MdeModulePkg/Universal/Variable/RuntimeDxe/SpeculationBarrierSmm.c

   1 /** @file
   2   Barrier to stop speculative execution (SMM version).
   3
   4 Copyright (c) 2018, 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 <Library/BaseLib.h>
  16 #include "Variable.h"
  17
  18 /**
  19   This service is consumed by the variable modules to place a barrier to stop
  20   speculative execution.
  21
  22   Ensures that no later instruction will execute speculatively, until all prior
  23   instructions have completed.
  24
  25 **/
  26 VOID
  27 VariableSpeculationBarrier (
  28   VOID
  29   )
  30 {
  31   SpeculationBarrier ();
  32 }