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 ; This program and the accompanying materials
   8 ; are licensed and made available under the terms and conditions of the BSD License
   9 ; which accompanies this distribution.  The full text of the license may be found at
  10 ; http://opensource.org/licenses/bsd-license.php.
  11 ;
  12 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14 ;
  15 ;------------------------------------------------------------------------------
  16
  17     EXPORT GetInterruptState
  18
  19     AREA Interrupt_enable, CODE, READONLY
  20
  21 ;/**
  22 ;  Retrieves the current CPU interrupt state.
  23 ;
  24 ;  Returns TRUE is interrupts are currently enabled. Otherwise
  25 ;  returns FALSE.
  26 ;
  27 ;  @retval TRUE  CPU interrupts are enabled.
  28 ;  @retval FALSE CPU interrupts are disabled.
  29 ;
  30 ;**/
  31 ;
  32 ;BOOLEAN
  33 ;EFIAPI
  34 ;GetInterruptState (
  35 ;  VOID
  36 ; );
  37 ;
  38 GetInterruptState
  39     MRS     R0, CPSR
  40     TST     R0, #0x80                ;Check if IRQ is enabled.
  41     MOVEQ   R0, #1
  42     MOVNE   R0, #0
  43     BX      LR
  44
  45     END