[RFC PATCH 13/17] MdePkg: Add PlatformPeiLib library

["Sunil V L" <sunilvl@ventanamicro.com>]

This library is required in RISC-V to build the FDT Hob. The
library can be leveraged by other architectures like ARM if
required.

Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
---
 MdePkg/Include/Library/PlatformPeiLib.h       | 15 ++++
 .../Library/PlatformPeiLib/PlatformPeiLib.inf | 40 +++++++++++
 .../PlatformPeiLib/RiscV64/PlatformPeiLib.c   | 68 +++++++++++++++++++
 3 files changed, 123 insertions(+)
 create mode 100644 MdePkg/Include/Library/PlatformPeiLib.h
 create mode 100644 MdePkg/Library/PlatformPeiLib/PlatformPeiLib.inf
 create mode 100644 MdePkg/Library/PlatformPeiLib/RiscV64/PlatformPeiLib.c

diff --git a/MdePkg/Include/Library/PlatformPeiLib.h b/MdePkg/Include/Library/PlatformPeiLib.h
new file mode 100644
index 0000000000..1e8c5f98cf
--- /dev/null
+++ b/MdePkg/Include/Library/PlatformPeiLib.h
@@ -0,0 +1,15 @@
+/** @file
+  Library to initialize platform data at PEI phase
+
+  Copyright (c) 2021-2022, Hewlett Packard Development LP. All rights reserved.<BR>
+  Copyright (c) 2022, Ventana Micro Systems Inc. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+**/
+
+#ifndef _PLATFORM_PEI_LIB_H_
+#define _PLATFORM_PEI_LIB_H_
+
+EFI_STATUS PlatformPeim(VOID);
+
+#endif
diff --git a/MdePkg/Library/PlatformPeiLib/PlatformPeiLib.inf b/MdePkg/Library/PlatformPeiLib/PlatformPeiLib.inf
new file mode 100644
index 0000000000..d682b3c0f9
--- /dev/null
+++ b/MdePkg/Library/PlatformPeiLib/PlatformPeiLib.inf
@@ -0,0 +1,40 @@
+## @file
+#  Platform Initialization Pei Library
+#
+#  Copyright (c) 2020, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+#  Copyright (c) 2022, Ventana Micro Systems Inc. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION    = 0x0001001b
+  BASE_NAME      = PlatformPeiLib
+  FILE_GUID      = B35BD738-787B-47FB-8139-20193442CC49
+  MODULE_TYPE    = PEIM
+  VERSION_STRING = 1.0
+  LIBRARY_CLASS  = PlatformPeiLib
+
+[Sources.RISCV64]
+  RiscV64/PlatformPeiLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  UefiCpuPkg/UefiCpuPkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+
+[LibraryClasses]
+  DebugLib
+  HobLib
+  FdtLib
+  PcdLib
+  PeimEntryPoint
+  BaseLib
+
+[LibraryClasses.RISCV64]
+  RiscVSbiLib
+
+[Guids]
+  gFdtHobGuid   ## PRODUCES
diff --git a/MdePkg/Library/PlatformPeiLib/RiscV64/PlatformPeiLib.c b/MdePkg/Library/PlatformPeiLib/RiscV64/PlatformPeiLib.c
new file mode 100644
index 0000000000..e62aa26df9
--- /dev/null
+++ b/MdePkg/Library/PlatformPeiLib/RiscV64/PlatformPeiLib.c
@@ -0,0 +1,68 @@
+/** @file
+The library call to pass the device tree to DXE via HOB.
+
+Copyright (c) 2021, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+Copyright (c) 2022, Ventana Micro Systems Inc. All rights reserved.<BR>
+
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/RiscVSbiLib.h>
+
+#include <libfdt.h>
+
+#include <Guid/FdtHob.h>
+
+/**
+  @retval EFI_SUCCESS            The address of FDT is passed in HOB.
+          EFI_UNSUPPORTED        Can't locate FDT.
+**/
+EFI_STATUS
+EFIAPI
+PlatformPeim (
+  VOID
+  )
+{
+  EFI_RISCV_FIRMWARE_CONTEXT *FirmwareContext;
+  VOID                       *FdtPointer;
+  VOID                       *Base;
+  VOID                       *NewBase;
+  UINTN                      FdtSize;
+  UINTN                      FdtPages;
+  UINT64                     *FdtHobData;
+
+  FirmwareContext = NULL;
+  GetFirmwareContextPointer (&FirmwareContext);
+
+  if (FirmwareContext == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a: Firmware Context is NULL\n", __FUNCTION__));
+    return EFI_UNSUPPORTED;
+  }
+
+  FdtPointer = (VOID *)FirmwareContext->FlattenedDeviceTree;
+  if (FdtPointer == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a: Invalid FDT pointer\n", __FUNCTION__));
+    return EFI_UNSUPPORTED;
+  }
+
+  DEBUG ((DEBUG_INFO, "%a: Build FDT HOB - FDT at address: 0x%x \n", __FUNCTION__, FdtPointer));
+  Base = FdtPointer;
+  ASSERT (Base != NULL);
+  ASSERT (fdt_check_header (Base) == 0);
+
+  FdtSize  = fdt_totalsize (Base);
+  FdtPages = EFI_SIZE_TO_PAGES (FdtSize);
+  NewBase  = AllocatePages (FdtPages);
+  ASSERT (NewBase != NULL);
+  fdt_open_into (Base, NewBase, EFI_PAGES_TO_SIZE (FdtPages));
+
+  FdtHobData = BuildGuidHob (&gFdtHobGuid, sizeof *FdtHobData);
+  ASSERT (FdtHobData != NULL);
+  *FdtHobData = (UINTN)NewBase;
+
+  return EFI_SUCCESS;
+}
-- 
2.25.1