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https://github.com/SerenityOS/serenity.git
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0482f4e117
Linux did the same thing 18 years ago and their reasons for the change are similar to ours - https://github.com/torvalds/linux/commit/7d12e78 Most interrupt handlers (i.e. IRQ handlers) never used the register state reference anywhere so there's simply no need of passing it around. I didn't measure the performance boost but surely this change can't make things worse anyway.
71 lines
1.7 KiB
C++
71 lines
1.7 KiB
C++
/*
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* Copyright (c) 2023, Pankaj R <dev@pankajraghav.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <Kernel/Arch/InterruptManagement.h>
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#include <Kernel/Arch/PCIMSI.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Interrupts/PCIIRQHandler.h>
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namespace Kernel::PCI {
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IRQHandler::IRQHandler(PCI::Device& device, u8 irq)
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: GenericInterruptHandler(irq)
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, device(device)
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{
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auto type = device.get_interrupt_type();
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if (type == PCI::InterruptType::PIN)
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m_responsible_irq_controller = InterruptManagement::the().get_responsible_irq_controller(irq);
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if (is_registered())
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disable_irq();
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}
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bool IRQHandler::eoi()
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{
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dbgln_if(IRQ_DEBUG, "EOI IRQ {}", interrupt_number());
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if (m_shared_with_others)
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return false;
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if (!m_responsible_irq_controller.is_null())
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m_responsible_irq_controller->eoi(*this);
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else
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msi_signal_eoi();
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return true;
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}
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void IRQHandler::enable_irq()
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{
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dbgln_if(IRQ_DEBUG, "Enable IRQ {}", interrupt_number());
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if (!is_registered())
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register_interrupt_handler();
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m_enabled = true;
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if (m_shared_with_others)
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return;
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if (!m_responsible_irq_controller.is_null())
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m_responsible_irq_controller->enable(*this);
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else
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device.enable_interrupt(interrupt_number());
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}
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void IRQHandler::disable_irq()
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{
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dbgln_if(IRQ_DEBUG, "Disable IRQ {}", interrupt_number());
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m_enabled = false;
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if (m_shared_with_others)
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return;
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if (!m_responsible_irq_controller.is_null())
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m_responsible_irq_controller->disable(*this);
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else
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device.disable_interrupt(interrupt_number());
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}
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bool IRQHandler::handle_interrupt()
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{
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return handle_irq();
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}
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}
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