From d97f5304139bc55d3f72b830606bca5cd217512e Mon Sep 17 00:00:00 2001
From: Ceping Sun <cepingx.sun@intel.com>
Date: Sun, 5 Jan 2025 20:33:59 -0500
Subject: [PATCH] UefiCpuPkg: Add NULL TdxMeasurementLib instance

Add NULL instance of TdxMeasurementLib.

Cc: Ray Ni <ray.ni@intel.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
Signed-off-by: Ceping Sun <cepingx.sun@intel.com>
---
 .../TdxMeasurementLibNull.c                   | 85 +++++++++++++++++++
 .../TdxMeasurementLibNull.inf                 | 32 +++++++
 UefiCpuPkg/UefiCpuPkg.dsc                     |  2 +
 3 files changed, 119 insertions(+)
 create mode 100644 UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.c
 create mode 100644 UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.inf

diff --git a/UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.c b/UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.c
new file mode 100644
index 0000000000..1a2955700f
--- /dev/null
+++ b/UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.c
@@ -0,0 +1,85 @@
+/** @file
+  NULL instance of TdxMeasurementLib
+  Copyright (c) 2025, Intel Corporation. All rights reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#include <Base.h>
+#include <PiPei.h>
+#include <Library/TdxMeasurementLib.h>
+
+/**
+  According to UEFI Spec 2.10 Section 38.4.1:
+    The following table shows the TPM PCR index mapping and CC event log measurement
+  register index interpretation for Intel TDX, where MRTD means Trust Domain Measurement
+   Register and RTMR means Runtime Measurement Register
+    // TPM PCR Index | CC Measurement Register Index | TDX-measurement register
+    //  ------------------------------------------------------------------------
+    // 0             |   0                           |   MRTD
+    // 1, 7          |   1                           |   RTMR[0]
+    // 2~6           |   2                           |   RTMR[1]
+    // 8~15          |   3                           |   RTMR[2]
+  @param[in] PCRIndex Index of the TPM PCR
+  @retval    UINT32               Index of the CC Event Log Measurement Register Index
+  @retval    CC_MR_INDEX_INVALID  Invalid MR Index
+**/
+UINT32
+EFIAPI
+TdxMeasurementMapPcrToMrIndex (
+  IN  UINT32  PCRIndex
+  )
+{
+  return CC_MR_INDEX_INVALID;
+}
+
+/**
+ * Calculate the sha384 of input Data and extend it to RTMR register.
+ *
+ * @param RtmrIndex       Index of the RTMR register
+ * @param DataToHash      Data to be hashed
+ * @param DataToHashLen   Length of the data
+ * @param Digest          Hash value of the input data
+ * @param DigestLen       Length of the hash value
+ *
+ * @retval EFI_SUCCESS    Successfully hash and extend to RTMR
+ * @retval Others         Other errors as indicated
+ */
+EFI_STATUS
+EFIAPI
+TdxMeasurementHashAndExtendToRtmr (
+  IN UINT32  RtmrIndex,
+  IN VOID    *DataToHash,
+  IN UINTN   DataToHashLen,
+  OUT UINT8  *Digest,
+  IN  UINTN  DigestLen
+  )
+{
+  return EFI_UNSUPPORTED;
+}
+
+/**
+ * Build GuidHob for Tdx CC measurement event.
+ *
+ * @param RtmrIndex     RTMR index
+ * @param EventType     Event type
+ * @param EventData     Event data
+ * @param EventSize     Size of event data
+ * @param HashValue     Hash value
+ * @param HashSize      Size of hash
+ *
+ * @retval EFI_SUCCESS  Successfully build the GuidHobs
+ * @retval Others       Other error as indicated
+ */
+EFI_STATUS
+EFIAPI
+TdxMeasurementBuildGuidHob (
+  UINT32  RtmrIndex,
+  UINT32  EventType,
+  UINT8   *EventData,
+  UINT32  EventSize,
+  UINT8   *HashValue,
+  UINT32  HashSize
+  )
+{
+  return EFI_UNSUPPORTED;
+}
diff --git a/UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.inf b/UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.inf
new file mode 100644
index 0000000000..c42eebcca3
--- /dev/null
+++ b/UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.inf
@@ -0,0 +1,32 @@
+## @file
+#  TdxMeasurementLib NULL instance
+#
+#  Copyright (c) 2025, Intel Corporation. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = TdxMeasurementNullLib
+  FILE_GUID                      = 975d11ff-b11e-4cf4-b453-6d93a9ea8d7b
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = TdxMeasurementLib
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = X64
+#
+
+[Sources]
+  TdxMeasurementLibNull.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  UefiCpuPkg/UefiCpuPkg.dec
+
+[LibraryClasses]
+  BaseLib
diff --git a/UefiCpuPkg/UefiCpuPkg.dsc b/UefiCpuPkg/UefiCpuPkg.dsc
index 982e024b4e..ec2b6cc722 100644
--- a/UefiCpuPkg/UefiCpuPkg.dsc
+++ b/UefiCpuPkg/UefiCpuPkg.dsc
@@ -62,6 +62,7 @@
   PeCoffExtraActionLib|MdePkg/Library/BasePeCoffExtraActionLibNull/BasePeCoffExtraActionLibNull.inf
   TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
   CcExitLib|UefiCpuPkg/Library/CcExitLibNull/CcExitLibNull.inf
+  TdxMeasurementLib|UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.inf
   AmdSvsmLib|UefiCpuPkg/Library/AmdSvsmLibNull/AmdSvsmLibNull.inf
   MicrocodeLib|UefiCpuPkg/Library/MicrocodeLib/MicrocodeLib.inf
   SmmCpuRendezvousLib|UefiCpuPkg/Library/SmmCpuRendezvousLib/SmmCpuRendezvousLib.inf
@@ -171,6 +172,7 @@
   UefiCpuPkg/Library/SmmCpuFeaturesLib/StandaloneMmCpuFeaturesLib.inf
   UefiCpuPkg/Library/SmmCpuSyncLib/SmmCpuSyncLib.inf
   UefiCpuPkg/Library/CcExitLibNull/CcExitLibNull.inf
+  UefiCpuPkg/Library/TdxMeasurementLibNull/TdxMeasurementLibNull.inf
   UefiCpuPkg/Library/AmdSvsmLibNull/AmdSvsmLibNull.inf
   UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationPei.inf
   UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationSmm.inf