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 20 GCC_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 # 41 ASM_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
