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https://github.com/RGBCube/serenity
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d61c23569e
The VirtIO specification defines many types of devices with different purposes, and it also defines 3 possible transport mediums where devices could be connected to the host machine. We only care about the PCIe transport, but this commit puts the actual foundations for supporting the lean MMIO transport too in the future. To ensure things are kept abstracted but still functional, the VirtIO transport code is responsible for what is deemed as related to an actual transport type - allocation of interrupt handlers and tinkering with low level transport-related registers, etc.
80 lines
2.1 KiB
C++
80 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 AtomicRefCounted<Console> {
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friend VirtIO::ConsolePort;
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public:
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static NonnullLockRefPtr<Console> must_create_for_pci_instance(PCI::DeviceIdentifier const&);
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virtual ~Console() override = default;
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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 ErrorOr<void> initialize_virtio_resources() override;
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private:
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virtual StringView class_name() const override { return "VirtIOConsole"sv; }
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explicit Console(NonnullOwnPtr<TransportEntity>);
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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<LockRefPtr<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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