ArmPkg/Drivers/ArmCpuLib/ArmCortexA5xLib/AArch64/ArmCortexA5xHelper.S

   1 #------------------------------------------------------------------------------
   2 #
   3 # Copyright (c) 2013 - 2014, ARM Limited. All rights reserved.
   4 #
   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 <AsmMacroIoLibV8.h>
  16
  17 .text
  18 .align 3
  19 GCC_ASM_EXPORT (ArmReadCpuExCr)
  20 GCC_ASM_EXPORT (ArmWriteCpuExCr)
  21
  22 ASM_PFX(ArmReadCpuExCr):
  23   mrs   x0, S3_1_c15_c2_1
  24   ret
  25
  26 ASM_PFX(ArmWriteCpuExCr):
  27   msr   S3_1_c15_c2_1, x0
  28   dsb   sy
  29   isb
  30   ret
  31
  32 ASM_FUNCTION_REMOVE_IF_UNREFERENCED