+/** @file\r
+ NULL instance of TdxHelperLib\r
+\r
+ Copyright (c) 2022 - 2023, Intel Corporation. All rights reserved.<BR>\r
+\r
+ SPDX-License-Identifier: BSD-2-Clause-Patent\r
+\r
+**/\r
+\r
+#include <Base.h>\r
+#include <PiPei.h>\r
+\r
+/**\r
+ In Tdx guest, some information need to be passed from host VMM to guest\r
+ firmware. For example, the memory resource, etc. These information are\r
+ prepared by host VMM and put in TdHob which is described in TdxMetadata.\r
+ TDVF processes the TdHob to accept memories.\r
+\r
+ @retval EFI_SUCCESS Successfully process the TdHob\r
+ @retval Others Other error as indicated\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+TdxHelperProcessTdHob (\r
+ VOID\r
+ )\r
+{\r
+ return EFI_UNSUPPORTED;\r
+}\r
+\r
+/**\r
+ In Tdx guest, TdHob is passed from host VMM to guest firmware and it contains\r
+ the information of the memory resource. From the security perspective before\r
+ it is consumed, it should be measured and extended.\r
+ *\r
+ * @retval EFI_SUCCESS Successfully measure the TdHob\r
+ * @retval Others Other error as indicated\r
+ */\r
+EFI_STATUS\r
+EFIAPI\r
+TdxHelperMeasureTdHob (\r
+ VOID\r
+ )\r
+{\r
+ return EFI_UNSUPPORTED;\r
+}\r
+\r
+/**\r
+ * In Tdx guest, Configuration FV (CFV) is treated as external input because it\r
+ * may contain the data provided by VMM. From the sucurity perspective Cfv image\r
+ * should be measured before it is consumed.\r
+ *\r
+ * @retval EFI_SUCCESS Successfully measure the CFV image\r
+ * @retval Others Other error as indicated\r
+ */\r
+EFI_STATUS\r
+EFIAPI\r
+TdxHelperMeasureCfvImage (\r
+ VOID\r
+ )\r
+{\r
+ return EFI_UNSUPPORTED;\r
+}\r
+\r
+/**\r
+ Build the GuidHob for tdx measurements which were done in SEC phase.\r
+ The measurement values are stored in WorkArea.\r
+\r
+ @retval EFI_SUCCESS The GuidHob is built successfully\r
+ @retval Others Other errors as indicated\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+TdxHelperBuildGuidHobForTdxMeasurement (\r
+ VOID\r
+ )\r
+{\r
+ return EFI_UNSUPPORTED;\r
+}\r