mirror of
https://github.com/RGBCube/serenity
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1492bb2fd6
This allows two-way communication with the host through a VirtIOConsole. This is necessary for features like clipboard sharing.
53 lines
1.6 KiB
C++
53 lines
1.6 KiB
C++
/*
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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/Devices/CharacterDevice.h>
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#include <Kernel/VM/RingBuffer.h>
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#include <Kernel/VirtIO/VirtIO.h>
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namespace Kernel {
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#define VIRTIO_CONSOLE_F_SIZE (1 << 0)
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#define VIRTIO_CONSOLE_F_MULTIPORT (1 << 1)
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#define VIRTIO_CONSOLE_F_EMERG_WRITE (1 << 2)
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#define RECEIVEQ 0
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#define TRANSMITQ 1
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class VirtIOConsole final : public CharacterDevice
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, public VirtIODevice {
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public:
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VirtIOConsole(PCI::Address);
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virtual ~VirtIOConsole() override;
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virtual const char* purpose() const override { return class_name(); }
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private:
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constexpr static size_t RINGBUFFER_SIZE = 2 * PAGE_SIZE;
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virtual const char* class_name() const override { return m_class_name.characters(); }
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virtual bool can_read(const FileDescription&, size_t) const override;
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virtual KResultOr<size_t> read(FileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual bool can_write(const FileDescription&, size_t) const override;
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virtual KResultOr<size_t> write(FileDescription&, u64, const UserOrKernelBuffer&, size_t) override;
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virtual mode_t required_mode() const override { return 0666; }
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virtual bool handle_device_config_change() override;
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virtual String device_name() const override { return String::formatted("hvc{}", minor()); }
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virtual void handle_queue_update(u16 queue_index) override;
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void init_receive_buffer();
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OwnPtr<RingBuffer> m_receive_buffer;
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OwnPtr<RingBuffer> m_transmit_buffer;
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static unsigned next_device_id;
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};
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}
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