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Make the GIC interrupt controller support a subgroup of the generic interrupt
controller support.
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In addtion to 1023, the GICC_IAR register may return 1022 as a special value.
Simply check for a valid interrupt vector for the dispatching.
Check the GICC_IAR again after the dispatch to quickly process a next interrupt
without having to go through the interrupt prologue and epiloge.
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Fixing the debug mask flag broke nested interrupts. This restores that
functionality.
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The existing code is functional but inccorrect and blindly modifies the
other masking bits. It is important to preserve those other bits since
they control masking of important system events.
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Fixes:
bsps/shared/dev/irq/arm-gicv2.c:53:6: warning: no previous prototype for
'bsp_interrupt_dispatch' [-Wmissing-prototypes]
Close #4227.
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This avoids a function call overhead in the interrupt dispatching.
Update #4202.
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