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0b7fc525e1
Instead of blindly setting masks, if we want to disable an IRQ and it's already masked, we just return. The same happens if we want to enable an IRQ and it's unmasked.
60 lines
2.5 KiB
C++
60 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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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 { return 16; }
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virtual const char* model() const override { return "Dual i8259"; }
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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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