ladybird/Kernel/Interrupts/SpuriousInterruptHandler.h
Liav A 39c1783387 Kernel: Allow to install a real IRQ handler on a spurious one
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.
2020-12-21 00:19:21 +01:00

66 lines
2.7 KiB
C++

/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* All rights reserved.
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#pragma once
#include <AK/OwnPtr.h>
#include <AK/Types.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Interrupts/GenericInterruptHandler.h>
#include <Kernel/Interrupts/IRQController.h>
namespace Kernel {
class SpuriousInterruptHandler final : public GenericInterruptHandler {
public:
static void initialize(u8 interrupt_number);
virtual ~SpuriousInterruptHandler();
virtual void handle_interrupt(const RegisterState& regs) override;
void register_handler(GenericInterruptHandler&);
void unregister_handler(GenericInterruptHandler&);
virtual bool eoi() override;
virtual size_t sharing_devices_count() const override { return 1; }
virtual bool is_shared_handler() const override { return false; }
virtual bool is_sharing_with_others() const override { return false; }
virtual HandlerType type() const override { return HandlerType::SpuriousInterruptHandler; }
virtual const char* purpose() const override { return "Spurious Interrupt Handler"; }
virtual const char* controller() const override;
private:
void enable_interrupt_vector();
void disable_interrupt_vector();
explicit SpuriousInterruptHandler(u8 interrupt_number);
bool m_enabled;
bool m_real_irq { false };
RefPtr<IRQController> m_responsible_irq_controller;
OwnPtr<GenericInterruptHandler> m_real_handler;
};
}