MdePkg/Library/BaseLib/AArch64/SpeculationBarrier.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; SpeculationBarrier() for AArch64
   4 ;
   5 ; Copyright (c) 2019, Linaro Ltd. All rights reserved.
   6 ;
   7 ; This program and the accompanying materials
   8 ; are licensed and made available under the terms and conditions of the BSD License
   9 ; which accompanies this distribution.  The full text of the license may be found at
  10 ; http://opensource.org/licenses/bsd-license.php.
  11 ;
  12 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 ;
  15 ;------------------------------------------------------------------------------
  16
  17   EXPORT SpeculationBarrier
  18   AREA BaseLib_LowLevel, CODE, READONLY
  19
  20 ;/**
  21 ;  Uses as a barrier to stop speculative execution.
  22 ;
  23 ;  Ensures that no later instruction will execute speculatively, until all prior
  24 ;  instructions have completed.
  25 ;
  26 ;**/
  27 ;VOID
  28 ;EFIAPI
  29 ;SpeculationBarrier (
  30 ;  VOID
  31 ;  );
  32 ;
  33 SpeculationBarrier
  34     dsb   sy
  35     isb
  36     ret
  37
  38   END