1#------------------------------------------------------------------------------
2#
3# GetInterruptState() function for AArch64
4#
5# Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>
6# Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
7# Portions copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>
8# This program and the accompanying materials
9# are licensed and made available under the terms and conditions of the BSD License
10# which accompanies this distribution.  The full text of the license may be found at
11# http://opensource.org/licenses/bsd-license.php.
12#
13# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
14# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
15#
16#------------------------------------------------------------------------------
17
18.text
19.p2align 2
20GCC_ASM_EXPORT(GetInterruptState)
21
22.set DAIF_RD_IRQ_BIT,   (1 << 7)
23
24#/**
25#  Retrieves the current CPU interrupt state.
26#
27#  Returns TRUE is interrupts are currently enabled. Otherwise
28#  returns FALSE.
29#
30#  @retval TRUE  CPU interrupts are enabled.
31#  @retval FALSE CPU interrupts are disabled.
32#
33#**/
34#
35#BOOLEAN
36#EFIAPI
37#GetInterruptState (
38#  VOID
39# );
40#
41ASM_PFX(GetInterruptState):
42    mrs    x0, daif
43    tst    x0, #DAIF_RD_IRQ_BIT   // Check IRQ mask; set Z=1 if clear/unmasked
44    cset   w0, eq                 // if Z=1 (eq) return 1, else 0
45    ret
46