SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2DeviceLibDTpmBase.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 #include <Library/PcdLib.h>
  12
  13 #include "Tpm2DeviceLibDTpm.h"
  14
  15 /**
  16   Return cached PTP CRB interface IdleByPass state.
  17
  18   @return Cached PTP CRB interface IdleByPass state.
  19 **/
  20 UINT8
  21 GetCachedIdleByPass (
  22   VOID
  23   )
  24 {
  25   return PcdGet8 (PcdCRBIdleByPass);
  26 }
  27
  28 /**
  29   Return cached PTP interface type.
  30
  31   @return Cached PTP interface type.
  32 **/
  33 TPM2_PTP_INTERFACE_TYPE
  34 GetCachedPtpInterface (
  35   VOID
  36   )
  37 {
  38   return PcdGet8 (PcdActiveTpmInterfaceType);
  39 }
  40
  41 /**
  42   The common function cache current active TpmInterfaceType when needed.
  43
  44   @retval EFI_SUCCESS   DTPM2.0 instance is registered, or system does not support register DTPM2.0 instance
  45 **/
  46 EFI_STATUS
  47 InternalTpm2DeviceLibDTpmCommonConstructor (
  48   VOID
  49   )
  50 {
  51   TPM2_PTP_INTERFACE_TYPE  PtpInterface;
  52   UINT8                    IdleByPass;
  53
  54   //
  55   // Cache current active TpmInterfaceType only when needed
  56   //
  57   if (PcdGet8 (PcdActiveTpmInterfaceType) == 0xFF) {
  58     PtpInterface = Tpm2GetPtpInterface ((VOID *)(UINTN)PcdGet64 (PcdTpmBaseAddress));
  59     PcdSet8S (PcdActiveTpmInterfaceType, PtpInterface);
  60   }
  61
  62   if ((PcdGet8 (PcdActiveTpmInterfaceType) == Tpm2PtpInterfaceCrb) && (PcdGet8 (PcdCRBIdleByPass) == 0xFF)) {
  63     IdleByPass = Tpm2GetIdleByPass ((VOID *)(UINTN)PcdGet64 (PcdTpmBaseAddress));
  64     PcdSet8S (PcdCRBIdleByPass, IdleByPass);
  65   }
  66
  67   return EFI_SUCCESS;
  68 }