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| author | Andreas Sandberg <andreas.sandberg@arm.com> | 2021-03-09 16:45:10 +0000 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2021-05-27 10:08:32 +0000 |
| commit | e1999b264f1f9d7230edf2448f757c73da567832 (patch) | |
| tree | 85f9a448b867a23c0ca9e6d1bd7af5c2f3d58922 /ArmPkg/Drivers/ArmGic | |
| parent | cfa6ffb113f2c0d922034cc77c0d6c52eea05497 (diff) | |
| download | edk2-e1999b264f1f9d7230edf2448f757c73da567832.tar.gz edk2-e1999b264f1f9d7230edf2448f757c73da567832.tar.bz2 edk2-e1999b264f1f9d7230edf2448f757c73da567832.zip | |
ArmPkg/ArmGic: Fix maximum number of interrupts in GICv3edk2-stable202105
Bugzilla: 3415 (https://bugzilla.tianocore.org/show_bug.cgi?id=3415)
The GICv3 architecture supports up to 1020 ordinary interrupt
lines. The actual number of interrupts supported is described by the
ITLinesNumber field in the GICD_TYPER register. The total number of
implemented registers is normally calculated as
32*(ITLinesNumber+1). However, maximum value (0x1f) is a special case
since that would indicate that 1024 interrupts are implemented.
Add handling for this special case in ArmGicGetMaxNumInterrupts.
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Diffstat (limited to 'ArmPkg/Drivers/ArmGic')
| -rw-r--r-- | ArmPkg/Drivers/ArmGic/ArmGicLib.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/ArmPkg/Drivers/ArmGic/ArmGicLib.c b/ArmPkg/Drivers/ArmGic/ArmGicLib.c index 6b01c88206..bd4b5edb90 100644 --- a/ArmPkg/Drivers/ArmGic/ArmGicLib.c +++ b/ArmPkg/Drivers/ArmGic/ArmGicLib.c @@ -1,6 +1,6 @@ /** @file
*
-* Copyright (c) 2011-2018, ARM Limited. All rights reserved.
+* Copyright (c) 2011-2021, Arm Limited. All rights reserved.
*
* SPDX-License-Identifier: BSD-2-Clause-Patent
*
@@ -120,7 +120,14 @@ ArmGicGetMaxNumInterrupts ( IN INTN GicDistributorBase
)
{
- return 32 * ((MmioRead32 (GicDistributorBase + ARM_GIC_ICDICTR) & 0x1F) + 1);
+ UINTN ItLines;
+
+ ItLines = MmioRead32 (GicDistributorBase + ARM_GIC_ICDICTR) & 0x1F;
+
+ //
+ // Interrupt ID 1020-1023 are reserved.
+ //
+ return (ItLines == 0x1f) ? 1020 : 32 * (ItLines + 1);
}
VOID
|