UefiCpuPkg: Move AsmRelocateApLoopStart from Mpfuncs.nasm to AmdSev.nasm

[mirror_edk2.git] / OvmfPkg / Library / NvVarsFileLib / NvVarsFileLib.c

/** @file\r
  Save Non-Volatile Variables to a file system.\r
\r
  Copyright (c) 2009, Intel Corporation. All rights reserved.<BR>\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include "NvVarsFileLib.h"\r
#include <Library/DebugLib.h>\r
#include <Library/NvVarsFileLib.h>\r
\r
EFI_HANDLE  mNvVarsFileLibFsHandle = NULL;\r
\r
/**\r
  Attempts to connect the NvVarsFileLib to the specified file system.\r
\r
  @param[in]  FsHandle - Handle for a gEfiSimpleFileSystemProtocolGuid instance\r
\r
  @return     The EFI_STATUS while attempting to connect the NvVarsFileLib\r
              to the file system instance.\r
  @retval     EFI_SUCCESS - The given file system was connected successfully\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
ConnectNvVarsToFileSystem (\r
  IN EFI_HANDLE  FsHandle\r
  )\r
{\r
 #ifdef SECURE_BOOT_FEATURE_ENABLED\r
\r
  return EFI_UNSUPPORTED;\r
\r
 #else\r
\r
  EFI_STATUS  Status;\r
\r
  //\r
  // We might fail to load the variable, since the file system initially\r
  // will not have the NvVars file.\r
  //\r
  LoadNvVarsFromFs (FsHandle);\r
\r
  //\r
  // We must be able to save the variables successfully to the file system\r
  // to have connected successfully.\r
  //\r
  Status = SaveNvVarsToFs (FsHandle);\r
  if (!EFI_ERROR (Status)) {\r
    mNvVarsFileLibFsHandle = FsHandle;\r
  }\r
\r
  return Status;\r
 #endif\r
}\r
\r
/**\r
  Update non-volatile variables stored on the file system.\r
\r
  @return     The EFI_STATUS while attempting to update the variable on\r
              the connected file system.\r
  @retval     EFI_SUCCESS - The non-volatile variables were saved to the disk\r
  @retval     EFI_NOT_STARTED - A file system has not been connected\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
UpdateNvVarsOnFileSystem (\r
  )\r
{\r
  if (mNvVarsFileLibFsHandle == NULL) {\r
    //\r
    // A file system had not been connected to the library.\r
    //\r
    return EFI_NOT_STARTED;\r
  } else {\r
    return SaveNvVarsToFs (mNvVarsFileLibFsHandle);\r
  }\r
}\r