NvVarsFileLib.c

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#include "NvVarsFileLib.h"
#include <Library/DebugLib.h>
#include <Library/NvVarsFileLib.h>
 
EFI_HANDLE  mNvVarsFileLibFsHandle = NULL;
 
EFI_STATUS
EFIAPI
ConnectNvVarsToFileSystem (
  IN EFI_HANDLE  FsHandle
  )
{
  EFI_STATUS  Status;
 
  if (FeaturePcdGet (PcdSecureBootSupported) ||
      FeaturePcdGet (PcdBootRestrictToFirmware))
  {
    return EFI_UNSUPPORTED;
  }
 
  //
  // We might fail to load the variable, since the file system initially
  // will not have the NvVars file.
  //
  LoadNvVarsFromFs (FsHandle);
 
  //
  // We must be able to save the variables successfully to the file system
  // to have connected successfully.
  //
  Status = SaveNvVarsToFs (FsHandle);
  if (!EFI_ERROR (Status)) {
    mNvVarsFileLibFsHandle = FsHandle;
  }
 
  return Status;
}
 
EFI_STATUS
EFIAPI
UpdateNvVarsOnFileSystem (
  )
{
  if (mNvVarsFileLibFsHandle == NULL) {
    //
    // A file system had not been connected to the library.
    //
    return EFI_NOT_STARTED;
  } else {
    return SaveNvVarsToFs (mNvVarsFileLibFsHandle);
  }
}