UefiCpuPkg/Library/CpuCommonFeaturesLib/Ppin.c

/** @file
  Protected Processor Inventory Number(PPIN) feature.

  Copyright (c) 2017 - 2018, Intel Corporation. All rights reserved.<BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "CpuCommonFeatures.h"

/**
  Detects if Protected Processor Inventory Number feature supported on current
  processor.

  @param[in]  ProcessorNumber  The index of the CPU executing this function.
  @param[in]  CpuInfo          A pointer to the REGISTER_CPU_FEATURE_INFORMATION
                               structure for the CPU executing this function.
  @param[in]  ConfigData       A pointer to the configuration buffer returned
                               by CPU_FEATURE_GET_CONFIG_DATA.  NULL if
                               CPU_FEATURE_GET_CONFIG_DATA was not provided in
                               RegisterCpuFeature().

  @retval TRUE     Protected Processor Inventory Number feature is supported.
  @retval FALSE    Protected Processor Inventory Number feature is not supported.

  @note This service could be called by BSP/APs.
**/
BOOLEAN
EFIAPI
PpinSupport (
  IN UINTN                             ProcessorNumber,
  IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  IN VOID                              *ConfigData  OPTIONAL
  )
{
  MSR_IVY_BRIDGE_PLATFORM_INFO_1_REGISTER    PlatformInfo;

  if ((CpuInfo->DisplayFamily == 0x06) &&
      ((CpuInfo->DisplayModel == 0x3E) ||      // Xeon E5 V2
       (CpuInfo->DisplayModel == 0x56) ||      // Xeon Processor D Product
       (CpuInfo->DisplayModel == 0x4F) ||      // Xeon E5 v4, E7 v4
       (CpuInfo->DisplayModel == 0x55) ||      // Xeon Processor Scalable
       (CpuInfo->DisplayModel == 0x57) ||      // Xeon Phi processor 3200, 5200, 7200 series.
       (CpuInfo->DisplayModel == 0x85)         // Future Xeon phi processor
     )) {
    //
    // Check whether platform support this feature.
    //
    PlatformInfo.Uint64 = AsmReadMsr64 (MSR_IVY_BRIDGE_PLATFORM_INFO_1);
    return (PlatformInfo.Bits.PPIN_CAP != 0);
  }

  return FALSE;
}

/**
  Initializes Protected Processor Inventory Number feature to specific state.

  @param[in]  ProcessorNumber  The index of the CPU executing this function.
  @param[in]  CpuInfo          A pointer to the REGISTER_CPU_FEATURE_INFORMATION
                               structure for the CPU executing this function.
  @param[in]  ConfigData       A pointer to the configuration buffer returned
                               by CPU_FEATURE_GET_CONFIG_DATA.  NULL if
                               CPU_FEATURE_GET_CONFIG_DATA was not provided in
                               RegisterCpuFeature().
  @param[in]  State            If TRUE, then the Protected Processor Inventory
                               Number feature must be enabled.
                               If FALSE, then the Protected Processor Inventory
                               Number feature must be disabled.

  @retval RETURN_SUCCESS       Protected Processor Inventory Number feature is
                               initialized.
  @retval RETURN_DEVICE_ERROR  Device can't change state because it has been
                               locked.

**/
RETURN_STATUS
EFIAPI
PpinInitialize (
  IN UINTN                             ProcessorNumber,
  IN REGISTER_CPU_FEATURE_INFORMATION  *CpuInfo,
  IN VOID                              *ConfigData,  OPTIONAL
  IN BOOLEAN                           State
  )
{
  MSR_IVY_BRIDGE_PPIN_CTL_REGISTER     MsrPpinCtrl;

  //
  // Check whether device already lock this register.
  // If already locked, just base on the request state and
  // the current state to return the status.
  //
  MsrPpinCtrl.Uint64 = AsmReadMsr64 (MSR_IVY_BRIDGE_PPIN_CTL);
  if (MsrPpinCtrl.Bits.LockOut != 0) {
    return MsrPpinCtrl.Bits.Enable_PPIN == State ? RETURN_SUCCESS : RETURN_DEVICE_ERROR;
  }

  CPU_REGISTER_TABLE_WRITE_FIELD (
    ProcessorNumber,
    Msr,
    MSR_IVY_BRIDGE_PPIN_CTL,
    MSR_IVY_BRIDGE_PPIN_CTL_REGISTER,
    Bits.Enable_PPIN,
    (State) ? 1 : 0
    );

  return RETURN_SUCCESS;
}