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Kernel: Allow to install a real IRQ handler on a spurious one

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IRQ 7 and 15 on the PIC architecture are used for spurious interrupts.
IRQ 7 could also be used for LPT connection, and IRQ 15 can be used for
the secondary IDE channel. Therefore, we need to allow to install a
real IRQ handler and check if a real IRQ was asserted. If so, we handle
them in the usual way.

A note on this fix - unregistering or registering a new IRQ handler
after we already registered one in the spurious interrupt handler is
not supported yet.
This commit is contained in:
Liav A 2020-12-19 08:49:15 +02:00 • committed by Andreas Kling
parent cf0a12c68f
commit 39c1783387
3 changed files with 25 additions and 5 deletions
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4
Kernel/Arch/i386/CPU.cpp
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@ -583,6 +583,10 @@ void register_generic_interrupt_handler(u8 interrupt_number, GenericInterruptHan
return;
}
if (!s_interrupt_handler[interrupt_number]->is_shared_handler()) {
if (s_interrupt_handler[interrupt_number]->type() == HandlerType::SpuriousInterruptHandler) {
static_cast<SpuriousInterruptHandler*>(s_interrupt_handler[interrupt_number])->register_handler(handler);
return;
}
ASSERT(s_interrupt_handler[interrupt_number]->type() == HandlerType::IRQHandler);
auto& previous_handler = *s_interrupt_handler[interrupt_number];
s_interrupt_handler[interrupt_number] = nullptr;