MdePkg/Library/BaseLib/Arm/GetInterruptsState.S

   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 .text
  18 .p2align 2
  19 GCC_ASM_EXPORT (GetInterruptState)
  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 ASM_PFX(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