupThisAP (
665 IN EFI_AP_PROCEDURE Procedure
,
666 IN UINTN ProcessorNumber
,
667 IN EFI_EVENT WaitEvent OPTIONAL
,
668 IN UINTN TimeoutInMicroseconds
,
669 IN VOID
*ProcedureArgument OPTIONAL
,
670 OUT BOOLEAN
*Finished OPTIONAL
676 // temporarily stop checkAllApsStatus for avoid resource dead-lock.
678 mStopCheckAllApsStatus
= TRUE
;
680 Status
= StartupThisAPWorker (
684 TimeoutInMicroseconds
,
689 mStopCheckAllApsStatus
= FALSE
;
695 This service switches the requested AP to be the BSP from that point onward.
696 This service changes the BSP for all purposes. This call can only be performed
699 @param[in] ProcessorNumber The handle number of AP that is to become the new
700 BSP. The range is from 0 to the total number of
701 logical processors minus 1. The total number of
702 logical processors can be retrieved by
703 MpInitLibGetNumberOfProcessors().
704 @param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an
705 enabled AP. Otherwise, it will be disabled.
707 @retval EFI_SUCCESS BSP successfully switched.
708 @retval EFI_UNSUPPORTED Switching the BSP cannot be completed prior to
709 this service returning.
710 @retval EFI_UNSUPPORTED Switching the BSP is not supported.
711 @retval EFI_DEVICE_ERROR The calling processor is an AP.
712 @retval EFI_NOT_FOUND The processor with the handle specified by
713 ProcessorNumber does not exist.
714 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the current BSP or
716 @retval EFI_NOT_READY The specified AP is busy.
717 @retval EFI_NOT_READY MP Initialize Library is not initialized.
723 IN UINTN ProcessorNumber
,
724 IN BOOLEAN EnableOldBSP
728 EFI_TIMER_ARCH_PROTOCOL
*Timer
;
733 // Locate Timer Arch Protocol
735 Status
= gBS
->LocateProtocol (&gEfiTimerArchProtocolGuid
, NULL
, (VOID
**) &Timer
);
736 if (EFI_ERROR (Status
)) {
742 // Save current rate of DXE Timer
744 Timer
->GetTimerPeriod (Timer
, &TimerPeriod
);
746 // Disable DXE Timer and drain pending interrupts
748 Timer
->SetTimerPeriod (Timer
, 0);
751 Status
= SwitchBSPWorker (ProcessorNumber
, EnableOldBSP
);
755 // Enable and restore rate of DXE Timer
757 Timer
->SetTimerPeriod (Timer
, TimerPeriod
);
764 This service lets the caller enable or disable an AP from this point onward.
765 This service may only be called from the BSP.
767 @param[in] ProcessorNumber The handle number of AP.
768 The range is from 0 to the total number of
769 logical processors minus 1. The total number of
770 logical processors can be retrieved by
771 MpInitLibGetNumberOfProcessors().
772 @param[in] EnableAP Specifies the new state for the processor for
773 enabled, FALSE for disabled.
774 @param[in] HealthFlag If not NULL, a pointer to a value that specifies
775 the new health status of the AP. This flag
776 corresponds to StatusFlag defined in
777 EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only
778 the PROCESSOR_HEALTH_STATUS_BIT is used. All other
779 bits are ignored. If it is NULL, this parameter
782 @retval EFI_SUCCESS The specified AP was enabled or disabled successfully.
783 @retval EFI_UNSUPPORTED Enabling or disabling an AP cannot be completed
784 prior to this service returning.
785 @retval EFI_UNSUPPORTED Enabling or disabling an AP is not supported.
786 @retval EFI_DEVICE_ERROR The calling processor is an AP.
787 @retval EFI_NOT_FOUND Processor with the handle specified by ProcessorNumber
789 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP.
790 @retval EFI_NOT_READY MP Initialize Library is not initialized.
795 MpInitLibEnableDisableAP (
796 IN UINTN ProcessorNumber
,
798 IN UINT32
*HealthFlag OPTIONAL
802 BOOLEAN TempStopCheckState
;
804 TempStopCheckState
= FALSE
;
806 // temporarily stop checkAllAPsStatus for initialize parameters.
808 if (!mStopCheckAllApsStatus
) {
809 mStopCheckAllApsStatus
= TRUE
;
810 TempStopCheckState
= TRUE
;
813 Status
= EnableDisableApWorker (ProcessorNumber
, EnableAP
, HealthFlag
);
815 if (TempStopCheckState
) {
816 mStopCheckAllApsStatus
= FALSE
;