2 MP initialize support functions for DXE phase.
4 Copyright (c) 2016 - 2023, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
11 #include <Library/UefiLib.h>
12 #include <Library/UefiBootServicesTableLib.h>
13 #include <Library/DebugAgentLib.h>
14 #include <Library/DxeServicesTableLib.h>
15 #include <Library/CcExitLib.h>
16 #include <Register/Amd/Fam17Msr.h>
17 #include <Register/Amd/Ghcb.h>
19 #include <Protocol/Timer.h>
21 #define AP_SAFE_STACK_SIZE 128
23 CPU_MP_DATA
*mCpuMpData
= NULL
;
24 EFI_EVENT mCheckAllApsEvent
= NULL
;
25 EFI_EVENT mMpInitExitBootServicesEvent
= NULL
;
26 EFI_EVENT mLegacyBootEvent
= NULL
;
27 volatile BOOLEAN mStopCheckAllApsStatus
= TRUE
;
28 RELOCATE_AP_LOOP_ENTRY mReservedApLoop
;
29 UINTN mReservedTopOfApStack
;
30 volatile UINT32 mNumberToFinish
= 0;
33 // Begin wakeup buffer allocation below 0x88000
35 STATIC EFI_PHYSICAL_ADDRESS mSevEsDxeWakeupBuffer
= 0x88000;
38 Enable Debug Agent to support source debugging on AP function.
47 // Initialize Debug Agent to support source level debug in DXE phase
49 InitializeDebugAgent (DEBUG_AGENT_INIT_DXE_AP
, NULL
, NULL
);
53 Get the pointer to CPU MP Data structure.
55 @return The pointer to CPU MP Data structure.
62 ASSERT (mCpuMpData
!= NULL
);
67 Save the pointer to CPU MP Data structure.
69 @param[in] CpuMpData The pointer to CPU MP Data structure will be saved.
73 IN CPU_MP_DATA
*CpuMpData
76 mCpuMpData
= CpuMpData
;
80 Get available system memory below 0x88000 by specified size.
82 @param[in] WakeupBufferSize Wakeup buffer size required
84 @retval other Return wakeup buffer address below 1MB.
85 @retval -1 Cannot find free memory below 1MB.
89 IN UINTN WakeupBufferSize
93 EFI_PHYSICAL_ADDRESS StartAddress
;
94 EFI_MEMORY_TYPE MemoryType
;
96 if (ConfidentialComputingGuestHas (CCAttrAmdSevEs
) &&
97 !ConfidentialComputingGuestHas (CCAttrAmdSevSnp
))
100 // An SEV-ES-only guest requires the memory to be reserved. SEV-SNP, which
101 // is also considered SEV-ES, uses a different AP startup method, though,
102 // which does not have the same requirement.
104 MemoryType
= EfiReservedMemoryType
;
106 MemoryType
= EfiBootServicesData
;
110 // Try to allocate buffer below 1M for waking vector.
111 // LegacyBios driver only reports warning when page allocation in range
112 // [0x60000, 0x88000) fails.
113 // This library is consumed by CpuDxe driver to produce CPU Arch protocol.
114 // LagacyBios driver depends on CPU Arch protocol which guarantees below
115 // allocation runs earlier than LegacyBios driver.
117 if (ConfidentialComputingGuestHas (CCAttrAmdSevEs
)) {
119 // SEV-ES Wakeup buffer should be under 0x88000 and under any previous one
121 StartAddress
= mSevEsDxeWakeupBuffer
;
123 StartAddress
= 0x88000;
126 Status
= gBS
->AllocatePages (
129 EFI_SIZE_TO_PAGES (WakeupBufferSize
),
132 ASSERT_EFI_ERROR (Status
);
133 if (EFI_ERROR (Status
)) {
134 StartAddress
= (EFI_PHYSICAL_ADDRESS
)-1;
135 } else if (ConfidentialComputingGuestHas (CCAttrAmdSevEs
)) {
137 // Next SEV-ES wakeup buffer allocation must be below this allocation
139 mSevEsDxeWakeupBuffer
= StartAddress
;
144 "WakeupBufferStart = %x, WakeupBufferSize = %x\n",
149 return (UINTN
)StartAddress
;
153 Get available EfiBootServicesCode memory below 4GB by specified size.
155 This buffer is required to safely transfer AP from real address mode to
156 protected mode or long mode, due to the fact that the buffer returned by
157 GetWakeupBuffer() may be marked as non-executable.
159 @param[in] BufferSize Wakeup transition buffer size.
161 @retval other Return wakeup transition buffer address below 4GB.
162 @retval 0 Cannot find free memory below 4GB.
170 EFI_PHYSICAL_ADDRESS StartAddress
;
172 StartAddress
= BASE_4GB
- 1;
173 Status
= gBS
->AllocatePages (
176 EFI_SIZE_TO_PAGES (BufferSize
),
179 if (EFI_ERROR (Status
)) {
183 return (UINTN
)StartAddress
;
187 Return the address of the SEV-ES AP jump table.
189 This buffer is required in order for an SEV-ES guest to transition from
192 @return Return SEV-ES AP jump table buffer
200 EFI_PHYSICAL_ADDRESS StartAddress
;
201 MSR_SEV_ES_GHCB_REGISTER Msr
;
203 BOOLEAN InterruptState
;
206 // Allocate 1 page for AP jump table page
208 StartAddress
= BASE_4GB
- 1;
209 Status
= gBS
->AllocatePages (
211 EfiReservedMemoryType
,
215 ASSERT_EFI_ERROR (Status
);
217 DEBUG ((DEBUG_INFO
, "Dxe: SevEsAPMemory = %lx\n", (UINTN
)StartAddress
));
220 // Save the SevEsAPMemory as the AP jump table.
222 Msr
.GhcbPhysicalAddress
= AsmReadMsr64 (MSR_SEV_ES_GHCB
);
225 CcExitVmgInit (Ghcb
, &InterruptState
);
226 CcExitVmgExit (Ghcb
, SVM_EXIT_AP_JUMP_TABLE
, 0, (UINT64
)(UINTN
)StartAddress
);
227 CcExitVmgDone (Ghcb
, InterruptState
);
229 return (UINTN
)StartAddress
;
233 Checks APs status and updates APs status if needed.
237 CheckAndUpdateApsStatus (
241 UINTN ProcessorNumber
;
243 CPU_MP_DATA
*CpuMpData
;
245 CpuMpData
= GetCpuMpData ();
248 // First, check whether pending StartupAllAPs() exists.
250 if (CpuMpData
->WaitEvent
!= NULL
) {
251 Status
= CheckAllAPs ();
253 // If all APs finish for StartupAllAPs(), signal the WaitEvent for it.
255 if (Status
!= EFI_NOT_READY
) {
256 Status
= gBS
->SignalEvent (CpuMpData
->WaitEvent
);
257 CpuMpData
->WaitEvent
= NULL
;
262 // Second, check whether pending StartupThisAPs() callings exist.
264 for (ProcessorNumber
= 0; ProcessorNumber
< CpuMpData
->CpuCount
; ProcessorNumber
++) {
265 if (CpuMpData
->CpuData
[ProcessorNumber
].WaitEvent
== NULL
) {
269 Status
= CheckThisAP (ProcessorNumber
);
271 if (Status
!= EFI_NOT_READY
) {
272 gBS
->SignalEvent (CpuMpData
->CpuData
[ProcessorNumber
].WaitEvent
);
273 CpuMpData
->CpuData
[ProcessorNumber
].WaitEvent
= NULL
;
279 Checks APs' status periodically.
281 This function is triggered by timer periodically to check the
282 state of APs for StartupAllAPs() and StartupThisAP() executed
283 in non-blocking mode.
285 @param[in] Event Event triggered.
286 @param[in] Context Parameter passed with the event.
297 // If CheckApsStatus() is not stopped, otherwise return immediately.
299 if (!mStopCheckAllApsStatus
) {
300 CheckAndUpdateApsStatus ();
305 Get Protected mode code segment with 16-bit default addressing
306 from current GDT table.
308 @return Protected mode 16-bit code segment value.
311 GetProtectedMode16CS (
315 IA32_DESCRIPTOR GdtrDesc
;
316 IA32_SEGMENT_DESCRIPTOR
*GdtEntry
;
321 AsmReadGdtr (&GdtrDesc
);
322 GdtEntryCount
= (GdtrDesc
.Limit
+ 1) / sizeof (IA32_SEGMENT_DESCRIPTOR
);
323 GdtEntry
= (IA32_SEGMENT_DESCRIPTOR
*)GdtrDesc
.Base
;
324 for (Index
= 0; Index
< GdtEntryCount
; Index
++) {
325 if (GdtEntry
->Bits
.L
== 0) {
326 if ((GdtEntry
->Bits
.Type
> 8) && (GdtEntry
->Bits
.DB
== 0)) {
334 ASSERT (Index
!= GdtEntryCount
);
339 Get Protected mode code segment from current GDT table.
341 @return Protected mode code segment value.
348 IA32_DESCRIPTOR GdtrDesc
;
349 IA32_SEGMENT_DESCRIPTOR
*GdtEntry
;
353 AsmReadGdtr (&GdtrDesc
);
354 GdtEntryCount
= (GdtrDesc
.Limit
+ 1) / sizeof (IA32_SEGMENT_DESCRIPTOR
);
355 GdtEntry
= (IA32_SEGMENT_DESCRIPTOR
*)GdtrDesc
.Base
;
356 for (Index
= 0; Index
< GdtEntryCount
; Index
++) {
357 if (GdtEntry
->Bits
.L
== 0) {
358 if ((GdtEntry
->Bits
.Type
> 8) && (GdtEntry
->Bits
.DB
== 1)) {
366 ASSERT (Index
!= GdtEntryCount
);
373 @param[in, out] Buffer Pointer to private data buffer.
381 CPU_MP_DATA
*CpuMpData
;
382 BOOLEAN MwaitSupport
;
383 UINTN ProcessorNumber
;
386 MpInitLibWhoAmI (&ProcessorNumber
);
387 CpuMpData
= GetCpuMpData ();
388 MwaitSupport
= IsMwaitSupport ();
389 if (CpuMpData
->UseSevEsAPMethod
) {
391 // 64-bit AMD processors with SEV-ES
393 StackStart
= CpuMpData
->SevEsAPResetStackStart
;
394 mReservedApLoop
.AmdSevEntry (
396 CpuMpData
->ApTargetCState
,
397 CpuMpData
->PmCodeSegment
,
398 StackStart
- ProcessorNumber
* AP_SAFE_STACK_SIZE
,
399 (UINTN
)&mNumberToFinish
,
400 CpuMpData
->Pm16CodeSegment
,
401 CpuMpData
->SevEsAPBuffer
,
402 CpuMpData
->WakeupBuffer
406 // Intel processors (32-bit or 64-bit), 32-bit AMD processors, or 64-bit AMD processors without SEV-ES
408 StackStart
= mReservedTopOfApStack
;
409 mReservedApLoop
.GenericEntry (
411 CpuMpData
->ApTargetCState
,
412 CpuMpData
->PmCodeSegment
,
413 StackStart
- ProcessorNumber
* AP_SAFE_STACK_SIZE
,
414 (UINTN
)&mNumberToFinish
,
415 CpuMpData
->Pm16CodeSegment
,
416 CpuMpData
->SevEsAPBuffer
,
417 CpuMpData
->WakeupBuffer
422 // It should never reach here
428 Callback function for ExitBootServices.
430 @param[in] Event Event whose notification function is being invoked.
431 @param[in] Context The pointer to the notification function's context,
432 which is implementation-dependent.
437 MpInitChangeApLoopCallback (
442 CPU_MP_DATA
*CpuMpData
;
444 CpuMpData
= GetCpuMpData ();
445 CpuMpData
->PmCodeSegment
= GetProtectedModeCS ();
446 CpuMpData
->Pm16CodeSegment
= GetProtectedMode16CS ();
447 CpuMpData
->ApLoopMode
= PcdGet8 (PcdCpuApLoopMode
);
448 mNumberToFinish
= CpuMpData
->CpuCount
- 1;
449 WakeUpAP (CpuMpData
, TRUE
, 0, RelocateApLoop
, NULL
, TRUE
);
450 while (mNumberToFinish
> 0) {
454 if (CpuMpData
->UseSevEsAPMethod
&& (CpuMpData
->WakeupBuffer
!= (UINTN
)-1)) {
456 // There are APs present. Re-use reserved memory area below 1MB from
457 // WakeupBuffer as the area to be used for transitioning to 16-bit mode
458 // in support of booting of the AP by an OS.
461 (VOID
*)CpuMpData
->WakeupBuffer
,
462 (VOID
*)(CpuMpData
->AddressMap
.RendezvousFunnelAddress
+
463 CpuMpData
->AddressMap
.SwitchToRealPM16ModeOffset
),
464 CpuMpData
->AddressMap
.SwitchToRealPM16ModeSize
468 DEBUG ((DEBUG_INFO
, "%a() done!\n", __FUNCTION__
));
472 Initialize global data for MP support.
474 @param[in] CpuMpData The pointer to CPU MP Data structure.
478 IN CPU_MP_DATA
*CpuMpData
482 EFI_PHYSICAL_ADDRESS Address
;
483 UINTN ApSafeBufferSize
;
485 EFI_GCD_MEMORY_SPACE_DESCRIPTOR MemDesc
;
487 CPU_INFO_IN_HOB
*CpuInfoInHob
;
489 SaveCpuMpData (CpuMpData
);
491 if (CpuMpData
->CpuCount
== 1) {
493 // If only BSP exists, return
498 if (PcdGetBool (PcdCpuStackGuard
)) {
500 // One extra page at the bottom of the stack is needed for Guard page.
502 if (CpuMpData
->CpuApStackSize
<= EFI_PAGE_SIZE
) {
503 DEBUG ((DEBUG_ERROR
, "PcdCpuApStackSize is not big enough for Stack Guard!\n"));
508 // DXE will reuse stack allocated for APs at PEI phase if it's available.
509 // Let's check it here.
511 // Note: BSP's stack guard is set at DxeIpl phase. But for the sake of
512 // BSP/AP exchange, stack guard for ApTopOfStack of cpu 0 will still be
515 CpuInfoInHob
= (CPU_INFO_IN_HOB
*)(UINTN
)CpuMpData
->CpuInfoInHob
;
516 for (Index
= 0; Index
< CpuMpData
->CpuCount
; ++Index
) {
517 if ((CpuInfoInHob
!= NULL
) && (CpuInfoInHob
[Index
].ApTopOfStack
!= 0)) {
518 StackBase
= (UINTN
)CpuInfoInHob
[Index
].ApTopOfStack
- CpuMpData
->CpuApStackSize
;
520 StackBase
= CpuMpData
->Buffer
+ Index
* CpuMpData
->CpuApStackSize
;
523 Status
= gDS
->GetMemorySpaceDescriptor (StackBase
, &MemDesc
);
524 ASSERT_EFI_ERROR (Status
);
526 Status
= gDS
->SetMemorySpaceAttributes (
528 EFI_PAGES_TO_SIZE (1),
529 MemDesc
.Attributes
| EFI_MEMORY_RP
531 ASSERT_EFI_ERROR (Status
);
535 "Stack Guard set at %lx [cpu%lu]!\n",
543 // Avoid APs access invalid buffer data which allocated by BootServices,
544 // so we will allocate reserved data for AP loop code. We also need to
545 // allocate this buffer below 4GB due to APs may be transferred to 32bit
546 // protected mode on long mode DXE.
547 // Allocating it in advance since memory services are not available in
548 // Exit Boot Services callback function.
550 ApSafeBufferSize
= EFI_PAGES_TO_SIZE (
552 CpuMpData
->AddressMap
.RelocateApLoopFuncSize
555 Address
= BASE_4GB
- 1;
556 Status
= gBS
->AllocatePages (
558 EfiReservedMemoryType
,
559 EFI_SIZE_TO_PAGES (ApSafeBufferSize
),
562 ASSERT_EFI_ERROR (Status
);
564 mReservedApLoop
.Data
= (VOID
*)(UINTN
)Address
;
565 ASSERT (mReservedApLoop
.Data
!= NULL
);
568 // Make sure that the buffer memory is executable if NX protection is enabled
569 // for EfiReservedMemoryType.
571 // TODO: Check EFI_MEMORY_XP bit set or not once it's available in DXE GCD
574 Status
= gDS
->GetMemorySpaceDescriptor (Address
, &MemDesc
);
575 if (!EFI_ERROR (Status
)) {
576 gDS
->SetMemorySpaceAttributes (
579 MemDesc
.Attributes
& (~EFI_MEMORY_XP
)
583 ApSafeBufferSize
= EFI_PAGES_TO_SIZE (
585 CpuMpData
->CpuCount
* AP_SAFE_STACK_SIZE
588 Address
= BASE_4GB
- 1;
589 Status
= gBS
->AllocatePages (
591 EfiReservedMemoryType
,
592 EFI_SIZE_TO_PAGES (ApSafeBufferSize
),
595 ASSERT_EFI_ERROR (Status
);
597 mReservedTopOfApStack
= (UINTN
)Address
+ ApSafeBufferSize
;
598 ASSERT ((mReservedTopOfApStack
& (UINTN
)(CPU_STACK_ALIGNMENT
- 1)) == 0);
600 mReservedApLoop
.Data
,
601 CpuMpData
->AddressMap
.RelocateApLoopFuncAddress
,
602 CpuMpData
->AddressMap
.RelocateApLoopFuncSize
605 Status
= gBS
->CreateEvent (
606 EVT_TIMER
| EVT_NOTIFY_SIGNAL
,
612 ASSERT_EFI_ERROR (Status
);
615 // Set timer to check all APs status.
617 Status
= gBS
->SetTimer (
620 EFI_TIMER_PERIOD_MICROSECONDS (
621 PcdGet32 (PcdCpuApStatusCheckIntervalInMicroSeconds
)
624 ASSERT_EFI_ERROR (Status
);
626 Status
= gBS
->CreateEvent (
627 EVT_SIGNAL_EXIT_BOOT_SERVICES
,
629 MpInitChangeApLoopCallback
,
631 &mMpInitExitBootServicesEvent
633 ASSERT_EFI_ERROR (Status
);
635 Status
= gBS
->CreateEventEx (
638 MpInitChangeApLoopCallback
,
640 &gEfiEventLegacyBootGuid
,
643 ASSERT_EFI_ERROR (Status
);
647 This service executes a caller provided function on all enabled APs.
649 @param[in] Procedure A pointer to the function to be run on
650 enabled APs of the system. See type
652 @param[in] SingleThread If TRUE, then all the enabled APs execute
653 the function specified by Procedure one by
654 one, in ascending order of processor handle
655 number. If FALSE, then all the enabled APs
656 execute the function specified by Procedure
658 @param[in] WaitEvent The event created by the caller with CreateEvent()
659 service. If it is NULL, then execute in
660 blocking mode. BSP waits until all APs finish
661 or TimeoutInMicroSeconds expires. If it's
662 not NULL, then execute in non-blocking mode.
663 BSP requests the function specified by
664 Procedure to be started on all the enabled
665 APs, and go on executing immediately. If
666 all return from Procedure, or TimeoutInMicroSeconds
667 expires, this event is signaled. The BSP
668 can use the CheckEvent() or WaitForEvent()
669 services to check the state of event. Type
670 EFI_EVENT is defined in CreateEvent() in
671 the Unified Extensible Firmware Interface
673 @param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for
674 APs to return from Procedure, either for
675 blocking or non-blocking mode. Zero means
676 infinity. If the timeout expires before
677 all APs return from Procedure, then Procedure
678 on the failed APs is terminated. All enabled
679 APs are available for next function assigned
680 by MpInitLibStartupAllAPs() or
681 MPInitLibStartupThisAP().
682 If the timeout expires in blocking mode,
683 BSP returns EFI_TIMEOUT. If the timeout
684 expires in non-blocking mode, WaitEvent
685 is signaled with SignalEvent().
686 @param[in] ProcedureArgument The parameter passed into Procedure for
688 @param[out] FailedCpuList If NULL, this parameter is ignored. Otherwise,
689 if all APs finish successfully, then its
690 content is set to NULL. If not all APs
691 finish before timeout expires, then its
692 content is set to address of the buffer
693 holding handle numbers of the failed APs.
694 The buffer is allocated by MP Initialization
695 library, and it's the caller's responsibility to
696 free the buffer with FreePool() service.
697 In blocking mode, it is ready for consumption
698 when the call returns. In non-blocking mode,
699 it is ready when WaitEvent is signaled. The
700 list of failed CPU is terminated by
703 @retval EFI_SUCCESS In blocking mode, all APs have finished before
705 @retval EFI_SUCCESS In non-blocking mode, function has been dispatched
707 @retval EFI_UNSUPPORTED A non-blocking mode request was made after the
708 UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
710 @retval EFI_UNSUPPORTED WaitEvent is not NULL if non-blocking mode is not
712 @retval EFI_DEVICE_ERROR Caller processor is AP.
713 @retval EFI_NOT_STARTED No enabled APs exist in the system.
714 @retval EFI_NOT_READY Any enabled APs are busy.
715 @retval EFI_NOT_READY MP Initialize Library is not initialized.
716 @retval EFI_TIMEOUT In blocking mode, the timeout expired before
717 all enabled APs have finished.
718 @retval EFI_INVALID_PARAMETER Procedure is NULL.
723 MpInitLibStartupAllAPs (
724 IN EFI_AP_PROCEDURE Procedure
,
725 IN BOOLEAN SingleThread
,
726 IN EFI_EVENT WaitEvent OPTIONAL
,
727 IN UINTN TimeoutInMicroseconds
,
728 IN VOID
*ProcedureArgument OPTIONAL
,
729 OUT UINTN
**FailedCpuList OPTIONAL
735 // Temporarily stop checkAllApsStatus for avoid resource dead-lock.
737 mStopCheckAllApsStatus
= TRUE
;
739 Status
= StartupAllCPUsWorker (
744 TimeoutInMicroseconds
,
750 // Start checkAllApsStatus
752 mStopCheckAllApsStatus
= FALSE
;
758 This service lets the caller get one enabled AP to execute a caller-provided
761 @param[in] Procedure A pointer to the function to be run on the
762 designated AP of the system. See type
764 @param[in] ProcessorNumber The handle number of the AP. The range is
765 from 0 to the total number of logical
766 processors minus 1. The total number of
767 logical processors can be retrieved by
768 MpInitLibGetNumberOfProcessors().
769 @param[in] WaitEvent The event created by the caller with CreateEvent()
770 service. If it is NULL, then execute in
771 blocking mode. BSP waits until this AP finish
772 or TimeoutInMicroSeconds expires. If it's
773 not NULL, then execute in non-blocking mode.
774 BSP requests the function specified by
775 Procedure to be started on this AP,
776 and go on executing immediately. If this AP
777 return from Procedure or TimeoutInMicroSeconds
778 expires, this event is signaled. The BSP
779 can use the CheckEvent() or WaitForEvent()
780 services to check the state of event. Type
781 EFI_EVENT is defined in CreateEvent() in
782 the Unified Extensible Firmware Interface
784 @param[in] TimeoutInMicroseconds Indicates the time limit in microseconds for
785 this AP to finish this Procedure, either for
786 blocking or non-blocking mode. Zero means
787 infinity. If the timeout expires before
788 this AP returns from Procedure, then Procedure
789 on the AP is terminated. The
790 AP is available for next function assigned
791 by MpInitLibStartupAllAPs() or
792 MpInitLibStartupThisAP().
793 If the timeout expires in blocking mode,
794 BSP returns EFI_TIMEOUT. If the timeout
795 expires in non-blocking mode, WaitEvent
796 is signaled with SignalEvent().
797 @param[in] ProcedureArgument The parameter passed into Procedure on the
799 @param[out] Finished If NULL, this parameter is ignored. In
800 blocking mode, this parameter is ignored.
801 In non-blocking mode, if AP returns from
802 Procedure before the timeout expires, its
803 content is set to TRUE. Otherwise, the
804 value is set to FALSE. The caller can
805 determine if the AP returned from Procedure
806 by evaluating this value.
808 @retval EFI_SUCCESS In blocking mode, specified AP finished before
810 @retval EFI_SUCCESS In non-blocking mode, the function has been
811 dispatched to specified AP.
812 @retval EFI_UNSUPPORTED A non-blocking mode request was made after the
813 UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
815 @retval EFI_UNSUPPORTED WaitEvent is not NULL if non-blocking mode is not
817 @retval EFI_DEVICE_ERROR The calling processor is an AP.
818 @retval EFI_TIMEOUT In blocking mode, the timeout expired before
819 the specified AP has finished.
820 @retval EFI_NOT_READY The specified AP is busy.
821 @retval EFI_NOT_READY MP Initialize Library is not initialized.
822 @retval EFI_NOT_FOUND The processor with the handle specified by
823 ProcessorNumber does not exist.
824 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP or disabled AP.
825 @retval EFI_INVALID_PARAMETER Procedure is NULL.
830 MpInitLibStartupThisAP (
831 IN EFI_AP_PROCEDURE Procedure
,
832 IN UINTN ProcessorNumber
,
833 IN EFI_EVENT WaitEvent OPTIONAL
,
834 IN UINTN TimeoutInMicroseconds
,
835 IN VOID
*ProcedureArgument OPTIONAL
,
836 OUT BOOLEAN
*Finished OPTIONAL
842 // temporarily stop checkAllApsStatus for avoid resource dead-lock.
844 mStopCheckAllApsStatus
= TRUE
;
846 Status
= StartupThisAPWorker (
850 TimeoutInMicroseconds
,
855 mStopCheckAllApsStatus
= FALSE
;
861 This service switches the requested AP to be the BSP from that point onward.
862 This service changes the BSP for all purposes. This call can only be performed
865 @param[in] ProcessorNumber The handle number of AP that is to become the new
866 BSP. The range is from 0 to the total number of
867 logical processors minus 1. The total number of
868 logical processors can be retrieved by
869 MpInitLibGetNumberOfProcessors().
870 @param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an
871 enabled AP. Otherwise, it will be disabled.
873 @retval EFI_SUCCESS BSP successfully switched.
874 @retval EFI_UNSUPPORTED Switching the BSP cannot be completed prior to
875 this service returning.
876 @retval EFI_UNSUPPORTED Switching the BSP is not supported.
877 @retval EFI_DEVICE_ERROR The calling processor is an AP.
878 @retval EFI_NOT_FOUND The processor with the handle specified by
879 ProcessorNumber does not exist.
880 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the current BSP or
882 @retval EFI_NOT_READY The specified AP is busy.
883 @retval EFI_NOT_READY MP Initialize Library is not initialized.
889 IN UINTN ProcessorNumber
,
890 IN BOOLEAN EnableOldBSP
894 EFI_TIMER_ARCH_PROTOCOL
*Timer
;
899 // Locate Timer Arch Protocol
901 Status
= gBS
->LocateProtocol (&gEfiTimerArchProtocolGuid
, NULL
, (VOID
**)&Timer
);
902 if (EFI_ERROR (Status
)) {
908 // Save current rate of DXE Timer
910 Timer
->GetTimerPeriod (Timer
, &TimerPeriod
);
912 // Disable DXE Timer and drain pending interrupts
914 Timer
->SetTimerPeriod (Timer
, 0);
917 Status
= SwitchBSPWorker (ProcessorNumber
, EnableOldBSP
);
921 // Enable and restore rate of DXE Timer
923 Timer
->SetTimerPeriod (Timer
, TimerPeriod
);
930 This service lets the caller enable or disable an AP from this point onward.
931 This service may only be called from the BSP.
933 @param[in] ProcessorNumber The handle number of AP.
934 The range is from 0 to the total number of
935 logical processors minus 1. The total number of
936 logical processors can be retrieved by
937 MpInitLibGetNumberOfProcessors().
938 @param[in] EnableAP Specifies the new state for the processor for
939 enabled, FALSE for disabled.
940 @param[in] HealthFlag If not NULL, a pointer to a value that specifies
941 the new health status of the AP. This flag
942 corresponds to StatusFlag defined in
943 EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only
944 the PROCESSOR_HEALTH_STATUS_BIT is used. All other
945 bits are ignored. If it is NULL, this parameter
948 @retval EFI_SUCCESS The specified AP was enabled or disabled successfully.
949 @retval EFI_UNSUPPORTED Enabling or disabling an AP cannot be completed
950 prior to this service returning.
951 @retval EFI_UNSUPPORTED Enabling or disabling an AP is not supported.
952 @retval EFI_DEVICE_ERROR The calling processor is an AP.
953 @retval EFI_NOT_FOUND Processor with the handle specified by ProcessorNumber
955 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP.
956 @retval EFI_NOT_READY MP Initialize Library is not initialized.
961 MpInitLibEnableDisableAP (
962 IN UINTN ProcessorNumber
,
964 IN UINT32
*HealthFlag OPTIONAL
968 BOOLEAN TempStopCheckState
;
970 TempStopCheckState
= FALSE
;
972 // temporarily stop checkAllAPsStatus for initialize parameters.
974 if (!mStopCheckAllApsStatus
) {
975 mStopCheckAllApsStatus
= TRUE
;
976 TempStopCheckState
= TRUE
;
979 Status
= EnableDisableApWorker (ProcessorNumber
, EnableAP
, HealthFlag
);
981 if (TempStopCheckState
) {
982 mStopCheckAllApsStatus
= FALSE
;
989 This funtion will try to invoke platform specific microcode shadow logic to
990 relocate microcode update patches into memory.
992 @param[in, out] CpuMpData The pointer to CPU MP Data structure.
994 @retval EFI_SUCCESS Shadow microcode success.
995 @retval EFI_OUT_OF_RESOURCES No enough resource to complete the operation.
996 @retval EFI_UNSUPPORTED Can't find platform specific microcode shadow
1000 PlatformShadowMicrocode (
1001 IN OUT CPU_MP_DATA
*CpuMpData
1005 // There is no DXE version of platform shadow microcode protocol so far.
1006 // A platform which only uses DxeMpInitLib instance could only supports
1007 // the PCD based microcode shadowing.
1009 return EFI_UNSUPPORTED
;