[mirror_edk2.git] / UefiCpuPkg / Library / MpInitLib / PeiMpLib.c

/** @file\r
  MP initialize support functions for PEI phase.\r
\r
  Copyright (c) 2016 - 2020, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "MpLib.h"\r
#include <Library/PeiServicesLib.h>\r
#include <Guid/S3SmmInitDone.h>\r
#include <Ppi/ShadowMicrocode.h>\r
\r
STATIC UINT64 mSevEsPeiWakeupBuffer = BASE_1MB;\r
\r
/**\r
  S3 SMM Init Done notification function.\r
\r
  @param  PeiServices      Indirect reference to the PEI Services Table.\r
  @param  NotifyDesc       Address of the notification descriptor data structure.\r
  @param  InvokePpi        Address of the PPI that was invoked.\r
\r
  @retval EFI_SUCCESS      The function completes successfully.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
NotifyOnS3SmmInitDonePpi (\r
  IN  EFI_PEI_SERVICES                              **PeiServices,\r
  IN  EFI_PEI_NOTIFY_DESCRIPTOR                     *NotifyDesc,\r
  IN  VOID                                          *InvokePpi\r
  );\r
\r
\r
//\r
// Global function\r
//\r
EFI_PEI_NOTIFY_DESCRIPTOR        mS3SmmInitDoneNotifyDesc = {\r
  EFI_PEI_PPI_DESCRIPTOR_NOTIFY_CALLBACK | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST,\r
  &gEdkiiS3SmmInitDoneGuid,\r
  NotifyOnS3SmmInitDonePpi\r
};\r
\r
/**\r
  S3 SMM Init Done notification function.\r
\r
  @param  PeiServices      Indirect reference to the PEI Services Table.\r
  @param  NotifyDesc       Address of the notification descriptor data structure.\r
  @param  InvokePpi        Address of the PPI that was invoked.\r
\r
  @retval EFI_SUCCESS      The function completes successfully.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
NotifyOnS3SmmInitDonePpi (\r
  IN  EFI_PEI_SERVICES                              **PeiServices,\r
  IN  EFI_PEI_NOTIFY_DESCRIPTOR                     *NotifyDesc,\r
  IN  VOID                                          *InvokePpi\r
  )\r
{\r
  CPU_MP_DATA     *CpuMpData;\r
\r
  CpuMpData = GetCpuMpData ();\r
\r
  //\r
  // PiSmmCpuDxeSmm driver hardcode change the loop mode to HLT mode.\r
  // So in this notify function, code need to check the current loop\r
  // mode, if it is not HLT mode, code need to change loop mode back\r
  // to the original mode.\r
  //\r
  if (CpuMpData->ApLoopMode != ApInHltLoop) {\r
    CpuMpData->WakeUpByInitSipiSipi = TRUE;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
\r
/**\r
  Enable Debug Agent to support source debugging on AP function.\r
\r
**/\r
VOID\r
EnableDebugAgent (\r
  VOID\r
  )\r
{\r
}\r
\r
/**\r
  Get pointer to CPU MP Data structure.\r
  For BSP, the pointer is retrieved from HOB.\r
  For AP, the structure is just after IDT.\r
\r
  @return  The pointer to CPU MP Data structure.\r
**/\r
CPU_MP_DATA *\r
GetCpuMpData (\r
  VOID\r
  )\r
{\r
  CPU_MP_DATA                  *CpuMpData;\r
  MSR_IA32_APIC_BASE_REGISTER  ApicBaseMsr;\r
  IA32_DESCRIPTOR              Idtr;\r
\r
  ApicBaseMsr.Uint64 = AsmReadMsr64 (MSR_IA32_APIC_BASE);\r
  if (ApicBaseMsr.Bits.BSP == 1) {\r
    CpuMpData = GetCpuMpDataFromGuidedHob ();\r
    ASSERT (CpuMpData != NULL);\r
  } else {\r
    AsmReadIdtr (&Idtr);\r
    CpuMpData = (CPU_MP_DATA *) (Idtr.Base + Idtr.Limit + 1);\r
  }\r
  return CpuMpData;\r
}\r
\r
/**\r
  Save the pointer to CPU MP Data structure.\r
\r
  @param[in] CpuMpData  The pointer to CPU MP Data structure will be saved.\r
**/\r
VOID\r
SaveCpuMpData (\r
  IN CPU_MP_DATA   *CpuMpData\r
  )\r
{\r
  UINT64           Data64;\r
  //\r
  // Build location of CPU MP DATA buffer in HOB\r
  //\r
  Data64 = (UINT64) (UINTN) CpuMpData;\r
  BuildGuidDataHob (\r
    &mCpuInitMpLibHobGuid,\r
    (VOID *) &Data64,\r
    sizeof (UINT64)\r
    );\r
}\r
\r
/**\r
  Check if AP wakeup buffer is overlapped with existing allocated buffer.\r
\r
  @param[in]  WakeupBufferStart     AP wakeup buffer start address.\r
  @param[in]  WakeupBufferEnd       AP wakeup buffer end address.\r
\r
  @retval  TRUE       There is overlap.\r
  @retval  FALSE      There is no overlap.\r
**/\r
BOOLEAN\r
CheckOverlapWithAllocatedBuffer (\r
  IN UINT64               WakeupBufferStart,\r
  IN UINT64               WakeupBufferEnd\r
  )\r
{\r
  EFI_PEI_HOB_POINTERS      Hob;\r
  EFI_HOB_MEMORY_ALLOCATION *MemoryHob;\r
  BOOLEAN                   Overlapped;\r
  UINT64                    MemoryStart;\r
  UINT64                    MemoryEnd;\r
\r
  Overlapped = FALSE;\r
  //\r
  // Get the HOB list for processing\r
  //\r
  Hob.Raw = GetHobList ();\r
  //\r
  // Collect memory ranges\r
  //\r
  while (!END_OF_HOB_LIST (Hob)) {\r
    if (Hob.Header->HobType == EFI_HOB_TYPE_MEMORY_ALLOCATION) {\r
      MemoryHob   = Hob.MemoryAllocation;\r
      MemoryStart = MemoryHob->AllocDescriptor.MemoryBaseAddress;\r
      MemoryEnd   = MemoryHob->AllocDescriptor.MemoryBaseAddress + MemoryHob->AllocDescriptor.MemoryLength;\r
      if (!((WakeupBufferStart >= MemoryEnd) || (WakeupBufferEnd <= MemoryStart))) {\r
        Overlapped = TRUE;\r
        break;\r
      }\r
    }\r
    Hob.Raw = GET_NEXT_HOB (Hob);\r
  }\r
  return Overlapped;\r
}\r
\r
/**\r
  Get available system memory below 1MB by specified size.\r
\r
  @param[in] WakeupBufferSize   Wakeup buffer size required\r
\r
  @retval other   Return wakeup buffer address below 1MB.\r
  @retval -1      Cannot find free memory below 1MB.\r
**/\r
UINTN\r
GetWakeupBuffer (\r
  IN UINTN                WakeupBufferSize\r
  )\r
{\r
  EFI_PEI_HOB_POINTERS    Hob;\r
  UINT64                  WakeupBufferStart;\r
  UINT64                  WakeupBufferEnd;\r
\r
  WakeupBufferSize = (WakeupBufferSize + SIZE_4KB - 1) & ~(SIZE_4KB - 1);\r
\r
  //\r
  // Get the HOB list for processing\r
  //\r
  Hob.Raw = GetHobList ();\r
\r
  //\r
  // Collect memory ranges\r
  //\r
  while (!END_OF_HOB_LIST (Hob)) {\r
    if (Hob.Header->HobType == EFI_HOB_TYPE_RESOURCE_DESCRIPTOR) {\r
      if ((Hob.ResourceDescriptor->PhysicalStart < BASE_1MB) &&\r
          (Hob.ResourceDescriptor->ResourceType == EFI_RESOURCE_SYSTEM_MEMORY) &&\r
          ((Hob.ResourceDescriptor->ResourceAttribute &\r
            (EFI_RESOURCE_ATTRIBUTE_READ_PROTECTED |\r
             EFI_RESOURCE_ATTRIBUTE_WRITE_PROTECTED |\r
             EFI_RESOURCE_ATTRIBUTE_EXECUTION_PROTECTED\r
             )) == 0)\r
           ) {\r
        //\r
        // Need memory under 1MB to be collected here\r
        //\r
        WakeupBufferEnd = Hob.ResourceDescriptor->PhysicalStart + Hob.ResourceDescriptor->ResourceLength;\r
        if (PcdGetBool (PcdSevEsIsEnabled) &&\r
            WakeupBufferEnd > mSevEsPeiWakeupBuffer) {\r
          //\r
          // SEV-ES Wakeup buffer should be under 1MB and under any previous one\r
          //\r
          WakeupBufferEnd = mSevEsPeiWakeupBuffer;\r
        } else if (WakeupBufferEnd > BASE_1MB) {\r
          //\r
          // Wakeup buffer should be under 1MB\r
          //\r
          WakeupBufferEnd = BASE_1MB;\r
        }\r
        while (WakeupBufferEnd > WakeupBufferSize) {\r
          //\r
          // Wakeup buffer should be aligned on 4KB\r
          //\r
          WakeupBufferStart = (WakeupBufferEnd - WakeupBufferSize) & ~(SIZE_4KB - 1);\r
          if (WakeupBufferStart < Hob.ResourceDescriptor->PhysicalStart) {\r
            break;\r
          }\r
          if (CheckOverlapWithAllocatedBuffer (WakeupBufferStart, WakeupBufferEnd)) {\r
            //\r
            // If this range is overlapped with existing allocated buffer, skip it\r
            // and find the next range\r
            //\r
            WakeupBufferEnd -= WakeupBufferSize;\r
            continue;\r
          }\r
          DEBUG ((DEBUG_INFO, "WakeupBufferStart = %x, WakeupBufferSize = %x\n",\r
                               WakeupBufferStart, WakeupBufferSize));\r
\r
          if (PcdGetBool (PcdSevEsIsEnabled)) {\r
            //\r
            // Next SEV-ES wakeup buffer allocation must be below this\r
            // allocation\r
            //\r
            mSevEsPeiWakeupBuffer = WakeupBufferStart;\r
          }\r
\r
          return (UINTN)WakeupBufferStart;\r
        }\r
      }\r
    }\r
    //\r
    // Find the next HOB\r
    //\r
    Hob.Raw = GET_NEXT_HOB (Hob);\r
  }\r
\r
  return (UINTN) -1;\r
}\r
\r
/**\r
  Get available EfiBootServicesCode memory below 4GB by specified size.\r
\r
  This buffer is required to safely transfer AP from real address mode to\r
  protected mode or long mode, due to the fact that the buffer returned by\r
  GetWakeupBuffer() may be marked as non-executable.\r
\r
  @param[in] BufferSize   Wakeup transition buffer size.\r
\r
  @retval other   Return wakeup transition buffer address below 4GB.\r
  @retval 0       Cannot find free memory below 4GB.\r
**/\r
UINTN\r
GetModeTransitionBuffer (\r
  IN UINTN                BufferSize\r
  )\r
{\r
  //\r
  // PEI phase doesn't need to do such transition. So simply return 0.\r
  //\r
  return 0;\r
}\r
\r
/**\r
  Return the address of the SEV-ES AP jump table.\r
\r
  This buffer is required in order for an SEV-ES guest to transition from\r
  UEFI into an OS.\r
\r
  @return         Return SEV-ES AP jump table buffer\r
**/\r
UINTN\r
GetSevEsAPMemory (\r
  VOID\r
  )\r
{\r
  //\r
  // PEI phase doesn't need to do such transition. So simply return 0.\r
  //\r
  return 0;\r
}\r
\r
/**\r
  Checks APs status and updates APs status if needed.\r
\r
**/\r
VOID\r
CheckAndUpdateApsStatus (\r
  VOID\r
  )\r
{\r
}\r
\r
/**\r
  Build the microcode patch HOB that contains the base address and size of the\r
  microcode patch stored in the memory.\r
\r
  @param[in]  CpuMpData    Pointer to the CPU_MP_DATA structure.\r
\r
**/\r
VOID\r
BuildMicrocodeCacheHob (\r
  IN CPU_MP_DATA    *CpuMpData\r
  )\r
{\r
  EDKII_MICROCODE_PATCH_HOB    *MicrocodeHob;\r
  UINTN                        HobDataLength;\r
  UINT32                       Index;\r
\r
  HobDataLength = sizeof (EDKII_MICROCODE_PATCH_HOB) +\r
                  sizeof (UINT64) * CpuMpData->CpuCount;\r
\r
  MicrocodeHob  = AllocatePool (HobDataLength);\r
  if (MicrocodeHob == NULL) {\r
    ASSERT (FALSE);\r
    return;\r
  }\r
\r
  //\r
  // Store the information of the memory region that holds the microcode patches.\r
  //\r
  MicrocodeHob->MicrocodePatchAddress    = CpuMpData->MicrocodePatchAddress;\r
  MicrocodeHob->MicrocodePatchRegionSize = CpuMpData->MicrocodePatchRegionSize;\r
\r
  //\r
  // Store the detected microcode patch for each processor as well.\r
  //\r
  MicrocodeHob->ProcessorCount = CpuMpData->CpuCount;\r
  for (Index = 0; Index < CpuMpData->CpuCount; Index++) {\r
    if (CpuMpData->CpuData[Index].MicrocodeEntryAddr != 0) {\r
      MicrocodeHob->ProcessorSpecificPatchOffset[Index] =\r
        CpuMpData->CpuData[Index].MicrocodeEntryAddr - CpuMpData->MicrocodePatchAddress;\r
    } else {\r
      MicrocodeHob->ProcessorSpecificPatchOffset[Index] = MAX_UINT64;\r
    }\r
  }\r
\r
  BuildGuidDataHob (\r
    &gEdkiiMicrocodePatchHobGuid,\r
    MicrocodeHob,\r
    HobDataLength\r
    );\r
\r
  return;\r
}\r
\r
/**\r
  Initialize global data for MP support.\r
\r
  @param[in] CpuMpData  The pointer to CPU MP Data structure.\r
**/\r
VOID\r
InitMpGlobalData (\r
  IN CPU_MP_DATA               *CpuMpData\r
  )\r
{\r
  EFI_STATUS  Status;\r
\r
  BuildMicrocodeCacheHob (CpuMpData);\r
  SaveCpuMpData (CpuMpData);\r
\r
  ///\r
  /// Install Notify\r
  ///\r
  Status = PeiServicesNotifyPpi (&mS3SmmInitDoneNotifyDesc);\r
  ASSERT_EFI_ERROR (Status);\r
}\r
\r
/**\r
  This service executes a caller provided function on all enabled APs.\r
\r
  @param[in]  Procedure               A pointer to the function to be run on\r
                                      enabled APs of the system. See type\r
                                      EFI_AP_PROCEDURE.\r
  @param[in]  SingleThread            If TRUE, then all the enabled APs execute\r
                                      the function specified by Procedure one by\r
                                      one, in ascending order of processor handle\r
                                      number.  If FALSE, then all the enabled APs\r
                                      execute the function specified by Procedure\r
                                      simultaneously.\r
  @param[in]  WaitEvent               The event created by the caller with CreateEvent()\r
                                      service.  If it is NULL, then execute in\r
                                      blocking mode. BSP waits until all APs finish\r
                                      or TimeoutInMicroSeconds expires.  If it's\r
                                      not NULL, then execute in non-blocking mode.\r
                                      BSP requests the function specified by\r
                                      Procedure to be started on all the enabled\r
                                      APs, and go on executing immediately. If\r
                                      all return from Procedure, or TimeoutInMicroSeconds\r
                                      expires, this event is signaled. The BSP\r
                                      can use the CheckEvent() or WaitForEvent()\r
                                      services to check the state of event.  Type\r
                                      EFI_EVENT is defined in CreateEvent() in\r
                                      the Unified Extensible Firmware Interface\r
                                      Specification.\r
  @param[in]  TimeoutInMicroseconds   Indicates the time limit in microseconds for\r
                                      APs to return from Procedure, either for\r
                                      blocking or non-blocking mode. Zero means\r
                                      infinity.  If the timeout expires before\r
                                      all APs return from Procedure, then Procedure\r
                                      on the failed APs is terminated. All enabled\r
                                      APs are available for next function assigned\r
                                      by MpInitLibStartupAllAPs() or\r
                                      MPInitLibStartupThisAP().\r
                                      If the timeout expires in blocking mode,\r
                                      BSP returns EFI_TIMEOUT.  If the timeout\r
                                      expires in non-blocking mode, WaitEvent\r
                                      is signaled with SignalEvent().\r
  @param[in]  ProcedureArgument       The parameter passed into Procedure for\r
                                      all APs.\r
  @param[out] FailedCpuList           If NULL, this parameter is ignored. Otherwise,\r
                                      if all APs finish successfully, then its\r
                                      content is set to NULL. If not all APs\r
                                      finish before timeout expires, then its\r
                                      content is set to address of the buffer\r
                                      holding handle numbers of the failed APs.\r
                                      The buffer is allocated by MP Initialization\r
                                      library, and it's the caller's responsibility to\r
                                      free the buffer with FreePool() service.\r
                                      In blocking mode, it is ready for consumption\r
                                      when the call returns. In non-blocking mode,\r
                                      it is ready when WaitEvent is signaled.  The\r
                                      list of failed CPU is terminated by\r
                                      END_OF_CPU_LIST.\r
\r
  @retval EFI_SUCCESS             In blocking mode, all APs have finished before\r
                                  the timeout expired.\r
  @retval EFI_SUCCESS             In non-blocking mode, function has been dispatched\r
                                  to all enabled APs.\r
  @retval EFI_UNSUPPORTED         A non-blocking mode request was made after the\r
                                  UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was\r
                                  signaled.\r
  @retval EFI_UNSUPPORTED         WaitEvent is not NULL if non-blocking mode is not\r
                                  supported.\r
  @retval EFI_DEVICE_ERROR        Caller processor is AP.\r
  @retval EFI_NOT_STARTED         No enabled APs exist in the system.\r
  @retval EFI_NOT_READY           Any enabled APs are busy.\r
  @retval EFI_NOT_READY           MP Initialize Library is not initialized.\r
  @retval EFI_TIMEOUT             In blocking mode, the timeout expired before\r
                                  all enabled APs have finished.\r
  @retval EFI_INVALID_PARAMETER   Procedure is NULL.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
MpInitLibStartupAllAPs (\r
  IN  EFI_AP_PROCEDURE          Procedure,\r
  IN  BOOLEAN                   SingleThread,\r
  IN  EFI_EVENT                 WaitEvent               OPTIONAL,\r
  IN  UINTN                     TimeoutInMicroseconds,\r
  IN  VOID                      *ProcedureArgument      OPTIONAL,\r
  OUT UINTN                     **FailedCpuList         OPTIONAL\r
  )\r
{\r
  if (WaitEvent != NULL) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  return StartupAllCPUsWorker (\r
           Procedure,\r
           SingleThread,\r
           TRUE,\r
           NULL,\r
           TimeoutInMicroseconds,\r
           ProcedureArgument,\r
           FailedCpuList\r
           );\r
}\r
\r
/**\r
  This service lets the caller get one enabled AP to execute a caller-provided\r
  function.\r
\r
  @param[in]  Procedure               A pointer to the function to be run on the\r
                                      designated AP of the system. See type\r
                                      EFI_AP_PROCEDURE.\r
  @param[in]  ProcessorNumber         The handle number of the AP. The range is\r
                                      from 0 to the total number of logical\r
                                      processors minus 1. The total number of\r
                                      logical processors can be retrieved by\r
                                      MpInitLibGetNumberOfProcessors().\r
  @param[in]  WaitEvent               The event created by the caller with CreateEvent()\r
                                      service.  If it is NULL, then execute in\r
                                      blocking mode. BSP waits until this AP finish\r
                                      or TimeoutInMicroSeconds expires.  If it's\r
                                      not NULL, then execute in non-blocking mode.\r
                                      BSP requests the function specified by\r
                                      Procedure to be started on this AP,\r
                                      and go on executing immediately. If this AP\r
                                      return from Procedure or TimeoutInMicroSeconds\r
                                      expires, this event is signaled. The BSP\r
                                      can use the CheckEvent() or WaitForEvent()\r
                                      services to check the state of event.  Type\r
                                      EFI_EVENT is defined in CreateEvent() in\r
                                      the Unified Extensible Firmware Interface\r
                                      Specification.\r
  @param[in]  TimeoutInMicroseconds   Indicates the time limit in microseconds for\r
                                      this AP to finish this Procedure, either for\r
                                      blocking or non-blocking mode. Zero means\r
                                      infinity.  If the timeout expires before\r
                                      this AP returns from Procedure, then Procedure\r
                                      on the AP is terminated. The\r
                                      AP is available for next function assigned\r
                                      by MpInitLibStartupAllAPs() or\r
                                      MpInitLibStartupThisAP().\r
                                      If the timeout expires in blocking mode,\r
                                      BSP returns EFI_TIMEOUT.  If the timeout\r
                                      expires in non-blocking mode, WaitEvent\r
                                      is signaled with SignalEvent().\r
  @param[in]  ProcedureArgument       The parameter passed into Procedure on the\r
                                      specified AP.\r
  @param[out] Finished                If NULL, this parameter is ignored.  In\r
                                      blocking mode, this parameter is ignored.\r
                                      In non-blocking mode, if AP returns from\r
                                      Procedure before the timeout expires, its\r
                                      content is set to TRUE. Otherwise, the\r
                                      value is set to FALSE. The caller can\r
                                      determine if the AP returned from Procedure\r
                                      by evaluating this value.\r
\r
  @retval EFI_SUCCESS             In blocking mode, specified AP finished before\r
                                  the timeout expires.\r
  @retval EFI_SUCCESS             In non-blocking mode, the function has been\r
                                  dispatched to specified AP.\r
  @retval EFI_UNSUPPORTED         A non-blocking mode request was made after the\r
                                  UEFI event EFI_EVENT_GROUP_READY_TO_BOOT was\r
                                  signaled.\r
  @retval EFI_UNSUPPORTED         WaitEvent is not NULL if non-blocking mode is not\r
                                  supported.\r
  @retval EFI_DEVICE_ERROR        The calling processor is an AP.\r
  @retval EFI_TIMEOUT             In blocking mode, the timeout expired before\r
                                  the specified AP has finished.\r
  @retval EFI_NOT_READY           The specified AP is busy.\r
  @retval EFI_NOT_READY           MP Initialize Library is not initialized.\r
  @retval EFI_NOT_FOUND           The processor with the handle specified by\r
                                  ProcessorNumber does not exist.\r
  @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the BSP or disabled AP.\r
  @retval EFI_INVALID_PARAMETER   Procedure is NULL.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
MpInitLibStartupThisAP (\r
  IN  EFI_AP_PROCEDURE          Procedure,\r
  IN  UINTN                     ProcessorNumber,\r
  IN  EFI_EVENT                 WaitEvent               OPTIONAL,\r
  IN  UINTN                     TimeoutInMicroseconds,\r
  IN  VOID                      *ProcedureArgument      OPTIONAL,\r
  OUT BOOLEAN                   *Finished               OPTIONAL\r
  )\r
{\r
  if (WaitEvent != NULL) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  return StartupThisAPWorker (\r
           Procedure,\r
           ProcessorNumber,\r
           NULL,\r
           TimeoutInMicroseconds,\r
           ProcedureArgument,\r
           Finished\r
           );\r
}\r
\r
/**\r
  This service switches the requested AP to be the BSP from that point onward.\r
  This service changes the BSP for all purposes. This call can only be performed\r
  by the current BSP.\r
\r
  @param[in] ProcessorNumber   The handle number of AP that is to become the new\r
                               BSP. The range is from 0 to the total number of\r
                               logical processors minus 1. The total number of\r
                               logical processors can be retrieved by\r
                               MpInitLibGetNumberOfProcessors().\r
  @param[in] EnableOldBSP      If TRUE, then the old BSP will be listed as an\r
                               enabled AP. Otherwise, it will be disabled.\r
\r
  @retval EFI_SUCCESS             BSP successfully switched.\r
  @retval EFI_UNSUPPORTED         Switching the BSP cannot be completed prior to\r
                                  this service returning.\r
  @retval EFI_UNSUPPORTED         Switching the BSP is not supported.\r
  @retval EFI_DEVICE_ERROR        The calling processor is an AP.\r
  @retval EFI_NOT_FOUND           The processor with the handle specified by\r
                                  ProcessorNumber does not exist.\r
  @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the current BSP or\r
                                  a disabled AP.\r
  @retval EFI_NOT_READY           The specified AP is busy.\r
  @retval EFI_NOT_READY           MP Initialize Library is not initialized.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
MpInitLibSwitchBSP (\r
  IN UINTN                     ProcessorNumber,\r
  IN  BOOLEAN                  EnableOldBSP\r
  )\r
{\r
  return SwitchBSPWorker (ProcessorNumber, EnableOldBSP);\r
}\r
\r
/**\r
  This service lets the caller enable or disable an AP from this point onward.\r
  This service may only be called from the BSP.\r
\r
  @param[in] ProcessorNumber   The handle number of AP.\r
                               The range is from 0 to the total number of\r
                               logical processors minus 1. The total number of\r
                               logical processors can be retrieved by\r
                               MpInitLibGetNumberOfProcessors().\r
  @param[in] EnableAP          Specifies the new state for the processor for\r
                               enabled, FALSE for disabled.\r
  @param[in] HealthFlag        If not NULL, a pointer to a value that specifies\r
                               the new health status of the AP. This flag\r
                               corresponds to StatusFlag defined in\r
                               EFI_MP_SERVICES_PROTOCOL.GetProcessorInfo(). Only\r
                               the PROCESSOR_HEALTH_STATUS_BIT is used. All other\r
                               bits are ignored.  If it is NULL, this parameter\r
                               is ignored.\r
\r
  @retval EFI_SUCCESS             The specified AP was enabled or disabled successfully.\r
  @retval EFI_UNSUPPORTED         Enabling or disabling an AP cannot be completed\r
                                  prior to this service returning.\r
  @retval EFI_UNSUPPORTED         Enabling or disabling an AP is not supported.\r
  @retval EFI_DEVICE_ERROR        The calling processor is an AP.\r
  @retval EFI_NOT_FOUND           Processor with the handle specified by ProcessorNumber\r
                                  does not exist.\r
  @retval EFI_INVALID_PARAMETER   ProcessorNumber specifies the BSP.\r
  @retval EFI_NOT_READY           MP Initialize Library is not initialized.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
MpInitLibEnableDisableAP (\r
  IN  UINTN                     ProcessorNumber,\r
  IN  BOOLEAN                   EnableAP,\r
  IN  UINT32                    *HealthFlag OPTIONAL\r
  )\r
{\r
  return EnableDisableApWorker (ProcessorNumber, EnableAP, HealthFlag);\r
}\r
\r
/**\r
  This funtion will try to invoke platform specific microcode shadow logic to\r
  relocate microcode update patches into memory.\r
\r
  @param[in, out] CpuMpData  The pointer to CPU MP Data structure.\r
\r
  @retval EFI_SUCCESS              Shadow microcode success.\r
  @retval EFI_OUT_OF_RESOURCES     No enough resource to complete the operation.\r
  @retval EFI_UNSUPPORTED          Can't find platform specific microcode shadow\r
                                   PPI/Protocol.\r
**/\r
EFI_STATUS\r
PlatformShadowMicrocode (\r
  IN OUT CPU_MP_DATA             *CpuMpData\r
  )\r
{\r
  EFI_STATUS                         Status;\r
  EDKII_PEI_SHADOW_MICROCODE_PPI     *ShadowMicrocodePpi;\r
  UINTN                              CpuCount;\r
  EDKII_PEI_MICROCODE_CPU_ID         *MicrocodeCpuId;\r
  UINTN                              Index;\r
  UINTN                              BufferSize;\r
  VOID                               *Buffer;\r
\r
  Status = PeiServicesLocatePpi (\r
             &gEdkiiPeiShadowMicrocodePpiGuid,\r
             0,\r
             NULL,\r
             (VOID **) &ShadowMicrocodePpi\r
             );\r
  if (EFI_ERROR (Status)) {\r
    return EFI_UNSUPPORTED;\r
  }\r
\r
  CpuCount = CpuMpData->CpuCount;\r
  MicrocodeCpuId = (EDKII_PEI_MICROCODE_CPU_ID *) AllocateZeroPool (sizeof (EDKII_PEI_MICROCODE_CPU_ID) * CpuCount);\r
  if (MicrocodeCpuId == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  for (Index = 0; Index < CpuMpData->CpuCount; Index++) {\r
    MicrocodeCpuId[Index].ProcessorSignature = CpuMpData->CpuData[Index].ProcessorSignature;\r
    MicrocodeCpuId[Index].PlatformId         = CpuMpData->CpuData[Index].PlatformId;\r
  }\r
\r
  Status = ShadowMicrocodePpi->ShadowMicrocode (\r
             ShadowMicrocodePpi,\r
             CpuCount,\r
             MicrocodeCpuId,\r
             &BufferSize,\r
             &Buffer\r
             );\r
  FreePool (MicrocodeCpuId);\r
  if (EFI_ERROR (Status)) {\r
    return EFI_NOT_FOUND;\r
  }\r
\r
  CpuMpData->MicrocodePatchAddress    = (UINTN) Buffer;\r
  CpuMpData->MicrocodePatchRegionSize = BufferSize;\r
\r
  DEBUG ((\r
    DEBUG_INFO,\r
    "%a: Required microcode patches have been loaded at 0x%lx, with size 0x%lx.\n",\r
    __FUNCTION__, CpuMpData->MicrocodePatchAddress, CpuMpData->MicrocodePatchRegionSize\r
    ));\r
\r
  return EFI_SUCCESS;\r
}\r