SecurityPkg: Tpm2DeviceLibDTpm: Introduce StandaloneMm instance

This change added a new instance of Tpm2DeviceLibDTpm to support drivers
of type MM_STANDALONE. It abstracts dynamic Pcd access into separate file
for different instances to avoid dynamic usage for StandaloneMm modules.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Qi Zhang <qi1.zhang@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>

Signed-off-by: Kun Qin <kun.q@outlook.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>

SecurityPkg/Library/Tpm2DeviceLibDTpm/Tpm2DeviceLibDTpmStandaloneMm.c

@@ -0,0 +1,66 @@
+/** @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 "Tpm2DeviceLibDTpm.h"
+
+TPM2_PTP_INTERFACE_TYPE  mActiveTpmInterfaceType;
+UINT8                    mCRBIdleByPass;
+
+/**
+  Return cached PTP CRB interface IdleByPass state.
+
+  @return Cached PTP CRB interface IdleByPass state.
+**/
+UINT8
+GetCachedIdleByPass (
+  VOID
+  )
+{
+  return mCRBIdleByPass;
+}
+
+/**
+  Return cached PTP interface type.
+
+  @return Cached PTP interface type.
+**/
+TPM2_PTP_INTERFACE_TYPE
+GetCachedPtpInterface (
+  VOID
+  )
+{
+  return mActiveTpmInterfaceType;
+}
+
+/**
+  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
+  )
+{
+  mActiveTpmInterfaceType = 0xFF;
+  mCRBIdleByPass = 0xFF;
+
+  //
+  // Always cache current active TpmInterfaceType for StandaloneMm implementation
+  //
+  mActiveTpmInterfaceType = Tpm2GetPtpInterface ((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
+
+  if (mActiveTpmInterfaceType == Tpm2PtpInterfaceCrb) {
+    mCRBIdleByPass = Tpm2GetIdleByPass((VOID *) (UINTN) PcdGet64 (PcdTpmBaseAddress));
+  }
+
+  return EFI_SUCCESS;
+}