Kernel/ConsoleDevice.h


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/CircularQueue.h>
#include <AK/Vector.h>
#include <Kernel/Devices/CharacterDevice.h>

namespace Kernel {

class ConsoleDevice final : public CharacterDevice {
    AK_MAKE_ETERNAL
public:
    static ConsoleDevice& the();
    static void initialize();
    static bool is_initialized();

    ConsoleDevice();
    virtual ~ConsoleDevice() override;

    // ^CharacterDevice
    virtual bool can_read(const Kernel::FileDescription&, size_t) const override;
    virtual bool can_write(const Kernel::FileDescription&, size_t) const override { return true; }
    virtual Kernel::KResultOr<size_t> read(FileDescription&, u64, Kernel::UserOrKernelBuffer&, size_t) override;
    virtual Kernel::KResultOr<size_t> write(FileDescription&, u64, const Kernel::UserOrKernelBuffer&, size_t) override;
    virtual StringView class_name() const override { return "Console"; }

    void put_char(char);

    const CircularQueue<char, 16384>& logbuffer() const { return m_logbuffer; }

    // ^Device
    virtual mode_t required_mode() const override { return 0666; }
    virtual String device_name() const override { return "console"; }

private:
    CircularQueue<char, 16384> m_logbuffer;
};

}