MdePkg/Library/BaseLib/AArch64/GetInterruptsState.S File Reference


Detailed Description

#------------------------------------------------------------------------------
#
# GetInterruptState() function for AArch64
#
# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.

# Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.

# Portions copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.

# 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)

#/**
# Retrieves the current CPU interrupt state.
#
# Returns TRUE is interrupts are currently enabled. Otherwise
# returns FALSE.
#
#
Return values:
TRUE CPU interrupts are enabled.
#
FALSE CPU interrupts are disabled.
#
#
BOOLEAN
EFIAPI
GetInterruptState (
# VOID
# );
#
ASM_PFX(GetInterruptState):
mrs x0, daif
tst x0, #2 // Check if IRQ is enabled. Enabled if 0.
mov w0, #0
mov w1, #1
csel w0, w1, w0, ne
ret


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