StandaloneMmPkg/Library/VariableMmDependency/VariableMmDependency.c

/** @file
  Runtime DXE part corresponding to StandaloneMM variable module.

This module installs variable arch protocol and variable write arch protocol
to StandaloneMM runtime variable service.

Copyright (c) 2019 - 2021, Arm Ltd. All rights reserved.

SPDX-License-Identifier: BSD-2-Clause-Patent

**/

#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>

/**
  The constructor function installs variable arch protocol and variable
  write arch protocol to StandaloneMM runtime variable service

  @param  ImageHandle   The firmware allocated handle for the EFI image.
  @param  SystemTable   A pointer to the Management mode System Table.

  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.

**/
EFI_STATUS
EFIAPI
VariableMmDependencyLibConstructor (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS  Status;
  EFI_HANDLE  Handle;

  Handle = NULL;
  Status = gBS->InstallMultipleProtocolInterfaces (
                  &Handle,
                  &gEfiSmmVariableProtocolGuid,
                  NULL,
                  &gSmmVariableWriteGuid,
                  NULL,
                  NULL
                  );
  ASSERT_EFI_ERROR (Status);
  return EFI_SUCCESS;
}