StandaloneMmPkg/Library/VariableMmDependency/VariableMmDependency.c

   1 /** @file
   2   Runtime DXE part corresponding to StanaloneMM variable module.
   3
   4 This module installs variable arch protocol and variable write arch protocol
   5 to StandaloneMM runtime variable service.
   6
   7 Copyright (c) 2019, ARM Ltd. All rights reserved.
   8
   9 SPDX-License-Identifier: BSD-2-Clause-Patent
  10
  11 **/
  12
  13 #include <Library/DebugLib.h>
  14 #include <Library/UefiBootServicesTableLib.h>
  15
  16 /**
  17   The constructor function installs variable arch protocol and variable
  18   write arch protocol to StandaloneMM runtime variable service
  19
  20   @param  ImageHandle   The firmware allocated handle for the EFI image.
  21   @param  SystemTable   A pointer to the Management mode System Table.
  22
  23   @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
  24
  25 **/
  26 EFI_STATUS
  27 EFIAPI
  28 VariableMmDependencyLibConstructor (
  29   IN EFI_HANDLE                           ImageHandle,
  30   IN EFI_SYSTEM_TABLE                     *SystemTable
  31   )
  32 {
  33   EFI_STATUS            Status;
  34   EFI_HANDLE            Handle;
  35
  36   Handle = NULL;
  37   Status = gBS->InstallMultipleProtocolInterfaces (
  38                   &Handle,
  39                   &gEfiSmmVariableProtocolGuid,
  40                   NULL,
  41                   &gSmmVariableWriteGuid,
  42                   NULL,
  43                   NULL
  44                   );
  45   ASSERT_EFI_ERROR (Status);
  46   return EFI_SUCCESS;
  47 }