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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.
44 lines
1.4 KiB
C++
44 lines
1.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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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/Types.h>
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#include <Kernel/Interrupts/IRQController.h>
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namespace Kernel {
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static constexpr size_t pic_disabled_vector_base = 0x20;
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static constexpr size_t pic_disabled_vector_end = 0x2f;
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class PIC final : public IRQController {
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public:
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PIC();
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virtual void enable(const GenericInterruptHandler&) override;
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virtual void disable(const GenericInterruptHandler&) override;
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virtual void hard_disable() override;
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virtual void eoi(const GenericInterruptHandler&) const override;
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virtual bool is_vector_enabled(u8 number) const override;
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virtual bool is_enabled() const override;
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virtual void spurious_eoi(const GenericInterruptHandler&) const override;
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virtual u16 get_isr() const override;
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virtual u16 get_irr() const override;
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virtual u32 gsi_base() const override { return 0; }
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virtual size_t interrupt_vectors_count() const override { return 16; }
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virtual StringView model() const override { return "Dual i8259"sv; }
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virtual IRQControllerType type() const override { return IRQControllerType::i8259; }
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private:
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u16 m_cached_irq_mask { 0xffff };
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void eoi_interrupt(u8 irq) const;
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void enable_vector(u8 number);
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void remap(u8 offset);
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void complete_eoi() const;
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virtual void initialize() override;
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};
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}
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