Implement NvVarsFileLib to save and restore non-volatile variables using a file.

This library provides an interface where variables can be saved and restored
using a file in a file system accessible to the firmware.  It is expected
that a platform BDS library will use this library.  The platform BDS
implementation can decide which devices to connect and then to attempt to use
for saving and restoring NV variables.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9272 6f19259b-4bc3-4df7-8a09-765794883524

OvmfPkg/Library/NvVarsFileLib/NvVarsFileLib.inf

@@ -0,0 +1,60 @@
+#/** @file
+#  NvVarsFileLib
+#
+#  This kibrary saves and restores non-volatile variables in a
+#  file within a file system.
+#
+#  Copyright (c) 2006 - 2009, Intel Corporation
+#
+#  All rights reserved. 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                      = NvVarsFileLib
+  FILE_GUID                      = 9172fe8b-9a36-40f8-bba5-5e57a44390bd
+  MODULE_TYPE                    = UEFI_DRIVER
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = NvVarsFileLib|DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SAL_DRIVER UEFI_DRIVER
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+#  VALID_ARCHITECTURES           = IA32 X64 IPF EBC
+#
+
+[Sources.common]
+  FsAccess.c
+  NvVarsFileLib.c
+  VarBuffer.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  MdeModulePkg/MdeModulePkg.dec
+  OvmfPkg/OvmfPkg.dec
+  ShellPkg/ShellPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  BaseMemoryLib
+  DebugLib
+  FileHandleLib
+  MemoryAllocationLib
+
+[Protocols]
+  gEfiSimpleFileSystemProtocolGuid              ## CONSUMES
+
+
+[Guids]
+  gEfiFileInfoGuid
+
+[Depex]
+  gEfiVariableWriteArchProtocolGuid
+