audk/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.S

#------------------------------------------------------------------------------
#
# GetInterruptState() function for AArch64
#
# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
# Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
# Portions copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>
# This program and the accompanying materials
# are licensed and made available under the terms and conditions of the BSD License
# which accompanies this distribution.  The full text of the license may be found at
# http://opensource.org/licenses/bsd-license.php.
#
# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
#
#------------------------------------------------------------------------------

.text
.p2align 2
GCC_ASM_EXPORT(GetInterruptState)

.set DAIF_RD_IRQ_BIT,   (1 << 7)

#/**
#  Retrieves the current CPU interrupt state.
#
#  Returns TRUE is interrupts are currently enabled. Otherwise
#  returns FALSE.
#
#  @retval TRUE  CPU interrupts are enabled.
#  @retval FALSE CPU interrupts are disabled.
#
#**/
#
#BOOLEAN
#EFIAPI
#GetInterruptState (
#  VOID
# );
#
ASM_PFX(GetInterruptState):
    mrs    x0, daif
    tst    x0, #DAIF_RD_IRQ_BIT   // Check IRQ mask; set Z=1 if clear/unmasked
    cset   w0, eq                 // if Z=1 (eq) return 1, else 0
    ret