mirror of
https://github.com/RGBCube/serenity
synced 2025-05-19 02:45:08 +00:00
ed6c1f53af
This ensures we safely handle interrupts (which can call virtual functions), so they don't happen in the constructor - this pattern can lead to a crash, if we are still in the constructor context because not all methods are available for usage (some are pure virtual, so it's possible to call __cxa_pure_virtual). Also, under some conditions like adding a PCI device via PCI-passthrough mechanism in QEMU, it became exposed to the eye that the code asserts on RNG::handle_device_config_change(). That device has no configuration but if the hypervisor still misbehaves and tries to configure it, we should simply return false to indicate nothing happened.
82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
/*
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* Copyright (c) 2021, Kyle Pereira <hey@xylepereira.me>
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* Copyright (c) 2021, the SerenityOS developers.
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Bus/VirtIO/ConsolePort.h>
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#include <Kernel/Bus/VirtIO/Device.h>
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#include <Kernel/Memory/RingBuffer.h>
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namespace Kernel::VirtIO {
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class Console
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: public VirtIO::Device
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, public RefCounted<Console> {
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friend VirtIO::ConsolePort;
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public:
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static NonnullRefPtr<Console> must_create(PCI::Address address);
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virtual ~Console() override = default;
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virtual StringView purpose() const override { return class_name(); }
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unsigned device_id() const
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{
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return m_device_id;
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}
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virtual void initialize() override;
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private:
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virtual StringView class_name() const override { return "VirtIOConsole"; }
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explicit Console(PCI::Address);
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enum class ControlEvent : u16 {
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DeviceReady = 0,
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DeviceAdd = 1,
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PortReady = 3,
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ConsolePort = 4,
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PortOpen = 6,
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};
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struct [[gnu::packed]] ControlMessage {
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u32 id;
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u16 event;
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u16 value;
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enum class Status : u16 {
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Success = 1,
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Failure = 0
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};
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enum class PortStatus : u16 {
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Open = 1,
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Close = 0
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};
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};
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constexpr static u16 CONTROL_RECEIVEQ = 2;
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constexpr static u16 CONTROL_TRANSMITQ = 3;
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constexpr static size_t CONTROL_MESSAGE_SIZE = sizeof(ControlMessage);
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constexpr static size_t CONTROL_BUFFER_SIZE = CONTROL_MESSAGE_SIZE * 32;
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virtual bool handle_device_config_change() override;
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virtual void handle_queue_update(u16 queue_index) override;
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Vector<RefPtr<ConsolePort>> m_ports;
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void setup_multiport();
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void process_control_message(ControlMessage message);
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void write_control_message(ControlMessage message);
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void send_open_control_message(unsigned port_number, bool open);
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unsigned m_device_id;
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OwnPtr<Memory::RingBuffer> m_control_transmit_buffer;
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OwnPtr<Memory::RingBuffer> m_control_receive_buffer;
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WaitQueue m_control_wait_queue;
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static unsigned next_device_id;
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};
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}
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