OvmfPkg/RiscVVirt: Add SEC module

Add the SEC module for RISC-V Qemu virt machine support.
It uses the PEI less design.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
Acked-by: Abner Chang <abner.chang@amd.com>
Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>
Acked-by: Jiewen Yao <Jiewen.yao@intel.com>
Acked-by: Ard Biesheuvel <ardb@kernel.org>

OvmfPkg/RiscVVirt/Sec/Platform.c

@@ -0,0 +1,84 @@
+/** @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>
+
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+//
+//// The package level header files this module uses
+////
+#include <PiPei.h>
+
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+#include <Library/PcdLib.h>
+#include <Include/Library/PrePiLib.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
+PlatformPeimInitialization (
+  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;
+  if (fdt_check_header (Base) != 0) {
+    DEBUG ((DEBUG_ERROR, "%a: Corrupted DTB\n", __FUNCTION__));
+    return EFI_UNSUPPORTED;
+  }
+
+  FdtSize  = fdt_totalsize (Base);
+  FdtPages = EFI_SIZE_TO_PAGES (FdtSize);
+  NewBase  = AllocatePages (FdtPages);
+  if (NewBase == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a: Could not allocate memory for DTB\n", __FUNCTION__));
+    return EFI_UNSUPPORTED;
+  }
+
+  fdt_open_into (Base, NewBase, EFI_PAGES_TO_SIZE (FdtPages));
+
+  FdtHobData = BuildGuidHob (&gFdtHobGuid, sizeof *FdtHobData);
+  if (FdtHobData == NULL) {
+    DEBUG ((DEBUG_ERROR, "%a: Could not build FDT Hob\n", __FUNCTION__));
+    return EFI_UNSUPPORTED;
+  }
+
+  *FdtHobData = (UINTN)NewBase;
+
+  BuildFvHob (PcdGet32 (PcdOvmfDxeMemFvBase), PcdGet32 (PcdOvmfDxeMemFvSize));
+
+  return EFI_SUCCESS;
+}