MdePkg/Library/BaseLib/AArch64/GetInterruptsState.asm

;------------------------------------------------------------------------------
;
; 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>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
;------------------------------------------------------------------------------

  EXPORT GetInterruptState
  AREA BaseLib_LowLevel, CODE, READONLY

DAIF_RD_IRQ_BIT     EQU     (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
; );
;
GetInterruptState
    mrs    x0, daif
    mov    w0, wzr
    tst    x0, #DAIF_RD_IRQ_BIT   // Check IRQ mask; set Z=1 if clear/unmasked
    bne    exit                   // if Z=1 (eq) return 1, else 0
    mov    w0, #1
exit
    ret

  END