mirror of
https://github.com/RGBCube/serenity
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63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
/*
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* Copyright (c) 2021, the SerenityOS developers.
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* Copyright (c) 2021, Kyle Pereira <hey@xylepereira.me>
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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/FileSystem/FileDescription.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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class VirtIOConsole;
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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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class VirtIOConsolePort
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: public CharacterDevice {
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public:
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explicit VirtIOConsolePort(unsigned port, VirtIOConsole&);
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void handle_queue_update(Badge<VirtIOConsole>, u16 queue_index);
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void set_open(Badge<VirtIOConsole>, bool state) { m_open = state; }
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bool is_open() const { return m_open; }
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private:
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constexpr static size_t RINGBUFFER_SIZE = 2 * PAGE_SIZE;
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virtual StringView class_name() const override { return "VirtIOConsolePort"; }
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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 KResultOr<NonnullRefPtr<FileDescription>> open(int options) override;
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mode_t required_mode() const override { return 0666; }
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String device_name() const override;
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void init_receive_buffer();
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static unsigned next_device_id;
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u16 m_receive_queue {};
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u16 m_transmit_queue {};
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OwnPtr<RingBuffer> m_receive_buffer;
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OwnPtr<RingBuffer> m_transmit_buffer;
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VirtIOConsole& m_console;
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unsigned m_port;
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bool m_open { false };
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Atomic<bool> m_receive_buffer_exhausted;
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};
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}
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