2 Construct MP Services Protocol on top of the EMU Thread protocol.
3 This code makes APs show up in the emulator. PcdEmuApCount is the
4 number of APs the emulator should produce.
6 The MP Services Protocol provides a generalized way of performing following tasks:
7 - Retrieving information of multi-processor environment and MP-related status of
9 - Dispatching user-provided function to APs.
10 - Maintain MP-related processor status.
12 The MP Services Protocol must be produced on any system with more than one logical
15 The Protocol is available only during boot time.
17 MP Services Protocol is hardware-independent. Most of the logic of this protocol
18 is architecturally neutral. It abstracts the multi-processor environment and
19 status of processors, and provides interfaces to retrieve information, maintain,
22 MP Services Protocol may be consumed by ACPI module. The ACPI module may use this
23 protocol to retrieve data that are needed for an MP platform and report them to OS.
24 MP Services Protocol may also be used to program and configure processors, such
25 as MTRR synchronization for memory space attributes setting in DXE Services.
26 MP Services Protocol may be used by non-CPU DXE drivers to speed up platform boot
27 by taking advantage of the processing capabilities of the APs, for example, using
28 APs to help test system memory in parallel with other device initialization.
29 Diagnostics applications may also use this protocol for multi-processor.
31 Copyright (c) 2006 - 2012, Intel Corporation. All rights reserved.<BR>
32 Portitions Copyright (c) 2011, Apple Inc. All rights reserved.
33 This program and the accompanying materials are licensed and made available under
34 the terms and conditions of the BSD License that accompanies this distribution.
35 The full text of the license may be found at
36 http://opensource.org/licenses/bsd-license.php.
38 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
39 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
44 #include "CpuDriver.h"
47 MP_SYSTEM_DATA gMPSystem
;
48 EMU_THREAD_THUNK_PROTOCOL
*gThread
= NULL
;
49 EFI_EVENT gReadToBootEvent
;
50 BOOLEAN gReadToBoot
= FALSE
;
60 UINTN ProcessorNumber
;
62 Status
= CpuMpServicesWhoAmI (&mMpServicesTemplate
, &ProcessorNumber
);
63 if (EFI_ERROR (Status
)) {
67 return (gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) != 0;
73 IN PROCESSOR_DATA_BLOCK
*Processor
,
74 IN EFI_AP_PROCEDURE Procedure
,
75 IN VOID
*ProcedureArgument
78 gThread
->MutexLock (Processor
->ProcedureLock
);
79 Processor
->Parameter
= ProcedureArgument
;
80 Processor
->Procedure
= Procedure
;
81 gThread
->MutexUnlock (Processor
->ProcedureLock
);
86 GetNextBlockedNumber (
91 PROCESSOR_STATE ProcessorState
;
92 PROCESSOR_DATA_BLOCK
*Data
;
94 for (Number
= 0; Number
< gMPSystem
.NumberOfProcessors
; Number
++) {
95 Data
= &gMPSystem
.ProcessorData
[Number
];
96 if ((Data
->Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) != 0) {
101 gThread
->MutexLock (Data
->StateLock
);
102 ProcessorState
= Data
->State
;
103 gThread
->MutexUnlock (Data
->StateLock
);
105 if (ProcessorState
== CPU_STATE_BLOCKED
) {
106 *NextNumber
= Number
;
111 return EFI_NOT_FOUND
;
118 This service retrieves the number of logical processor in the platform
119 and the number of those logical processors that are enabled on this boot.
120 This service may only be called from the BSP.
122 This function is used to retrieve the following information:
123 - The number of logical processors that are present in the system.
124 - The number of enabled logical processors in the system at the instant
127 Because MP Service Protocol provides services to enable and disable processors
128 dynamically, the number of enabled logical processors may vary during the
129 course of a boot session.
131 If this service is called from an AP, then EFI_DEVICE_ERROR is returned.
132 If NumberOfProcessors or NumberOfEnabledProcessors is NULL, then
133 EFI_INVALID_PARAMETER is returned. Otherwise, the total number of processors
134 is returned in NumberOfProcessors, the number of currently enabled processor
135 is returned in NumberOfEnabledProcessors, and EFI_SUCCESS is returned.
137 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL
139 @param[out] NumberOfProcessors Pointer to the total number of logical
140 processors in the system, including the BSP
142 @param[out] NumberOfEnabledProcessors Pointer to the number of enabled logical
143 processors that exist in system, including
146 @retval EFI_SUCCESS The number of logical processors and enabled
147 logical processors was retrieved.
148 @retval EFI_DEVICE_ERROR The calling processor is an AP.
149 @retval EFI_INVALID_PARAMETER NumberOfProcessors is NULL.
150 @retval EFI_INVALID_PARAMETER NumberOfEnabledProcessors is NULL.
155 CpuMpServicesGetNumberOfProcessors (
156 IN EFI_MP_SERVICES_PROTOCOL
*This
,
157 OUT UINTN
*NumberOfProcessors
,
158 OUT UINTN
*NumberOfEnabledProcessors
161 if ((NumberOfProcessors
== NULL
) || (NumberOfEnabledProcessors
== NULL
)) {
162 return EFI_INVALID_PARAMETER
;
166 return EFI_DEVICE_ERROR
;
169 *NumberOfProcessors
= gMPSystem
.NumberOfProcessors
;
170 *NumberOfEnabledProcessors
= gMPSystem
.NumberOfEnabledProcessors
;
177 Gets detailed MP-related information on the requested processor at the
178 instant this call is made. This service may only be called from the BSP.
180 This service retrieves detailed MP-related information about any processor
181 on the platform. Note the following:
182 - The processor information may change during the course of a boot session.
183 - The information presented here is entirely MP related.
185 Information regarding the number of caches and their sizes, frequency of operation,
186 slot numbers is all considered platform-related information and is not provided
189 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL
191 @param[in] ProcessorNumber The handle number of processor.
192 @param[out] ProcessorInfoBuffer A pointer to the buffer where information for
193 the requested processor is deposited.
195 @retval EFI_SUCCESS Processor information was returned.
196 @retval EFI_DEVICE_ERROR The calling processor is an AP.
197 @retval EFI_INVALID_PARAMETER ProcessorInfoBuffer is NULL.
198 @retval EFI_NOT_FOUND The processor with the handle specified by
199 ProcessorNumber does not exist in the platform.
204 CpuMpServicesGetProcessorInfo (
205 IN EFI_MP_SERVICES_PROTOCOL
*This
,
206 IN UINTN ProcessorNumber
,
207 OUT EFI_PROCESSOR_INFORMATION
*ProcessorInfoBuffer
210 if (ProcessorInfoBuffer
== NULL
) {
211 return EFI_INVALID_PARAMETER
;
215 return EFI_DEVICE_ERROR
;
218 if (ProcessorNumber
>= gMPSystem
.NumberOfProcessors
) {
219 return EFI_NOT_FOUND
;
222 CopyMem (ProcessorInfoBuffer
, &gMPSystem
.ProcessorData
[ProcessorNumber
], sizeof (EFI_PROCESSOR_INFORMATION
));
228 This service executes a caller provided function on all enabled APs. APs can
229 run either simultaneously or one at a time in sequence. This service supports
230 both blocking and non-blocking requests. The non-blocking requests use EFI
231 events so the BSP can detect when the APs have finished. This service may only
232 be called from the BSP.
234 This function is used to dispatch all the enabled APs to the function specified
235 by Procedure. If any enabled AP is busy, then EFI_NOT_READY is returned
236 immediately and Procedure is not started on any AP.
238 If SingleThread is TRUE, all the enabled APs execute the function specified by
239 Procedure one by one, in ascending order of processor handle number. Otherwise,
240 all the enabled APs execute the function specified by Procedure simultaneously.
242 If WaitEvent is NULL, execution is in blocking mode. The BSP waits until all
243 APs finish or TimeoutInMicroseconds expires. Otherwise, execution is in non-blocking
244 mode, and the BSP returns from this service without waiting for APs. If a
245 non-blocking mode is requested after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT
246 is signaled, then EFI_UNSUPPORTED must be returned.
248 If the timeout specified by TimeoutInMicroseconds expires before all APs return
249 from Procedure, then Procedure on the failed APs is terminated. All enabled APs
250 are always available for further calls to EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()
251 and EFI_MP_SERVICES_PROTOCOL.StartupThisAP(). If FailedCpuList is not NULL, its
252 content points to the list of processor handle numbers in which Procedure was
255 Note: It is the responsibility of the consumer of the EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()
256 to make sure that the nature of the code that is executed on the BSP and the
257 dispatched APs is well controlled. The MP Services Protocol does not guarantee
258 that the Procedure function is MP-safe. Hence, the tasks that can be run in
259 parallel are limited to certain independent tasks and well-controlled exclusive
260 code. EFI services and protocols may not be called by APs unless otherwise
263 In blocking execution mode, BSP waits until all APs finish or
264 TimeoutInMicroseconds expires.
266 In non-blocking execution mode, BSP is freed to return to the caller and then
267 proceed to the next task without having to wait for APs. The following
268 sequence needs to occur in a non-blocking execution mode:
270 -# The caller that intends to use this MP Services Protocol in non-blocking
271 mode creates WaitEvent by calling the EFI CreateEvent() service. The caller
272 invokes EFI_MP_SERVICES_PROTOCOL.StartupAllAPs(). If the parameter WaitEvent
273 is not NULL, then StartupAllAPs() executes in non-blocking mode. It requests
274 the function specified by Procedure to be started on all the enabled APs,
275 and releases the BSP to continue with other tasks.
276 -# The caller can use the CheckEvent() and WaitForEvent() services to check
277 the state of the WaitEvent created in step 1.
278 -# When the APs complete their task or TimeoutInMicroSecondss expires, the MP
279 Service signals WaitEvent by calling the EFI SignalEvent() function. If
280 FailedCpuList is not NULL, its content is available when WaitEvent is
281 signaled. If all APs returned from Procedure prior to the timeout, then
282 FailedCpuList is set to NULL. If not all APs return from Procedure before
283 the timeout, then FailedCpuList is filled in with the list of the failed
284 APs. The buffer is allocated by MP Service Protocol using AllocatePool().
285 It is the caller's responsibility to free the buffer with FreePool() service.
286 -# This invocation of SignalEvent() function informs the caller that invoked
287 EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() that either all the APs completed
288 the specified task or a timeout occurred. The contents of FailedCpuList
289 can be examined to determine which APs did not complete the specified task
290 prior to the timeout.
292 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL
294 @param[in] Procedure A pointer to the function to be run on
295 enabled APs of the system. See type
297 @param[in] SingleThread If TRUE, then all the enabled APs execute
298 the function specified by Procedure one by
299 one, in ascending order of processor handle
300 number. If FALSE, then all the enabled APs
301 execute the function specified by Procedure
303 @param[in] WaitEvent The event created by the caller with CreateEvent()
304 service. If it is NULL, then execute in
305 blocking mode. BSP waits until all APs finish
306 or TimeoutInMicroseconds expires. If it's
307 not NULL, then execute in non-blocking mode.
308 BSP requests the function specified by
309 Procedure to be started on all the enabled
310 APs, and go on executing immediately. If
311 all return from Procedure, or TimeoutInMicroseconds
312 expires, this event is signaled. The BSP
313 can use the CheckEvent() or WaitForEvent()
314 services to check the state of event. Type
315 EFI_EVENT is defined in CreateEvent() in
316 the Unified Extensible Firmware Interface
318 @param[in] TimeoutInMicrosecsond Indicates the time limit in microseconds for
319 APs to return from Procedure, either for
320 blocking or non-blocking mode. Zero means
321 infinity. If the timeout expires before
322 all APs return from Procedure, then Procedure
323 on the failed APs is terminated. All enabled
324 APs are available for next function assigned
325 by EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()
326 or EFI_MP_SERVICES_PROTOCOL.StartupThisAP().
327 If the timeout expires in blocking mode,
328 BSP returns EFI_TIMEOUT. If the timeout
329 expires in non-blocking mode, WaitEvent
330 is signaled with SignalEvent().
331 @param[in] ProcedureArgument The parameter passed into Procedure for
333 @param[out] FailedCpuList If NULL, this parameter is ignored. Otherwise,
334 if all APs finish successfully, then its
335 content is set to NULL. If not all APs
336 finish before timeout expires, then its
337 content is set to address of the buffer
338 holding handle numbers of the failed APs.
339 The buffer is allocated by MP Service Protocol,
340 and it's the caller's responsibility to
341 free the buffer with FreePool() service.
342 In blocking mode, it is ready for consumption
343 when the call returns. In non-blocking mode,
344 it is ready when WaitEvent is signaled. The
345 list of failed CPU is terminated by
348 @retval EFI_SUCCESS In blocking mode, all APs have finished before
350 @retval EFI_SUCCESS In non-blocking mode, function has been dispatched
352 @retval EFI_UNSUPPORTED A non-blocking mode request was made after the
353 UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
355 @retval EFI_DEVICE_ERROR Caller processor is AP.
356 @retval EFI_NOT_STARTED No enabled APs exist in the system.
357 @retval EFI_NOT_READY Any enabled APs are busy.
358 @retval EFI_TIMEOUT In blocking mode, the timeout expired before
359 all enabled APs have finished.
360 @retval EFI_INVALID_PARAMETER Procedure is NULL.
365 CpuMpServicesStartupAllAps (
366 IN EFI_MP_SERVICES_PROTOCOL
*This
,
367 IN EFI_AP_PROCEDURE Procedure
,
368 IN BOOLEAN SingleThread
,
369 IN EFI_EVENT WaitEvent OPTIONAL
,
370 IN UINTN TimeoutInMicroseconds
,
371 IN VOID
*ProcedureArgument OPTIONAL
,
372 OUT UINTN
**FailedCpuList OPTIONAL
376 PROCESSOR_DATA_BLOCK
*ProcessorData
;
379 PROCESSOR_STATE APInitialState
;
380 PROCESSOR_STATE ProcessorState
;
385 return EFI_DEVICE_ERROR
;
388 if (gMPSystem
.NumberOfProcessors
== 1) {
389 return EFI_NOT_STARTED
;
392 if (Procedure
== NULL
) {
393 return EFI_INVALID_PARAMETER
;
396 if ((WaitEvent
!= NULL
) && gReadToBoot
) {
397 return EFI_UNSUPPORTED
;
401 if (FailedCpuList
!= NULL
) {
402 gMPSystem
.FailedList
= AllocatePool ((gMPSystem
.NumberOfProcessors
+ 1) * sizeof (UINTN
));
403 if (gMPSystem
.FailedList
== NULL
) {
404 return EFI_OUT_OF_RESOURCES
;
406 SetMemN (gMPSystem
.FailedList
, (gMPSystem
.NumberOfProcessors
+ 1) * sizeof (UINTN
), END_OF_CPU_LIST
);
407 gMPSystem
.FailedListIndex
= 0;
408 *FailedCpuList
= gMPSystem
.FailedList
;
411 Timeout
= TimeoutInMicroseconds
;
413 ProcessorData
= NULL
;
415 gMPSystem
.FinishCount
= 0;
416 gMPSystem
.StartCount
= 0;
417 gMPSystem
.SingleThread
= SingleThread
;
418 APInitialState
= CPU_STATE_READY
;
420 for (Number
= 0; Number
< gMPSystem
.NumberOfProcessors
; Number
++) {
421 ProcessorData
= &gMPSystem
.ProcessorData
[Number
];
423 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) == PROCESSOR_AS_BSP_BIT
) {
428 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_ENABLED_BIT
) == 0) {
429 // Skip Disabled processors
430 gMPSystem
.FailedList
[gMPSystem
.FailedListIndex
++] = Number
;
435 // Get APs prepared, and put failing APs into FailedCpuList
436 // if "SingleThread", only 1 AP will put to ready state, other AP will be put to ready
437 // state 1 by 1, until the previous 1 finished its task
438 // if not "SingleThread", all APs are put to ready state from the beginning
440 gThread
->MutexLock(ProcessorData
->StateLock
);
441 if (ProcessorData
->State
== CPU_STATE_IDLE
) {
442 ProcessorData
->State
= APInitialState
;
443 gThread
->MutexUnlock (ProcessorData
->StateLock
);
445 gMPSystem
.StartCount
++;
447 APInitialState
= CPU_STATE_BLOCKED
;
450 gThread
->MutexUnlock (ProcessorData
->StateLock
);
451 return EFI_NOT_READY
;
455 if (WaitEvent
!= NULL
) {
456 for (Number
= 0; Number
< gMPSystem
.NumberOfProcessors
; Number
++) {
457 ProcessorData
= &gMPSystem
.ProcessorData
[Number
];
458 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) == PROCESSOR_AS_BSP_BIT
) {
463 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_ENABLED_BIT
) == 0) {
464 // Skip Disabled processors
468 gThread
->MutexLock (ProcessorData
->StateLock
);
469 ProcessorState
= ProcessorData
->State
;
470 gThread
->MutexUnlock (ProcessorData
->StateLock
);
472 if (ProcessorState
== CPU_STATE_READY
) {
473 SetApProcedure (ProcessorData
, Procedure
, ProcedureArgument
);
478 // Save data into private data structure, and create timer to poll AP state before exiting
480 gMPSystem
.Procedure
= Procedure
;
481 gMPSystem
.ProcedureArgument
= ProcedureArgument
;
482 gMPSystem
.WaitEvent
= WaitEvent
;
483 gMPSystem
.Timeout
= TimeoutInMicroseconds
;
484 gMPSystem
.TimeoutActive
= (BOOLEAN
)(TimeoutInMicroseconds
!= 0);
485 Status
= gBS
->SetTimer (
486 gMPSystem
.CheckAllAPsEvent
,
495 for (Number
= 0; Number
< gMPSystem
.NumberOfProcessors
; Number
++) {
496 ProcessorData
= &gMPSystem
.ProcessorData
[Number
];
497 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) == PROCESSOR_AS_BSP_BIT
) {
502 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_ENABLED_BIT
) == 0) {
503 // Skip Disabled processors
507 gThread
->MutexLock (ProcessorData
->StateLock
);
508 ProcessorState
= ProcessorData
->State
;
509 gThread
->MutexUnlock (ProcessorData
->StateLock
);
511 switch (ProcessorState
) {
512 case CPU_STATE_READY
:
513 SetApProcedure (ProcessorData
, Procedure
, ProcedureArgument
);
516 case CPU_STATE_FINISHED
:
517 gMPSystem
.FinishCount
++;
519 Status
= GetNextBlockedNumber (&NextNumber
);
520 if (!EFI_ERROR (Status
)) {
521 gThread
->MutexLock (gMPSystem
.ProcessorData
[NextNumber
].StateLock
);
522 gMPSystem
.ProcessorData
[NextNumber
].State
= CPU_STATE_READY
;
523 gThread
->MutexUnlock (gMPSystem
.ProcessorData
[NextNumber
].StateLock
);
527 gThread
->MutexLock (ProcessorData
->StateLock
);
528 ProcessorData
->State
= CPU_STATE_IDLE
;
529 gThread
->MutexUnlock (ProcessorData
->StateLock
);
538 if (gMPSystem
.FinishCount
== gMPSystem
.StartCount
) {
539 Status
= EFI_SUCCESS
;
543 if ((TimeoutInMicroseconds
!= 0) && (Timeout
< 0)) {
544 Status
= EFI_TIMEOUT
;
548 gBS
->Stall (gPollInterval
);
549 Timeout
-= gPollInterval
;
553 if (FailedCpuList
!= NULL
) {
554 if (gMPSystem
.FailedListIndex
== 0) {
555 FreePool (*FailedCpuList
);
556 *FailedCpuList
= NULL
;
565 This service lets the caller get one enabled AP to execute a caller-provided
566 function. The caller can request the BSP to either wait for the completion
567 of the AP or just proceed with the next task by using the EFI event mechanism.
568 See EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() for more details on non-blocking
569 execution support. This service may only be called from the BSP.
571 This function is used to dispatch one enabled AP to the function specified by
572 Procedure passing in the argument specified by ProcedureArgument. If WaitEvent
573 is NULL, execution is in blocking mode. The BSP waits until the AP finishes or
574 TimeoutInMicroSecondss expires. Otherwise, execution is in non-blocking mode.
575 BSP proceeds to the next task without waiting for the AP. If a non-blocking mode
576 is requested after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT is signaled,
577 then EFI_UNSUPPORTED must be returned.
579 If the timeout specified by TimeoutInMicroseconds expires before the AP returns
580 from Procedure, then execution of Procedure by the AP is terminated. The AP is
581 available for subsequent calls to EFI_MP_SERVICES_PROTOCOL.StartupAllAPs() and
582 EFI_MP_SERVICES_PROTOCOL.StartupThisAP().
584 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL
586 @param[in] Procedure A pointer to the function to be run on
587 enabled APs of the system. See type
589 @param[in] ProcessorNumber The handle number of the AP. The range is
590 from 0 to the total number of logical
591 processors minus 1. The total number of
592 logical processors can be retrieved by
593 EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().
594 @param[in] WaitEvent The event created by the caller with CreateEvent()
595 service. If it is NULL, then execute in
596 blocking mode. BSP waits until all APs finish
597 or TimeoutInMicroseconds expires. If it's
598 not NULL, then execute in non-blocking mode.
599 BSP requests the function specified by
600 Procedure to be started on all the enabled
601 APs, and go on executing immediately. If
602 all return from Procedure or TimeoutInMicroseconds
603 expires, this event is signaled. The BSP
604 can use the CheckEvent() or WaitForEvent()
605 services to check the state of event. Type
606 EFI_EVENT is defined in CreateEvent() in
607 the Unified Extensible Firmware Interface
609 @param[in] TimeoutInMicrosecsond Indicates the time limit in microseconds for
610 APs to return from Procedure, either for
611 blocking or non-blocking mode. Zero means
612 infinity. If the timeout expires before
613 all APs return from Procedure, then Procedure
614 on the failed APs is terminated. All enabled
615 APs are available for next function assigned
616 by EFI_MP_SERVICES_PROTOCOL.StartupAllAPs()
617 or EFI_MP_SERVICES_PROTOCOL.StartupThisAP().
618 If the timeout expires in blocking mode,
619 BSP returns EFI_TIMEOUT. If the timeout
620 expires in non-blocking mode, WaitEvent
621 is signaled with SignalEvent().
622 @param[in] ProcedureArgument The parameter passed into Procedure for
624 @param[out] Finished If NULL, this parameter is ignored. In
625 blocking mode, this parameter is ignored.
626 In non-blocking mode, if AP returns from
627 Procedure before the timeout expires, its
628 content is set to TRUE. Otherwise, the
629 value is set to FALSE. The caller can
630 determine if the AP returned from Procedure
631 by evaluating this value.
633 @retval EFI_SUCCESS In blocking mode, specified AP finished before
635 @retval EFI_SUCCESS In non-blocking mode, the function has been
636 dispatched to specified AP.
637 @retval EFI_UNSUPPORTED A non-blocking mode request was made after the
638 UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
640 @retval EFI_DEVICE_ERROR The calling processor is an AP.
641 @retval EFI_TIMEOUT In blocking mode, the timeout expired before
642 the specified AP has finished.
643 @retval EFI_NOT_READY The specified AP is busy.
644 @retval EFI_NOT_FOUND The processor with the handle specified by
645 ProcessorNumber does not exist.
646 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP or disabled AP.
647 @retval EFI_INVALID_PARAMETER Procedure is NULL.
652 CpuMpServicesStartupThisAP (
653 IN EFI_MP_SERVICES_PROTOCOL
*This
,
654 IN EFI_AP_PROCEDURE Procedure
,
655 IN UINTN ProcessorNumber
,
656 IN EFI_EVENT WaitEvent OPTIONAL
,
657 IN UINTN TimeoutInMicroseconds
,
658 IN VOID
*ProcedureArgument OPTIONAL
,
659 OUT BOOLEAN
*Finished OPTIONAL
665 return EFI_DEVICE_ERROR
;
668 if (Procedure
== NULL
) {
669 return EFI_INVALID_PARAMETER
;
672 if (ProcessorNumber
>= gMPSystem
.NumberOfProcessors
) {
673 return EFI_NOT_FOUND
;
676 if ((gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) != 0) {
677 return EFI_INVALID_PARAMETER
;
680 gThread
->MutexLock(gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
681 if (gMPSystem
.ProcessorData
[ProcessorNumber
].State
!= CPU_STATE_IDLE
) {
682 gThread
->MutexUnlock(gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
683 return EFI_NOT_READY
;
685 gThread
->MutexUnlock(gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
687 if ((WaitEvent
!= NULL
) && gReadToBoot
) {
688 return EFI_UNSUPPORTED
;
691 Timeout
= TimeoutInMicroseconds
;
693 gMPSystem
.StartCount
= 1;
694 gMPSystem
.FinishCount
= 0;
696 SetApProcedure (&gMPSystem
.ProcessorData
[ProcessorNumber
], Procedure
, ProcedureArgument
);
698 if (WaitEvent
!= NULL
) {
700 gMPSystem
.WaitEvent
= WaitEvent
;
702 gMPSystem
.ProcessorData
[ProcessorNumber
].CheckThisAPEvent
,
711 gThread
->MutexLock (gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
712 if (gMPSystem
.ProcessorData
[ProcessorNumber
].State
== CPU_STATE_FINISHED
) {
713 gMPSystem
.ProcessorData
[ProcessorNumber
].State
= CPU_STATE_IDLE
;
714 gThread
->MutexUnlock (gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
718 gThread
->MutexUnlock (gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
720 if ((TimeoutInMicroseconds
!= 0) && (Timeout
< 0)) {
724 gBS
->Stall (gPollInterval
);
725 Timeout
-= gPollInterval
;
734 This service switches the requested AP to be the BSP from that point onward.
735 This service changes the BSP for all purposes. This call can only be performed
738 This service switches the requested AP to be the BSP from that point onward.
739 This service changes the BSP for all purposes. The new BSP can take over the
740 execution of the old BSP and continue seamlessly from where the old one left
741 off. This service may not be supported after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT
744 If the BSP cannot be switched prior to the return from this service, then
745 EFI_UNSUPPORTED must be returned.
747 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.
748 @param[in] ProcessorNumber The handle number of AP that is to become the new
749 BSP. The range is from 0 to the total number of
750 logical processors minus 1. The total number of
751 logical processors can be retrieved by
752 EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().
753 @param[in] EnableOldBSP If TRUE, then the old BSP will be listed as an
754 enabled AP. Otherwise, it will be disabled.
756 @retval EFI_SUCCESS BSP successfully switched.
757 @retval EFI_UNSUPPORTED Switching the BSP cannot be completed prior to
758 this service returning.
759 @retval EFI_UNSUPPORTED Switching the BSP is not supported.
760 @retval EFI_SUCCESS The calling processor is an AP.
761 @retval EFI_NOT_FOUND The processor with the handle specified by
762 ProcessorNumber does not exist.
763 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the current BSP or
765 @retval EFI_NOT_READY The specified AP is busy.
770 CpuMpServicesSwitchBSP (
771 IN EFI_MP_SERVICES_PROTOCOL
*This
,
772 IN UINTN ProcessorNumber
,
773 IN BOOLEAN EnableOldBSP
779 return EFI_DEVICE_ERROR
;
782 if (ProcessorNumber
>= gMPSystem
.NumberOfProcessors
) {
783 return EFI_NOT_FOUND
;
786 if ((gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
& PROCESSOR_ENABLED_BIT
) == 0) {
787 return EFI_INVALID_PARAMETER
;
790 if ((gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) != 0) {
791 return EFI_INVALID_PARAMETER
;
794 for (Index
= 0; Index
< gMPSystem
.NumberOfProcessors
; Index
++) {
795 if ((gMPSystem
.ProcessorData
[Index
].Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) != 0) {
799 ASSERT (Index
!= gMPSystem
.NumberOfProcessors
);
801 gThread
->MutexLock (gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
802 if (gMPSystem
.ProcessorData
[ProcessorNumber
].State
!= CPU_STATE_IDLE
) {
803 gThread
->MutexUnlock (gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
804 return EFI_NOT_READY
;
806 gThread
->MutexUnlock (gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
808 // Skip for now as we need switch a bunch of stack stuff around and it's complex
809 // May not be worth it?
810 return EFI_NOT_READY
;
815 This service lets the caller enable or disable an AP from this point onward.
816 This service may only be called from the BSP.
818 This service allows the caller enable or disable an AP from this point onward.
819 The caller can optionally specify the health status of the AP by Health. If
820 an AP is being disabled, then the state of the disabled AP is implementation
821 dependent. If an AP is enabled, then the implementation must guarantee that a
822 complete initialization sequence is performed on the AP, so the AP is in a state
823 that is compatible with an MP operating system. This service may not be supported
824 after the UEFI Event EFI_EVENT_GROUP_READY_TO_BOOT is signaled.
826 If the enable or disable AP operation cannot be completed prior to the return
827 from this service, then EFI_UNSUPPORTED must be returned.
829 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.
830 @param[in] ProcessorNumber The handle number of AP that is to become the new
831 BSP. The range is from 0 to the total number of
832 logical processors minus 1. The total number of
833 logical processors can be retrieved by
834 EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().
835 @param[in] EnableAP Specifies the new state for the processor for
836 enabled, FALSE for disabled.
837 @param[in] HealthFlag If not NULL, a pointer to a value that specifies
838 the new health status of the AP. This flag
839 corresponds to StatusFlag defined in
840 EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only
841 the PROCESSOR_HEALTH_STATUS_BIT is used. All other
842 bits are ignored. If it is NULL, this parameter
845 @retval EFI_SUCCESS The specified AP was enabled or disabled successfully.
846 @retval EFI_UNSUPPORTED Enabling or disabling an AP cannot be completed
847 prior to this service returning.
848 @retval EFI_UNSUPPORTED Enabling or disabling an AP is not supported.
849 @retval EFI_DEVICE_ERROR The calling processor is an AP.
850 @retval EFI_NOT_FOUND Processor with the handle specified by ProcessorNumber
852 @retval EFI_INVALID_PARAMETER ProcessorNumber specifies the BSP.
857 CpuMpServicesEnableDisableAP (
858 IN EFI_MP_SERVICES_PROTOCOL
*This
,
859 IN UINTN ProcessorNumber
,
861 IN UINT32
*HealthFlag OPTIONAL
865 return EFI_DEVICE_ERROR
;
868 if (ProcessorNumber
>= gMPSystem
.NumberOfProcessors
) {
869 return EFI_NOT_FOUND
;
872 if ((gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) != 0) {
873 return EFI_INVALID_PARAMETER
;
876 gThread
->MutexLock (gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
877 if (gMPSystem
.ProcessorData
[ProcessorNumber
].State
!= CPU_STATE_IDLE
) {
878 gThread
->MutexUnlock (gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
879 return EFI_UNSUPPORTED
;
881 gThread
->MutexUnlock (gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
);
884 if ((gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
& PROCESSOR_ENABLED_BIT
) == 0 ) {
885 gMPSystem
.NumberOfEnabledProcessors
++;
887 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
|= PROCESSOR_ENABLED_BIT
;
889 if ((gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
& PROCESSOR_ENABLED_BIT
) == PROCESSOR_ENABLED_BIT
) {
890 gMPSystem
.NumberOfEnabledProcessors
--;
892 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
&= ~PROCESSOR_ENABLED_BIT
;
895 if (HealthFlag
!= NULL
) {
896 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
&= ~PROCESSOR_HEALTH_STATUS_BIT
;
897 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
|= (*HealthFlag
& PROCESSOR_HEALTH_STATUS_BIT
);
905 This return the handle number for the calling processor. This service may be
906 called from the BSP and APs.
908 This service returns the processor handle number for the calling processor.
909 The returned value is in the range from 0 to the total number of logical
910 processors minus 1. The total number of logical processors can be retrieved
911 with EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors(). This service may be
912 called from the BSP and APs. If ProcessorNumber is NULL, then EFI_INVALID_PARAMETER
913 is returned. Otherwise, the current processors handle number is returned in
914 ProcessorNumber, and EFI_SUCCESS is returned.
916 @param[in] This A pointer to the EFI_MP_SERVICES_PROTOCOL instance.
917 @param[in] ProcessorNumber The handle number of AP that is to become the new
918 BSP. The range is from 0 to the total number of
919 logical processors minus 1. The total number of
920 logical processors can be retrieved by
921 EFI_MP_SERVICES_PROTOCOL.GetNumberOfProcessors().
923 @retval EFI_SUCCESS The current processor handle number was returned
925 @retval EFI_INVALID_PARAMETER ProcessorNumber is NULL.
930 CpuMpServicesWhoAmI (
931 IN EFI_MP_SERVICES_PROTOCOL
*This
,
932 OUT UINTN
*ProcessorNumber
938 if (ProcessorNumber
== NULL
) {
939 return EFI_INVALID_PARAMETER
;
942 ProcessorId
= gThread
->Self ();
943 for (Index
= 0; Index
< gMPSystem
.NumberOfProcessors
; Index
++) {
944 if (gMPSystem
.ProcessorData
[Index
].Info
.ProcessorId
== ProcessorId
) {
949 *ProcessorNumber
= Index
;
955 EFI_MP_SERVICES_PROTOCOL mMpServicesTemplate
= {
956 CpuMpServicesGetNumberOfProcessors
,
957 CpuMpServicesGetProcessorInfo
,
958 CpuMpServicesStartupAllAps
,
959 CpuMpServicesStartupThisAP
,
960 CpuMpServicesSwitchBSP
,
961 CpuMpServicesEnableDisableAP
,
968 If timeout occurs in StartupAllAps(), a timer is set, which invokes this
969 procedure periodically to check whether all APs have finished.
975 CpuCheckAllAPsStatus (
980 UINTN ProcessorNumber
;
982 PROCESSOR_DATA_BLOCK
*ProcessorData
;
983 PROCESSOR_DATA_BLOCK
*NextData
;
985 PROCESSOR_STATE ProcessorState
;
989 if (gMPSystem
.TimeoutActive
) {
990 gMPSystem
.Timeout
-= gPollInterval
;
993 for (ProcessorNumber
= 0; ProcessorNumber
< gMPSystem
.NumberOfProcessors
; ProcessorNumber
++) {
994 ProcessorData
= &gMPSystem
.ProcessorData
[ProcessorNumber
];
995 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) == PROCESSOR_AS_BSP_BIT
) {
1000 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_ENABLED_BIT
) == 0) {
1001 // Skip Disabled processors
1005 // This is an Interrupt Service routine.
1006 // This can grab a lock that is held in a non-interrupt
1007 // context. Meaning deadlock. Which is a bad thing.
1008 // So, try lock it. If we can get it, cool, do our thing.
1009 // otherwise, just dump out & try again on the next iteration.
1010 Status
= gThread
->MutexTryLock (ProcessorData
->StateLock
);
1011 if (EFI_ERROR(Status
)) {
1014 ProcessorState
= ProcessorData
->State
;
1015 gThread
->MutexUnlock (ProcessorData
->StateLock
);
1017 switch (ProcessorState
) {
1018 case CPU_STATE_READY
:
1019 SetApProcedure (ProcessorData
, gMPSystem
.Procedure
, gMPSystem
.ProcedureArgument
);
1022 case CPU_STATE_FINISHED
:
1023 if (gMPSystem
.SingleThread
) {
1024 Status
= GetNextBlockedNumber (&NextNumber
);
1025 if (!EFI_ERROR (Status
)) {
1026 NextData
= &gMPSystem
.ProcessorData
[NextNumber
];
1028 gThread
->MutexLock (NextData
->StateLock
);
1029 NextData
->State
= CPU_STATE_READY
;
1030 gThread
->MutexUnlock (NextData
->StateLock
);
1032 SetApProcedure (NextData
, gMPSystem
.Procedure
, gMPSystem
.ProcedureArgument
);
1036 gThread
->MutexLock (ProcessorData
->StateLock
);
1037 ProcessorData
->State
= CPU_STATE_IDLE
;
1038 gThread
->MutexUnlock (ProcessorData
->StateLock
);
1039 gMPSystem
.FinishCount
++;
1047 if (gMPSystem
.TimeoutActive
&& gMPSystem
.Timeout
< 0) {
1051 if (gMPSystem
.FailedList
!= NULL
) {
1052 for (ProcessorNumber
= 0; ProcessorNumber
< gMPSystem
.NumberOfProcessors
; ProcessorNumber
++) {
1053 ProcessorData
= &gMPSystem
.ProcessorData
[ProcessorNumber
];
1054 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) == PROCESSOR_AS_BSP_BIT
) {
1059 if ((ProcessorData
->Info
.StatusFlag
& PROCESSOR_ENABLED_BIT
) == 0) {
1060 // Skip Disabled processors
1065 Status
= gThread
->MutexTryLock (ProcessorData
->StateLock
);
1066 if (EFI_ERROR(Status
)) {
1069 ProcessorState
= ProcessorData
->State
;
1070 gThread
->MutexUnlock (ProcessorData
->StateLock
);
1072 if (ProcessorState
!= CPU_STATE_IDLE
) {
1073 // If we are retrying make sure we don't double count
1074 for (Cpu
= 0, Found
= FALSE
; Cpu
< gMPSystem
.NumberOfProcessors
; Cpu
++) {
1075 if (gMPSystem
.FailedList
[Cpu
] == END_OF_CPU_LIST
) {
1078 if (gMPSystem
.FailedList
[ProcessorNumber
] == Cpu
) {
1084 gMPSystem
.FailedList
[gMPSystem
.FailedListIndex
++] = Cpu
;
1089 // Force terminal exit
1090 gMPSystem
.FinishCount
= gMPSystem
.StartCount
;
1093 if (gMPSystem
.FinishCount
!= gMPSystem
.StartCount
) {
1098 gMPSystem
.CheckAllAPsEvent
,
1103 if (gMPSystem
.FailedListIndex
== 0) {
1104 if (gMPSystem
.FailedList
!= NULL
) {
1105 FreePool (gMPSystem
.FailedList
);
1106 gMPSystem
.FailedList
= NULL
;
1110 Status
= gBS
->SignalEvent (gMPSystem
.WaitEvent
);
1117 CpuCheckThisAPStatus (
1123 PROCESSOR_DATA_BLOCK
*ProcessorData
;
1124 PROCESSOR_STATE ProcessorState
;
1126 ProcessorData
= (PROCESSOR_DATA_BLOCK
*) Context
;
1129 // This is an Interrupt Service routine.
1130 // that can grab a lock that is held in a non-interrupt
1131 // context. Meaning deadlock. Which is a badddd thing.
1132 // So, try lock it. If we can get it, cool, do our thing.
1133 // otherwise, just dump out & try again on the next iteration.
1135 Status
= gThread
->MutexTryLock (ProcessorData
->StateLock
);
1136 if (EFI_ERROR(Status
)) {
1139 ProcessorState
= ProcessorData
->State
;
1140 gThread
->MutexUnlock (ProcessorData
->StateLock
);
1142 if (ProcessorState
== CPU_STATE_FINISHED
) {
1143 Status
= gBS
->SetTimer (ProcessorData
->CheckThisAPEvent
, TimerCancel
, 0);
1144 ASSERT_EFI_ERROR (Status
);
1146 Status
= gBS
->SignalEvent (gMPSystem
.WaitEvent
);
1147 ASSERT_EFI_ERROR (Status
);
1149 gThread
->MutexLock (ProcessorData
->StateLock
);
1150 ProcessorData
->State
= CPU_STATE_IDLE
;
1151 gThread
->MutexUnlock (ProcessorData
->StateLock
);
1159 This function is called by all processors (both BSP and AP) once and collects MP related data
1161 MPSystemData - Pointer to the data structure containing MP related data
1162 BSP - TRUE if the CPU is BSP
1164 EFI_SUCCESS - Data for the processor collected and filled in
1168 FillInProcessorInformation (
1170 IN UINTN ProcessorNumber
1173 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.ProcessorId
= gThread
->Self ();
1174 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
= PROCESSOR_ENABLED_BIT
| PROCESSOR_HEALTH_STATUS_BIT
;
1176 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.StatusFlag
|= PROCESSOR_AS_BSP_BIT
;
1179 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.Location
.Package
= (UINT32
) ProcessorNumber
;
1180 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.Location
.Core
= 0;
1181 gMPSystem
.ProcessorData
[ProcessorNumber
].Info
.Location
.Thread
= 0;
1182 gMPSystem
.ProcessorData
[ProcessorNumber
].State
= BSP
? CPU_STATE_BUSY
: CPU_STATE_IDLE
;
1184 gMPSystem
.ProcessorData
[ProcessorNumber
].Procedure
= NULL
;
1185 gMPSystem
.ProcessorData
[ProcessorNumber
].Parameter
= NULL
;
1186 gMPSystem
.ProcessorData
[ProcessorNumber
].StateLock
= gThread
->MutexInit ();
1187 gMPSystem
.ProcessorData
[ProcessorNumber
].ProcedureLock
= gThread
->MutexInit ();
1194 CpuDriverApIdolLoop (
1198 EFI_AP_PROCEDURE Procedure
;
1200 UINTN ProcessorNumber
;
1201 PROCESSOR_DATA_BLOCK
*ProcessorData
;
1203 ProcessorNumber
= (UINTN
)Context
;
1204 ProcessorData
= &gMPSystem
.ProcessorData
[ProcessorNumber
];
1206 ProcessorData
->Info
.ProcessorId
= gThread
->Self ();
1210 // Make a local copy on the stack to be extra safe
1212 gThread
->MutexLock (ProcessorData
->ProcedureLock
);
1213 Procedure
= ProcessorData
->Procedure
;
1214 Parameter
= ProcessorData
->Parameter
;
1215 gThread
->MutexUnlock (ProcessorData
->ProcedureLock
);
1217 if (Procedure
!= NULL
) {
1218 gThread
->MutexLock (ProcessorData
->StateLock
);
1219 ProcessorData
->State
= CPU_STATE_BUSY
;
1220 gThread
->MutexUnlock (ProcessorData
->StateLock
);
1222 Procedure (Parameter
);
1224 gThread
->MutexLock (ProcessorData
->ProcedureLock
);
1225 ProcessorData
->Procedure
= NULL
;
1226 gThread
->MutexUnlock (ProcessorData
->ProcedureLock
);
1228 gThread
->MutexLock (ProcessorData
->StateLock
);
1229 ProcessorData
->State
= CPU_STATE_FINISHED
;
1230 gThread
->MutexUnlock (ProcessorData
->StateLock
);
1233 // Poll 5 times a seconds, 200ms
1234 // Don't want to burn too many system resources doing nothing.
1235 gEmuThunk
->Sleep (200 * 1000);
1243 InitializeMpSystemData (
1244 IN UINTN NumberOfProcessors
1252 // Clear the data structure area first.
1254 ZeroMem (&gMPSystem
, sizeof (MP_SYSTEM_DATA
));
1257 // First BSP fills and inits all known values, including it's own records.
1259 gMPSystem
.NumberOfProcessors
= NumberOfProcessors
;
1260 gMPSystem
.NumberOfEnabledProcessors
= NumberOfProcessors
;
1262 gMPSystem
.ProcessorData
= AllocateZeroPool (gMPSystem
.NumberOfProcessors
* sizeof (PROCESSOR_DATA_BLOCK
));
1263 ASSERT (gMPSystem
.ProcessorData
!= NULL
);
1265 FillInProcessorInformation (TRUE
, 0);
1267 Status
= gBS
->CreateEvent (
1268 EVT_TIMER
| EVT_NOTIFY_SIGNAL
,
1270 CpuCheckAllAPsStatus
,
1272 &gMPSystem
.CheckAllAPsEvent
1274 ASSERT_EFI_ERROR (Status
);
1277 for (Index
= 0; Index
< gMPSystem
.NumberOfProcessors
; Index
++) {
1278 if ((gMPSystem
.ProcessorData
[Index
].Info
.StatusFlag
& PROCESSOR_AS_BSP_BIT
) == PROCESSOR_AS_BSP_BIT
) {
1283 FillInProcessorInformation (FALSE
, Index
);
1285 Status
= gThread
->CreateThread (
1286 (VOID
*)&gMPSystem
.ProcessorData
[Index
].Info
.ProcessorId
,
1288 CpuDriverApIdolLoop
,
1293 Status
= gBS
->CreateEvent (
1294 EVT_TIMER
| EVT_NOTIFY_SIGNAL
,
1296 CpuCheckThisAPStatus
,
1297 (VOID
*) &gMPSystem
.ProcessorData
[Index
],
1298 &gMPSystem
.ProcessorData
[Index
].CheckThisAPEvent
1308 Invoke a notification event
1310 @param Event Event whose notification function is being invoked.
1311 @param Context The pointer to the notification function's context,
1312 which is implementation-dependent.
1317 CpuReadToBootFunction (
1334 EMU_IO_THUNK_PROTOCOL
*IoThunk
;
1336 *MaxCpus
= 1; // BSP
1337 IoThunk
= GetIoThunkInstance (&gEmuThreadThunkProtocolGuid
, 0);
1338 if (IoThunk
!= NULL
) {
1339 Status
= IoThunk
->Open (IoThunk
);
1340 if (!EFI_ERROR (Status
)) {
1341 if (IoThunk
->ConfigString
!= NULL
) {
1342 *MaxCpus
+= StrDecimalToUintn (IoThunk
->ConfigString
);
1343 gThread
= IoThunk
->Interface
;
1348 if (*MaxCpus
== 1) {
1349 // We are not MP so nothing to do
1353 gPollInterval
= (UINTN
) PcdGet64 (PcdEmuMpServicesPollingInterval
);
1355 Status
= InitializeMpSystemData (*MaxCpus
);
1356 if (EFI_ERROR (Status
)) {
1360 Status
= EfiCreateEventReadyToBootEx (TPL_CALLBACK
, CpuReadToBootFunction
, NULL
, &gReadToBootEvent
);
1361 ASSERT_EFI_ERROR (Status
);
1364 // Now install the MP services protocol.
1367 Status
= gBS
->InstallMultipleProtocolInterfaces (
1369 &gEfiMpServiceProtocolGuid
, &mMpServicesTemplate
,