[PATCH 04/10] OvmfPkg: Add PrePiHobListPointerLibTdx

["Min Xu" <min.m.xu@intel.com>]

RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429

This library is needed by EmbeddedPkg/PrePiHobLib to set / get the
Hob list pointer.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
---
 .../PrePiHobListPointer.c                     | 45 +++++++++++++++++++
 .../PrePiHobListPointerLibTdx.inf             | 25 +++++++++++
 2 files changed, 70 insertions(+)
 create mode 100644 OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c
 create mode 100644 OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointerLibTdx.inf

diff --git a/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c b/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c
new file mode 100644
index 000000000000..a64ca5f04fc5
--- /dev/null
+++ b/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointer.c
@@ -0,0 +1,45 @@
+/** @file
+*
+*  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+*  SPDX-License-Identifier: BSD-2-Clause-Patent
+*
+**/
+
+#include <PiPei.h>
+#include <Library/PrePiHobListPointerLib.h>
+#include <Library/DebugLib.h>
+
+static VOID  *mHobList = NULL;
+
+/**
+  Returns the pointer to the HOB list.
+
+  This function returns the pointer to first HOB in the list.
+
+  @return The pointer to the HOB list.
+
+**/
+VOID *
+EFIAPI
+PrePeiGetHobList (
+  VOID
+  )
+{
+  return mHobList;
+}
+
+/**
+  Updates the pointer to the HOB list.
+
+  @param  HobList       Hob list pointer to store
+
+**/
+EFI_STATUS
+EFIAPI
+PrePeiSetHobList (
+  IN  VOID  *HobList
+  )
+{
+  mHobList = HobList;
+  return EFI_SUCCESS;
+}
diff --git a/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointerLibTdx.inf b/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointerLibTdx.inf
new file mode 100644
index 000000000000..4d50d28a1614
--- /dev/null
+++ b/OvmfPkg/IntelTdx/PrePiHobListPointerLibTdx/PrePiHobListPointerLibTdx.inf
@@ -0,0 +1,25 @@
+#/** @file
+#
+#  Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = PrePiHobListPointerLibTdx
+  FILE_GUID                      = 28297DB9-4CE7-4679-80E6-0270B215A2F2
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PrePiHobListPointerLib
+
+[Sources]
+  PrePiHobListPointer.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  OvmfPkg/OvmfPkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+
+[LibraryClasses]
+  PcdLib
-- 
2.29.2.windows.2