Re: [edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V7 18/20] OvmfPkg/RiscVVirt: Add SEC module

["Andrei Warkentin" <andrei.warkentin@intel.com>]

Reviewed-by: Andrei Warkentin <andrei.warkentin@intel.com>

-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Sunil V L
Sent: Saturday, January 28, 2023 1:18 PM
To: devel@edk2.groups.io
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>; Yao, Jiewen <jiewen.yao@intel.com>; Justen, Jordan L <jordan.l.justen@intel.com>; Gerd Hoffmann <kraxel@redhat.com>; Abner Chang <abner.chang@amd.com>
Subject: [edk2-devel] [edk2-staging/RiscV64QemuVirt PATCH V7 18/20] 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>
---
 OvmfPkg/RiscVVirt/Sec/SecMain.inf |  66 +++++
 OvmfPkg/RiscVVirt/Sec/SecMain.h   | 102 ++++++++
 OvmfPkg/RiscVVirt/Sec/Cpu.c       |  33 +++
 OvmfPkg/RiscVVirt/Sec/Memory.c    | 263 ++++++++++++++++++++
 OvmfPkg/RiscVVirt/Sec/Platform.c  |  84 +++++++
 OvmfPkg/RiscVVirt/Sec/SecMain.c   | 104 ++++++++
 OvmfPkg/RiscVVirt/Sec/SecEntry.S  |  21 ++
 7 files changed, 673 insertions(+)

diff --git a/OvmfPkg/RiscVVirt/Sec/SecMain.inf b/OvmfPkg/RiscVVirt/Sec/SecMain.inf
new file mode 100644
index 000000000000..aed35d3af596
--- /dev/null
+++ b/OvmfPkg/RiscVVirt/Sec/SecMain.inf
@@ -0,0 +1,66 @@
+## @file
+#  SEC Driver for RISC-V
+#
+#  Copyright (c) 2022, Ventana Micro Systems Inc. All rights 
+reserved.<BR> # #  SPDX-License-Identifier: BSD-2-Clause-Patent # ##
+
+[Defines]
+  INF_VERSION                    = 0x0001001B
+  BASE_NAME                      = SecMainRiscV64
+  FILE_GUID                      = 16740C0A-AA84-4F62-A06D-AE328057AE07
+  MODULE_TYPE                    = SEC
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = SecMain
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = RISCV64
+#
+
+[Sources]
+  SecEntry.S
+  SecMain.c
+  SecMain.h
+  Cpu.c
+  Memory.c
+  Platform.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  UefiCpuPkg/UefiCpuPkg.dec
+  OvmfPkg/OvmfPkg.dec
+  EmbeddedPkg/EmbeddedPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib
+  PcdLib
+  IoLib
+  PeCoffLib
+  LzmaDecompressLib
+  RiscVSbiLib
+  PrePiLib
+  FdtLib
+  MemoryAllocationLib
+  HobLib
+
+[Ppis]
+  gEfiTemporaryRamSupportPpiGuid                # PPI ALWAYS_PRODUCED
+  gEfiTemporaryRamDonePpiGuid                   ## PRODUCES
+
+[Pcd]
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvBase
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvBase
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfDxeMemFvSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamBase
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamSize
+  gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFdBaseAddress
+
+[Guids]
+  gFdtHobGuid
diff --git a/OvmfPkg/RiscVVirt/Sec/SecMain.h b/OvmfPkg/RiscVVirt/Sec/SecMain.h new file mode 100644 index 000000000000..83a8058efe40
--- /dev/null
+++ b/OvmfPkg/RiscVVirt/Sec/SecMain.h
@@ -0,0 +1,102 @@
+/** @file
+  Master header file for SecCore.
+
+  Copyright (c) 2022, Ventana Micro Systems Inc. All rights 
+ reserved.<BR>
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#ifndef SEC_MAIN_H_
+#define SEC_MAIN_H_
+
+#include <PiPei.h>
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugAgentLib.h>
+#include <Library/DebugLib.h>
+#include <Library/ExtractGuidedSectionLib.h>
+#include <Library/IoLib.h>
+#include <Library/HobLib.h>
+#include <Library/PcdLib.h>
+#include <Library/PeCoffExtraActionLib.h> #include 
+<Library/PeCoffGetEntryPointLib.h>
+#include <Library/PeCoffLib.h>
+#include <Library/PeiServicesLib.h>
+#include <Library/PeiServicesTablePointerLib.h>
+#include <Library/DebugPrintErrorLevelLib.h>
+#include <Library/PrintLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+#include <Library/PrePiLib.h>
+#include <Library/PlatformInitLib.h>
+#include <Library/PrePiHobListPointerLib.h>
+#include <Register/RiscV64/RiscVImpl.h>
+
+/**
+  Entry point to the C language phase of SEC. After the SEC assembly
+  code has initialized some temporary memory and set up the stack,
+  the control is transferred to this function.
+
+  @param SizeOfRam           Size of the temporary memory available for use.
+  @param TempRamBase         Base address of temporary ram
+  @param BootFirmwareVolume  Base address of the Boot Firmware Volume.
+**/
+VOID
+NORETURN
+EFIAPI
+SecStartup (
+  IN  UINTN  BootHartId,
+  IN  VOID   *DeviceTreeAddress
+  );
+
+/**
+  Auto-generated function that calls the library constructors for all 
+of the module's
+  dependent libraries.  This function must be called by the SEC Core 
+once a stack has
+  been established.
+
+**/
+VOID
+EFIAPI
+ProcessLibraryConstructorList (
+  VOID
+  );
+
+/**
+  Perform Platform PEIM initialization.
+
+  @return EFI_SUCCESS     The platform initialized successfully.
+  @retval  Others        - As the error code indicates
+
+**/
+EFI_STATUS
+EFIAPI
+PlatformPeimInitialization (
+  VOID
+  );
+
+/**
+  Perform Memory PEIM initialization.
+
+  @return EFI_SUCCESS     The platform initialized successfully.
+  @retval  Others        - As the error code indicates
+
+**/
+EFI_STATUS
+EFIAPI
+MemoryPeimInitialization (
+  VOID
+  );
+
+/**
+  Perform CPU PEIM initialization.
+
+  @return EFI_SUCCESS     The platform initialized successfully.
+  @retval  Others        - As the error code indicates
+
+**/
+EFI_STATUS
+EFIAPI
+CpuPeimInitialization (
+  VOID
+  );
+
+#endif
diff --git a/OvmfPkg/RiscVVirt/Sec/Cpu.c b/OvmfPkg/RiscVVirt/Sec/Cpu.c new file mode 100644 index 000000000000..2c16df697e37
--- /dev/null
+++ b/OvmfPkg/RiscVVirt/Sec/Cpu.c
@@ -0,0 +1,33 @@
+/** @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>
+
+/**
+  Cpu Peim initialization.
+
+**/
+EFI_STATUS
+CpuPeimInitialization (
+  VOID
+  )
+{
+  //
+  // for MMU type >= sv39
+  //
+  BuildCpuHob (56, 32);
+
+  return EFI_SUCCESS;
+}
diff --git a/OvmfPkg/RiscVVirt/Sec/Memory.c b/OvmfPkg/RiscVVirt/Sec/Memory.c new file mode 100644 index 000000000000..70935b07b56b
--- /dev/null
+++ b/OvmfPkg/RiscVVirt/Sec/Memory.c
@@ -0,0 +1,263 @@
+/** @file
+  Memory Detection for Virtual Machines.
+
+  Copyright (c) 2021, Hewlett Packard Enterprise Development LP. All 
+ rights reserved.<BR>  Copyright (c) 2006 - 2014, Intel Corporation. 
+ All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+Module Name:
+
+  MemDetect.c
+
+**/
+
+//
+// The package level header files this module uses // #include 
+<PiPei.h>
+
+//
+// The Library classes this module consumes // #include 
+<Library/BaseMemoryLib.h> #include <Library/DebugLib.h> #include 
+<Library/HobLib.h> #include <Library/IoLib.h> #include 
+<Library/PcdLib.h> #include <Library/PeimEntryPoint.h> #include 
+<Library/ResourcePublicationLib.h>
+#include <Library/BaseRiscVSbiLib.h>
+#include <Register/RiscV64/RiscVEncoding.h>
+#include <Library/PrePiLib.h>
+#include <libfdt.h>
+#include <Guid/FdtHob.h>
+
+VOID
+BuildMemoryTypeInformationHob (
+  VOID
+  );
+
+/**
+  Build reserved memory range resource HOB.
+
+  @param  MemoryBase     Reserved memory range base address.
+  @param  MemorySize     Reserved memory range size.
+
+**/
+STATIC
+VOID
+AddReservedMemoryBaseSizeHob (
+  EFI_PHYSICAL_ADDRESS  MemoryBase,
+  UINT64                MemorySize
+  )
+{
+  BuildResourceDescriptorHob (
+    EFI_RESOURCE_MEMORY_RESERVED,
+    EFI_RESOURCE_ATTRIBUTE_PRESENT     |
+    EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
+    EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
+    EFI_RESOURCE_ATTRIBUTE_TESTED,
+    MemoryBase,
+    MemorySize
+    );
+}
+
+/**
+  Create memory range resource HOB using the memory base
+  address and size.
+
+  @param  MemoryBase     Memory range base address.
+  @param  MemorySize     Memory range size.
+
+**/
+STATIC
+VOID
+AddMemoryBaseSizeHob (
+  EFI_PHYSICAL_ADDRESS  MemoryBase,
+  UINT64                MemorySize
+  )
+{
+  BuildResourceDescriptorHob (
+    EFI_RESOURCE_SYSTEM_MEMORY,
+    EFI_RESOURCE_ATTRIBUTE_PRESENT |
+    EFI_RESOURCE_ATTRIBUTE_INITIALIZED |
+    EFI_RESOURCE_ATTRIBUTE_UNCACHEABLE |
+    EFI_RESOURCE_ATTRIBUTE_WRITE_COMBINEABLE |
+    EFI_RESOURCE_ATTRIBUTE_WRITE_THROUGH_CACHEABLE |
+    EFI_RESOURCE_ATTRIBUTE_WRITE_BACK_CACHEABLE |
+    EFI_RESOURCE_ATTRIBUTE_TESTED,
+    MemoryBase,
+    MemorySize
+    );
+}
+
+/**
+  Create memory range resource HOB using memory base
+  address and top address of the memory range.
+
+  @param  MemoryBase     Memory range base address.
+  @param  MemoryLimit    Memory range size.
+
+**/
+STATIC
+VOID
+AddMemoryRangeHob (
+  EFI_PHYSICAL_ADDRESS  MemoryBase,
+  EFI_PHYSICAL_ADDRESS  MemoryLimit
+  )
+{
+  AddMemoryBaseSizeHob (MemoryBase, (UINT64)(MemoryLimit - 
+MemoryBase)); }
+
+/**
+  Configure MMU
+**/
+STATIC
+VOID
+InitMmu (
+  )
+{
+  //
+  // Set supervisor translation mode to Bare mode
+  //
+  RiscVSetSupervisorAddressTranslationRegister ((UINT64)SATP_MODE_OFF 
+<< 60);
+  DEBUG ((DEBUG_INFO, "%a: Set Supervisor address mode to bare-metal 
+mode.\n", __FUNCTION__)); }
+
+/**
+  Publish system RAM and reserve memory regions.
+
+**/
+STATIC
+VOID
+InitializeRamRegions (
+  EFI_PHYSICAL_ADDRESS  SystemMemoryBase,
+  UINT64                SystemMemorySize,
+  EFI_PHYSICAL_ADDRESS  MmodeResvBase,
+  UINT64                MmodeResvSize
+  )
+{
+  /*
+   * M-mode FW can be loaded anywhere in memory but should not overlap
+   * with the EDK2. This can happen if some other boot code loads the
+   * M-mode firmware.
+   *
+   * The M-mode firmware memory should be marked as reserved memory
+   * so that OS doesn't use it.
+   */
+  DEBUG ((
+    DEBUG_INFO,
+    "%a: M-mode FW Memory Start:0x%lx End:0x%lx\n",
+    __FUNCTION__,
+    MmodeResvBase,
+    MmodeResvBase + MmodeResvSize
+    ));
+  AddReservedMemoryBaseSizeHob (MmodeResvBase, MmodeResvSize);
+
+  if (MmodeResvBase > SystemMemoryBase) {
+    AddMemoryRangeHob (SystemMemoryBase, MmodeResvBase);  }
+
+  AddMemoryRangeHob (
+    MmodeResvBase + MmodeResvSize,
+    SystemMemoryBase + SystemMemorySize
+    );
+}
+
+/**
+  Initialize memory hob based on the DTB information.
+
+  @return EFI_SUCCESS     The memory hob added successfully.
+
+**/
+EFI_STATUS
+MemoryPeimInitialization (
+  VOID
+  )
+{
+  EFI_RISCV_FIRMWARE_CONTEXT  *FirmwareContext;
+  CONST UINT64                *RegProp;
+  CONST CHAR8                 *Type;
+  UINT64                      CurBase, CurSize;
+  INT32                       Node, Prev;
+  INT32                       Len;
+  VOID                        *FdtPointer;
+  EFI_PHYSICAL_ADDRESS        MmodeResvBase;
+  UINT64                      MmodeResvSize;
+
+  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;
+  }
+
+  /* try to locate the reserved memory opensbi node */  Node = 
+ fdt_path_offset (FdtPointer, "/reserved-memory/mmode_resv0");  if 
+ (Node >= 0) {
+    RegProp = fdt_getprop (FdtPointer, Node, "reg", &Len);
+    if ((RegProp != 0) && (Len == (2 * sizeof (UINT64)))) {
+      MmodeResvBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
+      MmodeResvSize = fdt64_to_cpu (ReadUnaligned64 (RegProp + 1));
+    }
+  }
+
+  // Look for the lowest memory node
+  for (Prev = 0; ; Prev = Node) {
+    Node = fdt_next_node (FdtPointer, Prev, NULL);
+    if (Node < 0) {
+      break;
+    }
+
+    // Check for memory node
+    Type = fdt_getprop (FdtPointer, Node, "device_type", &Len);
+    if (Type && (AsciiStrnCmp (Type, "memory", Len) == 0)) {
+      // Get the 'reg' property of this node. For now, we will assume
+      // two 8 byte quantities for base and size, respectively.
+      RegProp = fdt_getprop (FdtPointer, Node, "reg", &Len);
+      if ((RegProp != 0) && (Len == (2 * sizeof (UINT64)))) {
+        CurBase = fdt64_to_cpu (ReadUnaligned64 (RegProp));
+        CurSize = fdt64_to_cpu (ReadUnaligned64 (RegProp + 1));
+
+        DEBUG ((
+          DEBUG_INFO,
+          "%a: System RAM @ 0x%lx - 0x%lx\n",
+          __FUNCTION__,
+          CurBase,
+          CurBase + CurSize - 1
+          ));
+
+        if ((MmodeResvBase >= CurBase) && ((MmodeResvBase + MmodeResvSize) <= (CurBase + CurSize))) {
+          InitializeRamRegions (
+            CurBase,
+            CurSize,
+            MmodeResvBase,
+            MmodeResvSize
+            );
+        } else {
+          AddMemoryBaseSizeHob (CurBase, CurSize);
+        }
+      } else {
+        DEBUG ((
+          DEBUG_ERROR,
+          "%a: Failed to parse FDT memory node\n",
+          __FUNCTION__
+          ));
+      }
+    }
+  }
+
+  InitMmu ();
+
+  BuildMemoryTypeInformationHob ();
+
+  return EFI_SUCCESS;
+}
diff --git a/OvmfPkg/RiscVVirt/Sec/Platform.c b/OvmfPkg/RiscVVirt/Sec/Platform.c
new file mode 100644
index 000000000000..e8fd126cf800
--- /dev/null
+++ b/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;
+}
diff --git a/OvmfPkg/RiscVVirt/Sec/SecMain.c b/OvmfPkg/RiscVVirt/Sec/SecMain.c new file mode 100644 index 000000000000..054e49ef0c1e
--- /dev/null
+++ b/OvmfPkg/RiscVVirt/Sec/SecMain.c
@@ -0,0 +1,104 @@
+/** @file
+  RISC-V SEC phase module for Qemu Virt.
+
+  Copyright (c) 2008 - 2015, Intel Corporation. All rights 
+ reserved.<BR>  Copyright (c) 2022, Ventana Micro Systems Inc. All 
+ rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "SecMain.h"
+
+STATIC
+EFI_STATUS
+EFIAPI
+SecInitializePlatform (
+  VOID
+  )
+{
+  EFI_STATUS  Status;
+
+  MemoryPeimInitialization ();
+
+  CpuPeimInitialization ();
+
+  // Set the Boot Mode
+  SetBootMode (BOOT_WITH_FULL_CONFIGURATION);
+
+  Status = PlatformPeimInitialization ();  ASSERT_EFI_ERROR (Status);
+
+  return EFI_SUCCESS;
+}
+
+/**
+
+  Entry point to the C language phase of SEC. After the SEC assembly  
+ code has initialized some temporary memory and set up the stack,  the 
+ control is transferred to this function.
+
+
+  @param[in]  BootHartId         Hardware thread ID of boot hart.
+  @param[in]  DeviceTreeAddress  Pointer to Device Tree (DTB) **/ VOID 
+NORETURN EFIAPI SecStartup (
+  IN  UINTN  BootHartId,
+  IN  VOID   *DeviceTreeAddress
+  )
+{
+  EFI_HOB_HANDOFF_INFO_TABLE  *HobList;
+  EFI_RISCV_FIRMWARE_CONTEXT  FirmwareContext;
+  EFI_STATUS                  Status;
+  UINT64                      UefiMemoryBase;
+  UINT64                      StackBase;
+
+  //
+  // Report Status Code to indicate entering SEC core  //  DEBUG ((
+    DEBUG_INFO,
+    "%a() BootHartId: 0x%x, DeviceTreeAddress=0x%x\n",
+    __FUNCTION__,
+    BootHartId,
+    DeviceTreeAddress
+    ));
+
+  FirmwareContext.BootHartId          = BootHartId;
+  FirmwareContext.FlattenedDeviceTree = (UINT64)DeviceTreeAddress;  
+ SetFirmwareContextPointer (&FirmwareContext);
+
+  StackBase      = (UINT64)FixedPcdGet32 (PcdOvmfSecPeiTempRamBase);
+  UefiMemoryBase = StackBase +  FixedPcdGet32 
+ (PcdOvmfSecPeiTempRamSize) - SIZE_32MB;
+
+  // Declare the PI/UEFI memory region
+  HobList = HobConstructor (
+              (VOID *)UefiMemoryBase,
+              SIZE_32MB,
+              (VOID *)UefiMemoryBase,
+              (VOID *)StackBase // The top of the UEFI Memory is reserved for the stacks
+              );
+  PrePeiSetHobList (HobList);
+
+  SecInitializePlatform ();
+
+  //
+  // Process all libraries constructor function linked to SecMain.
+  //
+  ProcessLibraryConstructorList ();
+
+  // Assume the FV that contains the SEC (our code) also contains a compressed FV.
+  Status = DecompressFirstFv ();
+  ASSERT_EFI_ERROR (Status);
+
+  // Load the DXE Core and transfer control to it
+  Status = LoadDxeCoreFromFv (NULL, 0);
+  ASSERT_EFI_ERROR (Status);
+  //
+  // Should not come here.
+  //
+  UNREACHABLE ();
+}
diff --git a/OvmfPkg/RiscVVirt/Sec/SecEntry.S b/OvmfPkg/RiscVVirt/Sec/SecEntry.S
new file mode 100644
index 000000000000..e919a3cb0e80
--- /dev/null
+++ b/OvmfPkg/RiscVVirt/Sec/SecEntry.S
@@ -0,0 +1,21 @@
+/*
+  Copyright (c) 2022 Ventana Micro Systems Inc.
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+ */
+
+#include "SecMain.h"
+
+.text
+.align 3
+
+ASM_FUNC (_ModuleEntryPoint)
+  /* Use Temp memory as the stack for calling to C code */
+  li    a4, FixedPcdGet32 (PcdOvmfSecPeiTempRamBase)
+  li    a5, FixedPcdGet32 (PcdOvmfSecPeiTempRamSize)
+
+  /* Use Temp memory as the stack for calling to C code */
+  add   sp, a4, a5
+
+  call SecStartup
--
2.38.0