mirror of
https://github.com/SerenityOS/serenity
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64 lines
2 KiB
C++
64 lines
2 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 <AK/Badge.h>
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#include <Kernel/Bus/VirtIO/Device.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/FileSystem/OpenFileDescription.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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#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 ConsolePort
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: public CharacterDevice {
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public:
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static ErrorOr<NonnullLockRefPtr<ConsolePort>> try_create(unsigned port, VirtIO::Console&);
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void handle_queue_update(Badge<VirtIO::Console>, u16 queue_index);
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void set_open(Badge<VirtIO::Console>, bool state) { m_open = state; }
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bool is_open() const { return m_open; }
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void init_receive_buffer(Badge<Console>);
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private:
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constexpr static size_t RINGBUFFER_SIZE = 2 * PAGE_SIZE;
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ConsolePort(unsigned port, VirtIO::Console& console, NonnullOwnPtr<Memory::RingBuffer> receive_buffer, NonnullOwnPtr<Memory::RingBuffer> transmit_buffer);
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virtual StringView class_name() const override { return "VirtIOConsolePort"sv; }
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virtual bool can_read(OpenFileDescription const&, u64) const override;
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virtual ErrorOr<size_t> read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t) override;
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virtual bool can_write(OpenFileDescription const&, u64) const override;
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virtual ErrorOr<size_t> write(OpenFileDescription&, u64, UserOrKernelBuffer const&, size_t) override;
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virtual ErrorOr<NonnullRefPtr<OpenFileDescription>> open(int options) override;
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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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NonnullOwnPtr<Memory::RingBuffer> m_receive_buffer;
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NonnullOwnPtr<Memory::RingBuffer> m_transmit_buffer;
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VirtIO::Console& 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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