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The support is very basic - Each component that needs to handle IRQs inherits from InterruptHandler class. When the InterruptHandler constructor is called it registers itself in a SharedInterruptHandler. When an IRQ is fired, the SharedInterruptHandler is invoked, then it iterates through a list of the registered InterruptHandlers. Also, InterruptEnabler class was created to provide a way to enable IRQ handling temporarily, similar to InterruptDisabler (in CPU.h, which does the opposite). In addition to that a PCI::Device class has been added, that inherits from InterruptHandler.
75 lines
2.5 KiB
C++
75 lines
2.5 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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#include <Kernel/InterruptHandler.h>
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#include <Kernel/SharedInterruptHandler.h>
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InterruptHandler::InterruptHandler(u8 irq)
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: m_irq_number(irq)
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{
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SharedInterruptHandler::from(m_irq_number).register_handler(*this);
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disable_interrupts();
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}
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InterruptHandler::~InterruptHandler()
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{
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disable_interrupts();
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SharedInterruptHandler::from(m_irq_number).unregister_handler(*this);
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}
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void InterruptHandler::enable_interrupts()
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{
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m_enabled = true;
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}
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void InterruptHandler::change_irq_number(u8 irq_number)
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{
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bool was_enabled = m_enabled;
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disable_interrupts();
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SharedInterruptHandler::from(m_irq_number).unregister_handler(*this);
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m_irq_number = irq_number;
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SharedInterruptHandler::from(m_irq_number).register_handler(*this);
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if (was_enabled)
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enable_interrupts();
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}
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void InterruptHandler::disable_interrupts()
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{
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m_enabled = false;
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}
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InterruptHandler::Enabler::Enabler(InterruptHandler& handler)
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: m_handler(handler)
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, m_was_enabled(m_handler.is_enabled())
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{
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m_handler.enable_interrupts();
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}
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InterruptHandler::Enabler::~Enabler()
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{
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if (!m_was_enabled)
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m_handler.disable_interrupts();
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}
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