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 0000000000..5a971f5612 --- /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
+ASM_GLOBAL ASM_PFX(GetInterruptState)
+
+#/**
+# 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, #2 // Check if IRQ is enabled. Enabled if 0.
+ mov w0, #0
+ mov w1, #1
+ csel w0, w1, w0, ne
+ ret
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