MdePkg/Library/BaseLib: Enable VS2017/ARM64 builds

[mirror_edk2.git] / MdePkg / Library / BaseLib / AArch64 / GetInterruptsState.asm

;------------------------------------------------------------------------------\r
;\r
; GetInterruptState() function for AArch64\r
;\r
; Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r
; Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
; Portions copyright (c) 2011 - 2013, ARM Ltd. All rights reserved.<BR>\r
; This program and the accompanying materials\r
; are licensed and made available under the terms and conditions of the BSD License\r
; which accompanies this distribution.  The full text of the license may be found at\r
; http://opensource.org/licenses/bsd-license.php.\r
;\r
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
;\r
;------------------------------------------------------------------------------\r
\r
  EXPORT GetInterruptState\r
  AREA BaseLib_LowLevel, CODE, READONLY\r
\r
DAIF_RD_IRQ_BIT     EQU     (1 << 7)\r
\r
;/**\r
;  Retrieves the current CPU interrupt state.\r
;\r
;  Returns TRUE is interrupts are currently enabled. Otherwise\r
;  returns FALSE.\r
;\r
;  @retval TRUE  CPU interrupts are enabled.\r
;  @retval FALSE CPU interrupts are disabled.\r
;\r
;**/\r
;\r
;BOOLEAN\r
;EFIAPI\r
;GetInterruptState (\r
;  VOID\r
; );\r
;\r
GetInterruptState\r
    mrs    x0, daif\r
    mov    w0, wzr\r
    tst    x0, #DAIF_RD_IRQ_BIT   // Check IRQ mask; set Z=1 if clear/unmasked\r
    bne    exit                   // if Z=1 (eq) return 1, else 0\r
    mov    w0, #1\r
exit\r
    ret\r
\r
  END\r