SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2DeviceLibDTpmStandaloneMm.c

   1 /** @file
   2   This file abstract internal interfaces of which implementation differs per library instance.
   3
   4 Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved. <BR>
   5 Copyright (c) Microsoft Corporation.
   6 SPDX-License-Identifier: BSD-2-Clause-Patent
   7
   8 **/
   9
  10 #include <Library/Tpm2DeviceLib.h>
  11
  12 #include "Tpm2DeviceLibDTpm.h"
  13
  14 TPM2_PTP_INTERFACE_TYPE  mActiveTpmInterfaceType;
  15 UINT8                    mCRBIdleByPass;
  16
  17 /**
  18   Return cached PTP CRB interface IdleByPass state.
  19
  20   @return Cached PTP CRB interface IdleByPass state.
  21 **/
  22 UINT8
  23 GetCachedIdleByPass (
  24   VOID
  25   )
  26 {
  27   return mCRBIdleByPass;
  28 }
  29
  30 /**
  31   Return cached PTP interface type.
  32
  33   @return Cached PTP interface type.
  34 **/
  35 TPM2_PTP_INTERFACE_TYPE
  36 GetCachedPtpInterface (
  37   VOID
  38   )
  39 {
  40   return mActiveTpmInterfaceType;
  41 }
  42
  43 /**
  44   The common function cache current active TpmInterfaceType when needed.
  45
  46   @retval EFI_SUCCESS   DTPM2.0 instance is registered, or system does not support register DTPM2.0 instance
  47 **/
  48 EFI_STATUS
  49 InternalTpm2DeviceLibDTpmCommonConstructor (
  50   VOID
  51   )
  52 {
  53   mActiveTpmInterfaceType = 0xFF;
  54   mCRBIdleByPass          = 0xFF;
  55
  56   //
  57   // Always cache current active TpmInterfaceType for StandaloneMm implementation
  58   //
  59   mActiveTpmInterfaceType = Tpm2GetPtpInterface ((VOID *)(UINTN)PcdGet64 (PcdTpmBaseAddress));
  60
  61   if (mActiveTpmInterfaceType == Tpm2PtpInterfaceCrb) {
  62     mCRBIdleByPass = Tpm2GetIdleByPass ((VOID *)(UINTN)PcdGet64 (PcdTpmBaseAddress));
  63   }
  64
  65   return EFI_SUCCESS;
  66 }