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Kernel: Simplify (un)registering interrupt logic

Browse source 
Lose a level of indentation and remove a superfluous `handler_slot`
check.
This commit is contained in:
Jelle Raaijmakers 2023-01-17 20:47:51 +01:00
parent 100c8f9bcf
commit 5f85f1abaa
2 changed files with 59 additions and 64 deletions
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63
Kernel/Arch/aarch64/Interrupts.cpp
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@ -64,48 +64,45 @@ static void revert_to_unused_handler(u8 interrupt_number)
void register_generic_interrupt_handler(u8 interrupt_number, GenericInterruptHandler& handler)
{
auto*& handler_slot = s_interrupt_handlers[interrupt_number];
if (handler_slot != nullptr) {
if (handler_slot->type() == HandlerType::UnhandledInterruptHandler) {
if (handler_slot) {
auto* unhandled_handler = static_cast<UnhandledInterruptHandler*>(handler_slot);
unhandled_handler->unregister_interrupt_handler();
delete unhandled_handler;
}
handler_slot = &handler;
return;
}
if (handler_slot->is_shared_handler() && !handler_slot->is_sharing_with_others()) {
VERIFY(handler_slot->type() == HandlerType::SharedIRQHandler);
static_cast<SharedIRQHandler*>(handler_slot)->register_handler(handler);
return;
}
if (!handler_slot->is_shared_handler()) {
if (handler_slot->type() == HandlerType::SpuriousInterruptHandler) {
// FIXME: Add support for spurious interrupts on aarch64
TODO_AARCH64();
}
VERIFY(handler_slot->type() == HandlerType::IRQHandler);
auto& previous_handler = *handler_slot;
handler_slot = nullptr;
SharedIRQHandler::initialize(interrupt_number);
VERIFY(handler_slot);
static_cast<SharedIRQHandler*>(handler_slot)->register_handler(previous_handler);
static_cast<SharedIRQHandler*>(handler_slot)->register_handler(handler);
return;
}
VERIFY_NOT_REACHED();
} else {
if (handler_slot == nullptr) {
handler_slot = &handler;
return;
}
if (handler_slot->type() == HandlerType::UnhandledInterruptHandler) {
auto* unhandled_handler = static_cast<UnhandledInterruptHandler*>(handler_slot);
unhandled_handler->unregister_interrupt_handler();
delete unhandled_handler;
handler_slot = &handler;
return;
}
if (handler_slot->is_shared_handler() && !handler_slot->is_sharing_with_others()) {
VERIFY(handler_slot->type() == HandlerType::SharedIRQHandler);
static_cast<SharedIRQHandler*>(handler_slot)->register_handler(handler);
return;
}
if (!handler_slot->is_shared_handler()) {
if (handler_slot->type() == HandlerType::SpuriousInterruptHandler) {
// FIXME: Add support for spurious interrupts on aarch64
TODO_AARCH64();
}
VERIFY(handler_slot->type() == HandlerType::IRQHandler);
auto& previous_handler = *handler_slot;
handler_slot = nullptr;
SharedIRQHandler::initialize(interrupt_number);
VERIFY(handler_slot);
static_cast<SharedIRQHandler*>(handler_slot)->register_handler(previous_handler);
static_cast<SharedIRQHandler*>(handler_slot)->register_handler(handler);
return;
}
VERIFY_NOT_REACHED();
}
void unregister_generic_interrupt_handler(u8 interrupt_number, GenericInterruptHandler& handler)
{
auto*& handler_slot = s_interrupt_handlers[interrupt_number];
VERIFY(handler_slot != nullptr);
if (handler_slot->type() == HandlerType::UnhandledInterruptHandler) {
if (handler_slot->type() == HandlerType::UnhandledInterruptHandler)
return;
}
if (handler_slot->is_shared_handler() && !handler_slot->is_sharing_with_others()) {
VERIFY(handler_slot->type() == HandlerType::SharedIRQHandler);
auto* shared_handler = static_cast<SharedIRQHandler*>(handler_slot);