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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/Interrupts/InterruptManagement.h>
#include <Kernel/Interrupts/SpuriousInterruptHandler.h>
namespace Kernel {
UNMAP_AFTER_INIT void SpuriousInterruptHandler::initialize(u8 interrupt_number)
{
auto* handler = new SpuriousInterruptHandler(interrupt_number);
handler->register_interrupt_handler();
}
void SpuriousInterruptHandler::register_handler(GenericInterruptHandler& handler)
{
VERIFY(!m_real_handler);
m_real_handler = &handler;
}
void SpuriousInterruptHandler::unregister_handler(GenericInterruptHandler&)
{
TODO();
}
bool SpuriousInterruptHandler::eoi()
{
// Actually check if IRQ7 or IRQ15 are spurious, and if not, call EOI with the correct interrupt number.
if (m_real_irq) {
m_responsible_irq_controller->eoi(*this);
m_real_irq = false; // return to default state!
return true;
}
m_responsible_irq_controller->spurious_eoi(*this);
return false;
}
SpuriousInterruptHandler::SpuriousInterruptHandler(u8 irq)
: GenericInterruptHandler(irq)
, m_responsible_irq_controller(InterruptManagement::the().get_responsible_irq_controller(irq))
{
}
SpuriousInterruptHandler::~SpuriousInterruptHandler()
{
}
void SpuriousInterruptHandler::handle_interrupt(const RegisterState& state)
{
// Actually check if IRQ7 or IRQ15 are spurious, and if not, call the real handler to handle the IRQ.
if (m_responsible_irq_controller->get_isr() & (1 << 15)) {
m_real_irq = true; // remember that we had a real IRQ, when EOI later!
m_real_handler->increment_invoking_counter();
m_real_handler->handle_interrupt(state);
return;
}
dbgln("Spurious interrupt, vector {}", interrupt_number());
}
void SpuriousInterruptHandler::enable_interrupt_vector()
{
if (m_enabled)
return;
m_enabled = true;
m_responsible_irq_controller->enable(*this);
}
void SpuriousInterruptHandler::disable_interrupt_vector()
{
VERIFY(!m_real_irq); // this flag should not be set when we call this method
if (!m_enabled)
return;
m_enabled = false;
m_responsible_irq_controller->disable(*this);
}
const char* SpuriousInterruptHandler::controller() const
{
if (m_responsible_irq_controller->type() == IRQControllerType::i82093AA)
return "";
return m_responsible_irq_controller->model();
}
}
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