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Kernel: Add SharedIRQHandler class

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This class represents a shared interrupt handler. This class will not be
created automatically but only if two IRQ Handlers are sharing the same
IRQ number.
This commit is contained in:
Liav A 2020-02-22 19:56:55 +02:00 committed by Andreas Kling
parent 740534cd67
commit 9587f2d3ee
Notes: sideshowbarker 2024-07-19 09:06:44 +09:00 
Author: https://github.com/supercomputer7
Commit: https://github.com/SerenityOS/serenity/commit/9587f2d3ee8
Pull-request: https://github.com/SerenityOS/serenity/pull/1274
Reviewed-by: https://github.com/awesomekling
Reviewed-by: https://github.com/shannonbooth
2 changed files with 191 additions and 0 deletions
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130
Kernel/Interrupts/SharedIRQHandler.cpp Normal file
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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/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
kprintf("Interrupt Handler registered @ Shared Interrupt Handler %d\n", m_interrupt_number);
#endif
m_handlers.set(&handler);
enable_interrupt_vector();
}
void SharedIRQHandler::unregister_handler(GenericInterruptHandler& handler)
{
#ifdef INTERRUPT_DEBUG
kprintf("Interrupt Handler unregistered @ Shared Interrupt Handler %d\n", 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
InterruptManagement::the().eoi(interrupt_number());
return true;
}
SharedIRQHandler::SharedIRQHandler(u8 irq)
: GenericInterruptHandler(irq)
{
#ifdef INTERRUPT_DEBUG
kprintf("Shared Interrupt Handler registered @ %d\n", m_interrupt_number);
#endif
register_generic_interrupt_handler(irq, *this);
disable_interrupt_vector();
}
SharedIRQHandler::~SharedIRQHandler()
{
#ifdef INTERRUPT_DEBUG
kprintf("Shared Interrupt Handler unregistered @ %d\n", interrupt_number());
#endif
disable_interrupt_vector();
unregister_generic_interrupt_handler(interrupt_number(), *this);
}
void SharedIRQHandler::handle_interrupt(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;
InterruptManagement::the().enable(interrupt_number());
}
void SharedIRQHandler::disable_interrupt_vector()
{
if (!m_enabled)
return;
m_enabled = false;
InterruptManagement::the().disable(interrupt_number());
}
}

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Kernel/Interrupts/SharedIRQHandler.h Normal file
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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.
*/
#pragma once
#include <AK/HashTable.h>
#include <AK/NonnullOwnPtr.h>
#include <AK/Types.h>
#include <Kernel/Arch/i386/CPU.h>
#include <Kernel/Interrupts/GenericInterruptHandler.h>
namespace Kernel {
class IRQHandler;
class SharedIRQHandler final : public GenericInterruptHandler {
public:
static void initialize(u8 interrupt_number);
virtual ~SharedIRQHandler();
virtual void handle_interrupt(RegisterState& regs) override;
void register_handler(GenericInterruptHandler&);
void unregister_handler(GenericInterruptHandler&);
virtual bool eoi() override;
virtual size_t get_sharing_devices_count() const override { return m_handlers.size(); }
virtual bool is_shared_handler() const override { return true; }
virtual bool is_sharing_with_others() const override { return false; }
virtual HandlerPurpose purpose() const override { return HandlerPurpose::SharedIRQHandler; }
private:
void enable_interrupt_vector();
void disable_interrupt_vector();
explicit SharedIRQHandler(u8 interrupt_number);
bool m_enabled;
HashTable<GenericInterruptHandler*> m_handlers;
};
}