MdePkg/Library/BaseLib/Arm/GetInterruptsState.asm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; GetInterruptState() function for ARM
   4 ;
   5 ; Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   6 ; Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   7 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   8 ;
   9 ;------------------------------------------------------------------------------
  10
  11     EXPORT GetInterruptState
  12
  13     AREA Interrupt_enable, CODE, READONLY
  14
  15 ;/**
  16 ;  Retrieves the current CPU interrupt state.
  17 ;
  18 ;  Returns TRUE is interrupts are currently enabled. Otherwise
  19 ;  returns FALSE.
  20 ;
  21 ;  @retval TRUE  CPU interrupts are enabled.
  22 ;  @retval FALSE CPU interrupts are disabled.
  23 ;
  24 ;**/
  25 ;
  26 ;BOOLEAN
  27 ;EFIAPI
  28 ;GetInterruptState (
  29 ;  VOID
  30 ; );
  31 ;
  32 GetInterruptState
  33     MRS     R0, CPSR
  34     TST     R0, #0x80                ;Check if IRQ is enabled.
  35     MOVEQ   R0, #1
  36     MOVNE   R0, #0
  37     BX      LR
  38
  39     END