MdePkg/Library/BaseLib/X86SpeculationBarrier.c

   1 /** @file
   2   SpeculationBarrier() function for IA32 and x64.
   3
   4   Copyright (C) 2018, Intel Corporation. All rights reserved.<BR>
   5
   6   This program and the accompanying materials are licensed and made available
   7   under the terms and conditions of the BSD License which accompanies this
   8   distribution.  The full text of the license may be found at
   9   http://opensource.org/licenses/bsd-license.php.
  10
  11   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  12   WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13
  14 **/
  15
  16 #include <Library/BaseLib.h>
  17
  18 /**
  19   Uses as a barrier to stop speculative execution.
  20
  21   Ensures that no later instruction will execute speculatively, until all prior
  22   instructions have completed.
  23
  24 **/
  25 VOID
  26 EFIAPI
  27 SpeculationBarrier (
  28   VOID
  29   )
  30 {
  31   AsmLfence ();
  32 }