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 VOID             *mReservedApLoopFunc = NULL;
  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   @return  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
 262   CpuMpData = GetCpuMpData ();
 263   CpuMpData->PmCodeSegment = GetProtectedModeCS ();
 264   CpuMpData->ApLoopMode = PcdGet8 (PcdCpuApLoopMode);
 265   WakeUpAP (CpuMpData, TRUE, 0, RelocateApLoop, mReservedApLoopFunc);
 266   DEBUG ((DEBUG_INFO, "MpInitExitBootServicesCallback() done!\n"));
 267 }
 268
 269 /**
 270   Initialize global data for MP support.
 271
 272   @param[in] CpuMpData  The pointer to CPU MP Data structure.
 273 **/
 274 VOID
 275 InitMpGlobalData (
 276   IN CPU_MP_DATA               *CpuMpData
 277   )
 278 {
 279   EFI_STATUS     Status;
 280
 281   SaveCpuMpData (CpuMpData);
 282
 283   //
 284   // Avoid APs access invalid buff data which allocated by BootServices,
 285   // so we will allocate reserved data for AP loop code.
 286   // Allocating it in advance since memory services are not available in
 287   // Exit Boot Services callback function.
 288   //
 289   mReservedApLoopFunc = AllocateReservedCopyPool (
 290                           CpuMpData->AddressMap.RelocateApLoopFuncSize,
 291                           CpuMpData->AddressMap.RelocateApLoopFuncAddress
 292                           );
 293   ASSERT (mReservedApLoopFunc != NULL);
 294
 295   Status = gBS->CreateEvent (
 296                   EVT_TIMER | EVT_NOTIFY_SIGNAL,
 297                   TPL_NOTIFY,
 298                   CheckApsStatus,
 299                   NULL,
 300                   &mCheckAllApsEvent
 301                   );
 302   ASSERT_EFI_ERROR (Status);
 303
 304   //
 305   // Set timer to check all APs status.
 306   //
 307   Status = gBS->SetTimer (
 308                   mCheckAllApsEvent,
 309                   TimerPeriodic,
 310                   AP_CHECK_INTERVAL
 311                   );
 312   ASSERT_EFI_ERROR (Status);
 313   Status = gBS->CreateEvent (
 314                   EVT_SIGNAL_EXIT_BOOT_SERVICES,
 315                   TPL_CALLBACK,
 316                   MpInitExitBootServicesCallback,
 317                   NULL,
 318                   &mMpInitExitBootServicesEvent
 319                   );
 320   ASSERT_EFI_ERROR (Status);
 321 }
 322
 323 /**
 324   This service executes a caller provided function on all enabled APs.
 325
 326   @param[in]  Procedure               A pointer to the function to be run on
 327                                       enabled APs of the system. See type
 328                                       EFI_AP_PROCEDURE.
 329   @param[in]  SingleThread            If TRUE, then all the enabled APs execute
 330                                       the function specified by Procedure one by
 331                                       one, in ascending order of processor handle
 332                                       number.  If FALSE, then all the enabled APs
 333                                       execute the function specified by Procedure
 334                                       simultaneously.
 335   @param[in]  WaitEvent               The event created by the caller with CreateEvent()
 336                                       service.  If it is NULL, then execute in
 337                                       blocking mode. BSP waits until all APs finish
 338                                       or TimeoutInMicroSeconds expires.  If it's
 339                                       not NULL, then execute in non-blocking mode.
 340                                       BSP requests the function specified by
 341                                       Procedure to be started on all the enabled
 342                                       APs, and go on executing immediately. If
 343                                       all return from Procedure, or TimeoutInMicroSeconds
 344                                       expires, this event is signaled. The BSP
 345                                       can use the CheckEvent() or WaitForEvent()
 346                                       services to check the state of event.  Type
 347                                       EFI_EVENT is defined in CreateEvent() in
 348                                       the Unified Extensible Firmware Interface
 349                                       Specification.
 350   @param[in]  TimeoutInMicrosecsond   Indicates the time limit in microseconds for
 351                                       APs to return from Procedure, either for
 352                                       blocking or non-blocking mode. Zero means
 353                                       infinity.  If the timeout expires before
 354                                       all APs return from Procedure, then Procedure
 355                                       on the failed APs is terminated. All enabled
 356                                       APs are available for next function assigned
 357                                       by MpInitLibStartupAllAPs() or
 358                                       MPInitLibStartupThisAP().
 359                                       If the timeout expires in blocking mode,
 360                                       BSP returns EFI_TIMEOUT.  If the timeout
 361                                       expires in non-blocking mode, WaitEvent
 362                                       is signaled with SignalEvent().
 363   @param[in]  ProcedureArgument       The parameter passed into Procedure for
 364                                       all APs.
 365   @param[out] FailedCpuList           If NULL, this parameter is ignored. Otherwise,
 366                                       if all APs finish successfully, then its
 367                                       content is set to NULL. If not all APs
 368                                       finish before timeout expires, then its
 369                                       content is set to address of the buffer
 370                                       holding handle numbers of the failed APs.
 371                                       The buffer is allocated by MP Initialization
 372                                       library, and it's the caller's responsibility to
 373                                       free the buffer with FreePool() service.
 374                                       In blocking mode, it is ready for consumption
 375                                       when the call returns. In non-blocking mode,
 376                                       it is ready when WaitEvent is signaled.  The
 377                                       list of failed CPU is terminated by
 378                                       END_OF_CPU_LIST.
 379
 380   @retval EFI_SUCCESS             In blocking mode, all APs have finished before
 381                                   the timeout expired.
 382   @retval EFI_SUCCESS             In non-blocking mode, function has been dispatched
 383                                   to all enabled APs.
 384   @retval EFI_UNSUPPORTED         A non-blocking mode request was made after the
 385                                   UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
 386                                   signaled.
 387   @retval EFI_UNSUPPORTED         WaitEvent is not NULL if non-blocking mode is not
 388                                   supported.
 389   @retval EFI_DEVICE_ERROR        Caller processor is AP.
 390   @retval EFI_NOT_STARTED         No enabled APs exist in the system.
 391   @retval EFI_NOT_READY           Any enabled APs are busy.
 392   @retval EFI_NOT_READY           MP Initialize Library is not initialized.
 393   @retval EFI_TIMEOUT             In blocking mode, the timeout expired before
 394                                   all enabled APs have finished.
 395   @retval EFI_INVALID_PARAMETER   Procedure is NULL.
 396
 397 **/
 398 EFI_STATUS
 399 EFIAPI
 400 MpInitLibStartupAllAPs (
 401   IN  EFI_AP_PROCEDURE          Procedure,
 402   IN  BOOLEAN                   SingleThread,
 403   IN  EFI_EVENT                 WaitEvent               OPTIONAL,
 404   IN  UINTN                     TimeoutInMicroseconds,
 405   IN  VOID                      *ProcedureArgument      OPTIONAL,
 406   OUT UINTN                     **FailedCpuList         OPTIONAL
 407   )
 408 {
 409   EFI_STATUS              Status;
 410
 411   //
 412   // Temporarily stop checkAllApsStatus for avoid resource dead-lock.
 413   //
 414   mStopCheckAllApsStatus = TRUE;
 415
 416   Status = StartupAllAPsWorker (
 417              Procedure,
 418              SingleThread,
 419              WaitEvent,
 420              TimeoutInMicroseconds,
 421              ProcedureArgument,
 422              FailedCpuList
 423              );
 424
 425   //
 426   // Start checkAllApsStatus
 427   //
 428   mStopCheckAllApsStatus = FALSE;
 429
 430   return Status;
 431 }
 432
 433 /**
 434   This service lets the caller get one enabled AP to execute a caller-provided
 435   function.
 436
 437   @param[in]  Procedure               A pointer to the function to be run on the
 438                                       designated AP of the system. See type
 439                                       EFI_AP_PROCEDURE.
 440   @param[in]  ProcessorNumber         The handle number of the AP. The range is
 441                                       from 0 to the total number of logical
 442                                       processors minus 1. The total number of
 443                                       logical processors can be retrieved by
 444                                       MpInitLibGetNumberOfProcessors().
 445   @param[in]  WaitEvent               The event created by the caller with CreateEvent()
 446                                       service.  If it is NULL, then execute in
 447                                       blocking mode. BSP waits until this AP finish
 448                                       or TimeoutInMicroSeconds expires.  If it's
 449                                       not NULL, then execute in non-blocking mode.
 450                                       BSP requests the function specified by
 451                                       Procedure to be started on this AP,
 452                                       and go on executing immediately. If this AP
 453                                       return from Procedure or TimeoutInMicroSeconds
 454                                       expires, this event is signaled. The BSP
 455                                       can use the CheckEvent() or WaitForEvent()
 456                                       services to check the state of event.  Type
 457                                       EFI_EVENT is defined in CreateEvent() in
 458                                       the Unified Extensible Firmware Interface
 459                                       Specification.
 460   @param[in]  TimeoutInMicrosecsond   Indicates the time limit in microseconds for
 461                                       this AP to finish this Procedure, either for
 462                                       blocking or non-blocking mode. Zero means
 463                                       infinity.  If the timeout expires before
 464                                       this AP returns from Procedure, then Procedure
 465                                       on the AP is terminated. The
 466                                       AP is available for next function assigned
 467                                       by MpInitLibStartupAllAPs() or
 468                                       MpInitLibStartupThisAP().
 469                                       If the timeout expires in blocking mode,
 470                                       BSP returns EFI_TIMEOUT.  If the timeout
 471                                       expires in non-blocking mode, WaitEvent
 472                                       is signaled with SignalEvent().
 473   @param[in]  ProcedureArgument       The parameter passed into Procedure on the
 474                                       specified AP.
 475   @param[out] Finished                If NULL, this parameter is ignored.  In
 476                                       blocking mode, this parameter is ignored.
 477                                       In non-blocking mode, if AP returns from
 478                                       Procedure before the timeout expires, its
 479                                       content is set to TRUE. Otherwise, the
 480                                       value is set to FALSE. The caller can
 481                                       determine if the AP returned from Procedure
 482                                       by evaluating this value.
 483
 484   @retval EFI_SUCCESS             In blocking mode, specified AP finished before
 485                                   the timeout expires.
 486   @retval EFI_SUCCESS             In non-blocking mode, the function has been
 487                                   dispatched to specified AP.
 488   @retval EFI_UNSUPPORTED         A non-blocking mode request was made after the
 489                                   UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was
 490                                   signaled.
 491   @retval EFI_UNSUPPORTED         WaitEvent is not NULL if non-blocking mode is not
 492                                   supported.
 493   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
 494   @retval EFI_TIMEOUT             In blocking mode, the timeout expired before
 495                                   the specified AP has finished.
 496   @retval EFI_NOT_READY           The specified AP is busy.
 497   @retval EFI_NOT_READY           MP Initialize Library is not initialized.
 498   @retval EFI_NOT_FOUND           The processor with the handle specified by
 499                                   ProcessorNumber does not exist.
 500   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the BSP or disabled AP.
 501   @retval EFI_INVALID_PARAMETER   Procedure is NULL.
 502
 503 **/
 504 EFI_STATUS
 505 EFIAPI
 506 MpInitLibStartupThisAP (
 507   IN  EFI_AP_PROCEDURE          Procedure,
 508   IN  UINTN                     ProcessorNumber,
 509   IN  EFI_EVENT                 WaitEvent               OPTIONAL,
 510   IN  UINTN                     TimeoutInMicroseconds,
 511   IN  VOID                      *ProcedureArgument      OPTIONAL,
 512   OUT BOOLEAN                   *Finished               OPTIONAL
 513   )
 514 {
 515   EFI_STATUS              Status;
 516
 517   //
 518   // temporarily stop checkAllApsStatus for avoid resource dead-lock.
 519   //
 520   mStopCheckAllApsStatus = TRUE;
 521
 522   Status = StartupThisAPWorker (
 523              Procedure,
 524              ProcessorNumber,
 525              WaitEvent,
 526              TimeoutInMicroseconds,
 527              ProcedureArgument,
 528              Finished
 529              );
 530
 531   mStopCheckAllApsStatus = FALSE;
 532
 533   return Status;
 534 }
 535
 536 /**
 537   This service switches the requested AP to be the BSP from that point onward.
 538   This service changes the BSP for all purposes. This call can only be performed
 539   by the current BSP.
 540
 541   @param[in] ProcessorNumber   The handle number of AP that is to become the new
 542                                BSP. The range is from 0 to the total number of
 543                                logical processors minus 1. The total number of
 544                                logical processors can be retrieved by
 545                                MpInitLibGetNumberOfProcessors().
 546   @param[in] EnableOldBSP      If TRUE, then the old BSP will be listed as an
 547                                enabled AP. Otherwise, it will be disabled.
 548
 549   @retval EFI_SUCCESS             BSP successfully switched.
 550   @retval EFI_UNSUPPORTED         Switching the BSP cannot be completed prior to
 551                                   this service returning.
 552   @retval EFI_UNSUPPORTED         Switching the BSP is not supported.
 553   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
 554   @retval EFI_NOT_FOUND           The processor with the handle specified by
 555                                   ProcessorNumber does not exist.
 556   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the current BSP or
 557                                   a disabled AP.
 558   @retval EFI_NOT_READY           The specified AP is busy.
 559   @retval EFI_NOT_READY           MP Initialize Library is not initialized.
 560
 561 **/
 562 EFI_STATUS
 563 EFIAPI
 564 MpInitLibSwitchBSP (
 565   IN UINTN                     ProcessorNumber,
 566   IN BOOLEAN                   EnableOldBSP
 567   )
 568 {
 569   EFI_STATUS            Status;
 570   BOOLEAN               OldInterruptState;
 571
 572   //
 573   // Before send both BSP and AP to a procedure to exchange their roles,
 574   // interrupt must be disabled. This is because during the exchange role
 575   // process, 2 CPU may use 1 stack. If interrupt happens, the stack will
 576   // be corrupted, since interrupt return address will be pushed to stack
 577   // by hardware.
 578   //
 579   OldInterruptState = SaveAndDisableInterrupts ();
 580
 581   //
 582   // Mask LINT0 & LINT1 for the old BSP
 583   //
 584   DisableLvtInterrupts ();
 585
 586   Status = SwitchBSPWorker (ProcessorNumber, EnableOldBSP);
 587
 588   //
 589   // Restore interrupt state.
 590   //
 591   SetInterruptState (OldInterruptState);
 592
 593   return Status;
 594 }
 595
 596 /**
 597   This service lets the caller enable or disable an AP from this point onward.
 598   This service may only be called from the BSP.
 599
 600   @param[in] ProcessorNumber   The handle number of AP.
 601                                The range is from 0 to the total number of
 602                                logical processors minus 1. The total number of
 603                                logical processors can be retrieved by
 604                                MpInitLibGetNumberOfProcessors().
 605   @param[in] EnableAP          Specifies the new state for the processor for
 606                                enabled, FALSE for disabled.
 607   @param[in] HealthFlag        If not NULL, a pointer to a value that specifies
 608                                the new health status of the AP. This flag
 609                                corresponds to StatusFlag defined in
 610                                EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only
 611                                the PROCESSOR_HEALTH_STATUS_BIT is used. All other
 612                                bits are ignored.  If it is NULL, this parameter
 613                                is ignored.
 614
 615   @retval EFI_SUCCESS             The specified AP was enabled or disabled successfully.
 616   @retval EFI_UNSUPPORTED         Enabling or disabling an AP cannot be completed
 617                                   prior to this service returning.
 618   @retval EFI_UNSUPPORTED         Enabling or disabling an AP is not supported.
 619   @retval EFI_DEVICE_ERROR        The calling processor is an AP.
 620   @retval EFI_NOT_FOUND           Processor with the handle specified by ProcessorNumber
 621                                   does not exist.
 622   @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the BSP.
 623   @retval EFI_NOT_READY           MP Initialize Library is not initialized.
 624
 625 **/
 626 EFI_STATUS
 627 EFIAPI
 628 MpInitLibEnableDisableAP (
 629   IN  UINTN                     ProcessorNumber,
 630   IN  BOOLEAN                   EnableAP,
 631   IN  UINT32                    *HealthFlag OPTIONAL
 632   )
 633 {
 634   EFI_STATUS     Status;
 635   BOOLEAN        TempStopCheckState;
 636
 637   TempStopCheckState = FALSE;
 638   //
 639   // temporarily stop checkAllAPsStatus for initialize parameters.
 640   //
 641   if (!mStopCheckAllApsStatus) {
 642     mStopCheckAllApsStatus = TRUE;
 643     TempStopCheckState     = TRUE;
 644   }
 645
 646   Status = EnableDisableApWorker (ProcessorNumber, EnableAP, HealthFlag);
 647
 648   if (TempStopCheckState) {
 649     mStopCheckAllApsStatus = FALSE;
 650   }
 651
 652   return Status;
 653 }