MdePkg/Library/BaseLib/AArch64/SpeculationBarrier.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; SpeculationBarrier() for AArch64
   4 ;
   5 ; Copyright (c) 2019, Linaro Ltd. All rights reserved.
   6 ;
   7 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   8 ;
   9 ;------------------------------------------------------------------------------
  10
  11   EXPORT SpeculationBarrier
  12   AREA BaseLib_LowLevel, CODE, READONLY
  13
  14 ;/**
  15 ;  Uses as a barrier to stop speculative execution.
  16 ;
  17 ;  Ensures that no later instruction will execute speculatively, until all prior
  18 ;  instructions have completed.
  19 ;
  20 ;**/
  21 ;VOID
  22 ;EFIAPI
  23 ;SpeculationBarrier (
  24 ;  VOID
  25 ;  );
  26 ;
  27 SpeculationBarrier
  28     dsb   sy
  29     isb
  30     ret
  31
  32   END