MdePkg/Library/BaseLib/Arm/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
  13     AREA MemoryBarriers, CODE, READONLY
  14
  15 ;/**
  16 ;  Uses as a barrier to stop speculative execution.
  17 ;
  18 ;  Ensures that no later instruction will execute speculatively, until all prior
  19 ;  instructions have completed.
  20 ;
  21 ;**/
  22 ;VOID
  23 ;EFIAPI
  24 ;SpeculationBarrier (
  25 ;  VOID
  26 ;  );
  27 ;
  28 SpeculationBarrier
  29     dsb
  30     isb
  31     bx    lr
  32
  33   END