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/*
* Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Arch/InterruptManagement.h>
#include <Kernel/Arch/x86/Interrupts.h>
#include <Kernel/Interrupts/PIC.h>
#include <Kernel/Interrupts/SpuriousInterruptHandler.h>
#include <Kernel/Sections.h>
namespace Kernel {
UNMAP_AFTER_INIT void SpuriousInterruptHandler::initialize(u8 interrupt_number)
{
auto* handler = new SpuriousInterruptHandler(interrupt_number);
handler->register_interrupt_handler();
}
void SpuriousInterruptHandler::initialize_for_disabled_master_pic()
{
auto* handler = new SpuriousInterruptHandler(7);
register_disabled_interrupt_handler(7, *handler);
handler->enable_interrupt_vector_for_disabled_pic();
}
void SpuriousInterruptHandler::initialize_for_disabled_slave_pic()
{
auto* handler = new SpuriousInterruptHandler(15);
register_disabled_interrupt_handler(15, *handler);
handler->enable_interrupt_vector_for_disabled_pic();
}
void SpuriousInterruptHandler::register_handler(GenericInterruptHandler& handler)
{
VERIFY(!m_real_handler);
m_real_handler = adopt_own_if_nonnull(&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;
}
StringView SpuriousInterruptHandler::purpose() const
{
if (!m_real_handler)
return "Spurious Interrupt Handler"sv;
return m_real_handler->purpose();
}
SpuriousInterruptHandler::SpuriousInterruptHandler(u8 irq)
: GenericInterruptHandler(irq)
, m_responsible_irq_controller(InterruptManagement::the().get_responsible_irq_controller(irq))
{
}
SpuriousInterruptHandler::~SpuriousInterruptHandler() = default;
bool SpuriousInterruptHandler::handle_interrupt(RegisterState const& 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 << interrupt_number())) {
m_real_irq = true; // remember that we had a real IRQ, when EOI later!
if (m_real_handler->handle_interrupt(state)) {
m_real_handler->increment_invoking_counter();
return true;
}
return false;
}
dbgln("Spurious interrupt, vector {}", interrupt_number());
return true;
}
void SpuriousInterruptHandler::enable_interrupt_vector_for_disabled_pic()
{
m_enabled = true;
m_responsible_irq_controller = InterruptManagement::the().get_responsible_irq_controller(IRQControllerType::i8259, 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);
}
StringView SpuriousInterruptHandler::controller() const
{
if (m_responsible_irq_controller->type() == IRQControllerType::i82093AA)
return "";
return m_responsible_irq_controller->model();
}
}
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