diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.asm | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.asm')
| -rw-r--r-- | roms/edk2/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.asm | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.asm b/roms/edk2/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.asm new file mode 100644 index 000000000..b169db45d --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseLib/AArch64/GetInterruptsState.asm @@ -0,0 +1,43 @@ +;------------------------------------------------------------------------------
+;
+; 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
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