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ab87d42200
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.
126 lines
4 KiB
C++
126 lines
4 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/Arch/i386/CPU.h>
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#include <Kernel/Assertions.h>
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#include <Kernel/Interrupts/IRQHandler.h>
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#include <Kernel/Interrupts/InterruptManagement.h>
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#include <Kernel/Interrupts/PIC.h>
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#include <Kernel/Interrupts/SharedIRQHandler.h>
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//#define INTERRUPT_DEBUG
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namespace Kernel {
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void SharedIRQHandler::initialize(u8 interrupt_number)
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{
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new SharedIRQHandler(interrupt_number);
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}
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void SharedIRQHandler::register_handler(GenericInterruptHandler& handler)
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{
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#ifdef INTERRUPT_DEBUG
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klog() << "Interrupt Handler registered @ Shared Interrupt Handler " << m_interrupt_number;
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#endif
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m_handlers.set(&handler);
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enable_interrupt_vector();
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}
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void SharedIRQHandler::unregister_handler(GenericInterruptHandler& handler)
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{
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#ifdef INTERRUPT_DEBUG
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klog() << "Interrupt Handler unregistered @ Shared Interrupt Handler " << m_interrupt_number;
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#endif
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m_handlers.remove(&handler);
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if (m_handlers.is_empty())
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disable_interrupt_vector();
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}
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bool SharedIRQHandler::eoi()
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{
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#ifdef INTERRUPT_DEBUG
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dbg() << "EOI IRQ " << interrupt_number();
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#endif
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m_responsible_irq_controller->eoi(*this);
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return true;
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}
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SharedIRQHandler::SharedIRQHandler(u8 irq)
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: GenericInterruptHandler(irq)
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, m_responsible_irq_controller(InterruptManagement::the().get_responsible_irq_controller(irq))
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{
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#ifdef INTERRUPT_DEBUG
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klog() << "Shared Interrupt Handler registered @ " << m_interrupt_number;
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#endif
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disable_interrupt_vector();
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}
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SharedIRQHandler::~SharedIRQHandler()
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{
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#ifdef INTERRUPT_DEBUG
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klog() << "Shared Interrupt Handler unregistered @ " << interrupt_number();
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#endif
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disable_interrupt_vector();
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}
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void SharedIRQHandler::handle_interrupt(const RegisterState& regs)
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{
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ASSERT_INTERRUPTS_DISABLED();
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increment_invoking_counter();
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#ifdef INTERRUPT_DEBUG
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dbg() << "Interrupt @ " << interrupt_number();
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dbg() << "Interrupt Handlers registered - " << m_handlers.size();
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#endif
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int i = 0;
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for (auto* handler : m_handlers) {
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#ifdef INTERRUPT_DEBUG
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dbg() << "Going for Interrupt Handling @ " << i << ", Shared Interrupt " << interrupt_number();
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#endif
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ASSERT(handler != nullptr);
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handler->increment_invoking_counter();
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handler->handle_interrupt(regs);
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#ifdef INTERRUPT_DEBUG
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dbg() << "Going for Interrupt Handling @ " << i << ", Shared Interrupt " << interrupt_number() << " - End";
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#endif
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i++;
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}
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}
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void SharedIRQHandler::enable_interrupt_vector()
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{
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if (m_enabled)
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return;
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m_enabled = true;
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m_responsible_irq_controller->enable(*this);
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}
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void SharedIRQHandler::disable_interrupt_vector()
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{
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if (!m_enabled)
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return;
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m_enabled = false;
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m_responsible_irq_controller->disable(*this);
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}
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}
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