diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/AArch64/GetInterruptsState.S')
| -rw-r--r-- | MdePkg/Library/BaseLib/AArch64/GetInterruptsState.S | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.S b/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.S new file mode 100644 index 000000000000..1818c62560fe --- /dev/null +++ b/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.S @@ -0,0 +1,45 @@ +#------------------------------------------------------------------------------ +# +# 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> +# 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) + +.set DAIF_RD_IRQ_BIT, (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 +# ); +# +ASM_PFX(GetInterruptState): + mrs x0, daif + tst x0, #DAIF_RD_IRQ_BIT // Check IRQ mask; set Z=1 if clear/unmasked + cset w0, eq // if Z=1 (eq) return 1, else 0 + ret |