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88c5992e0b
Even if the PIC was disabled it can still generate noise (spurious IRQs) so we need to register two handlers for handling such cases. Also, we declare interrupt service routine offset 0x20 to 0x2f as reserved, so when the PIC is disabled, we can handle spurious IRQs from the PIC at separate handlers.
48 lines
1.5 KiB
C++
48 lines
1.5 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/OwnPtr.h>
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#include <AK/Types.h>
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#include <Kernel/Interrupts/GenericInterruptHandler.h>
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#include <Kernel/Interrupts/IRQController.h>
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namespace Kernel {
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class SpuriousInterruptHandler final : public GenericInterruptHandler {
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public:
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static void initialize(u8 interrupt_number);
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static void initialize_for_disabled_master_pic();
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static void initialize_for_disabled_slave_pic();
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virtual ~SpuriousInterruptHandler();
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virtual bool handle_interrupt(const RegisterState& regs) override;
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void register_handler(GenericInterruptHandler&);
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void unregister_handler(GenericInterruptHandler&);
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virtual bool eoi() override;
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virtual size_t sharing_devices_count() const override { return 1; }
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virtual bool is_shared_handler() const override { return false; }
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virtual bool is_sharing_with_others() const override { return false; }
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virtual HandlerType type() const override { return HandlerType::SpuriousInterruptHandler; }
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virtual StringView purpose() const override;
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virtual StringView controller() const override;
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void enable_interrupt_vector_for_disabled_pic();
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private:
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void enable_interrupt_vector();
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void disable_interrupt_vector();
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explicit SpuriousInterruptHandler(u8 interrupt_number);
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bool m_enabled { false };
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bool m_real_irq { false };
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RefPtr<IRQController> m_responsible_irq_controller;
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OwnPtr<GenericInterruptHandler> m_real_handler;
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};
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}
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