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 # SPDX-License-Identifier: BSD-2-Clause-Patent
   8 #
   9 #------------------------------------------------------------------------------
  10
  11 .text
  12 .p2align 2
  13 GCC_ASM_EXPORT (GetInterruptState)
  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 ASM_PFX(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