ladybird/Kernel/Interrupts/SharedIRQHandler.cpp
Liav A f86be46c98 Kernel: Abstract IRQ controller handling from Interrupt handlers
Now we don't send raw numbers, but we let the IRQController object to
figure out the correct IRQ number.
This helps in a situation when we have 2 or more IOAPICs, so if IOAPIC
1 is assigned for IRQs 0-23 and IOAPIC 2 is assigned for IRQs 24-47,
if an IRQHandler of IRQ 25 invokes disable() for example, it will call
his responsible IRQController (IOAPIC 2), and the IRQController will
subtract the IRQ number with his assigned offset, and the result is that
the second redirection entry in IOAPIC 2 will be masked.
2020-03-24 16:15:33 +01:00

129 lines
4.1 KiB
C++

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