1 /** @file 2 Save Non-Volatile Variables to a file system. 3 4 Copyright (c) 2009, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 13 **/ 14 15 #include "NvVarsFileLib.h" 16 #include <Library/DebugLib.h> 17 #include <Library/NvVarsFileLib.h> 18 19 EFI_HANDLE mNvVarsFileLibFsHandle = NULL; 20 21 22 /** 23 Attempts to connect the NvVarsFileLib to the specified file system. 24 25 @param[in] FsHandle - Handle for a gEfiSimpleFileSystemProtocolGuid instance 26 27 @return The EFI_STATUS while attempting to connect the NvVarsFileLib 28 to the file system instance. 29 @retval EFI_SUCCESS - The given file system was connected successfully 30 31 **/ 32 EFI_STATUS 33 EFIAPI ConnectNvVarsToFileSystem(IN EFI_HANDLE FsHandle)34ConnectNvVarsToFileSystem ( 35 IN EFI_HANDLE FsHandle 36 ) 37 { 38 EFI_STATUS Status; 39 40 // 41 // We might fail to load the variable, since the file system initially 42 // will not have the NvVars file. 43 // 44 LoadNvVarsFromFs (FsHandle); 45 46 // 47 // We must be able to save the variables successfully to the file system 48 // to have connected successfully. 49 // 50 Status = SaveNvVarsToFs (FsHandle); 51 if (!EFI_ERROR (Status)) { 52 mNvVarsFileLibFsHandle = FsHandle; 53 } 54 55 return Status; 56 } 57 58 59 /** 60 Update non-volatile variables stored on the file system. 61 62 @return The EFI_STATUS while attempting to update the variable on 63 the connected file system. 64 @retval EFI_SUCCESS - The non-volatile variables were saved to the disk 65 @retval EFI_NOT_STARTED - A file system has not been connected 66 67 **/ 68 EFI_STATUS 69 EFIAPI UpdateNvVarsOnFileSystem()70UpdateNvVarsOnFileSystem ( 71 ) 72 { 73 if (mNvVarsFileLibFsHandle == NULL) { 74 // 75 // A file system had not been connected to the library. 76 // 77 return EFI_NOT_STARTED; 78 } else { 79 return SaveNvVarsToFs (mNvVarsFileLibFsHandle); 80 } 81 } 82 83 84