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An IRQ handler should always be ready to respond to any IRQ. We must remember that hardware can generate IRQs without any interaction from our code at all. Ignoring IRQs in such cases is obviously not the right thing to do.
74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
/*
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* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
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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/HashTable.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <Kernel/Arch/i386/CPU.h>
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namespace Kernel {
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enum class HandlerType : u8 {
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IRQHandler = 1,
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SharedIRQHandler = 2,
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UnhandledInterruptHandler = 3,
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SpuriousInterruptHandler = 4
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};
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class GenericInterruptHandler {
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public:
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static GenericInterruptHandler& from(u8 interrupt_number);
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virtual ~GenericInterruptHandler();
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virtual void handle_interrupt(const RegisterState& regs) = 0;
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u8 interrupt_number() const { return m_interrupt_number; }
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size_t get_invoking_count() const { return m_invoking_count; }
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virtual size_t sharing_devices_count() const = 0;
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virtual bool is_shared_handler() const = 0;
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virtual bool is_sharing_with_others() const = 0;
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virtual HandlerType type() const = 0;
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virtual const char* purpose() const = 0;
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virtual const char* controller() const = 0;
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virtual bool eoi() = 0;
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void increment_invoking_counter();
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protected:
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void change_interrupt_number(u8 number);
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GenericInterruptHandler(u8 interrupt_number, bool disable_remap = false);
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private:
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size_t m_invoking_count { 0 };
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u8 m_interrupt_number { 0 };
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bool m_disable_remap { false };
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};
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}
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