1 files changed, 68 insertions, 0 deletions
diff --git a/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2DeviceLibDTpmBase.c b/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2DeviceLibDTpmBase.c
new file mode 100644
index 0000000000..bc35e257e1
--- /dev/null
+++ b/SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2DeviceLibDTpmBase.c
@@ -0,0 +1,68 @@
+/** @file
+  This file abstract internal interfaces of which implementation differs per library instance.
+
+Copyright (c) 2013 - 2018, Intel Corporation. All rights reserved. <BR>
+Copyright (c) Microsoft Corporation.
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/Tpm2DeviceLib.h>
+#include <Library/PcdLib.h>
+
+#include "Tpm2DeviceLibDTpm.h"
+
+/**
+  Return cached PTP CRB interface IdleByPass state.
+
+  @return Cached PTP CRB interface IdleByPass state.
+**/
+UINT8
+GetCachedIdleByPass (
+  VOID
+  )
+{
+  return PcdGet8(PcdCRBIdleByPass);
+}
+
+/**
+  Return cached PTP interface type.
+
+  @return Cached PTP interface type.
+**/
+TPM2_PTP_INTERFACE_TYPE
+GetCachedPtpInterface (
+  VOID
+  )
+{
+  return PcdGet8(PcdActiveTpmInterfaceType);
+}
+
+/**
+  The common function cache current active TpmInterfaceType when needed.
+
+  @retval EFI_SUCCESS   DTPM2.0 instance is registered, or system does not support register DTPM2.0 instance
+**/
+EFI_STATUS
+InternalTpm2DeviceLibDTpmCommonConstructor (
+  VOID
+  )
+{
+  TPM2_PTP_INTERFACE_TYPE  PtpInterface;
+  UINT8                    IdleByPass;
+
+  //
+  // Cache current active TpmInterfaceType only when needed
+  //
+  if (PcdGet8(PcdActiveTpmInterfaceType) == 0xFF) {
+    PtpInterface = Tpm2GetPtpInterface ((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
+    PcdSet8S(PcdActiveTpmInterfaceType, PtpInterface);
+  }
+
+  if (PcdGet8(PcdActiveTpmInterfaceType) == Tpm2PtpInterfaceCrb && PcdGet8(PcdCRBIdleByPass) == 0xFF) {
+    IdleByPass = Tpm2GetIdleByPass((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
+    PcdSet8S(PcdCRBIdleByPass, IdleByPass);
+  }
+
+  return EFI_SUCCESS;
+}