MdePkg/Library/BaseRngLib/AArch64/ArmReadIdIsar0.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; ArmReadIdIsar0() for AArch64
   4 ;
   5 ; Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
   6 ;
   7 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   8 ;
   9 ;------------------------------------------------------------------------------
  10
  11   EXPORT ArmReadIdIsar0
  12   AREA BaseLib_LowLevel, CODE, READONLY
  13
  14 ;/**
  15 ;  Reads the ID_AA64ISAR0 Register.
  16 ;
  17 ; @return The contents of the ID_AA64ISAR0 register.
  18 ;
  19 ;**/
  20 ;UINT64
  21 ;EFIAPI
  22 ;ArmReadIdIsar0 (
  23 ;  VOID
  24 ;  );
  25 ;
  26 ArmReadIdIsar0
  27   mrs  x0, id_aa64isar0_el1 // Read ID_AA64ISAR0 Register
  28   ret
  29
  30   END