OvmfPkg/RiscVVirt: Add VirtNorFlashPlatformLib library

Qemu NOR flash driver needs this library. Add this
library for RISC-V leveraged from SbsaQemu.

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/Library/VirtNorFlashPlatformLib/VirtNorFlashStaticLib.c

@@ -0,0 +1,40 @@
+/** @file
+
+ Copyright (c) 2019, Linaro Ltd. All rights reserved
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+ **/
+
+#include <Base.h>
+#include <PiDxe.h>
+#include <Library/VirtNorFlashPlatformLib.h>
+
+#define QEMU_NOR_BLOCK_SIZE  SIZE_256KB
+
+EFI_STATUS
+VirtNorFlashPlatformInitialization (
+  VOID
+  )
+{
+  return EFI_SUCCESS;
+}
+
+VIRT_NOR_FLASH_DESCRIPTION  mNorFlashDevice =
+{
+  FixedPcdGet32 (PcdOvmfFdBaseAddress),
+  FixedPcdGet64 (PcdFlashNvStorageVariableBase),
+  FixedPcdGet32 (PcdOvmfFirmwareFdSize),
+  QEMU_NOR_BLOCK_SIZE
+};
+
+EFI_STATUS
+VirtNorFlashPlatformGetDevices (
+  OUT VIRT_NOR_FLASH_DESCRIPTION  **NorFlashDescriptions,
+  OUT UINT32                      *Count
+  )
+{
+  *NorFlashDescriptions = &mNorFlashDevice;
+  *Count                = 1;
+  return EFI_SUCCESS;
+}