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* [PATCH 11/15] [platforms/devel-riscv-v2]: U500Pkg/RamFvbServiceruntimeDxe: FVB driver for EFI variable.
@ 2019-09-05  1:24 Gilbert Chen
  0 siblings, 0 replies; only message in thread
From: Gilbert Chen @ 2019-09-05  1:24 UTC (permalink / raw)
  To: devel@edk2.groups.io

Firmware Volume Block driver instance for ram based EFI variable on U500 platform.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gilbert Chen <gilbert.chen@hpe.com>
---
 .../Dxe/RamFvbServicesRuntimeDxe/FvbInfo.c         |  133 +++
 .../FvbServicesRuntimeDxe.inf                      |   88 ++
 .../Dxe/RamFvbServicesRuntimeDxe/FwBlockService.c  | 1129 ++++++++++++++++++++
 .../Dxe/RamFvbServicesRuntimeDxe/FwBlockService.h  |  193 ++++
 .../RamFvbServicesRuntimeDxe/FwBlockServiceDxe.c   |  156 +++
 .../Dxe/RamFvbServicesRuntimeDxe/RamFlash.c        |  151 +++
 .../Dxe/RamFvbServicesRuntimeDxe/RamFlash.h        |   92 ++
 .../Dxe/RamFvbServicesRuntimeDxe/RamFlashDxe.c     |   26 +
 8 files changed, 1968 insertions(+)
 create mode 100644 Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FvbInfo.c
 create mode 100644 Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FvbServicesRuntimeDxe.inf
 create mode 100644 Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockService.c
 create mode 100644 Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockService.h
 create mode 100644 Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockServiceDxe.c
 create mode 100644 Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlash.c
 create mode 100644 Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlash.h
 create mode 100644 Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlashDxe.c

diff --git a/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FvbInfo.c b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FvbInfo.c
new file mode 100644
index 0000000..bfed741
--- /dev/null
+++ b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FvbInfo.c
@@ -0,0 +1,133 @@
+/**@file
+
+  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+  Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  Module Name:
+
+    FvbInfo.c
+
+  Abstract:
+
+    Defines data structure that is the volume header found.These data is intent
+    to decouple FVB driver with FV header.
+
+**/
+
+//
+// The package level header files this module uses
+//
+#include <Pi/PiFirmwareVolume.h>
+
+//
+// The protocols, PPI and GUID defintions for this module
+//
+#include <Guid/SystemNvDataGuid.h>
+//
+// The Library classes this module consumes
+//
+#include <Library/BaseLib.h>
+#include <Library/PcdLib.h>
+
+typedef struct {
+  UINT64                      FvLength;
+  EFI_FIRMWARE_VOLUME_HEADER  FvbInfo;
+  //
+  // EFI_FV_BLOCK_MAP_ENTRY    ExtraBlockMap[n];//n=0
+  //
+  EFI_FV_BLOCK_MAP_ENTRY      End[1];
+} EFI_FVB_MEDIA_INFO;
+
+EFI_FVB_MEDIA_INFO  mPlatformFvbMediaInfo[] = {
+  //
+  // Systen NvStorage FVB
+  //
+  {
+    FixedPcdGet32 (PcdFlashNvStorageVariableSize) +
+    FixedPcdGet32 (PcdFlashNvStorageFtwWorkingSize) +
+    FixedPcdGet32 (PcdFlashNvStorageFtwSpareSize),
+    {
+      {
+        0,
+      },  // ZeroVector[16]
+      EFI_SYSTEM_NV_DATA_FV_GUID,
+      FixedPcdGet32 (PcdFlashNvStorageVariableSize) +
+      FixedPcdGet32 (PcdFlashNvStorageFtwWorkingSize) +
+      FixedPcdGet32 (PcdFlashNvStorageFtwSpareSize),
+      EFI_FVH_SIGNATURE,
+      EFI_FVB2_MEMORY_MAPPED |
+        EFI_FVB2_READ_ENABLED_CAP |
+        EFI_FVB2_READ_STATUS |
+        EFI_FVB2_WRITE_ENABLED_CAP |
+        EFI_FVB2_WRITE_STATUS |
+        EFI_FVB2_ERASE_POLARITY |
+        EFI_FVB2_ALIGNMENT_16,
+      sizeof (EFI_FIRMWARE_VOLUME_HEADER) + sizeof (EFI_FV_BLOCK_MAP_ENTRY),
+      0,  // CheckSum
+      0,  // ExtHeaderOffset
+      {
+        0,
+      },  // Reserved[1]
+      2,  // Revision
+      {
+        {
+          (FixedPcdGet32 (PcdFlashNvStorageVariableSize) +
+           FixedPcdGet32 (PcdFlashNvStorageFtwWorkingSize) +
+           FixedPcdGet32 (PcdFlashNvStorageFtwSpareSize)) /
+          FixedPcdGet32 (PcdVariableFdBlockSize),
+          FixedPcdGet32 (PcdVariableFdBlockSize),
+        }
+      } // BlockMap[1]
+    },
+    {
+      {
+        0,
+        0
+      }
+    }  // End[1]
+  }
+};
+
+EFI_STATUS
+GetFvbInfo (
+  IN  UINT64                        FvLength,
+  OUT EFI_FIRMWARE_VOLUME_HEADER    **FvbInfo
+  )
+{
+  STATIC BOOLEAN Checksummed = FALSE;
+  UINTN Index;
+
+  if (!Checksummed) {
+    for (Index = 0;
+         Index < sizeof (mPlatformFvbMediaInfo) / sizeof (EFI_FVB_MEDIA_INFO);
+         Index += 1) {
+      UINT16 Checksum;
+      mPlatformFvbMediaInfo[Index].FvbInfo.Checksum = 0;
+      Checksum = CalculateCheckSum16 (
+                   (UINT16*) &mPlatformFvbMediaInfo[Index].FvbInfo,
+                   mPlatformFvbMediaInfo[Index].FvbInfo.HeaderLength
+                   );
+      mPlatformFvbMediaInfo[Index].FvbInfo.Checksum = Checksum;
+    }
+    Checksummed = TRUE;
+  }
+
+  for (Index = 0;
+       Index < sizeof (mPlatformFvbMediaInfo) / sizeof (EFI_FVB_MEDIA_INFO);
+       Index += 1) {
+    if (mPlatformFvbMediaInfo[Index].FvLength == FvLength) {
+      *FvbInfo = &mPlatformFvbMediaInfo[Index].FvbInfo;
+      return EFI_SUCCESS;
+    }
+  }
+
+  return EFI_NOT_FOUND;
+}
diff --git a/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FvbServicesRuntimeDxe.inf b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FvbServicesRuntimeDxe.inf
new file mode 100644
index 0000000..e2fba24
--- /dev/null
+++ b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FvbServicesRuntimeDxe.inf
@@ -0,0 +1,88 @@
+## @file
+#  Component description file for RAM Flash Fimware Volume Block DXE driver
+#  module.
+#
+#  This DXE runtime driver implements and produces the Fimware Volue Block
+#  Protocol for a RAM flash device.
+#
+#  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+#  Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
+#
+#  This program and the accompanying materials are licensed and made available
+#  under the terms and conditions of the BSD License which accompanies this
+#  distribution. The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR
+#  IMPLIED.
+#
+##
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = FvbServicesRuntimeDxe
+  FILE_GUID                      = B04036D3-4C60-43D6-9850-0FCC090FF054
+  MODULE_TYPE                    = DXE_RUNTIME_DRIVER
+  VERSION_STRING                 = 1.0
+  ENTRY_POINT                    = FvbInitialize
+
+#
+# The following information is for reference only and not required by the build
+# tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64
+#
+
+[Sources]
+  FvbInfo.c
+  FwBlockService.c
+  FwBlockServiceDxe.c
+  RamFlash.c
+  RamFlashDxe.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  Platform/RiscV/RiscVPlatformPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  DevicePathLib
+  DxeServicesTableLib
+  MemoryAllocationLib
+  PcdLib
+  UefiBootServicesTableLib
+  UefiDriverEntryPoint
+  UefiRuntimeLib
+
+[Guids]
+  gEfiEventVirtualAddressChangeGuid   # ALWAYS_CONSUMED
+  # gEfiEventVirtualAddressChangeGuid # Create Event: EVENT_GROUP_GUID
+
+[Protocols]
+  gEfiFirmwareVolumeBlockProtocolGuid           # PROTOCOL SOMETIMES_PRODUCED
+  gEfiDevicePathProtocolGuid                    # PROTOCOL SOMETIMES_PRODUCED
+
+[FixedPcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableSize
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingSize
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize
+
+  gUefiRiscVPlatformPkgTokenSpaceGuid.PcdPlatformFlashNvStorageVariableBase
+  gUefiRiscVPlatformPkgTokenSpaceGuid.PcdPlatformFlashNvStorageFtwWorkingBase
+  gUefiRiscVPlatformPkgTokenSpaceGuid.PcdPlatformFlashNvStorageFtwSpareBase
+  gUefiRiscVPlatformPkgTokenSpaceGuid.PcdVariableFdBaseAddress
+  gUefiRiscVPlatformPkgTokenSpaceGuid.PcdVariableFdSize
+  gUefiRiscVPlatformPkgTokenSpaceGuid.PcdVariableFdBlockSize
+
+[Pcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwWorkingBase
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareBase
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase
+  gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageVariableBase64
+
+[Depex]
+  TRUE
diff --git a/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockService.c b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockService.c
new file mode 100644
index 0000000..b1a01e7
--- /dev/null
+++ b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockService.c
@@ -0,0 +1,1129 @@
+/**@file
+
+  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+  Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  Module Name:
+
+    FWBlockService.c
+
+  Abstract:
+
+  Revision History
+
+**/
+
+//
+// The protocols, PPI and GUID defintions for this module
+//
+#include <Protocol/DevicePath.h>
+#include <Protocol/FirmwareVolumeBlock.h>
+
+//
+// The Library classes this module consumes
+//
+#include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+#include "FwBlockService.h"
+#include "RamFlash.h"
+
+#define EFI_FVB2_STATUS \
+          (EFI_FVB2_READ_STATUS | EFI_FVB2_WRITE_STATUS | EFI_FVB2_LOCK_STATUS)
+
+ESAL_FWB_GLOBAL         *mFvbModuleGlobal;
+
+FV_MEMMAP_DEVICE_PATH mFvMemmapDevicePathTemplate = {
+  {
+    {
+      HARDWARE_DEVICE_PATH,
+      HW_MEMMAP_DP,
+      {
+        (UINT8)(sizeof (MEMMAP_DEVICE_PATH)),
+        (UINT8)(sizeof (MEMMAP_DEVICE_PATH) >> 8)
+      }
+    },
+    EfiMemoryMappedIO,
+    (EFI_PHYSICAL_ADDRESS) 0,
+    (EFI_PHYSICAL_ADDRESS) 0,
+  },
+  {
+    END_DEVICE_PATH_TYPE,
+    END_ENTIRE_DEVICE_PATH_SUBTYPE,
+    {
+      END_DEVICE_PATH_LENGTH,
+      0
+    }
+  }
+};
+
+FV_PIWG_DEVICE_PATH mFvPIWGDevicePathTemplate = {
+  {
+    {
+      MEDIA_DEVICE_PATH,
+      MEDIA_PIWG_FW_VOL_DP,
+      {
+        (UINT8)(sizeof (MEDIA_FW_VOL_DEVICE_PATH)),
+        (UINT8)(sizeof (MEDIA_FW_VOL_DEVICE_PATH) >> 8)
+      }
+    },
+    { 0 }
+  },
+  {
+    END_DEVICE_PATH_TYPE,
+    END_ENTIRE_DEVICE_PATH_SUBTYPE,
+    {
+      END_DEVICE_PATH_LENGTH,
+      0
+    }
+  }
+};
+
+EFI_FW_VOL_BLOCK_DEVICE mFvbDeviceTemplate = {
+  FVB_DEVICE_SIGNATURE,
+  NULL,
+  0,
+  {
+    FvbProtocolGetAttributes,
+    FvbProtocolSetAttributes,
+    FvbProtocolGetPhysicalAddress,
+    FvbProtocolGetBlockSize,
+    FvbProtocolRead,
+    FvbProtocolWrite,
+    FvbProtocolEraseBlocks,
+    NULL
+  }
+};
+
+
+EFI_STATUS
+GetFvbInstance (
+  IN  UINTN                               Instance,
+  IN  ESAL_FWB_GLOBAL                     *Global,
+  OUT EFI_FW_VOL_INSTANCE                 **FwhInstance
+  )
+/*++
+
+  Routine Description:
+    Retrieves the physical address of a memory mapped FV
+
+  Arguments:
+    Instance              - The FV instance whose base address is going to be
+                            returned
+    Global                - Pointer to ESAL_FWB_GLOBAL that contains all
+                            instance data
+    FwhInstance           - The EFI_FW_VOL_INSTANCE fimrware instance structure
+
+  Returns:
+    EFI_SUCCESS           - Successfully returns
+    EFI_INVALID_PARAMETER - Instance not found
+
+--*/
+{
+  EFI_FW_VOL_INSTANCE *FwhRecord;
+
+  *FwhInstance = NULL;
+  if (Instance >= Global->NumFv) {
+    return EFI_INVALID_PARAMETER;
+  }
+  //
+  // Find the right instance of the FVB private data
+  //
+  FwhRecord = Global->FvInstance;
+  while (Instance > 0) {
+    FwhRecord = (EFI_FW_VOL_INSTANCE *)
+      (
+        (UINTN) ((UINT8 *) FwhRecord) + FwhRecord->VolumeHeader.HeaderLength +
+          (sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER))
+      );
+    Instance--;
+  }
+
+  *FwhInstance = FwhRecord;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+FvbGetPhysicalAddress (
+  IN UINTN                                Instance,
+  OUT EFI_PHYSICAL_ADDRESS                *Address,
+  IN ESAL_FWB_GLOBAL                      *Global
+  )
+/*++
+
+  Routine Description:
+    Retrieves the physical address of a memory mapped FV
+
+  Arguments:
+    Instance              - The FV instance whose base address is going to be
+                            returned
+    Address               - Pointer to a caller allocated EFI_PHYSICAL_ADDRESS
+                            that on successful return, contains the base
+                            address of the firmware volume.
+    Global                - Pointer to ESAL_FWB_GLOBAL that contains all
+                            instance data
+
+  Returns:
+    EFI_SUCCESS           - Successfully returns
+    EFI_INVALID_PARAMETER - Instance not found
+
+--*/
+{
+  EFI_FW_VOL_INSTANCE *FwhInstance;
+  EFI_STATUS          Status;
+
+  //
+  // Find the right instance of the FVB private data
+  //
+  Status = GetFvbInstance (Instance, Global, &FwhInstance);
+  ASSERT_EFI_ERROR (Status);
+  *Address = FwhInstance->FvBase;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+FvbGetVolumeAttributes (
+  IN UINTN                                Instance,
+  OUT EFI_FVB_ATTRIBUTES_2                *Attributes,
+  IN ESAL_FWB_GLOBAL                      *Global
+  )
+/*++
+
+  Routine Description:
+    Retrieves attributes, insures positive polarity of attribute bits, returns
+    resulting attributes in output parameter
+
+  Arguments:
+    Instance              - The FV instance whose attributes is going to be
+                            returned
+    Attributes            - Output buffer which contains attributes
+    Global                - Pointer to ESAL_FWB_GLOBAL that contains all
+                            instance data
+
+  Returns:
+    EFI_SUCCESS           - Successfully returns
+    EFI_INVALID_PARAMETER - Instance not found
+
+--*/
+{
+  EFI_FW_VOL_INSTANCE *FwhInstance;
+  EFI_STATUS          Status;
+
+  //
+  // Find the right instance of the FVB private data
+  //
+  Status = GetFvbInstance (Instance, Global, &FwhInstance);
+  ASSERT_EFI_ERROR (Status);
+  *Attributes = FwhInstance->VolumeHeader.Attributes;
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+FvbGetLbaAddress (
+  IN  UINTN                               Instance,
+  IN  EFI_LBA                             Lba,
+  OUT UINTN                               *LbaAddress,
+  OUT UINTN                               *LbaLength,
+  OUT UINTN                               *NumOfBlocks,
+  IN  ESAL_FWB_GLOBAL                     *Global
+  )
+/*++
+
+  Routine Description:
+    Retrieves the starting address of an LBA in an FV
+
+  Arguments:
+    Instance              - The FV instance which the Lba belongs to
+    Lba                   - The logical block address
+    LbaAddress            - On output, contains the physical starting address
+                            of the Lba
+    LbaLength             - On output, contains the length of the block
+    NumOfBlocks           - A pointer to a caller allocated UINTN in which the
+                            number of consecutive blocks starting with Lba is
+                            returned. All blocks in this range have a size of
+                            BlockSize
+    Global                - Pointer to ESAL_FWB_GLOBAL that contains all
+                            instance data
+
+  Returns:
+    EFI_SUCCESS           - Successfully returns
+    EFI_INVALID_PARAMETER - Instance not found
+
+--*/
+{
+  UINT32                  NumBlocks;
+  UINT32                  BlockLength;
+  UINTN                   Offset;
+  EFI_LBA                 StartLba;
+  EFI_LBA                 NextLba;
+  EFI_FW_VOL_INSTANCE     *FwhInstance;
+  EFI_FV_BLOCK_MAP_ENTRY  *BlockMap;
+  EFI_STATUS              Status;
+
+  //
+  // Find the right instance of the FVB private data
+  //
+  Status = GetFvbInstance (Instance, Global, &FwhInstance);
+  ASSERT_EFI_ERROR (Status);
+
+  StartLba  = 0;
+  Offset    = 0;
+  BlockMap  = &(FwhInstance->VolumeHeader.BlockMap[0]);
+
+  //
+  // Parse the blockmap of the FV to find which map entry the Lba belongs to
+  //
+  while (TRUE) {
+    NumBlocks   = BlockMap->NumBlocks;
+    BlockLength = BlockMap->Length;
+
+    if (NumBlocks == 0 || BlockLength == 0) {
+      return EFI_INVALID_PARAMETER;
+    }
+
+    NextLba = StartLba + NumBlocks;
+
+    //
+    // The map entry found
+    //
+    if (Lba >= StartLba && Lba < NextLba) {
+      Offset = Offset + (UINTN) MultU64x32 ((Lba - StartLba), BlockLength);
+      if (LbaAddress != NULL) {
+        *LbaAddress = FwhInstance->FvBase + Offset;
+      }
+
+      if (LbaLength != NULL) {
+        *LbaLength = BlockLength;
+      }
+
+      if (NumOfBlocks != NULL) {
+        *NumOfBlocks = (UINTN) (NextLba - Lba);
+      }
+
+      return EFI_SUCCESS;
+    }
+
+    StartLba  = NextLba;
+    Offset    = Offset + NumBlocks * BlockLength;
+    BlockMap++;
+  }
+}
+
+EFI_STATUS
+FvbSetVolumeAttributes (
+  IN UINTN                                  Instance,
+  IN OUT EFI_FVB_ATTRIBUTES_2               *Attributes,
+  IN ESAL_FWB_GLOBAL                        *Global
+  )
+/*++
+
+  Routine Description:
+    Modifies the current settings of the firmware volume according to the
+    input parameter, and returns the new setting of the volume
+
+  Arguments:
+    Instance              - The FV instance whose attributes is going to be
+                            modified
+    Attributes            - On input, it is a pointer to EFI_FVB_ATTRIBUTES_2
+                            containing the desired firmware volume settings.
+                            On successful return, it contains the new settings
+                            of the firmware volume
+    Global                - Pointer to ESAL_FWB_GLOBAL that contains all
+                            instance data
+
+  Returns:
+    EFI_SUCCESS           - Successfully returns
+    EFI_ACCESS_DENIED     - The volume setting is locked and cannot be modified
+    EFI_INVALID_PARAMETER - Instance not found, or The attributes requested are
+                            in conflict with the capabilities as declared in
+                            the firmware volume header
+
+--*/
+{
+  EFI_FW_VOL_INSTANCE   *FwhInstance;
+  EFI_FVB_ATTRIBUTES_2  OldAttributes;
+  EFI_FVB_ATTRIBUTES_2  *AttribPtr;
+  UINT32                Capabilities;
+  UINT32                OldStatus;
+  UINT32                NewStatus;
+  EFI_STATUS            Status;
+  EFI_FVB_ATTRIBUTES_2  UnchangedAttributes;
+
+  //
+  // Find the right instance of the FVB private data
+  //
+  Status = GetFvbInstance (Instance, Global, &FwhInstance);
+  ASSERT_EFI_ERROR (Status);
+
+  AttribPtr     =
+    (EFI_FVB_ATTRIBUTES_2 *) &(FwhInstance->VolumeHeader.Attributes);
+  OldAttributes = *AttribPtr;
+  Capabilities  = OldAttributes & (EFI_FVB2_READ_DISABLED_CAP | \
+                                   EFI_FVB2_READ_ENABLED_CAP | \
+                                   EFI_FVB2_WRITE_DISABLED_CAP | \
+                                   EFI_FVB2_WRITE_ENABLED_CAP | \
+                                   EFI_FVB2_LOCK_CAP \
+                                   );
+  OldStatus     = OldAttributes & EFI_FVB2_STATUS;
+  NewStatus     = *Attributes & EFI_FVB2_STATUS;
+
+  UnchangedAttributes = EFI_FVB2_READ_DISABLED_CAP  | \
+                        EFI_FVB2_READ_ENABLED_CAP   | \
+                        EFI_FVB2_WRITE_DISABLED_CAP | \
+                        EFI_FVB2_WRITE_ENABLED_CAP  | \
+                        EFI_FVB2_LOCK_CAP           | \
+                        EFI_FVB2_STICKY_WRITE       | \
+                        EFI_FVB2_MEMORY_MAPPED      | \
+                        EFI_FVB2_ERASE_POLARITY     | \
+                        EFI_FVB2_READ_LOCK_CAP      | \
+                        EFI_FVB2_WRITE_LOCK_CAP     | \
+                        EFI_FVB2_ALIGNMENT;
+
+  //
+  // Some attributes of FV is read only can *not* be set
+  //
+  if ((OldAttributes & UnchangedAttributes) ^
+      (*Attributes & UnchangedAttributes)) {
+    return EFI_INVALID_PARAMETER;
+  }
+  //
+  // If firmware volume is locked, no status bit can be updated
+  //
+  if (OldAttributes & EFI_FVB2_LOCK_STATUS) {
+    if (OldStatus ^ NewStatus) {
+      return EFI_ACCESS_DENIED;
+    }
+  }
+  //
+  // Test read disable
+  //
+  if ((Capabilities & EFI_FVB2_READ_DISABLED_CAP) == 0) {
+    if ((NewStatus & EFI_FVB2_READ_STATUS) == 0) {
+      return EFI_INVALID_PARAMETER;
+    }
+  }
+  //
+  // Test read enable
+  //
+  if ((Capabilities & EFI_FVB2_READ_ENABLED_CAP) == 0) {
+    if (NewStatus & EFI_FVB2_READ_STATUS) {
+      return EFI_INVALID_PARAMETER;
+    }
+  }
+  //
+  // Test write disable
+  //
+  if ((Capabilities & EFI_FVB2_WRITE_DISABLED_CAP) == 0) {
+    if ((NewStatus & EFI_FVB2_WRITE_STATUS) == 0) {
+      return EFI_INVALID_PARAMETER;
+    }
+  }
+  //
+  // Test write enable
+  //
+  if ((Capabilities & EFI_FVB2_WRITE_ENABLED_CAP) == 0) {
+    if (NewStatus & EFI_FVB2_WRITE_STATUS) {
+      return EFI_INVALID_PARAMETER;
+    }
+  }
+  //
+  // Test lock
+  //
+  if ((Capabilities & EFI_FVB2_LOCK_CAP) == 0) {
+    if (NewStatus & EFI_FVB2_LOCK_STATUS) {
+      return EFI_INVALID_PARAMETER;
+    }
+  }
+
+  *AttribPtr  = (*AttribPtr) & (0xFFFFFFFF & (~EFI_FVB2_STATUS));
+  *AttribPtr  = (*AttribPtr) | NewStatus;
+  *Attributes = *AttribPtr;
+
+  return EFI_SUCCESS;
+}
+
+//
+// FVB protocol APIs
+//
+EFI_STATUS
+EFIAPI
+FvbProtocolGetPhysicalAddress (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  OUT EFI_PHYSICAL_ADDRESS                        *Address
+  )
+/*++
+
+  Routine Description:
+
+    Retrieves the physical address of the device.
+
+  Arguments:
+
+    This                  - Calling context
+    Address               - Output buffer containing the address.
+
+  Returns:
+    EFI_SUCCESS           - Successfully returns
+
+--*/
+{
+  EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
+
+  FvbDevice = FVB_DEVICE_FROM_THIS (This);
+
+  return FvbGetPhysicalAddress (FvbDevice->Instance, Address,
+           mFvbModuleGlobal);
+}
+
+EFI_STATUS
+EFIAPI
+FvbProtocolGetBlockSize (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  IN CONST EFI_LBA                                     Lba,
+  OUT UINTN                                       *BlockSize,
+  OUT UINTN                                       *NumOfBlocks
+  )
+/*++
+
+  Routine Description:
+    Retrieve the size of a logical block
+
+  Arguments:
+    This                  - Calling context
+    Lba                   - Indicates which block to return the size for.
+    BlockSize             - A pointer to a caller allocated UINTN in which
+                            the size of the block is returned
+    NumOfBlocks           - a pointer to a caller allocated UINTN in which the
+                            number of consecutive blocks starting with Lba is
+                            returned. All blocks in this range have a size of
+                            BlockSize
+
+  Returns:
+    EFI_SUCCESS           - The firmware volume was read successfully and
+                            contents are in Buffer
+
+--*/
+{
+  EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
+
+  FvbDevice = FVB_DEVICE_FROM_THIS (This);
+
+  return FvbGetLbaAddress (
+          FvbDevice->Instance,
+          Lba,
+          NULL,
+          BlockSize,
+          NumOfBlocks,
+          mFvbModuleGlobal
+          );
+}
+
+EFI_STATUS
+EFIAPI
+FvbProtocolGetAttributes (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  OUT EFI_FVB_ATTRIBUTES_2                              *Attributes
+  )
+/*++
+
+  Routine Description:
+      Retrieves Volume attributes.  No polarity translations are done.
+
+  Arguments:
+      This                - Calling context
+      Attributes          - output buffer which contains attributes
+
+  Returns:
+    EFI_SUCCESS           - Successfully returns
+
+--*/
+{
+  EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
+
+  FvbDevice = FVB_DEVICE_FROM_THIS (This);
+
+  return FvbGetVolumeAttributes (FvbDevice->Instance, Attributes,
+           mFvbModuleGlobal);
+}
+
+EFI_STATUS
+EFIAPI
+FvbProtocolSetAttributes (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  IN OUT EFI_FVB_ATTRIBUTES_2                           *Attributes
+  )
+/*++
+
+  Routine Description:
+    Sets Volume attributes. No polarity translations are done.
+
+  Arguments:
+    This                  - Calling context
+    Attributes            - output buffer which contains attributes
+
+  Returns:
+    EFI_SUCCESS           - Successfully returns
+
+--*/
+{
+  EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
+
+  FvbDevice = FVB_DEVICE_FROM_THIS (This);
+
+  return FvbSetVolumeAttributes (FvbDevice->Instance, Attributes,
+           mFvbModuleGlobal);
+}
+
+EFI_STATUS
+EFIAPI
+FvbProtocolEraseBlocks (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL    *This,
+  ...
+  )
+/*++
+
+  Routine Description:
+
+    The EraseBlock() function erases one or more blocks as denoted by the
+    variable argument list. The entire parameter list of blocks must be
+    verified prior to erasing any blocks.  If a block is requested that does
+    not exist within the associated firmware volume (it has a larger index than
+    the last block of the firmware volume), the EraseBlock() function must
+    return EFI_INVALID_PARAMETER without modifying the contents of the firmware
+    volume.
+
+  Arguments:
+    This                  - Calling context
+    ...                   - Starting LBA followed by Number of Lba to erase.
+                            a -1 to terminate the list.
+
+  Returns:
+    EFI_SUCCESS           - The erase request was successfully completed
+    EFI_ACCESS_DENIED     - The firmware volume is in the WriteDisabled state
+    EFI_DEVICE_ERROR      - The block device is not functioning correctly and
+                            could not be written. Firmware device may have been
+                            partially erased
+
+--*/
+{
+  EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
+  EFI_FW_VOL_INSTANCE     *FwhInstance;
+  UINTN                   NumOfBlocks;
+  VA_LIST                 args;
+  EFI_LBA                 StartingLba;
+  UINTN                   NumOfLba;
+  EFI_STATUS              Status;
+
+  FvbDevice = FVB_DEVICE_FROM_THIS (This);
+
+  Status    = GetFvbInstance (FvbDevice->Instance, mFvbModuleGlobal,
+                &FwhInstance);
+  ASSERT_EFI_ERROR (Status);
+
+  NumOfBlocks = FwhInstance->NumOfBlocks;
+
+  VA_START (args, This);
+
+  do {
+    StartingLba = VA_ARG (args, EFI_LBA);
+    if (StartingLba == EFI_LBA_LIST_TERMINATOR) {
+      break;
+    }
+
+    NumOfLba = VA_ARG (args, UINT32);
+
+    //
+    // Check input parameters
+    //
+    if ((NumOfLba == 0) || ((StartingLba + NumOfLba) > NumOfBlocks)) {
+      VA_END (args);
+      return EFI_INVALID_PARAMETER;
+    }
+  } while (1);
+
+  VA_END (args);
+
+  VA_START (args, This);
+  do {
+    StartingLba = VA_ARG (args, EFI_LBA);
+    if (StartingLba == EFI_LBA_LIST_TERMINATOR) {
+      break;
+    }
+
+    NumOfLba = VA_ARG (args, UINT32);
+
+    while (NumOfLba > 0) {
+      Status = RamFlashEraseBlock (StartingLba);
+      if (EFI_ERROR (Status)) {
+        VA_END (args);
+        return Status;
+      }
+
+      StartingLba++;
+      NumOfLba--;
+    }
+
+  } while (1);
+
+  VA_END (args);
+
+  return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+FvbProtocolWrite (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  IN       EFI_LBA                                      Lba,
+  IN       UINTN                                        Offset,
+  IN OUT   UINTN                                    *NumBytes,
+  IN       UINT8                                        *Buffer
+  )
+/*++
+
+  Routine Description:
+
+    Writes data beginning at Lba:Offset from FV. The write terminates either
+    when *NumBytes of data have been written, or when a block boundary is
+    reached.  *NumBytes is updated to reflect the actual number of bytes
+    written. The write opertion does not include erase. This routine will
+    attempt to write only the specified bytes. If the writes do not stick,
+    it will return an error.
+
+  Arguments:
+    This                  - Calling context
+    Lba                   - Block in which to begin write
+    Offset                - Offset in the block at which to begin write
+    NumBytes              - On input, indicates the requested write size. On
+                            output, indicates the actual number of bytes
+                            written
+    Buffer                - Buffer containing source data for the write.
+
+  Returns:
+    EFI_SUCCESS           - The firmware volume was written successfully
+    EFI_BAD_BUFFER_SIZE   - Write attempted across a LBA boundary. On output,
+                            NumBytes contains the total number of bytes
+                            actually written
+    EFI_ACCESS_DENIED     - The firmware volume is in the WriteDisabled state
+    EFI_DEVICE_ERROR      - The block device is not functioning correctly and
+                            could not be written
+    EFI_INVALID_PARAMETER - NumBytes or Buffer are NULL
+
+--*/
+{
+  return RamFlashWrite ((EFI_LBA)Lba, (UINTN)Offset, NumBytes,
+           (UINT8 *)Buffer);
+}
+
+EFI_STATUS
+EFIAPI
+FvbProtocolRead (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  IN CONST EFI_LBA                                      Lba,
+  IN CONST UINTN                                        Offset,
+  IN OUT UINTN                                    *NumBytes,
+  IN UINT8                                        *Buffer
+  )
+/*++
+
+  Routine Description:
+
+    Reads data beginning at Lba:Offset from FV. The Read terminates either
+    when *NumBytes of data have been read, or when a block boundary is
+    reached.  *NumBytes is updated to reflect the actual number of bytes
+    written. The write opertion does not include erase. This routine will
+    attempt to write only the specified bytes. If the writes do not stick,
+    it will return an error.
+
+  Arguments:
+    This                  - Calling context
+    Lba                   - Block in which to begin Read
+    Offset                - Offset in the block at which to begin Read
+    NumBytes              - On input, indicates the requested write size. On
+                            output, indicates the actual number of bytes Read
+    Buffer                - Buffer containing source data for the Read.
+
+  Returns:
+    EFI_SUCCESS           - The firmware volume was read successfully and
+                            contents are in Buffer
+    EFI_BAD_BUFFER_SIZE   - Read attempted across a LBA boundary. On output,
+                            NumBytes contains the total number of bytes
+                            returned in Buffer
+    EFI_ACCESS_DENIED     - The firmware volume is in the ReadDisabled state
+    EFI_DEVICE_ERROR      - The block device is not functioning correctly and
+                            could not be read
+    EFI_INVALID_PARAMETER - NumBytes or Buffer are NULL
+
+--*/
+{
+  return RamFlashRead ((EFI_LBA)Lba, (UINTN)Offset, NumBytes,
+           (UINT8 *)Buffer);
+}
+
+EFI_STATUS
+ValidateFvHeader (
+  EFI_FIRMWARE_VOLUME_HEADER            *FwVolHeader
+  )
+/*++
+
+  Routine Description:
+    Check the integrity of firmware volume header
+
+  Arguments:
+    FwVolHeader           - A pointer to a firmware volume header
+
+  Returns:
+    EFI_SUCCESS           - The firmware volume is consistent
+    EFI_NOT_FOUND         - The firmware volume has corrupted. So it is not an
+                            FV
+
+--*/
+{
+  UINT16 Checksum;
+
+  //
+  // Verify the header revision, header signature, length
+  // Length of FvBlock cannot be 2**64-1
+  // HeaderLength cannot be an odd number
+  //
+  if ((FwVolHeader->Revision != EFI_FVH_REVISION) ||
+      (FwVolHeader->Signature != EFI_FVH_SIGNATURE) ||
+      (FwVolHeader->FvLength == ((UINTN) -1)) ||
+      ((FwVolHeader->HeaderLength & 0x01) != 0)
+      ) {
+    return EFI_NOT_FOUND;
+  }
+
+  //
+  // Verify the header checksum
+  //
+
+  Checksum = CalculateSum16 ((UINT16 *) FwVolHeader,
+               FwVolHeader->HeaderLength);
+  if (Checksum != 0) {
+    UINT16 Expected;
+
+    Expected =
+      (UINT16) (((UINTN) FwVolHeader->Checksum + 0x10000 - Checksum) & 0xffff);
+
+    DEBUG ((EFI_D_INFO, "FV@%p Checksum is 0x%x, expected 0x%x\n",
+            FwVolHeader, FwVolHeader->Checksum, Expected));
+    return EFI_NOT_FOUND;
+  }
+
+  return EFI_SUCCESS;
+}
+
+STATIC
+EFI_STATUS
+MarkMemoryRangeForRuntimeAccess (
+  EFI_PHYSICAL_ADDRESS                BaseAddress,
+  UINTN                               Length
+  )
+{
+  EFI_STATUS                          Status;
+
+  //
+  // Mark flash region as runtime memory
+  //
+  Status = gDS->RemoveMemorySpace (
+                  BaseAddress,
+                  Length
+                  );
+
+  Status = gDS->AddMemorySpace (
+                  EfiGcdMemoryTypeSystemMemory,
+                  BaseAddress,
+                  Length,
+                  EFI_MEMORY_UC | EFI_MEMORY_RUNTIME
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+  Status = gBS->AllocatePages (
+                  AllocateAddress,
+                  EfiRuntimeServicesData,
+                  EFI_SIZE_TO_PAGES (Length),
+                  &BaseAddress
+                  );
+  ASSERT_EFI_ERROR (Status);
+
+  return Status;
+}
+
+STATIC
+EFI_STATUS
+InitializeVariableFvHeader (
+  VOID
+  )
+{
+  EFI_STATUS                          Status;
+  EFI_FIRMWARE_VOLUME_HEADER          *GoodFwVolHeader;
+  EFI_FIRMWARE_VOLUME_HEADER          *FwVolHeader;
+  UINTN                               Length;
+  UINTN                               WriteLength;
+  UINTN                               BlockSize;
+
+  FwVolHeader =
+    (EFI_FIRMWARE_VOLUME_HEADER *) (UINTN)
+      PcdGet32 (PcdPlatformFlashNvStorageVariableBase);
+
+  Length =
+    (FixedPcdGet32 (PcdFlashNvStorageVariableSize) +
+     FixedPcdGet32 (PcdFlashNvStorageFtwWorkingSize) +
+     FixedPcdGet32 (PcdFlashNvStorageFtwSpareSize));
+
+  BlockSize = PcdGet32 (PcdVariableFdBlockSize);
+
+  Status      = ValidateFvHeader (FwVolHeader);
+  if (!EFI_ERROR (Status)) {
+    DEBUG ((EFI_D_INFO, "ValidateFvHeader() return ok\n"));
+    if (FwVolHeader->FvLength != Length ||
+        FwVolHeader->BlockMap[0].Length != BlockSize) {
+      Status = EFI_VOLUME_CORRUPTED;
+     DEBUG ((EFI_D_INFO, "FwVolHeader->FvLength(%x) != Length(%x) || FwVolHeader->BlockMap[0].Length(%x) != BlockSize(%x)\n", FwVolHeader->FvLength, Length, FwVolHeader->BlockMap[0].Length, BlockSize));
+    }
+  }
+  else {
+    DEBUG ((EFI_D_INFO, "ValidateFvHeader() return failed\n"));
+  }
+  if (EFI_ERROR (Status)) {
+    UINTN   Offset;
+    UINTN   Start;
+
+    DEBUG ((EFI_D_INFO,
+      "Variable FV header is not valid. It will be reinitialized.\n"));
+
+    //
+    // Get FvbInfo to provide in FwhInstance.
+    //
+    Status = GetFvbInfo (Length, &GoodFwVolHeader);
+    ASSERT (!EFI_ERROR (Status));
+
+    Start = (UINTN)(UINT8*) FwVolHeader - PcdGet32 (PcdVariableFdBaseAddress);
+    ASSERT (Start % BlockSize == 0 && Length % BlockSize == 0);
+    ASSERT (GoodFwVolHeader->HeaderLength <= BlockSize);
+
+    //
+    // Erase all the blocks
+    //
+    for (Offset = Start; Offset < Start + Length; Offset += BlockSize) {
+      Status = RamFlashEraseBlock (Offset / BlockSize);
+      ASSERT_EFI_ERROR (Status);
+    }
+
+    //
+    // Write good FV header
+    //
+    WriteLength = GoodFwVolHeader->HeaderLength;
+    Status = RamFlashWrite (
+               Start / BlockSize,
+               0,
+               &WriteLength,
+               (UINT8 *) GoodFwVolHeader);
+    ASSERT_EFI_ERROR (Status);
+    ASSERT (WriteLength == GoodFwVolHeader->HeaderLength);
+  }
+
+  return Status;
+}
+
+EFI_STATUS
+EFIAPI
+FvbInitialize (
+  IN EFI_HANDLE         ImageHandle,
+  IN EFI_SYSTEM_TABLE   *SystemTable
+  )
+/*++
+
+  Routine Description:
+    This function does common initialization for FVB services
+
+  Arguments:
+
+  Returns:
+
+--*/
+{
+  EFI_STATUS                          Status;
+  EFI_FW_VOL_INSTANCE                 *FwhInstance;
+  EFI_FIRMWARE_VOLUME_HEADER          *FwVolHeader;
+  UINT32                              BufferSize;
+  EFI_FV_BLOCK_MAP_ENTRY              *PtrBlockMapEntry;
+  EFI_FW_VOL_BLOCK_DEVICE             *FvbDevice;
+  UINT32                              MaxLbaSize;
+  EFI_PHYSICAL_ADDRESS                BaseAddress;
+  UINTN                               Length;
+  UINTN                               NumOfBlocks;
+
+  if (EFI_ERROR (RamFlashInitialize ())) {
+    //
+    // Return an error so image will be unloaded
+    //
+    DEBUG ((EFI_D_INFO,
+      "RAM flash was not detected. Writable FVB is not being installed.\n"));
+    return EFI_WRITE_PROTECTED;
+  }
+
+  //
+  // Allocate runtime services data for global variable, which contains
+  // the private data of all firmware volume block instances
+  //
+  mFvbModuleGlobal = AllocateRuntimePool (sizeof (ESAL_FWB_GLOBAL));
+  ASSERT (mFvbModuleGlobal != NULL);
+
+  BaseAddress = (UINTN) PcdGet32 (PcdVariableFdBaseAddress);
+  Length = PcdGet32 (PcdVariableFdSize);
+  DEBUG ((EFI_D_INFO, "FvbInitialize(): BaseAddress: 0x%lx Length:0x%x\n", BaseAddress, Length));
+  Status = InitializeVariableFvHeader ();
+  if (EFI_ERROR (Status)) {
+    DEBUG ((EFI_D_INFO,
+      "RAM Flash: Unable to initialize variable FV header\n"));
+    return EFI_WRITE_PROTECTED;
+  }
+
+  FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) BaseAddress;
+  Status      = ValidateFvHeader (FwVolHeader);
+  if (EFI_ERROR (Status)) {
+    //
+    // Get FvbInfo
+    //
+    DEBUG ((EFI_D_INFO, "FvbInitialize(): ValidateFvHeader() return error(%r)\n", Status));
+
+    Status = GetFvbInfo (Length, &FwVolHeader);
+    if (EFI_ERROR (Status)) {
+      DEBUG ((EFI_D_INFO, "FvbInitialize(): GetFvbInfo (Length, &FwVolHeader) return error(%r)\n", Status));
+      return EFI_WRITE_PROTECTED;
+    }
+  }
+
+  BufferSize = (sizeof (EFI_FW_VOL_INSTANCE) +
+                FwVolHeader->HeaderLength -
+                sizeof (EFI_FIRMWARE_VOLUME_HEADER)
+                );
+  mFvbModuleGlobal->FvInstance = AllocateRuntimePool (BufferSize);
+  ASSERT (mFvbModuleGlobal->FvInstance != NULL);
+
+  FwhInstance = mFvbModuleGlobal->FvInstance;
+
+  mFvbModuleGlobal->NumFv                   = 0;
+  MaxLbaSize = 0;
+
+  FwVolHeader =
+    (EFI_FIRMWARE_VOLUME_HEADER *) (UINTN)
+      PcdGet32 (PcdPlatformFlashNvStorageVariableBase);
+
+  FwhInstance->FvBase = (UINTN) BaseAddress;
+
+  CopyMem ((UINTN *) &(FwhInstance->VolumeHeader), (UINTN *) FwVolHeader,
+    FwVolHeader->HeaderLength);
+  FwVolHeader = &(FwhInstance->VolumeHeader);
+
+  NumOfBlocks = 0;
+
+  for (PtrBlockMapEntry = FwVolHeader->BlockMap;
+       PtrBlockMapEntry->NumBlocks != 0;
+       PtrBlockMapEntry++) {
+    //
+    // Get the maximum size of a block.
+    //
+    if (MaxLbaSize < PtrBlockMapEntry->Length) {
+      MaxLbaSize = PtrBlockMapEntry->Length;
+    }
+
+    NumOfBlocks = NumOfBlocks + PtrBlockMapEntry->NumBlocks;
+  }
+
+  //
+  // The total number of blocks in the FV.
+  //
+  FwhInstance->NumOfBlocks = NumOfBlocks;
+
+  //
+  // Add a FVB Protocol Instance
+  //
+  FvbDevice = AllocateRuntimePool (sizeof (EFI_FW_VOL_BLOCK_DEVICE));
+  ASSERT (FvbDevice != NULL);
+
+  CopyMem (FvbDevice, &mFvbDeviceTemplate, sizeof (EFI_FW_VOL_BLOCK_DEVICE));
+
+  FvbDevice->Instance = mFvbModuleGlobal->NumFv;
+  mFvbModuleGlobal->NumFv++;
+
+  //
+  // Set up the devicepath
+  //
+  if (FwVolHeader->ExtHeaderOffset == 0) {
+    FV_MEMMAP_DEVICE_PATH *FvMemmapDevicePath;
+
+    //
+    // FV does not contains extension header, then produce MEMMAP_DEVICE_PATH
+    //
+    FvMemmapDevicePath = AllocateCopyPool (sizeof (FV_MEMMAP_DEVICE_PATH),
+                           &mFvMemmapDevicePathTemplate);
+    FvMemmapDevicePath->MemMapDevPath.StartingAddress = BaseAddress;
+    FvMemmapDevicePath->MemMapDevPath.EndingAddress   =
+      BaseAddress + FwVolHeader->FvLength - 1;
+    FvbDevice->DevicePath = (EFI_DEVICE_PATH_PROTOCOL *)FvMemmapDevicePath;
+  } else {
+    FV_PIWG_DEVICE_PATH *FvPiwgDevicePath;
+
+    FvPiwgDevicePath = AllocateCopyPool (sizeof (FV_PIWG_DEVICE_PATH),
+                         &mFvPIWGDevicePathTemplate);
+    CopyGuid (
+      &FvPiwgDevicePath->FvDevPath.FvName,
+      (GUID *)(UINTN)(BaseAddress + FwVolHeader->ExtHeaderOffset)
+      );
+    FvbDevice->DevicePath = (EFI_DEVICE_PATH_PROTOCOL *)FvPiwgDevicePath;
+  }
+
+  //
+  // Module type specific hook.
+  //
+  InstallProtocolInterfaces (FvbDevice);
+
+  MarkMemoryRangeForRuntimeAccess (BaseAddress, Length);
+
+  //
+  // Set several PCD values to point to flash
+  //
+  PcdSet64 (
+    PcdFlashNvStorageVariableBase64,
+    (UINTN) PcdGet32 (PcdPlatformFlashNvStorageVariableBase)
+    );
+  PcdSet32 (
+    PcdFlashNvStorageFtwWorkingBase,
+    PcdGet32 (PcdPlatformFlashNvStorageFtwWorkingBase)
+    );
+  PcdSet32 (
+    PcdFlashNvStorageFtwSpareBase,
+    PcdGet32 (PcdPlatformFlashNvStorageFtwSpareBase)
+    );
+
+  FwhInstance = (EFI_FW_VOL_INSTANCE *)
+    (
+      (UINTN) ((UINT8 *) FwhInstance) + FwVolHeader->HeaderLength +
+      (sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER))
+    );
+
+  //
+  // Module type specific hook.
+  //
+  InstallVirtualAddressChangeHandler ();
+  return EFI_SUCCESS;
+}
diff --git a/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockService.h b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockService.h
new file mode 100644
index 0000000..c6131be
--- /dev/null
+++ b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockService.h
@@ -0,0 +1,193 @@
+/**@file
+
+  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+  Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+  Module Name:
+
+    FwBlockService.h
+
+  Abstract:
+
+    Firmware volume block driver for Intel Firmware Hub (FWH) device
+
+**/
+
+#ifndef _FW_BLOCK_SERVICE_H
+#define _FW_BLOCK_SERVICE_H
+
+typedef struct {
+  UINTN                       FvBase;
+  UINTN                       NumOfBlocks;
+  EFI_FIRMWARE_VOLUME_HEADER  VolumeHeader;
+} EFI_FW_VOL_INSTANCE;
+
+typedef struct {
+  UINT32              NumFv;
+  EFI_FW_VOL_INSTANCE *FvInstance;
+} ESAL_FWB_GLOBAL;
+
+extern ESAL_FWB_GLOBAL *mFvbModuleGlobal;
+
+//
+// Fvb Protocol instance data
+//
+#define FVB_DEVICE_FROM_THIS(a) CR (a, EFI_FW_VOL_BLOCK_DEVICE, \
+                                  FwVolBlockInstance, FVB_DEVICE_SIGNATURE)
+
+#define FVB_EXTEND_DEVICE_FROM_THIS(a) CR (a, EFI_FW_VOL_BLOCK_DEVICE, \
+                                         FvbExtension, FVB_DEVICE_SIGNATURE)
+
+#define FVB_DEVICE_SIGNATURE            SIGNATURE_32 ('F', 'V', 'B', 'N')
+
+typedef struct {
+  MEDIA_FW_VOL_DEVICE_PATH  FvDevPath;
+  EFI_DEVICE_PATH_PROTOCOL  EndDevPath;
+} FV_PIWG_DEVICE_PATH;
+
+typedef struct {
+  MEMMAP_DEVICE_PATH          MemMapDevPath;
+  EFI_DEVICE_PATH_PROTOCOL    EndDevPath;
+} FV_MEMMAP_DEVICE_PATH;
+
+typedef struct {
+  UINTN                               Signature;
+  EFI_DEVICE_PATH_PROTOCOL            *DevicePath;
+  UINTN                               Instance;
+  EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  FwVolBlockInstance;
+} EFI_FW_VOL_BLOCK_DEVICE;
+
+EFI_STATUS
+GetFvbInfo (
+  IN  UINT64                            FvLength,
+  OUT EFI_FIRMWARE_VOLUME_HEADER        **FvbInfo
+  );
+
+EFI_STATUS
+FvbSetVolumeAttributes (
+  IN UINTN                                Instance,
+  IN OUT EFI_FVB_ATTRIBUTES_2             *Attributes,
+  IN ESAL_FWB_GLOBAL                      *Global
+  );
+
+EFI_STATUS
+FvbGetVolumeAttributes (
+  IN UINTN                                Instance,
+  OUT EFI_FVB_ATTRIBUTES_2                *Attributes,
+  IN ESAL_FWB_GLOBAL                      *Global
+  );
+
+EFI_STATUS
+FvbGetPhysicalAddress (
+  IN UINTN                                Instance,
+  OUT EFI_PHYSICAL_ADDRESS                *Address,
+  IN ESAL_FWB_GLOBAL                      *Global
+  );
+
+EFI_STATUS
+EFIAPI
+FvbInitialize (
+  IN EFI_HANDLE         ImageHandle,
+  IN EFI_SYSTEM_TABLE   *SystemTable
+  );
+
+
+VOID
+EFIAPI
+FvbClassAddressChangeEvent (
+  IN EFI_EVENT        Event,
+  IN VOID             *Context
+  );
+
+EFI_STATUS
+FvbGetLbaAddress (
+  IN  UINTN                               Instance,
+  IN  EFI_LBA                             Lba,
+  OUT UINTN                               *LbaAddress,
+  OUT UINTN                               *LbaLength,
+  OUT UINTN                               *NumOfBlocks,
+  IN  ESAL_FWB_GLOBAL                     *Global
+  );
+
+//
+// Protocol APIs
+//
+EFI_STATUS
+EFIAPI
+FvbProtocolGetAttributes (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  OUT EFI_FVB_ATTRIBUTES_2                              *Attributes
+  );
+
+EFI_STATUS
+EFIAPI
+FvbProtocolSetAttributes (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  IN OUT EFI_FVB_ATTRIBUTES_2                           *Attributes
+  );
+
+EFI_STATUS
+EFIAPI
+FvbProtocolGetPhysicalAddress (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  OUT EFI_PHYSICAL_ADDRESS                        *Address
+  );
+
+EFI_STATUS
+EFIAPI
+FvbProtocolGetBlockSize (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  IN CONST EFI_LBA                                     Lba,
+  OUT UINTN                                       *BlockSize,
+  OUT UINTN                                       *NumOfBlocks
+  );
+
+EFI_STATUS
+EFIAPI
+FvbProtocolRead (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  IN CONST EFI_LBA                                      Lba,
+  IN CONST UINTN                                        Offset,
+  IN OUT UINTN                                    *NumBytes,
+  IN UINT8                                        *Buffer
+  );
+
+EFI_STATUS
+EFIAPI
+FvbProtocolWrite (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL           *This,
+  IN       EFI_LBA                                      Lba,
+  IN       UINTN                                        Offset,
+  IN OUT   UINTN                                        *NumBytes,
+  IN       UINT8                                        *Buffer
+  );
+
+EFI_STATUS
+EFIAPI
+FvbProtocolEraseBlocks (
+  IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL    *This,
+  ...
+  );
+
+//
+// The following functions have different implementations dependent on the
+// module type chosen for building this driver.
+//
+VOID
+InstallProtocolInterfaces (
+  IN EFI_FW_VOL_BLOCK_DEVICE *FvbDevice
+  );
+
+VOID
+InstallVirtualAddressChangeHandler (
+  VOID
+  );
+#endif
diff --git a/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockServiceDxe.c b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockServiceDxe.c
new file mode 100644
index 0000000..7fea42e
--- /dev/null
+++ b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/FwBlockServiceDxe.c
@@ -0,0 +1,156 @@
+/**@file
+  Functions related to the Firmware Volume Block service whose
+  implementation is specific to the runtime DXE driver build.
+
+  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+  Copyright (C) 2015, Red Hat, Inc.
+  Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+**/
+
+#include <Guid/EventGroup.h>
+#include <Library/DebugLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/PcdLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeLib.h>
+#include <Protocol/DevicePath.h>
+#include <Protocol/FirmwareVolumeBlock.h>
+
+#include "FwBlockService.h"
+#include "RamFlash.h"
+
+VOID
+InstallProtocolInterfaces (
+  IN EFI_FW_VOL_BLOCK_DEVICE *FvbDevice
+  )
+{
+  EFI_STATUS                         Status;
+  EFI_HANDLE                         FwbHandle;
+  EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *OldFwbInterface;
+
+  //
+  // Find a handle with a matching device path that has supports FW Block
+  // protocol
+  //
+  Status = gBS->LocateDevicePath (&gEfiFirmwareVolumeBlockProtocolGuid,
+                  &FvbDevice->DevicePath, &FwbHandle);
+  if (EFI_ERROR (Status)) {
+    //
+    // LocateDevicePath fails so install a new interface and device path
+    //
+    FwbHandle = NULL;
+    DEBUG ((EFI_D_INFO, "Installing RAM FVB\n"));
+    Status = gBS->InstallMultipleProtocolInterfaces (
+                    &FwbHandle,
+                    &gEfiFirmwareVolumeBlockProtocolGuid,
+                    &FvbDevice->FwVolBlockInstance,
+                    &gEfiDevicePathProtocolGuid,
+                    FvbDevice->DevicePath,
+                    NULL
+                    );
+    ASSERT_EFI_ERROR (Status);
+  } else if (IsDevicePathEnd (FvbDevice->DevicePath)) {
+    //
+    // Device already exists, so reinstall the FVB protocol
+    //
+    Status = gBS->HandleProtocol (
+                    FwbHandle,
+                    &gEfiFirmwareVolumeBlockProtocolGuid,
+                    (VOID**)&OldFwbInterface
+                    );
+    ASSERT_EFI_ERROR (Status);
+
+    DEBUG ((EFI_D_INFO, "Reinstalling FVB for Ram flash region\n"));
+    Status = gBS->ReinstallProtocolInterface (
+                    FwbHandle,
+                    &gEfiFirmwareVolumeBlockProtocolGuid,
+                    OldFwbInterface,
+                    &FvbDevice->FwVolBlockInstance
+                    );
+    ASSERT_EFI_ERROR (Status);
+  } else {
+    //
+    // There was a FVB protocol on an End Device Path node
+    //
+    ASSERT (FALSE);
+  }
+}
+
+
+STATIC
+VOID
+EFIAPI
+FvbVirtualAddressChangeEvent (
+  IN EFI_EVENT        Event,
+  IN VOID             *Context
+  )
+/*++
+
+  Routine Description:
+
+    Fixup internal data so that EFI and SAL can be call in virtual mode.
+    Call the passed in Child Notify event and convert the mFvbModuleGlobal
+    date items to there virtual address.
+
+  Arguments:
+
+    (Standard EFI notify event - EFI_EVENT_NOTIFY)
+
+  Returns:
+
+    None
+
+--*/
+{
+  EFI_FW_VOL_INSTANCE *FwhInstance;
+  UINTN               Index;
+
+  FwhInstance = mFvbModuleGlobal->FvInstance;
+  EfiConvertPointer (0x0, (VOID **) &mFvbModuleGlobal->FvInstance);
+
+  //
+  // Convert the base address of all the instances
+  //
+  Index       = 0;
+  while (Index < mFvbModuleGlobal->NumFv) {
+    EfiConvertPointer (0x0, (VOID **) &FwhInstance->FvBase);
+    FwhInstance = (EFI_FW_VOL_INSTANCE *)
+      (
+        (UINTN) ((UINT8 *) FwhInstance) +
+        FwhInstance->VolumeHeader.HeaderLength +
+        (sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER))
+      );
+    Index++;
+  }
+
+  EfiConvertPointer (0x0, (VOID **) &mFvbModuleGlobal);
+  RamFlashConvertPointers ();
+}
+
+
+VOID
+InstallVirtualAddressChangeHandler (
+  VOID
+  )
+{
+  EFI_STATUS Status;
+  EFI_EVENT  VirtualAddressChangeEvent;
+
+  Status = gBS->CreateEventEx (
+                  EVT_NOTIFY_SIGNAL,
+                  TPL_NOTIFY,
+                  FvbVirtualAddressChangeEvent,
+                  NULL,
+                  &gEfiEventVirtualAddressChangeGuid,
+                  &VirtualAddressChangeEvent
+                  );
+  ASSERT_EFI_ERROR (Status);
+}
diff --git a/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlash.c b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlash.c
new file mode 100644
index 0000000..47d62c7
--- /dev/null
+++ b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlash.c
@@ -0,0 +1,151 @@
+/** @file
+  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PcdLib.h>
+
+#include "RamFlash.h"
+
+UINT8 *mFlashBase;
+
+STATIC UINTN       mFdBlockSize = 0;
+STATIC UINTN       mFdBlockCount = 0;
+
+STATIC
+volatile UINT8*
+RamFlashPtr (
+  IN        EFI_LBA                             Lba,
+  IN        UINTN                               Offset
+  )
+{
+  return mFlashBase + ((UINTN)Lba * mFdBlockSize) + Offset;
+}
+
+/**
+  Read from Ram Flash
+
+  @param[in] Lba      The starting logical block index to read from.
+  @param[in] Offset   Offset into the block at which to begin reading.
+  @param[in] NumBytes On input, indicates the requested read size. On
+                      output, indicates the actual number of bytes read
+  @param[in] Buffer   Pointer to the buffer to read into.
+
+**/
+EFI_STATUS
+RamFlashRead (
+  IN        EFI_LBA                              Lba,
+  IN        UINTN                                Offset,
+  IN        UINTN                                *NumBytes,
+  IN        UINT8                                *Buffer
+  )
+{
+  UINT8  *Ptr;
+
+  //
+  // Only write to the first 64k. We don't bother saving the FTW Spare
+  // block into the flash memory.
+  //
+  if (Lba >= mFdBlockCount) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Get flash address
+  //
+  Ptr = (UINT8*) RamFlashPtr (Lba, Offset);
+
+  CopyMem (Buffer, Ptr, *NumBytes);
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Write to Ram Flash
+
+  @param[in] Lba      The starting logical block index to write to.
+  @param[in] Offset   Offset into the block at which to begin writing.
+  @param[in] NumBytes On input, indicates the requested write size. On
+                      output, indicates the actual number of bytes written
+  @param[in] Buffer   Pointer to the data to write.
+
+**/
+EFI_STATUS
+RamFlashWrite (
+  IN        EFI_LBA                             Lba,
+  IN        UINTN                               Offset,
+  IN        UINTN                               *NumBytes,
+  IN        UINT8                               *Buffer
+  )
+{
+  volatile UINT8  *Ptr;
+  UINTN           Loop;
+
+  //
+  // Only write to the first 64k. We don't bother saving the FTW Spare
+  // block into the flash memory.
+  //
+  if (Lba >= mFdBlockCount) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Program flash
+  //
+  Ptr = RamFlashPtr (Lba, Offset);
+  for (Loop = 0; Loop < *NumBytes; Loop++) {
+    *Ptr = Buffer[Loop];
+    Ptr++;
+  }
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Erase a Ram Flash block
+
+  @param Lba    The logical block index to erase.
+
+**/
+EFI_STATUS
+RamFlashEraseBlock (
+  IN   EFI_LBA      Lba
+  )
+{
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  Initializes Ram flash memory support
+
+  @retval EFI_WRITE_PROTECTED   The Ram flash device is not present.
+  @retval EFI_SUCCESS           The Ram flash device is supported.
+
+**/
+EFI_STATUS
+RamFlashInitialize (
+  VOID
+  )
+{
+  mFlashBase = (UINT8*)(UINTN) PcdGet32 (PcdVariableFdBaseAddress);
+  mFdBlockSize = PcdGet32 (PcdVariableFdBlockSize);
+  ASSERT(PcdGet32 (PcdVariableFdSize) % mFdBlockSize == 0);
+  mFdBlockCount = PcdGet32 (PcdVariableFdSize) / mFdBlockSize;
+
+  return EFI_SUCCESS;
+}
+
diff --git a/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlash.h b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlash.h
new file mode 100644
index 0000000..4bd8cd2
--- /dev/null
+++ b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlash.h
@@ -0,0 +1,92 @@
+/** @file
+  Ram flash device for EFI variable
+
+  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#ifndef __RAM_FLASH_H__
+#define __RAM_FLASH_H__
+
+#include <Protocol/FirmwareVolumeBlock.h>
+
+extern UINT8 *mFlashBase;
+
+/**
+  Read from Ram Flash
+
+  @param[in] Lba      The starting logical block index to read from.
+  @param[in] Offset   Offset into the block at which to begin reading.
+  @param[in] NumBytes On input, indicates the requested read size. On
+                      output, indicates the actual number of bytes read
+  @param[in] Buffer   Pointer to the buffer to read into.
+
+**/
+EFI_STATUS
+RamFlashRead (
+  IN        EFI_LBA                              Lba,
+  IN        UINTN                                Offset,
+  IN        UINTN                                *NumBytes,
+  IN        UINT8                                *Buffer
+  );
+
+
+/**
+  Write to Ram Flash
+
+  @param[in] Lba      The starting logical block index to write to.
+  @param[in] Offset   Offset into the block at which to begin writing.
+  @param[in] NumBytes On input, indicates the requested write size. On
+                      output, indicates the actual number of bytes written
+  @param[in] Buffer   Pointer to the data to write.
+
+**/
+EFI_STATUS
+RamFlashWrite (
+  IN        EFI_LBA                              Lba,
+  IN        UINTN                                Offset,
+  IN        UINTN                                *NumBytes,
+  IN        UINT8                                *Buffer
+  );
+
+
+/**
+  Erase a Ram Flash block
+
+  @param Lba    The logical block index to erase.
+
+**/
+EFI_STATUS
+RamFlashEraseBlock (
+  IN   EFI_LBA      Lba
+  );
+
+
+/**
+  Initializes Ram flash memory support
+
+  @retval EFI_WRITE_PROTECTED   The Ram flash device is not present.
+  @retval EFI_SUCCESS           The Ram flash device is supported.
+
+**/
+EFI_STATUS
+RamFlashInitialize (
+  VOID
+  );
+
+
+VOID
+RamFlashConvertPointers (
+  VOID
+  );
+
+#endif
+
diff --git a/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlashDxe.c b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlashDxe.c
new file mode 100644
index 0000000..030a96f
--- /dev/null
+++ b/Platform/RiscV/SiFive/U500Pkg/Universal/Dxe/RamFvbServicesRuntimeDxe/RamFlashDxe.c
@@ -0,0 +1,26 @@
+/** @file
+  Ram flash device for EFI variable
+
+  Copyright (c) 2019, Hewlett Packard Enterprise Development LP. All rights reserved.<BR>
+
+  This program and the accompanying materials are licensed and made available
+  under the terms and conditions of the BSD License which accompanies this
+  distribution.  The full text of the license may be found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Library/UefiRuntimeLib.h>
+
+#include "RamFlash.h"
+
+VOID
+RamFlashConvertPointers (
+  VOID
+  )
+{
+  EfiConvertPointer (0x0, (VOID **) &mFlashBase);
+}
--
2.7.4


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