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39c1783387
IRQ 7 and 15 on the PIC architecture are used for spurious interrupts. IRQ 7 could also be used for LPT connection, and IRQ 15 can be used for the secondary IDE channel. Therefore, we need to allow to install a real IRQ handler and check if a real IRQ was asserted. If so, we handle them in the usual way. A note on this fix - unregistering or registering a new IRQ handler after we already registered one in the spurious interrupt handler is not supported yet.
105 lines
3.6 KiB
C++
105 lines
3.6 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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#include <Kernel/Interrupts/InterruptManagement.h>
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#include <Kernel/Interrupts/SpuriousInterruptHandler.h>
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namespace Kernel {
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void SpuriousInterruptHandler::initialize(u8 interrupt_number)
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{
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new SpuriousInterruptHandler(interrupt_number);
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}
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void SpuriousInterruptHandler::register_handler(GenericInterruptHandler& handler)
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{
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ASSERT(!m_real_handler);
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m_real_handler = &handler;
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}
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void SpuriousInterruptHandler::unregister_handler(GenericInterruptHandler&)
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{
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TODO();
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}
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bool SpuriousInterruptHandler::eoi()
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{
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// Actually check if IRQ7 or IRQ15 are spurious, and if not, call EOI with the correct interrupt number.
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if (m_real_irq) {
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m_responsible_irq_controller->eoi(*this);
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m_real_irq = false; // return to default state!
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return true;
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}
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m_responsible_irq_controller->spurious_eoi(*this);
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return false;
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}
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SpuriousInterruptHandler::SpuriousInterruptHandler(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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}
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SpuriousInterruptHandler::~SpuriousInterruptHandler()
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{
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}
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void SpuriousInterruptHandler::handle_interrupt(const RegisterState& state)
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{
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// Actually check if IRQ7 or IRQ15 are spurious, and if not, call the real handler to handle the IRQ.
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if (m_responsible_irq_controller->get_isr() & (1 << 15)) {
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m_real_irq = true; // remember that we had a real IRQ, when EOI later!
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m_real_handler->increment_invoking_counter();
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m_real_handler->handle_interrupt(state);
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return;
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}
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klog() << "Spurious Interrupt, vector " << interrupt_number();
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}
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void SpuriousInterruptHandler::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 SpuriousInterruptHandler::disable_interrupt_vector()
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{
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ASSERT(!m_real_irq); // this flag should not be set when we call this method
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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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const char* SpuriousInterruptHandler::controller() const
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{
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if (m_responsible_irq_controller->type() == IRQControllerType::i82093AA)
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return "";
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return m_responsible_irq_controller->model();
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}
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}
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