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arm64: isr_wrapper: ignore Special INTIDs between 1020..1023

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Referring the Arm Generic Interrupt Controller Architecture
Specification GIC architecture version 3 and version 4 document
(see 2.2.1 Special INTIDs paragraph), these INTIDs are reserved
for special purposes and should be ignored for now.

For the ITS implementation, the INTID 1023 must be ignored since this
special INTID will trigger after an LPI acknowledge, thus triggering
the spurious interrupt handler.

The GICv3 Linux implementation ignores these INTIDs the same way.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
This commit is contained in:
Neil Armstrong 2021-08-06 16:11:47 +02:00 • committed by Christopher Friedt
commit d55991b98e
1 changed files with 13 additions and 0 deletions
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13
arch/arm64/core/isr_wrapper.S
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@ -46,6 +46,19 @@ SECTION_FUNC(TEXT, _isr_wrapper)
bl z_soc_irq_get_active
#endif /* !CONFIG_ARM_CUSTOM_INTERRUPT_CONTROLLER */
#if CONFIG_GIC_VER >= 3
/*
* Ignore Special INTIDs 1020..1023 see 2.2.1 of Arm Generic Interrupt Controller
* Architecture Specification GIC architecture version 3 and version 4
*/
cmp x0, 1019
b.le oob
cmp x0, 1023
b.gt oob
b spurious_continue
oob:
#endif
/* IRQ out of bounds */
mov x1, #(CONFIG_NUM_IRQS - 1)
cmp x0, x1