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ArmPkg/ArmGicLib: Add ArmGicSetInterruptPriority() helper function

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According to ARM IHI 0069F, section 11.9.18 GICD_IPRIORITYR<n>,
Interrupt Priority Registers, n = 0 - 254, when affinity routing is
enabled for the Security state of an interrupt, GICR_IPRIORITYR<n>
is used instead of GICD_IPRIORITYR<n> where n = 0 to 7 (that is, for
SGIs and PPIs).

As setting interrupt priority for SGIs and PPIs are handled using
difference registers depends on the mode, this patch instroduces
ArmGicSetInterruptPriority() helper function to handle the discrepancy.

Cc: Leif Lindholm <leif@nuviainc.com>
Signed-off-by: Quan Nguyen <quan@os.amperecomputing.com>
Reviewed-off-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
This commit is contained in:
Quan Nguyen 2020-12-16 20:25:20 +07:00 committed by mergify[bot]
parent e2bfd172e4
commit 0d49b82e4f
2 changed files with 53 additions and 0 deletions
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44
ArmPkg/Drivers/ArmGic/ArmGicLib.c
View File

@ -199,6 +199,50 @@ ArmGicEndOfInterrupt (
}
}
VOID
EFIAPI
ArmGicSetInterruptPriority (
IN UINTN GicDistributorBase,
IN UINTN GicRedistributorBase,
IN UINTN Source,
IN UINTN Priority
)
{
UINT32 RegOffset;
UINTN RegShift;
ARM_GIC_ARCH_REVISION Revision;
UINTN GicCpuRedistributorBase;
// Calculate register offset and bit position
RegOffset = Source / 4;
RegShift = (Source % 4) * 8;
Revision = ArmGicGetSupportedArchRevision ();
if ((Revision == ARM_GIC_ARCH_REVISION_2) ||
FeaturePcdGet (PcdArmGicV3WithV2Legacy) ||
SourceIsSpi (Source)) {
MmioAndThenOr32 (
GicDistributorBase + ARM_GIC_ICDIPR + (4 * RegOffset),
~(0xff << RegShift),
Priority << RegShift
);
} else {
GicCpuRedistributorBase = GicGetCpuRedistributorBase (
GicRedistributorBase,
Revision
);
if (GicCpuRedistributorBase == 0) {
return;
}
MmioAndThenOr32 (
GicCpuRedistributorBase + ARM_GIC_ICDIPR + (4 * RegOffset),
~(0xff << RegShift),
Priority << RegShift
);
}
}
VOID
EFIAPI
ArmGicEnableInterrupt (

9
ArmPkg/Include/Library/ArmGicLib.h
View File

@ -208,6 +208,15 @@ ArmGicSetPriorityMask (
IN INTN PriorityMask
);
VOID
EFIAPI
ArmGicSetInterruptPriority (
IN UINTN GicDistributorBase,
IN UINTN GicRedistributorBase,
IN UINTN Source,
IN UINTN Priority
);
VOID
EFIAPI
ArmGicEnableInterrupt (