The PlatformPeim() in the PlatformPeiLib is invoked
by the PrePiMain() and provides the platform an
opportunity to setup the plaform specific HOBs.

This PlatfromPeiLib initialises the Kvmtool platform
HOBs like the Fdt, 16550BaseAddress, etc.

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Ard Biesheuvel <Ard.Biesheuvel@arm.com>
---

Notes:
    v5:
     - Fixed minor ECC reported issues in file header.           [Sami]
       Ref: https://edk2.groups.io/g/devel/message/62143
    
    v4:
      - No code change, resending patch with v4 series.          [Sami]
        Ref: https://edk2.groups.io/g/devel/message/61722

 ArmVirtPkg/Library/KvmtoolPlatformPeiLib/KvmtoolPlatformPeiLib.c   | 79 ++++++++++++++++++++
 ArmVirtPkg/Library/KvmtoolPlatformPeiLib/KvmtoolPlatformPeiLib.inf | 49 ++++++++++++
 2 files changed, 128 insertions(+)

diff --git a/ArmVirtPkg/Library/KvmtoolPlatformPeiLib/KvmtoolPlatformPeiLib.c b/ArmVirtPkg/Library/KvmtoolPlatformPeiLib/KvmtoolPlatformPeiLib.c
new file mode 100644
index 0000000000000000000000000000000000000000..255eb0599e4ad73874282eef8422e0b0d8eab2ac
--- /dev/null
+++ b/ArmVirtPkg/Library/KvmtoolPlatformPeiLib/KvmtoolPlatformPeiLib.c
@@ -0,0 +1,79 @@
+/** @file
+  Kvmtool platform PEI library.
+
+  Copyright (c) 2020, ARM Limited. All rights reserved.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiPei.h>
+
+#include <Guid/Early16550UartBaseAddress.h>
+#include <Guid/FdtHob.h>
+
+#include <Library/MemoryAllocationLib.h>
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/PcdLib.h>
+#include <Library/PeiServicesLib.h>
+#include <libfdt.h>
+
+/** Initialise Platform HOBs
+
+  @retval EFI_SUCCESS             Success.
+  @retval EFI_INVALID_PARAMETER   A parameter is invalid.
+  @retval EFI_OUT_OF_RESOURCES    Out of resources.
+**/
+EFI_STATUS
+EFIAPI
+PlatformPeim (
+  VOID
+  )
+{
+  VOID    *Base;
+  VOID    *NewBase;
+  UINTN   FdtSize;
+  UINTN   FdtPages;
+  UINT64  *FdtHobData;
+  UINT64  *UartHobData;
+
+  Base = (VOID*)(UINTN)PcdGet64 (PcdDeviceTreeInitialBaseAddress);
+  if ((Base == NULL) || (fdt_check_header (Base) != 0)) {
+    ASSERT (0);
+    return EFI_INVALID_PARAMETER;
+  }
+
+  FdtSize = fdt_totalsize (Base) + PcdGet32 (PcdDeviceTreeAllocationPadding);
+  FdtPages = EFI_SIZE_TO_PAGES (FdtSize);
+  NewBase = AllocatePages (FdtPages);
+  if (NewBase == NULL) {
+    ASSERT (0);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  fdt_open_into (Base, NewBase, EFI_PAGES_TO_SIZE (FdtPages));
+
+  FdtHobData = BuildGuidHob (&gFdtHobGuid, sizeof (*FdtHobData));
+  if (FdtHobData == NULL) {
+    ASSERT (0);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  *FdtHobData = (UINTN)NewBase;
+
+  UartHobData = BuildGuidHob (
+                  &gEarly16550UartBaseAddressGuid,
+                  sizeof (*UartHobData)
+                  );
+  if (UartHobData == NULL) {
+    ASSERT (0);
+    return EFI_OUT_OF_RESOURCES;
+  }
+
+  *UartHobData = PcdGet64 (PcdSerialRegisterBase);
+
+  BuildFvHob (PcdGet64 (PcdFvBaseAddress), PcdGet32 (PcdFvSize));
+
+  return EFI_SUCCESS;
+}
diff --git a/ArmVirtPkg/Library/KvmtoolPlatformPeiLib/KvmtoolPlatformPeiLib.inf b/ArmVirtPkg/Library/KvmtoolPlatformPeiLib/KvmtoolPlatformPeiLib.inf
new file mode 100644
index 0000000000000000000000000000000000000000..f201aee50cdd07f9424c620152e240ef50715f88
--- /dev/null
+++ b/ArmVirtPkg/Library/KvmtoolPlatformPeiLib/KvmtoolPlatformPeiLib.inf
@@ -0,0 +1,49 @@
+## @file
+#  Kvmtool platform PEI library.
+#
+#  Copyright (c) 2020, ARM Limited. All rights reserved.
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x0001001B
+  BASE_NAME                      = PlatformPeiLib
+  FILE_GUID                      = 21073FB3-BA6F-43EB-83F0-4A840C648165
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = KvmtoolPlatformPeiLib
+
+[Sources]
+  KvmtoolPlatformPeiLib.c
+
+[Packages]
+  ArmPkg/ArmPkg.dec
+  ArmVirtPkg/ArmVirtPkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  DebugLib
+  HobLib
+  FdtLib
+  PcdLib
+  PeiServicesLib
+
+[FixedPcd]
+  gArmTokenSpaceGuid.PcdFvSize
+  gArmVirtTokenSpaceGuid.PcdDeviceTreeAllocationPadding
+
+[Pcd]
+  gArmTokenSpaceGuid.PcdFvBaseAddress
+  gArmVirtTokenSpaceGuid.PcdDeviceTreeInitialBaseAddress
+  gEfiMdeModulePkgTokenSpaceGuid.PcdSerialRegisterBase
+
+[Guids]
+  gFdtHobGuid
+  gEarly16550UartBaseAddressGuid
+
+[Depex]
+  gEfiPeiMemoryDiscoveredPpiGuid
-- 
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'



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