UefiCpuPkg/Library/MpInitLib/DxeMpLib.c

   1 /** @file
   2   MP initialize support functions for DXE phase.
   3
   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
   9
  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.
  12
  13 **/
  14
  15 #include "MpLib.h"
  16
  17 #include <Library/UefiLib.h>
  18 #include <Library/UefiBootServicesTableLib.h>
  19
  20 #define  AP_CHECK_INTERVAL     (EFI_TIMER_PERIOD_MILLISECONDS (100))
  21
  22 CPU_MP_DATA      *mCpuMpData = NULL;
  23 EFI_EVENT        mCheckAllApsEvent = NULL;
  24 EFI_EVENT        mMpInitExitBootServicesEvent = NULL;
  25 volatile BOOLEAN mStopCheckAllApsStatus = TRUE;
  26
  27
  28 /**
  29   Get the pointer to CPU MP Data structure.
  30
  31   @return  The pointer to CPU MP Data structure.
  32 **/
  33 CPU_MP_DATA *
  34 GetCpuMpData (
  35   VOID
  36   )
  37 {
  38   ASSERT (mCpuMpData != NULL);
  39   return mCpuMpData;
  40 }
  41
  42 /**
  43   Save the pointer to CPU MP Data structure.
  44
  45   @param[in] CpuMpData  The pointer to CPU MP Data structure will be saved.
  46 **/
  47 VOID
  48 SaveCpuMpData (
  49   IN CPU_MP_DATA   *CpuMpData
  50   )
  51 {
  52   mCpuMpData = CpuMpData;
  53 }
  54
  55 /**
  56   Allocate reset vector buffer.
  57
  58   @param[in, out]  CpuMpData  The pointer to CPU MP Data structure.
  59 **/
  60 VOID
  61 AllocateResetVector (
  62   IN OUT CPU_MP_DATA          *CpuMpData
  63   )
  64 {
  65   EFI_STATUS            Status;
  66   UINTN                 ApResetVectorSize;
  67   EFI_PHYSICAL_ADDRESS  StartAddress;
  68
  69   ApResetVectorSize = CpuMpData->AddressMap.RendezvousFunnelSize +
  70                       sizeof (MP_CPU_EXCHANGE_INFO);
  71
  72   StartAddress = BASE_1MB;
  73   Status = gBS->AllocatePages (
  74                   AllocateMaxAddress,
  75                   EfiACPIMemoryNVS,
  76                   EFI_SIZE_TO_PAGES (ApResetVectorSize),
  77                   &StartAddress
  78                   );
  79   ASSERT_EFI_ERROR (Status);
  80
  81   CpuMpData->WakeupBuffer      = (UINTN) StartAddress;
  82   CpuMpData->MpCpuExchangeInfo = (MP_CPU_EXCHANGE_INFO *) (UINTN)
  83                   (CpuMpData->WakeupBuffer + CpuMpData->AddressMap.RendezvousFunnelSize);
  84   //
  85   // copy AP reset code in it
  86   //
  87   CopyMem (
  88     (VOID *) CpuMpData->WakeupBuffer,
  89     (VOID *) CpuMpData->AddressMap.RendezvousFunnelAddress,
  90     CpuMpData->AddressMap.RendezvousFunnelSize
  91     );
  92 }
  93
  94 /**
  95   Free AP reset vector buffer.
  96
  97   @param[in]  CpuMpData  The pointer to CPU MP Data structure.
  98 **/
  99 VOID
 100 FreeResetVector (
 101   IN CPU_MP_DATA              *CpuMpData
 102   )
 103 {
 104   EFI_STATUS            Status;
 105   UINTN                 ApResetVectorSize;
 106   ApResetVectorSize = CpuMpData->AddressMap.RendezvousFunnelSize +
 107                       sizeof (MP_CPU_EXCHANGE_INFO);
 108   Status = gBS->FreePages(
 109              (EFI_PHYSICAL_ADDRESS)CpuMpData->WakeupBuffer,
 110              EFI_SIZE_TO_PAGES (ApResetVectorSize)
 111              );
 112   ASSERT_EFI_ERROR (Status);
 113 }
 114
 115 /**
 116   Checks APs status and updates APs status if needed.
 117
 118 **/
 119 VOID
 120 CheckAndUpdateApsStatus (
 121   VOID
 122   )
 123 {
 124   UINTN                   ProcessorNumber;
 125   EFI_STATUS              Status;
 126   CPU_MP_DATA             *CpuMpData;
 127
 128   CpuMpData = GetCpuMpData ();
 129
 130   //
 131   // First, check whether pending StartupAllAPs() exists.
 132   //
 133   if (CpuMpData->WaitEvent != NULL) {
 134
 135     Status = CheckAllAPs ();
 136     //
 137     // If all APs finish for StartupAllAPs(), signal the WaitEvent for it.
 138     //
 139     if (Status != EFI_NOT_READY) {
 140       Status = gBS->SignalEvent (CpuMpData->WaitEvent);
 141       CpuMpData->WaitEvent = NULL;
 142     }
 143   }
 144
 145   //
 146   // Second, check whether pending StartupThisAPs() callings exist.
 147   //
 148   for (ProcessorNumber = 0; ProcessorNumber < CpuMpData->CpuCount; ProcessorNumber++) {
 149
 150     if (CpuMpData->CpuData[ProcessorNumber].WaitEvent == NULL) {
 151       continue;
 152     }
 153
 154     Status = CheckThisAP (ProcessorNumber);
 155
 156     if (Status != EFI_NOT_READY) {
 157       gBS->SignalEvent (CpuMpData->CpuData[ProcessorNumber].WaitEvent);
 158      CpuMpData->CpuData[ProcessorNumber].WaitEvent = NULL;
 159     }
 160   }
 161 }
 162
 163 /**
 164   Checks APs' status periodically.
 165
 166   This function is triggerred by timer perodically to check the
 167   state of APs for StartupAllAPs() and StartupThisAP() executed
 168   in non-blocking mode.
 169
 170   @param[in]  Event    Event triggered.
 171   @param[in]  Context  Parameter passed with the event.
 172
 173 **/
 174 VOID
 175 EFIAPI
 176 CheckApsStatus (
 177   IN  EFI_EVENT                           Event,
 178   IN  VOID                                *Context
 179   )
 180 {
 181   //
 182   // If CheckApsStatus() is not stopped, otherwise return immediately.
 183   //
 184   if (!mStopCheckAllApsStatus) {
 185     CheckAndUpdateApsStatus ();
 186   }
 187 }
 188
 189 /**
 190   Get Protected mode code segment from current GDT table.
 191
 192   @returen  Protected mode code segment value.
 193 **/
 194 UINT16
 195 GetProtectedModeCS (
 196   VOID
 197   )
 198 {
 199   IA32_DESCRIPTOR          GdtrDesc;
 200   IA32_SEGMENT_DESCRIPTOR  *GdtEntry;
 201   UINTN                    GdtEntryCount;
 202   UINT16                   Index;
 203
 204   Index = (UINT16) -1;
 205   AsmReadGdtr (&GdtrDesc);
 206   GdtEntryCount = (GdtrDesc.Limit + 1) / sizeof (IA32_SEGMENT_DESCRIPTOR);
 207   GdtEntry = (IA32_SEGMENT_DESCRIPTOR *) GdtrDesc.Base;
 208   for (Index = 0; Index < GdtEntryCount; Index++) {
 209     if (GdtEntry->Bits.L == 0) {
 210       if (GdtEntry->Bits.Type > 8 && GdtEntry->Bits.L == 0) {
 211         break;
 212       }
 213     }
 214     GdtEntry++;
 215   }
 216   ASSERT (Index != -1);
 217   return Index * 8;
 218 }
 219
 220 /**
 221   Do sync on APs.
 222
 223   @param[in, out] Buffer  Pointer to private data buffer.
 224 **/
 225 VOID
 226 EFIAPI
 227 RelocateApLoop (
 228   IN OUT VOID  *Buffer
 229   )
 230 {
 231   CPU_MP_DATA            *CpuMpData;
 232   BOOLEAN                MwaitSupport;
 233   ASM_RELOCATE_AP_LOOP   AsmRelocateApLoopFunc;
 234
 235   CpuMpData    = GetCpuMpData ();
 236   MwaitSupport = IsMwaitSupport ();
 237   AsmRelocateApLoopFunc = (ASM_RELOCATE_AP_LOOP) (UINTN) Buffer;
 238   AsmRelocateApLoopFunc (MwaitSupport, CpuMpData->ApTargetCState, CpuMpData->PmCodeSegment);
 239   //
 240   // It should never reach here
 241   //
 242   ASSERT (FALSE);
 243 }
 244
 245 /**
 246   Callback function for ExitBootServices.
 247
 248   @param[in]  Event             Event whose notification function is being invoked.
 249   @param[in]  Context           The pointer to the notification function's context,
 250                                 which is implementation-dependent.
 251
 252 **/
 253 VOID
 254 EFIAPI
 255 MpInitExitBootServicesCallback (
 256   IN EFI_EVENT                Event,
 257   IN VOID                     *Context
 258   )
 259 {
 260   CPU_MP_DATA               *CpuMpData;
 261   VOID                      *ReservedApLoopFunc;
 262   //
 263   // Avoid APs access invalid buff data which allocated by BootServices,
 264   // so we will allocate reserved data for AP loop code.
 265   //
 266   CpuMpData = GetCpuMpData ();
 267   CpuMpData->PmCodeSegment = GetProtectedModeCS ();
 268   CpuMpData->ApLoopMode = PcdGet8 (PcdCpuApLoopMode);
 269   ReservedApLoopFunc = AllocateReservedCopyPool (
 270                          CpuMpData->AddressMap.RelocateApLoopFuncSize,
 271                          CpuMpData->AddressMap.RelocateApLoopFuncAddress
 272                          );
 273   WakeUpAP (CpuMpData, TRUE, 0, RelocateApLoop, ReservedApLoopFunc);
 274   DEBUG ((DEBUG_INFO, "MpInitExitBootServicesCallback() done!\n"));
 275 }
 276
 277 /**
 278   Initialize global data for MP support.
 279
 280   @param[in] CpuMpData  The pointer to CPU MP Data structure.
 281 **/
 282 VOID
 283 InitMpGlobalData (
 284   IN CPU_MP_DATA               *CpuMpData
 285   )
 286 {
 287   EFI_STATUS     Status;
 288
 289   SaveCpuMpData (CpuMpData);
 290
 291   Status = gBS->CreateEvent (
 292                   EVT_TIMER | EVT_NOTIFY_SIGNAL,
 293                   TPL_NOTIFY,
 294                   CheckApsStatus,
 295                   NULL,
 296                   &mCheckAllApsEvent
 297                   );
 298   ASSERT_EFI_ERROR (Status);
 299
 300   //
 301   // Set timer to check all APs status.
 302   //
 303   Status = gBS->SetTimer (
 304                   mCheckAllApsEvent,
 305                   TimerPeriodic,
 306                   AP_CHECK_INTERVAL
 307                   );
 308   ASSERT_EFI_ERROR (Status);
 309   Status = gBS->CreateEvent (
 310                   EVT_SIGNAL_EXIT_BOOT_SERVICES,
 311                   TPL_CALLBACK,
 312                   MpInitExitBootServicesCallback,
 313                   NULL,
 314                   &mMpInitExitBootServicesEvent
 315                   );
 316   ASSERT_EFI_ERROR (Status);
 317 }
 318
 319 /**
 320   This service executes a caller provided function on all enabled APs.
 321
 322   @param[in]  Procedure               A pointer to the function to be run on
 323                                       enabled APs of the system. See type
 324                                       EFI_AP_PROCEDURE.
 325   @param[in]  SingleThread            If TRUE, then all the enabled APs execute
 326                                       the function specified by Procedure one by
 327                                       one, in ascending order of processor handle
 328                                       number.  If FALSE, then all the enabled APs
 329                                       execute the function specified by Procedure
 330                                       simultaneously.
 331   @param[in]  WaitEvent               The event created by the caller with CreateEvent()
 332                                       service.  If it is NULL, then execute in
 333                                       blocking mode. BSP waits until all APs finish
 334                                       or TimeoutInMicroSeconds expires.  If it's
 335                                       not NULL, then execute in non-blocking mode.
 336                                       BSP requests the function specified by
 337                                       Procedure to be started on all the enabled
 338                                       APs, and go on executing immediately. If
 339                                       all return from Procedure, or TimeoutInMicroSeconds
 340                                       expires, this event is signaled. The BSP
 341                                       can use the CheckEvent() or WaitForEvent()
 342                                       services to check the state of event.  Type
 343                                       EFI_EVENT is defined in CreateEvent() in
 344                                       the Unified Extensible Firmware Interface
 345                                       Specification.
 346   @param[in]  TimeoutInMicrosecsond   Indicates the time limit in microseconds for
 347                                       APs to return from Procedure, either for
 348                                       blocking or non-blocking mode. Zero means
 349                                       infinity.  If the timeout expires before
 350                                       all APs return from Procedure, then Procedure
 351                                       on the failed APs is terminated. All enabled
 352                                       APs are available for next function assigned
 353                                       by MpInitLibStartupAllAPs() or
 354                                       MPInitLibStartupThisAP().
 355                                       If the timeout expires in blocking mode,
 356                                       BSP returns EFI_TIMEOUT.  If the timeout
 357                                       expires in non-blocking mode, WaitEvent
 358                                       is signaled with SignalEvent().
 359   @param[in]  ProcedureArgument       The parameter passed into Procedure for
 360                                       all APs.
 361   @param[out] FailedCpuList           If NULL, this parameter is ignored. Otherwise,
 362                                       if all APs finish successfully, then its
 363                                       content is set to NULL. If not all APs
 364                                       finish before timeout expires, then its
 365                                       content is set to address of the buffer
 366                                       holding handle numbers of the failed APs.
 367                                       The buffer is allocated by MP Initialization
 368                                       library, and it's the caller's responsibility to
 369                                       free the buffer with FreePool() service.
 370                                       In blocking mode, it is ready for consumption
 371                                       when the call returns. In non-blocking mode,
 372                                       it is ready when WaitEvent is signaled.  The
 373                                       list of failed CPU is terminated by
 374                                       END_OF_CPU_LIST.
 375
 376   @retval EFI_SUCCESS             In blocking mode, all APs have finished before
 377                                   the timeout expired.
 378   @retval EFI_SUCCESS             In non-blocking mode, function has been dispatched
 379                                   to all enabled APs.
 380   @retval EFI_UNSUPPORTED         A non-blocking mode request was made after the
 381                                   UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
 382                                   signaled.
 383   @retval EFI_UNSUPPORTED         WaitEvent is not NULL if non-blocking mode is not
 384                                   supported.
 385   @retval EFI_DEVICE_ERROR        Caller processor is AP.
 386   @retval EFI_NOT_STARTED         No enabled APs exist in the system.
 387   @retval EFI_NOT_READY           Any enabled APs are busy.
 388   @retval EFI_NOT_READY           MP Initialize Library is not initialized.
 389   @retval EFI_TIMEOUT             In blocking mode, the timeout expired before
 390                                   all enabled APs have finished.
 391   @retval EFI_INVALID_PARAMETER   Procedure is NULL.
 392
 393 **/
 394 EFI_STATUS
 395 EFIAPI
 396 MpInitLibStartupAllAPs (
 397   IN  EFI_AP_PROCEDURE          Procedure,
 398   IN  BOOLEAN                   SingleThread,
 399   IN  EFI_EVENT                 WaitEvent               OPTIONAL,
 400   IN  UINTN                     TimeoutInMicroseconds,
 401   IN  VOID                      *ProcedureArgument      OPTIONAL,
 402   OUT UINTN                     **FailedCpuList         OPTIONAL
 403   )
 404 {
 405   EFI_STATUS              Status;
 406
 407   //
 408   // Temporarily stop checkAllApsStatus for avoid resource dead-lock.
 409   //
 410   mStopCheckAllApsStatus = TRUE;
 411
 412   Status = StartupAllAPsWorker (
 413              Procedure,
 414              SingleThread,
 415              WaitEvent,
 416              TimeoutInMicroseconds,
 417              ProcedureArgument,
 418              FailedCpuList
 419              );
 420
 421   //
 422   // Start checkAllApsStatus
 423   //
 424   mStopCheckAllApsStatus = FALSE;
 425
 426   return Status;
 427 }
 428
 429 /**
 430   This service lets the caller get one enabled AP to execute a caller-provided
 431   function.
 432
 433   @param[in]  Procedure               A pointer to the function to be run on the
 434                                       designated AP of the system. See type
 435                                       EFI_AP_PROCEDURE.
 436   @param[in]  ProcessorNumber         The handle number of the AP. The range is
 437                                       from 0 to the total number of logical
 438                                       processors minus 1. The total number of
 439                                       logical processors can be retrieved by
 440                                       MpInitLibGetNumberOfProcessors().
 441   @param[in]  WaitEvent               The event created by the caller with CreateEvent()
 442                                       service.  If it is NULL, then execute in
 443                                       blocking mode. BSP waits until this AP finish
 444                                       or TimeoutInMicroSeconds expires.  If it's
 445                                       not NULL, then execute in non-blocking mode.
 446                                       BSP requests the function specified by
 447                                       Procedure to be started on this AP,
 448                                       and go on executing immediately. If this AP
 449                                       return from Procedure or TimeoutInMicroSeconds
 450                                       expires, this event is signaled. The BSP
 451                                       can use the CheckEvent() or WaitForEvent()
 452                                       services to check the state of event.  Type
 453                                       EFI_EVENT is defined in CreateEvent() in
 454                                       the Unified Extensible Firmware Interface
 455                                       Specification.
 456   @param[in]  TimeoutInMicrosecsond   Indicates the time limit in microseconds for
 457                                       this AP to finish this Procedure, either for
 458                                       blocking or non-blocking mode. Zero means
 459                                       infinity.  If the timeout expires before
 460                                       this AP returns from Procedure, then Procedure
 461                                       on the AP is terminated. The
 462                                       AP is available for next function assigned
 463                                       by MpInitLibStartupAllAPs() or
 464                                       MpInitLibStartupThisAP().
 465                                       If the timeout expires in blocking mode,
 466                                       BSP returns EFI_TIMEOUT.  If the timeout
 467                                       expires in non-blocking mode, WaitEvent
 468                                       is signaled with SignalEvent().
 469   @param[in]  ProcedureArgument       The parameter passed into Procedure on the
 470                                       specified AP.
 471   @param[out] Finished                If NULL, this parameter is ignored.  In
 472                                       blocking mode, this parameter is ignored.
 473                                       In non-blocking mode, if AP returns from
 474                                       Procedure before the timeout expires, its
 475                                       content is set to TRUE. Otherwise, the
 476                                       value is set to FALSE. The caller can
 477                                       determine if the AP returned from Procedure
 478                                       by evaluating this value.
 479
 480   @retval EFI_SUCCESS             In blocking mode, specified AP finished before
 481                                   the timeout expires.
 482   @retval EFI_SUCCESS             In non-blocking mode, the function has been
 483                                   dispatched to specified AP.
 484   @retval EFI_UNSUPPORTED         A non-blocking mode request was made after the
 485                                   UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
 486                                   signaled.
 487   @retval EFI_UNSUPPORTED         WaitEvent is not NULL if non-blocking mode is not
 488                                   supported.
 489   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
 490   @retval EFI_TIMEOUT             In blocking mode, the timeout expired before
 491                                   the specified AP has finished.
 492   @retval EFI_NOT_READY           The specified AP is busy.
 493   @retval EFI_NOT_READY           MP Initialize Library is not initialized.
 494   @retval EFI_NOT_FOUND           The processor with the handle specified by
 495                                   ProcessorNumber does not exist.
 496   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the BSP or disabled AP.
 497   @retval EFI_INVALID_PARAMETER   Procedure is NULL.
 498
 499 **/
 500 EFI_STATUS
 501 EFIAPI
 502 MpInitLibStartupThisAP (
 503   IN  EFI_AP_PROCEDURE          Procedure,
 504   IN  UINTN                     ProcessorNumber,
 505   IN  EFI_EVENT                 WaitEvent               OPTIONAL,
 506   IN  UINTN                     TimeoutInMicroseconds,
 507   IN  VOID                      *ProcedureArgument      OPTIONAL,
 508   OUT BOOLEAN                   *Finished               OPTIONAL
 509   )
 510 {
 511   EFI_STATUS              Status;
 512
 513   //
 514   // temporarily stop checkAllApsStatus for avoid resource dead-lock.
 515   //
 516   mStopCheckAllApsStatus = TRUE;
 517
 518   Status = StartupThisAPWorker (
 519              Procedure,
 520              ProcessorNumber,
 521              WaitEvent,
 522              TimeoutInMicroseconds,
 523              ProcedureArgument,
 524              Finished
 525              );
 526
 527   mStopCheckAllApsStatus = FALSE;
 528
 529   return Status;
 530 }
 531
 532 /**
 533   This service switches the requested AP to be the BSP from that point onward.
 534   This service changes the BSP for all purposes. This call can only be performed
 535   by the current BSP.
 536
 537   @param[in] ProcessorNumber   The handle number of AP that is to become the new
 538                                BSP. The range is from 0 to the total number of
 539                                logical processors minus 1. The total number of
 540                                logical processors can be retrieved by
 541                                MpInitLibGetNumberOfProcessors().
 542   @param[in] EnableOldBSP      If TRUE, then the old BSP will be listed as an
 543                                enabled AP. Otherwise, it will be disabled.
 544
 545   @retval EFI_SUCCESS             BSP successfully switched.
 546   @retval EFI_UNSUPPORTED         Switching the BSP cannot be completed prior to
 547                                   this service returning.
 548   @retval EFI_UNSUPPORTED         Switching the BSP is not supported.
 549   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
 550   @retval EFI_NOT_FOUND           The processor with the handle specified by
 551                                   ProcessorNumber does not exist.
 552   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the current BSP or
 553                                   a disabled AP.
 554   @retval EFI_NOT_READY           The specified AP is busy.
 555   @retval EFI_NOT_READY           MP Initialize Library is not initialized.
 556
 557 **/
 558 EFI_STATUS
 559 EFIAPI
 560 MpInitLibSwitchBSP (
 561   IN UINTN                     ProcessorNumber,
 562   IN BOOLEAN                   EnableOldBSP
 563   )
 564 {
 565   EFI_STATUS            Status;
 566   BOOLEAN               OldInterruptState;
 567
 568   //
 569   // Before send both BSP and AP to a procedure to exchange their roles,
 570   // interrupt must be disabled. This is because during the exchange role
 571   // process, 2 CPU may use 1 stack. If interrupt happens, the stack will
 572   // be corrupted, since interrupt return address will be pushed to stack
 573   // by hardware.
 574   //
 575   OldInterruptState = SaveAndDisableInterrupts ();
 576
 577   //
 578   // Mask LINT0 & LINT1 for the old BSP
 579   //
 580   DisableLvtInterrupts ();
 581
 582   Status = SwitchBSPWorker (ProcessorNumber, EnableOldBSP);
 583
 584   //
 585   // Restore interrupt state.
 586   //
 587   SetInterruptState (OldInterruptState);
 588
 589   return Status;
 590 }
 591
 592 /**
 593   This service lets the caller enable or disable an AP from this point onward.
 594   This service may only be called from the BSP.
 595
 596   @param[in] ProcessorNumber   The handle number of AP.
 597                                The range is from 0 to the total number of
 598                                logical processors minus 1. The total number of
 599                                logical processors can be retrieved by
 600                                MpInitLibGetNumberOfProcessors().
 601   @param[in] EnableAP          Specifies the new state for the processor for
 602                                enabled, FALSE for disabled.
 603   @param[in] HealthFlag        If not NULL, a pointer to a value that specifies
 604                                the new health status of the AP. This flag
 605                                corresponds to StatusFlag defined in
 606                                EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only
 607                                the PROCESSOR_HEALTH_STATUS_BIT is used. All other
 608                                bits are ignored.  If it is NULL, this parameter
 609                                is ignored.
 610
 611   @retval EFI_SUCCESS             The specified AP was enabled or disabled successfully.
 612   @retval EFI_UNSUPPORTED         Enabling or disabling an AP cannot be completed
 613                                   prior to this service returning.
 614   @retval EFI_UNSUPPORTED         Enabling or disabling an AP is not supported.
 615   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
 616   @retval EFI_NOT_FOUND           Processor with the handle specified by ProcessorNumber
 617                                   does not exist.
 618   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the BSP.
 619   @retval EFI_NOT_READY           MP Initialize Library is not initialized.
 620
 621 **/
 622 EFI_STATUS
 623 EFIAPI
 624 MpInitLibEnableDisableAP (
 625   IN  UINTN                     ProcessorNumber,
 626   IN  BOOLEAN                   EnableAP,
 627   IN  UINT32                    *HealthFlag OPTIONAL
 628   )
 629 {
 630   EFI_STATUS     Status;
 631   BOOLEAN        TempStopCheckState;
 632
 633   TempStopCheckState = FALSE;
 634   //
 635   // temporarily stop checkAllAPsStatus for initialize parameters.
 636   //
 637   if (!mStopCheckAllApsStatus) {
 638     mStopCheckAllApsStatus = TRUE;
 639     TempStopCheckState     = TRUE;
 640   }
 641
 642   Status = EnableDisableApWorker (ProcessorNumber, EnableAP, HealthFlag);
 643
 644   if (TempStopCheckState) {
 645     mStopCheckAllApsStatus = FALSE;
 646   }
 647
 648   return Status;
 649 }