path: root/ReferenceCode/Haswell/DTS/Smm/DigitalThermalSensorSmm.c

/** @file
  Digital Thermal Sensor (DTS) driver.
  This SMM driver configures and supports the Digital Thermal Sensor features for the platform.

@copyright
  Copyright (c) 1999 - 2012 Intel Corporation. All rights reserved
  This software and associated documentation (if any) is furnished
  under a license and may only be used or copied in accordance
  with the terms of the license. Except as permitted by such
  license, no part of this software or documentation may be
  reproduced, stored in a retrieval system, or transmitted in any
  form or by any means without the express written consent of
  Intel Corporation.

  This file contains an 'Intel Peripheral Driver' and uniquely
  identified as "Intel Reference Module" and is
  licensed for Intel CPUs and chipsets under the terms of your
  license agreement with Intel or your vendor.  This file may
  be modified by the user, subject to additional terms of the
  license agreement

**/
#include "DigitalThermalSensorSmm.h"
#include "KscLib.h"
//
// Protocol GUID definition
//
DXE_CPU_PLATFORM_POLICY_PROTOCOL *mPlatformCpu                     = NULL;

EFI_GUID                 gDtsInitStatusProtocolGuid        = DTS_INIT_STATUS_PROTOCOL_GUID;
EFI_GUID                 mEfiGlobalNvsAreaProtocolGuid     = EFI_GLOBAL_NVS_AREA_PROTOCOL_GUID;
EFI_GUID                 mEfiSmmIoTrapDispatchProtocolGuid = EFI_SMM_IO_TRAP_DISPATCH_PROTOCOL_GUID;
DTS_INIT_STATUS_PROTOCOL mDtsInitStatusProtocol;

//
// Global variables
//
EFI_SMM_BASE_PROTOCOL *mSmmBase;
EFI_SMM_SYSTEM_TABLE  *mSmst;

EFI_GLOBAL_NVS_AREA *mGlobalNvsAreaPtr;
UINT8               DTSSetupValue;

BOOLEAN mDtsEnabled;
UINT8   mDtsTjMax;
UINT16  mAcpiBaseAddr;
BOOLEAN mUpdateDtsInEverySmi;
UINT8   mNoOfThresholdRanges;
UINT8                             (*mDtsThresholdTable)[3];
UINT8 gIsPackageTempMsrAvailable;
///
/// The table is updated for the current CPU.
///
UINT8 mDigitalThermalSensorThresholdTable[DTS_NUMBER_THRESHOLD_RANGES][3] = {
  ///
  /// TJ_MAX = 110                ///< Current Temp.  Low Temp. High Temp.
  ///
  {TJ_MAX-80,100,75},     ///<    <= 30            10       35
  {TJ_MAX-70,85,65},      ///< 30  ~ 39            25       45
  {TJ_MAX-60,75,55},      ///< 40  ~ 49            35       55
  {TJ_MAX-50,65,45},      ///< 50  ~ 59            45       65
  {TJ_MAX-40,55,35},      ///< 60  ~ 69            55       75
  {TJ_MAX-30,45,25},      ///< 70  ~ 79            65       85
  {TJ_MAX-20,35,15},      ///< 80  ~ 89            75       95
  {TJ_MAX-10,25,05},      ///< 90  ~ 99            85       105
  {TJ_MAX-00,15,00}       ///< 100 ~ 109           95       110
};

//
// Function implementations
//
/**
  Read the temperature data per core/thread.
  This function must be AP safe.

  @param[in] Buffer        Pointer to UINT8 to update with the current temperature

  @retval EFI_SUCCESS   Digital Thermal Sensor temperature has updated successfully.
**/
VOID
EFIAPI
DigitalThermalSensorUpdateTemperature (
  VOID *Buffer
  )
{
  MSR_REGISTER       MsrData;
  UINT8              Temperature;
  UINT8              DefApicId;
  EFI_CPUID_REGISTER CpuidRegisters;
  UINT8              *TempPointer;

  AsmCpuid (
          EFI_CPUID_VERSION_INFO,
          &CpuidRegisters.RegEax,
          &CpuidRegisters.RegEbx,
          &CpuidRegisters.RegEcx,
          &CpuidRegisters.RegEdx
          );
  ///
  /// Default APIC ID = CPUID Function 01, EBX[31:24]
  ///
  DefApicId = (UINT8) RShiftU64 (CpuidRegisters.RegEbx, 24);

  ///
  /// Read the temperature
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_THERM_STATUS);

  ///
  /// Find the DTS temperature.
  ///
  Temperature = mDtsTjMax - (MsrData.Bytes.ThirdByte & OFFSET_MASK);
  ///
  /// We only update the temperature if it is above the current temperature.
  ///
  TempPointer = Buffer;
  if (Temperature > *((UINT8 *) (TempPointer + DefApicId))) {
    *((UINT8 *) (TempPointer + DefApicId)) = Temperature;
  }

  return;
}

/**
  Read the temperature and update the data for PTID support.

  @retval EFI_SUCCESS   Digital Thermal Sensor temperature has updated successfully.
**/
EFI_STATUS
DigitalThermalSensorUpdatePTID (
  VOID
  )
{
  ///
  /// ThreadTemperatureBuffer[0], [2], [4] and [6] are Thread0 and [1], [3], [5] and [7] are Thread1 for each Core.
  /// If thread or core not active, this thread/core temperature will be reported as 0
  ///
  UINT8 ThreadTemperatureBuffer[MAX_NUMBER_OF_THREADS_SUPPORTED];
  UINT8 Index;
  UINT8 CoreTemp[MAX_NUMBER_OF_THREADS_SUPPORTED / 2];

  ///
  /// Get DTS temperature for all cores/threads.
  ///
  for (Index = 0; Index < MAX_NUMBER_OF_THREADS_SUPPORTED; Index++) {
    ThreadTemperatureBuffer[Index] = 0;
  }

  RunOnAllLogicalProcessors (DigitalThermalSensorUpdateTemperature, ThreadTemperatureBuffer);
  ///
  /// Compare thread1 and thread2 temperature in each core and only report higher temperature as core temperature.
  ///
  for (Index = 0; Index < MAX_NUMBER_OF_THREADS_SUPPORTED; Index += 2) {
    CoreTemp[(UINT8) DivU64x32 (Index, 2)] =
            (ThreadTemperatureBuffer[Index] > ThreadTemperatureBuffer[Index + 1])
            ? ThreadTemperatureBuffer[Index] : ThreadTemperatureBuffer[Index + 1];
  }

  mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature = CoreTemp[0];
  if ((MAX_NUMBER_OF_THREADS_SUPPORTED / 2) > 1) {
    mGlobalNvsAreaPtr->ApDigitalThermalSensorTemperature = CoreTemp[1];
  }

  if ((MAX_NUMBER_OF_THREADS_SUPPORTED / 2) > 2) {
    mGlobalNvsAreaPtr->Ap2DigitalThermalSensorTemperature = CoreTemp[2];
  }

  if ((MAX_NUMBER_OF_THREADS_SUPPORTED / 2) > 3) {
    mGlobalNvsAreaPtr->Ap3DigitalThermalSensorTemperature = CoreTemp[3];
  }

  return EFI_SUCCESS;
}

/**
  SMI handler to handle Digital Thermal Sensor CPU Local APIC SMI
  for thermal Out Of Spec interrupt

  @param[in] SmmImageHandle        Image handle returned by the SMM driver.
  @param[in] CommunicationBuffer   Pointer to the buffer that contains the communication Message
  @param[in] SourceSize            Size of the memory image to be used for handler.

  @retval EFI_SUCCESS           Callback Function Executed
**/
EFI_STATUS
EFIAPI
DtsOutOfSpecSmiCallback (
  IN EFI_HANDLE SmmImageHandle,
  IN OUT VOID   *CommunicationBuffer,
  IN OUT UINTN  *SourceSize
  )
{

  DTS_EVENT_TYPE EventType;

  ///
  /// If not enabled; return.  (The DTS will be disabled upon S3 entry
  /// and will remain disabled until after re-initialized upon wake.)
  ///
  if (!mDtsEnabled) {
    return EFI_SUCCESS;
  }

  EventType = DtsEventNone;

  if (gIsPackageTempMsrAvailable) {
    ///
    /// Get the Package DTS Event Type
    ///
    DigitalThermalSensorEventCheckPackageMsr (&EventType);
  } else {
    ///
    /// Get the DTS Event Type
    ///
    DigitalThermalSensorEventCheck (&EventType);
  }
  ///
  /// Check if this a DTS Out Of Spec SMI event
  ///
  if (EventType == DtsEventOutOfSpec) {
    ///
    /// Return Critical temperature value to _TMP and generate GPE event for critical shutdown.
    ///
    mGlobalNvsAreaPtr->EnableDigitalThermalSensor = DTS_OUT_OF_SPEC_OCCURRED;

    ///
    /// Generate SCI to shut down the system
    ///
    DigitalThermalSensorSetSwGpeSts ();
  }

  return EFI_SUCCESS;
}

/**
  Call from SMI handler to handle Package thermal temperature Digital Thermal Sensor CPU Local APIC SMI
  for thermal threshold interrupt

  @retval None
**/
VOID
PackageThermalDTS (
  VOID
  )
{
  DTS_EVENT_TYPE PkgEventType;

  PkgEventType = DtsEventNone;

  ///
  /// Check is this a Platform SMI event or the flag of update DTS temperature and threshold value in every SMI
  ///
  if (DigitalThermalSensorEventCheckPackageMsr (&PkgEventType) || mUpdateDtsInEverySmi) {
    ///
    /// Disable Local APIC SMI before programming the threshold
    ///
    RunOnAllLogicalProcessors (DigitalThermalSensorDisableSmi, NULL);

    do {
      ///
      /// Handle Package events
      ///
      if ((PkgEventType == DtsEventOutOfSpec) && (mGlobalNvsAreaPtr->OperatingSystem == 0)) {
        ///
        /// Handle critical event by shutting down via EC if ACPI
        /// is not enabled.
        ///
        PlatformEventOutOfSpec ();
      }
      ///
      /// Set the thermal trip toints as needed.
      ///
      mGlobalNvsAreaPtr->PackageDTSTemperature = 0;

      ///
      /// Set the Package thermal sensor thresholds
      ///
      PackageDigitalThermalSensorSetThreshold (&mGlobalNvsAreaPtr->PackageDTSTemperature);

      ///
      /// Set SWGPE Status to generate an SCI if we had any events
      ///
      if ((PkgEventType != DtsEventNone) || mUpdateDtsInEverySmi) {
        DigitalThermalSensorSetSwGpeSts ();
      }

    } while (DigitalThermalSensorEventCheckPackageMsr (&PkgEventType));
    ///
    /// Enable Local APIC SMI on all logical processors
    ///
    RunOnAllLogicalProcessors (DigitalThermalSensorEnableSmi, NULL);
  }
}

/**
  SMI handler to handle Digital Thermal Sensor CPU Local APIC SMI
  for thermal threshold interrupt

  @param[in] SmmImageHandle        Image handle returned by the SMM driver.
  @param[in] CommunicationBuffer   Pointer to the buffer that contains the communication Message
  @param[in] SourceSize            Size of the memory image to be used for handler.

  @retval EFI_SUCCESS           Callback Function Executed
**/
EFI_STATUS
EFIAPI
DtsSmiCallback (
  IN EFI_HANDLE SmmImageHandle,
  IN OUT VOID   *CommunicationBuffer,
  IN OUT UINTN  *SourceSize
  )
{
  UINTN          Index;
  DTS_EVENT_TYPE EventType;
  ///
  /// If not enabled; return.  (The DTS will be disabled upon S3 entry
  /// and will remain disabled until after re-initialized upon wake.)
  ///
  if (!mDtsEnabled) {
    return EFI_SUCCESS;
  }
  ///
  /// Get the Package thermal temperature
  ///
  if (gIsPackageTempMsrAvailable) {
    RunOnAllLogicalProcessors (DigitalThermalSensorEnableSmi, NULL);
    PackageThermalDTS ();
  } else {
    ///
    /// We enable the Thermal interrupt on the AP's prior to the event check
    /// for the case where the AP has gone through the INIT-SIPI-SIPI sequence
    /// and does not have the interrupt enabled.  (This allows the AP thermal
    /// interrupt to be re-enabled due to chipset-based SMIs without waiting
    /// to receive a DTS event on the BSP.)
    ///
    for (Index = 1; Index < mSmst->NumberOfCpus; Index++) {
      RunOnSpecificLogicalProcessor (DigitalThermalSensorEnableSmi, Index, NULL);
    }
    ///
    /// Check is this a DTS SMI event or the flag of update DTS temperature and threshold value in every SMI
    ///
    if (DigitalThermalSensorEventCheck (&EventType) || mUpdateDtsInEverySmi) {
      ///
      /// Disable Local APIC SMI before programming the threshold
      ///
      RunOnAllLogicalProcessors (DigitalThermalSensorDisableSmi, NULL);

      do {
        ///
        /// Handle BSP events
        ///
        if ((EventType == DtsEventOutOfSpec) && (mGlobalNvsAreaPtr->OperatingSystem == 0)) {
          ///
          /// Handle critical event by shutting down via EC if ACPI
          /// is not enabled.
          ///
          PlatformEventOutOfSpec ();
        }
        ///
        /// Update temperatures for PTID
        ///
        DigitalThermalSensorUpdatePTID ();

        ///
        /// Set the thermal trip toints as needed.
        /// Note:  We only save the highest temperature of each die in
        /// the NVS area when more than two logical processors are
        /// present as only the highest DTS reading is actually used by
        /// the current ASL solution.
        ///
        mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature = 0;
        mGlobalNvsAreaPtr->ApDigitalThermalSensorTemperature  = 0;

        ///
        /// Set the BSP thermal sensor thresholds
        ///
        DigitalThermalSensorSetThreshold (&mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature);

        ///
        /// Set the AP thermal sensor thresholds and update temperatures
        ///
        for (Index = 1; Index < mSmst->NumberOfCpus / 2; Index++) {
          RunOnSpecificLogicalProcessor (
                  DigitalThermalSensorSetThreshold,
                  Index,
                  &mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature
                  );
        }

        for (Index = mSmst->NumberOfCpus / 2; Index < mSmst->NumberOfCpus; Index++) {
          RunOnSpecificLogicalProcessor (
                  DigitalThermalSensorSetThreshold,
                  Index,
                  &mGlobalNvsAreaPtr->ApDigitalThermalSensorTemperature
                  );
        }
        ///
        /// Set SWGPE Status to generate an SCI if we had any events
        ///
        if ((EventType != DtsEventNone) || mUpdateDtsInEverySmi) {
          DigitalThermalSensorSetSwGpeSts ();
        }

      } while (DigitalThermalSensorEventCheck (&EventType));
      ///
      /// Enable Local APIC SMI on all logical processors
      ///
      RunOnAllLogicalProcessors (DigitalThermalSensorEnableSmi, NULL);
    }
  }

  return EFI_SUCCESS;
}

/**
  This catches IO trap SMI generated by the ASL code to enable the DTS AP function

  @param[in] DispatchHandle      Not used
  @param[in] CallbackContext     Not used
**/
VOID
EFIAPI
DtsIoTrapCallback (
  IN EFI_HANDLE                                DispatchHandle,
  IN EFI_SMM_IO_TRAP_DISPATCH_CALLBACK_CONTEXT *CallbackContext
  )
{
  UINTN      Index;
  EFI_STATUS Status;
  UINT8      RetryIteration;

  ///
  /// Determine the function desired, passed in the global NVS area
  ///
  switch (mGlobalNvsAreaPtr->DigitalThermalSensorSmiFunction) {
    ///
    /// Enable AP Digital Thermal Sensor function after resume from S3
    ///
    case IO_TRAP_INIT_DTS_FUNCTION_AFTER_S3:
      ///
      /// Enable the Package DTS on the processors.
      ///
      if (gIsPackageTempMsrAvailable) {
        PackageDigitalThermalSensorEnable (NULL);
      } else {
        ///
        /// Enable the DTS on all logical processors.
        ///
        RunOnAllLogicalProcessors (DigitalThermalSensorEnable, NULL);
      }

      if (DTSSetupValue != DTS_OUT_OF_SPEC_ONLY) {
        ///
        /// Set the thermal trip toints on all logical processors.
        /// Note:  We only save the highest temperature of each die in the NVS area when
        /// more than two logical processors are present as only the highest DTS reading
        /// is actually used by the current ASL solution.
        ///
        mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature = 0;
        mGlobalNvsAreaPtr->ApDigitalThermalSensorTemperature  = 0;
        mGlobalNvsAreaPtr->PackageDTSTemperature              = 0;

        if (gIsPackageTempMsrAvailable) {
          PackageDigitalThermalSensorSetThreshold (&mGlobalNvsAreaPtr->PackageDTSTemperature);
        } else {
          ///
          /// Update temperatures for PTID
          ///
          DigitalThermalSensorUpdatePTID ();
          mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature = 0;
          mGlobalNvsAreaPtr->ApDigitalThermalSensorTemperature  = 0;
  DigitalThermalSensorSetThreshold (&mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature);

          for (Index = 1; Index < mSmst->NumberOfCpus / 2; Index++) {
            Status = EFI_NOT_READY;
            for (RetryIteration = 0;
                 (RetryIteration < DTS_AP_SAFE_RETRY_LIMIT) && (Status != EFI_SUCCESS);
                 RetryIteration++
                 ) {
  Status = mSmst->SmmStartupThisAp (
                              DigitalThermalSensorSetThreshold,
                              Index,
                              &mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature
                              );
              if (Status != EFI_SUCCESS) {
                ///
                /// SmmStartupThisAp might return failure if AP is busy executing some other code. Let's wait for sometime and try again.
                ///
                PchPmTimerStall (DTS_WAIT_PERIOD);
              }
            }
          }

          for (Index = mSmst->NumberOfCpus / 2; Index < mSmst->NumberOfCpus; Index++) {
            RunOnSpecificLogicalProcessor (
                    DigitalThermalSensorSetThreshold,
                    Index,
                    &mGlobalNvsAreaPtr->ApDigitalThermalSensorTemperature
                    );
          }
        }
        ///
        /// Re-enable the DTS.
        ///
        mGlobalNvsAreaPtr->EnableDigitalThermalSensor = CPU_FEATURE_ENABLE;
      } else {
        ///
        /// Enable Out Of Spec Interrupt
        ///
        if (gIsPackageTempMsrAvailable) {
          PackageDigitalThermalSensorSetOutOfSpecInterrupt (NULL);
        } else {
          RunOnAllLogicalProcessors (DigitalThermalSensorSetOutOfSpecInterrupt, NULL);
        }
        ///
        /// Re-enable the DTS which only handle Out-Of-Spec condition
        ///
        mGlobalNvsAreaPtr->EnableDigitalThermalSensor = DTS_OUT_OF_SPEC_ONLY;
      }
      ///
      /// Enable the Local APIC SMI on all logical processors
      ///
      RunOnAllLogicalProcessors (DigitalThermalSensorEnableSmi, NULL);
      ///
      /// Set SWGPE Status
      ///
      DigitalThermalSensorSetSwGpeSts ();

      mUpdateDtsInEverySmi  = UPDATE_DTS_EVERY_SMI;
      mDtsEnabled           = TRUE;
      break;

    ///
    /// Disable update DTS temperature and threshold value in every SMI
    ///
    case IO_TRAP_DISABLE_UPDATE_DTS:
      mUpdateDtsInEverySmi = FALSE;
      break;

    default:
      break;
  }
  ///
  /// Store return value
  ///
  mGlobalNvsAreaPtr->DigitalThermalSensorSmiFunction = 0;
}

/**
  This function executes DTS procedures for preparing to enter S3.

  @param[in] Handle    Handle of the callback
  @param[in] Context   The dispatch context

  @retval EFI_SUCCESS        DTS disabled
**/
VOID
EFIAPI
DtsS3EntryCallBack (
  IN EFI_HANDLE                  Handle,
  IN EFI_SMM_SX_DISPATCH_CONTEXT *Context
  )
{
  ///
  /// Clear the Digital Thermal Sensor flag in ACPI NVS.
  ///
  mGlobalNvsAreaPtr->EnableDigitalThermalSensor = CPU_FEATURE_DISABLE;
  ///
  /// Clear the enable flag.
  ///
  mDtsEnabled = FALSE;

  return;
}

/**
  Performs initialization of the threshold table.

  @todo Update this function as necessary for the tables used by the implementation.

  @retval EFI_SUCCESS  Threshold tables initialized successfully.
**/
EFI_STATUS
ThresholdTableInit (
  VOID
  )
{
  UINTN i;
  UINT8 Delta;

  ///
  /// If the table must be updated, shift the thresholds by the difference between
  /// TJ_MAX=110 and DtsTjMax.
  ///
  if (mDtsTjMax != TJ_MAX) {
    Delta = TJ_MAX - mDtsTjMax;

    for (i = 0; i < mNoOfThresholdRanges; i++) {
      if (mDtsThresholdTable[i][1] <= mDtsTjMax) {
        mDtsThresholdTable[i][0] = mDtsThresholdTable[i][0] - Delta;
      } else {
        mDtsThresholdTable[i][0] = 0;
      }
    }
  }

  return EFI_SUCCESS;
}

/**
  Perform first time initialization of the Digital Thermal Sensor

  @retval EFI_SUCCESS  Init Digital Thermal Sensor successfully
**/
EFI_STATUS
DigitalThermalSensorInit (
  VOID
  )
{
  UINTN Index;

  if (DTSSetupValue != DTS_OUT_OF_SPEC_ONLY) {
    ///
    /// Initialize the DTS threshold table.
    ///
    ThresholdTableInit ();

    ///
    /// Set the thermal trip points on all logical processors.
    /// Note:  We only save the highest temperature of each die in the NVS area when
    /// more than two logical processors are present as only the highest DTS reading
    /// is actually used by the current ASL solution.
    ///
    mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature = 0;
    mGlobalNvsAreaPtr->ApDigitalThermalSensorTemperature  = 0;
    mGlobalNvsAreaPtr->PackageDTSTemperature              = 0;
    if (gIsPackageTempMsrAvailable) {
      PackageDigitalThermalSensorSetThreshold (&mGlobalNvsAreaPtr->PackageDTSTemperature);
    } else {
      ///
      /// Update temperatures for PTID
      ///
      DigitalThermalSensorUpdatePTID ();
      mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature = 0;
      mGlobalNvsAreaPtr->ApDigitalThermalSensorTemperature  = 0;
      DigitalThermalSensorSetThreshold (&mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature);

      for (Index = 1; Index < mSmst->NumberOfCpus / 2; Index++) {
        RunOnSpecificLogicalProcessor (
                DigitalThermalSensorSetThreshold,
                Index,
                &mGlobalNvsAreaPtr->BspDigitalThermalSensorTemperature
                );
      }

      for (Index = mSmst->NumberOfCpus / 2; Index < mSmst->NumberOfCpus; Index++) {
        RunOnSpecificLogicalProcessor (
                DigitalThermalSensorSetThreshold,
                Index,
                &mGlobalNvsAreaPtr->ApDigitalThermalSensorTemperature
                );
      }
    }

    mGlobalNvsAreaPtr->EnableDigitalThermalSensor = CPU_FEATURE_ENABLE;
  } else {
    ///
    /// Enable Out Of Spec Interrupt
    ///
    if (gIsPackageTempMsrAvailable) {
      PackageDigitalThermalSensorSetOutOfSpecInterrupt (NULL);
    } else {
      RunOnAllLogicalProcessors (DigitalThermalSensorSetOutOfSpecInterrupt, NULL);
    }

    mGlobalNvsAreaPtr->EnableDigitalThermalSensor = DTS_OUT_OF_SPEC_ONLY;
  }
  ///
  /// Enable the Local APIC SMI on all logical processors
  ///
  RunOnAllLogicalProcessors (DigitalThermalSensorEnableSmi, NULL);
  ///
  /// Set Digital Thermal Sensor flag in ACPI NVS
  ///
  mUpdateDtsInEverySmi  = UPDATE_DTS_EVERY_SMI;
  mDtsEnabled           = TRUE;

  return EFI_SUCCESS;
}

/**
  Initializes the Thermal Sensor Control MSR

  This function must be AP safe.

  @param[in] Buffer        Unused.

  @retval EFI_SUCCESS   The function completed successfully.
**/
VOID
EFIAPI
DigitalThermalSensorEnable (
  VOID *Buffer
  )
{
  MSR_REGISTER MsrData;

  ///
  /// First, clear our log bits
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_THERM_STATUS);
  if (DTSSetupValue != DTS_OUT_OF_SPEC_ONLY) {
    MsrData.Qword &= ~THERM_STATUS_LOG_MASK;
  } else {
    MsrData.Qword &= ~B_OUT_OF_SPEC_STATUS_LOG;
  }

  AsmWriteMsr64 (EFI_MSR_IA32_THERM_STATUS, MsrData.Qword);

  ///
  /// Second, configure the thermal sensor control
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_MISC_PWR_MGMT);

  ///
  /// Only lock interrupts if in CMP mode
  ///
  if (mSmst->NumberOfCpus > 1) {
    MsrData.Qword |= B_LOCK_THERMAL_INT;
  }

  AsmWriteMsr64 (EFI_MSR_MISC_PWR_MGMT, MsrData.Qword);

  return;
}

/**
  Initializes the Package Thermal Sensor Control MSR

  @param[in] Buffer        Unused.

  @retval EFI_SUCCESS   The function completed successfully.
**/
EFI_STATUS
PackageDigitalThermalSensorEnable (
  VOID *Buffer
  )
{
  MSR_REGISTER MsrData;

  ///
  /// First, clear our log bits
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_PACKAGE_THERM_STATUS);
  if (DTSSetupValue != DTS_OUT_OF_SPEC_ONLY) {
    MsrData.Qword &= ~THERM_STATUS_LOG_MASK;
  } else {
    MsrData.Qword &= ~B_OUT_OF_SPEC_STATUS_LOG;
  }

  AsmWriteMsr64 (EFI_MSR_IA32_PACKAGE_THERM_STATUS, MsrData.Qword);

  ///
  /// Second, configure the thermal sensor control
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_MISC_PWR_MGMT);

  ///
  /// Only lock interrupts if in CMP mode
  ///
  if (mSmst->NumberOfCpus > 1) {
    MsrData.Qword |= B_LOCK_THERMAL_INT;
  }

  AsmWriteMsr64 (EFI_MSR_MISC_PWR_MGMT, MsrData.Qword);

  return EFI_SUCCESS;
}

/**
  Generates a _GPE._L02 SCI to an ACPI OS.
**/
VOID
DigitalThermalSensorSetSwGpeSts (
  VOID
  )
{
  UINT8 GpeCntl;

  ///
  /// Check SCI enable
  ///
  if (((SmmIoRead8 (mAcpiBaseAddr + R_PCH_ACPI_PM1_CNT)) & B_PCH_ACPI_PM1_CNT_SCI_EN) != 0) {
    ///
    /// Do platform specific things before generate SCI
    ///
    PlatformHookBeforeGenerateSCI ();

    ///
    /// Set SWGPE Status
    ///
    GpeCntl = SmmIoRead8 (mAcpiBaseAddr + R_ACPI_GPE_CNTL);
    GpeCntl |= B_SWGPE_CTRL;
    SmmIoWrite8 (mAcpiBaseAddr + R_ACPI_GPE_CNTL, GpeCntl);
  }
}

/**
  Checks for a Core Thermal Event on any processor

  @param[in] EventType - DTS_EVENT_TYPE to indicate which DTS event type has been detected.

  @retval TRUE means this is a DTS Thermal event
  @retval FALSE means this is not a DTS Thermal event.
**/
BOOLEAN
DigitalThermalSensorEventCheck (
  DTS_EVENT_TYPE *EventType
  )
{
  ///
  /// Clear event status
  ///
  *EventType = DtsEventNone;

  RunOnAllLogicalProcessors (DigitalThermalSensorEventCheckMsr, EventType);
  ///
  /// Return TRUE if any logical processor reported an event.
  ///
  if (*EventType != DtsEventNone) {
    return TRUE;
  }

  return FALSE;
}

/**
  Checks for a Package Thermal Event by reading MSR.

  @param[in] PkgEventType - DTS_EVENT_TYPE to indicate which DTS event type has been detected.

  @retval TRUE means this is a Package DTS Thermal event
  @retval FALSE means this is not a Package DTS Thermal event.
**/
BOOLEAN
DigitalThermalSensorEventCheckPackageMsr (
  DTS_EVENT_TYPE *PkgEventType
  )
{
  MSR_REGISTER MsrData;

  ///
  /// Clear event status
  ///
  *PkgEventType = DtsEventNone;

  ///
  /// If Processor has already been flagged as Out-Of-Spec,
  /// just return.
  ///
  if (*PkgEventType != DtsEventOutOfSpec) {
    ///
    /// Read thermal status
    ///
    MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_PACKAGE_THERM_STATUS);

    ///
    /// Check for Out-Of-Spec status.
    ///
    if (MsrData.Qword & B_OUT_OF_SPEC_STATUS_LOG) {
      *PkgEventType = DtsEventOutOfSpec;

      ///
      /// Check thresholds.
      ///
    } else if ((DTSSetupValue != DTS_OUT_OF_SPEC_ONLY) &&
               (MsrData.Qword & (B_THERMAL_THRESHOLD_1_STATUS_LOG | B_THERMAL_THRESHOLD_2_STATUS_LOG))
               ) {
      *PkgEventType = DtsEventThreshold;
    }
  }
  ///
  /// Return TRUE if processor reported an event.
  ///
  if (*PkgEventType != DtsEventNone) {
    return TRUE;
  }

  return FALSE;

}

/**
  Checks for a Core Thermal Event by reading MSR.

  This function must be MP safe.

  @param[in] Buffer    Pointer to DTS_EVENT_TYPE
**/
VOID
EFIAPI
DigitalThermalSensorEventCheckMsr (
  IN VOID *Buffer
  )
{
  MSR_REGISTER   MsrData;
  DTS_EVENT_TYPE *EventType;

  ///
  /// Cast to enhance readability.
  ///
  EventType = (DTS_EVENT_TYPE *) Buffer;

  ///
  /// If any processor has already been flagged as Out-Of-Spec,
  /// just return.
  ///
  if (*EventType != DtsEventOutOfSpec) {
    ///
    /// Read thermal status
    ///
    MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_THERM_STATUS);

    ///
    /// Check for Out-Of-Spec status.
    ///
    if (MsrData.Qword & B_OUT_OF_SPEC_STATUS_LOG) {
      *EventType = DtsEventOutOfSpec;

      ///
      /// Check thresholds.
      ///
    } else if ((DTSSetupValue != DTS_OUT_OF_SPEC_ONLY) &&
               (MsrData.Qword & (B_THERMAL_THRESHOLD_1_STATUS_LOG | B_THERMAL_THRESHOLD_2_STATUS_LOG))
               ) {
      *EventType = DtsEventThreshold;
    }
  }
}

/**
  Set the Out Of Spec Interrupt in all cores
  This function must be AP safe.

  @param[in] Buffer        Unused

  @retval EFI_SUCCESS   Out Of Spec Interrupt programmed successfully
**/
VOID
EFIAPI
DigitalThermalSensorSetOutOfSpecInterrupt (
  VOID *Buffer
  )
{
  MSR_REGISTER MsrData;

  ///
  /// Enable Out Of Spec interrupt
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_THERM_INTERRUPT);
  MsrData.Qword |= OVERHEAT_INTERRUPT_ENABLE;
  AsmWriteMsr64 (EFI_MSR_IA32_THERM_INTERRUPT, MsrData.Qword);

  return;

}

/**
  Set the Out Of Spec Interrupt on the package

  @param[in] Buffer        Unused

  @retval EFI_SUCCESS   Out Of Spec Interrupt programmed successfully
**/
EFI_STATUS
PackageDigitalThermalSensorSetOutOfSpecInterrupt (
  VOID *Buffer
  )
{
  MSR_REGISTER MsrData;

  ///
  /// Enable Out Of Spec interrupt
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_PACKAGE_THERM_INTERRUPT);
  MsrData.Qword |= OVERHEAT_INTERRUPT_ENABLE;
  AsmWriteMsr64 (EFI_MSR_IA32_PACKAGE_THERM_INTERRUPT, MsrData.Qword);

  return EFI_SUCCESS;

}

/**
  Read the temperature and reconfigure the thresholds.
  This function must be AP safe.

  @param[in] Buffer        Pointer to UINT8 to update with the current temperature

  @retval EFI_SUCCESS   Digital Thermal Sensor threshold programmed successfully
**/
VOID
EFIAPI
DigitalThermalSensorSetThreshold (
  VOID *Buffer
  )
{
  INT8         ThresholdEntry;
  MSR_REGISTER MsrData;
  UINT8        Temperature;

  ///
  /// Read the temperature
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_THERM_STATUS);

  ///
  /// If Out-Of-Spec, return the critical shutdown temperature.
  ///
  if (MsrData.Qword & B_OUT_OF_SPEC_STATUS) {
    *((UINT8 *) Buffer) = DTS_CRITICAL_TEMPERATURE;
    return;
  } else if (MsrData.Qword & B_READING_VALID) {
    ///
    /// Find the DTS temperature.
    ///
    Temperature = mDtsTjMax - (MsrData.Bytes.ThirdByte & OFFSET_MASK);
    ///
    /// We only update the temperature if it is above the current temperature.
    ///
    if (Temperature > *((UINT8 *) Buffer)) {
      *((UINT8 *) Buffer) = Temperature;
    }
    ///
    /// Compare the current temperature to the Digital Thermal Sensor Threshold Table until
    /// a matching Value is found.
    ///
    ThresholdEntry = 0;
    while ((Temperature > mDtsThresholdTable[ThresholdEntry][0]) && (ThresholdEntry < (mNoOfThresholdRanges - 1))) {
      ThresholdEntry++;
    }
    ///
    /// Update the threshold values
    ///
    MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_THERM_INTERRUPT);
    ///
    /// Low temp is threshold #2
    ///
    MsrData.Bytes.ThirdByte = mDtsThresholdTable[ThresholdEntry][1];
    ///
    /// High temp is threshold #1
    ///
    MsrData.Bytes.SecondByte = mDtsThresholdTable[ThresholdEntry][2];

    ///
    /// Enable interrupts
    ///
    MsrData.Qword |= TH1_ENABLE;
    MsrData.Qword |= TH2_ENABLE;

    ///
    /// If the high temp is at TjMax (offset == 0)
    /// We disable the int to avoid generating a large number of SMI because of TM1/TM2
    /// causing many threshold crossings
    ///
    if (MsrData.Bytes.SecondByte == 0x80) {
      MsrData.Qword &= ~TH1_ENABLE;
    }

    AsmWriteMsr64 (EFI_MSR_IA32_THERM_INTERRUPT, MsrData.Qword);
  }
  ///
  ///  Clear the threshold log bits
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_THERM_STATUS);
  MsrData.Qword &= ~THERM_STATUS_THRESHOLD_LOG_MASK;
  AsmWriteMsr64 (EFI_MSR_IA32_THERM_STATUS, MsrData.Qword);

  return;
}

/**
  Read the temperature and reconfigure the thresholds on the package

  @param[in] Buffer        Pointer to UINT8 to update with the current temperature

  @retval EFI_SUCCESS   Digital Thermal Sensor threshold programmed successfully
**/
EFI_STATUS
PackageDigitalThermalSensorSetThreshold (
  VOID *Buffer
  )
{
  INT8         ThresholdEntry;
  MSR_REGISTER MsrData;
  UINT8        Temperature;

  ///
  /// Read the temperature
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_PACKAGE_THERM_STATUS);

  ///
  /// If Out-Of-Spec, return the critical shutdown temperature.
  ///
  if (MsrData.Qword & B_OUT_OF_SPEC_STATUS) {
    *((UINT8 *) Buffer) = DTS_CRITICAL_TEMPERATURE;
    return EFI_SUCCESS;
  } else if (MsrData.Qword & B_READING_VALID) {
    ///
    /// Update temperatures for PTID
    ///
    DigitalThermalSensorUpdatePTID ();

    ///
    /// Find the DTS temperature.
    ///
    Temperature = mDtsTjMax - (MsrData.Bytes.ThirdByte & OFFSET_MASK);
    ///
    /// We only update the temperature if it is above the current temperature.
    ///
    if (Temperature > *((UINT8 *) Buffer)) {
      *((UINT8 *) Buffer) = Temperature;
    }
    ///
    /// Compare the current temperature to the Digital Thermal Sensor Threshold Table until
    /// a matching Value is found.
    ///
    ThresholdEntry = 0;
    while ((Temperature > mDtsThresholdTable[ThresholdEntry][0]) && (ThresholdEntry < (mNoOfThresholdRanges - 1))) {
      ThresholdEntry++;
    }
    ///
    /// Update the threshold values
    ///
    MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_PACKAGE_THERM_INTERRUPT);
    ///
    /// Low temp is threshold #2
    ///
    MsrData.Bytes.ThirdByte = mDtsThresholdTable[ThresholdEntry][1];
    ///
    /// High temp is threshold #1
    ///
    MsrData.Bytes.SecondByte = mDtsThresholdTable[ThresholdEntry][2];

    ///
    /// Enable interrupts
    ///
    MsrData.Qword |= TH1_ENABLE;
    MsrData.Qword |= TH2_ENABLE;

    ///
    /// If the high temp is at TjMax (offset == 0)
    /// We disable the int to avoid generating a large number of SMI because of TM1/TM2
    /// causing many threshold crossings
    ///
    if (MsrData.Bytes.SecondByte == 0x80) {
      MsrData.Qword &= ~TH1_ENABLE;
    }

    AsmWriteMsr64 (EFI_MSR_IA32_PACKAGE_THERM_INTERRUPT, MsrData.Qword);
  }
  ///
  ///  Clear the threshold log bits
  ///
  MsrData.Qword = AsmReadMsr64 (EFI_MSR_IA32_PACKAGE_THERM_STATUS);
  MsrData.Qword &= ~THERM_STATUS_THRESHOLD_LOG_MASK;
  AsmWriteMsr64 (EFI_MSR_IA32_PACKAGE_THERM_STATUS, MsrData.Qword);

  return EFI_SUCCESS;
}

/**
  Enables the Thermal Interrupt in the core Local APIC.

  @param[in] Buffer        Unused

  @retval EFI_SUCCESS   Enable Local APIC to generate a SMI successfully
**/
VOID
EFIAPI
DigitalThermalSensorEnableSmi (
  VOID *Buffer
  )
{
  UINT32  ApicThermalValue;
  BOOLEAN x2ApicEnabled;

  x2ApicEnabled = (BOOLEAN) (((AsmReadMsr64 (EFI_MSR_XAPIC_BASE)) & (BIT11 + BIT10)) == BIT11 + BIT10);
  ///
  /// Configure the Local APIC to generate an SMI on Thermal events.  First,
  /// Clear BIT16, BIT10-BIT8, BIT7-BIT0.  Then, set BIT9 (delivery mode).
  /// Don't enable the interrupt if it's already enabled
  ///
  if (x2ApicEnabled) {
    ApicThermalValue = (UINT32) AsmReadMsr64 (EFI_MSR_EXT_XAPIC_LVT_THERM);
  } else {
    ApicThermalValue = *(UINT32 *) (UINTN) LOCAL_APIC_THERMAL_DEF;
  }

  if ((ApicThermalValue & (B_INTERRUPT_MASK | B_DELIVERY_MODE | B_VECTOR)) != V_MODE_SMI) {
    ApicThermalValue = (ApicThermalValue &~(B_INTERRUPT_MASK | B_DELIVERY_MODE | B_VECTOR)) | V_MODE_SMI;
    if (x2ApicEnabled) {
      AsmWriteMsr64 (EFI_MSR_EXT_XAPIC_LVT_THERM, ApicThermalValue);
    } else {
      *(UINT32 *) (UINTN) (LOCAL_APIC_THERMAL_DEF) = (UINT32) ApicThermalValue;
    }
  }

  return;
}

/**
  Disables the Thermal Interrupt in the core Local APIC.

  @param[in] Buffer        Unused

  @retval EFI_SUCCESS   Disable Local APIC to generate a SMI successfully
**/
VOID
EFIAPI
DigitalThermalSensorDisableSmi (
  VOID *Buffer
  )
{
  UINT32  ApicThermalValue;
  BOOLEAN x2ApicEnabled;

  x2ApicEnabled = (BOOLEAN) (((AsmReadMsr64 (EFI_MSR_XAPIC_BASE)) & (BIT11 + BIT10)) == BIT11 + BIT10);
  ///
  /// Disable Local APIC thermal entry
  ///
  if (x2ApicEnabled) {
    ApicThermalValue = (UINT32) AsmReadMsr64 (EFI_MSR_EXT_XAPIC_LVT_THERM);
  } else {
    ApicThermalValue = *(UINT32 *) (UINTN) LOCAL_APIC_THERMAL_DEF;
  }
  ///
  /// Following descriptions were from SSE BIOS
  /// We set the interrupt mode at the same time as the interrupt is disabled to
  /// avoid the "Received Illegal Vector" being set in the Error Status Register.
  ///  and eax, 0FFFEF800h
  ///  or  eax, 000010200h     ; Clear Mask, Set Delivery
  ///
  ApicThermalValue = (ApicThermalValue &~(B_INTERRUPT_MASK | B_DELIVERY_MODE | B_VECTOR)) | (B_INTERRUPT_MASK | V_MODE_SMI);
  if (x2ApicEnabled) {
    AsmWriteMsr64 (EFI_MSR_EXT_XAPIC_LVT_THERM, ApicThermalValue);
  } else {
    *(UINT32 *) (UINTN) (LOCAL_APIC_THERMAL_DEF) = (UINT32) ApicThermalValue;
  }

  return;
}

/**
  Runs the specified procedure on all logical processors, passing in the
  parameter buffer to the procedure.

  @param[in] Procedure     The function to be run.
  @param[in] Buffer        Pointer to a parameter buffer.

  @retval EFI_SUCCESS   Function executed successfully.
**/
STATIC
EFI_STATUS
RunOnAllLogicalProcessors (
  IN OUT EFI_AP_PROCEDURE Procedure,
  IN OUT VOID             *Buffer
  )
{
  UINTN      Index;
  EFI_STATUS Status;
  UINT8      RetryIteration;
  ///
  /// Run the procedure on all logical processors.
  ///
  for (Index = 1; Index < mSmst->NumberOfCpus; Index++) {
    Status = EFI_NOT_READY;
    for (RetryIteration = 0; (RetryIteration < DTS_AP_SAFE_RETRY_LIMIT) && (Status != EFI_SUCCESS); RetryIteration++) {
      Status = mSmst->SmmStartupThisAp (Procedure, Index, Buffer);
      if (Status != EFI_SUCCESS) {
        ///
        /// SmmStartupThisAp might return failure if AP is busy executing some other code. Let's wait for sometime and try again.
        ///
        PchPmTimerStall (DTS_WAIT_PERIOD);
      }
    }
  }
  PchPmTimerStall (DTS_WAIT_PERIOD);
  (*Procedure)(Buffer);
  return EFI_SUCCESS;
}

/**
  Runs the specified procedure on one specific logical processors, passing in the
  parameter buffer to the procedure.

  @param[in] Procedure     The function to be run.
  @param[in] Index         Indicate which logical processor should execute this procedure
  @param[in] Buffer        Pointer to a parameter buffer.

  @retval EFI_SUCCESS   Function executed successfully.
**/
STATIC
EFI_STATUS
RunOnSpecificLogicalProcessor (
  IN OUT EFI_AP_PROCEDURE Procedure,
  IN UINTN                Index,
  IN OUT VOID             *Buffer
  )
{
  EFI_STATUS Status;
  UINT8      RetryIteration;
  ///
  /// Run the procedure on one specific logical processor.
  ///
  Status = EFI_NOT_READY;
  for (RetryIteration = 0; (RetryIteration < DTS_AP_SAFE_RETRY_LIMIT) && (Status != EFI_SUCCESS); RetryIteration++) {
    Status = mSmst->SmmStartupThisAp (Procedure, Index, Buffer);
    if (Status != EFI_SUCCESS) {
      ///
      /// SmmStartupThisAp might return failure if AP is busy executing some other code. Let's wait for sometime and try again.
      ///
      PchPmTimerStall (DTS_WAIT_PERIOD);
    }
  }

  return EFI_SUCCESS;
}

/**
  Digital Thermal Sensor (DTS) SMM driver entry point function.

  @param[in] ImageHandle   Image handle for this driver image
  @param[in] SystemTable   Pointer to the EFI System Table

  @retval EFI_SUCCESS   Driver initialization completed successfully
  @retval EFI_OUT_OF_RESOURCES   Error when allocating required memory buffer.
**/
EFI_STATUS
InstallDigitalThermalSensor (
  IN EFI_HANDLE       ImageHandle,
  IN EFI_SYSTEM_TABLE *SystemTable
  )
{
  EFI_STATUS                   Status;
  EFI_HANDLE                   Handle;
  MSR_REGISTER                 MsrData;
  EFI_GLOBAL_NVS_AREA_PROTOCOL *GlobalNvsAreaProtocol;
  EFI_SMM_SX_DISPATCH_CONTEXT  SxDispatchContext;
  EFI_SMM_SX_DISPATCH_PROTOCOL *SxDispatchProtocol;
  EFI_HANDLE                   SxDispatchHandle;

  EFI_SMM_IO_TRAP_DISPATCH_PROTOCOL         *PchIoTrap;
  EFI_HANDLE                                PchIoTrapHandle;
  EFI_SMM_IO_TRAP_DISPATCH_REGISTER_CONTEXT PchIoTrapContext;
  EFI_CPUID_REGISTER                        Cpuid06;

  ///
  /// Install DTS_INIT_STATUS_PROTOCOL protocol
  ///
  Handle  = NULL;
  mDtsInitStatusProtocol.IsDtsInitComplete = FALSE;
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &Handle,
                  &gDtsInitStatusProtocolGuid,
                  &mDtsInitStatusProtocol,
                  NULL
                  );

  ///
  /// Locate DTS platform policy.
  ///
  Status = gBS->LocateProtocol (
                  &gDxeCpuPlatformPolicyProtocolGuid,
                  NULL,
                  (VOID **) &mPlatformCpu
                  );
  if (EFI_ERROR (Status)) {
    DEBUG ((EFI_D_ERROR, "No DTS Platform Policy Protocol available"));
  }

  ASSERT_EFI_ERROR (Status);

  ///
  /// Check if DTS disabled in setup.
  ///
  if (mPlatformCpu->CpuConfig->EnableDts == CPU_FEATURE_DISABLE) {
    DEBUG ((EFI_D_WARN, "DTS not enabled/supported, so driver not loaded into SMM\n"));
    return EFI_SUCCESS;
  }
  ///
  /// Find the SMM base protocol
  ///
  Status = gBS->LocateProtocol (&gEfiSmmBaseProtocolGuid, NULL, (VOID **) &mSmmBase);
  ASSERT_EFI_ERROR (Status);

  ///
  /// Initialize global variables.
  ///
  Status = mSmmBase->GetSmstLocation (mSmmBase, &mSmst);
  ASSERT_EFI_ERROR (Status);
  ///
  /// Verify the code supports the number of processors present.
  ///
  ASSERT (mSmst->NumberOfCpus <= MAX_NUMBER_OF_THREADS_SUPPORTED);

  ///
  /// Get the ACPI Base Address
  ///
  mAcpiBaseAddr = MmioRead16 (MmPciExpressAddress (0, PCI_DEVICE_NUMBER_PCH_LPC, 0, R_PCH_LPC_ACPI_BASE)) &~BIT0;

  ///
  /// Initialize DTS setup value
  ///
  DTSSetupValue = mPlatformCpu->CpuConfig->EnableDts;

  ///
  /// Locate our shared data area
  ///
  Status = gBS->LocateProtocol (&mEfiGlobalNvsAreaProtocolGuid, NULL, (VOID **) &GlobalNvsAreaProtocol);
  ASSERT_EFI_ERROR (Status);
  mGlobalNvsAreaPtr = GlobalNvsAreaProtocol->Area;
  ///
  /// CPU_ID 6, EAX bit 6 for the Package temperature MSR support
  ///
  ZeroMem (&Cpuid06, sizeof (Cpuid06));
  AsmCpuid (6, &Cpuid06.RegEax, &Cpuid06.RegEbx, &Cpuid06.RegEcx, &Cpuid06.RegEdx);

  gIsPackageTempMsrAvailable                    = (BOOLEAN) ((Cpuid06.RegEax >> 6) & 0x01);
  mGlobalNvsAreaPtr->IsPackageTempMSRAvailable  = gIsPackageTempMsrAvailable;
  ///
  /// Locate Platform specific data area, or prepare platform services
  ///
  InitializeDtsHookLib ();

  ///
  /// Initialize ASL manipulation library
  ///
  InitializeAslUpdateLib ();

  ///
  /// Locate the PCH Trap dispatch protocol
  ///
  Status = gBS->LocateProtocol (&mEfiSmmIoTrapDispatchProtocolGuid, NULL, (VOID **) &PchIoTrap);
  ASSERT_EFI_ERROR (Status);

  PchIoTrapContext.Type         = ReadWriteTrap;
  PchIoTrapContext.Length       = 4;
  PchIoTrapContext.Address      = 0;
  PchIoTrapContext.Context      = NULL;
  PchIoTrapContext.MergeDisable = FALSE;
  Status = PchIoTrap->Register (
                  PchIoTrap,
                  DtsIoTrapCallback,
                  &PchIoTrapContext,
                  &PchIoTrapHandle
                  );
  ASSERT_EFI_ERROR (Status);

  ///
  /// Update two ASL items.
  /// 1: Operating Region for DTS IO Trap.
  /// 2: Resource Consumption in LPC Device.
  ///
  ASSERT (PchIoTrapContext.Length <= (UINT8) (-1));
  Status = UpdateAslCode (
                  (EFI_SIGNATURE_32 ('I', 'O', '_', 'D')),
                  PchIoTrapContext.Address,
                  (UINT8) PchIoTrapContext.Length
                  );
  ASSERT_EFI_ERROR (Status);

  ///
  /// Register a callback function to handle Digital Thermal Sensor SMIs.
  ///
  if (mPlatformCpu->CpuConfig->EnableDts != DTS_OUT_OF_SPEC_ONLY) {
    Status = mSmmBase->RegisterCallback (mSmmBase, ImageHandle, DtsSmiCallback, FALSE, FALSE);
    ASSERT_EFI_ERROR (Status);
  } else {
    Status = mSmmBase->RegisterCallback (mSmmBase, ImageHandle, DtsOutOfSpecSmiCallback, FALSE, FALSE);
    ASSERT_EFI_ERROR (Status);
  }
  ///
  /// Locate the Sx Dispatch Protocol
  ///
  Status = gBS->LocateProtocol (
                  &gEfiSmmSxDispatchProtocolGuid,
                  NULL,
                  (VOID **) &SxDispatchProtocol
                  );
  ASSERT_EFI_ERROR (Status);

  ///
  /// Register the callback for S3 entry
  ///
  SxDispatchContext.Type  = SxS3;
  SxDispatchContext.Phase = SxEntry;
  Status = SxDispatchProtocol->Register (
                  SxDispatchProtocol,
                  DtsS3EntryCallBack,
                  &SxDispatchContext,
                  &SxDispatchHandle
                  );
  ASSERT_EFI_ERROR (Status);

  if (mPlatformCpu->CpuConfig->EnableDts != DTS_OUT_OF_SPEC_ONLY) {
    ///
    /// Get the TCC Activation Temperature and use it for TjMax.
    ///
    MsrData.Qword         = AsmReadMsr64 (EFI_MSR_IA32_TEMPERATURE_TARGET);

    mDtsTjMax             = (MsrData.Bytes.ThirdByte);
    mDtsThresholdTable    = mDigitalThermalSensorThresholdTable;
    mNoOfThresholdRanges  = DTS_NUMBER_THRESHOLD_RANGES;
  }

  if (gIsPackageTempMsrAvailable) {
    ///
    /// Enable the DTS on package.
    ///
    PackageDigitalThermalSensorEnable (NULL);
  } else {
    ///
    /// Enable the DTS on all logical processors.
    ///
    RunOnAllLogicalProcessors (DigitalThermalSensorEnable, NULL);
  }
  ///
  /// Initialize Digital Thermal Sensor Function in POST
  ///
  DigitalThermalSensorInit ();

  mDtsInitStatusProtocol.IsDtsInitComplete = TRUE;

  return EFI_SUCCESS;
}