Kernel: Move TTY-related code to a new subdirectory under Devices

The TTY subsystem is represented with unix devices, so it should be
under the Devices directory like the Audio, Storage, GPU and HID
subsystems.

Kernel/Devices/TTY/VirtualConsole.h

@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Noncopyable.h>
+#include <AK/Vector.h>
+#include <Kernel/API/KeyCode.h>
+#include <Kernel/Devices/GPU/Console/Console.h>
+#include <Kernel/Devices/Generic/ConsoleDevice.h>
+#include <Kernel/Devices/HID/Management.h>
+#include <Kernel/Devices/TTY/TTY.h>
+#include <LibVT/Attribute.h>
+#include <LibVT/Color.h>
+#include <LibVT/Position.h>
+#include <LibVT/Terminal.h>
+
+namespace Kernel {
+
+class ConsoleManagement;
+class VirtualConsole;
+// FIXME: This implementation has no knowledge about keeping terminal history...
+class ConsoleImpl final : public VT::Terminal {
+public:
+    explicit ConsoleImpl(VirtualConsole&);
+
+    virtual void set_size(u16 columns, u16 rows) override;
+
+private:
+    virtual void invalidate_cursor() override;
+    virtual void clear() override;
+    virtual void clear_history() override;
+
+    virtual void scroll_up(u16 region_top, u16 region_bottom, size_t count) override;
+    virtual void scroll_down(u16 region_top, u16 region_bottom, size_t count) override;
+    virtual void scroll_left(u16 row, u16 column, size_t count) override;
+    virtual void scroll_right(u16 row, u16 column, size_t count) override;
+    virtual void put_character_at(unsigned row, unsigned column, u32 ch) override;
+    virtual void clear_in_line(u16 row, u16 first_column, u16 last_column) override;
+};
+
+class VirtualConsole final : public TTY
+    , public KeyboardClient
+    , public VT::TerminalClient {
+    friend class ConsoleManagement;
+    friend class DeviceManagement;
+    friend class ConsoleImpl;
+    friend class VT::Terminal;
+
+public:
+    struct Line {
+        bool dirty;
+        size_t length;
+    };
+
+    struct Cell {
+        void clear()
+        {
+            ch = ' ';
+            attribute.reset();
+        }
+        char ch;
+        VT::Attribute attribute;
+    };
+
+public:
+    static NonnullLockRefPtr<VirtualConsole> create(size_t index);
+    static NonnullLockRefPtr<VirtualConsole> create_with_preset_log(size_t index, CircularQueue<char, 16384> const&);
+
+    virtual ~VirtualConsole() override;
+
+    size_t index() const { return m_index; }
+
+    void refresh_after_resolution_change();
+
+    bool is_graphical() const { return m_graphical; }
+    void set_graphical(bool graphical);
+
+    void emit_char(char);
+
+private:
+    explicit VirtualConsole(unsigned const index);
+    // ^KeyboardClient
+    virtual void on_key_pressed(KeyEvent) override;
+
+    // ^TTY
+    virtual ErrorOr<NonnullOwnPtr<KString>> pseudo_name() const override;
+    virtual ErrorOr<size_t> on_tty_write(UserOrKernelBuffer const&, size_t) override;
+    virtual ErrorOr<void> ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg) override;
+    virtual void echo(u8) override;
+
+    // ^TerminalClient
+    virtual void beep() override;
+    virtual void set_window_title(StringView) override;
+    virtual void set_window_progress(int, int) override;
+    virtual void terminal_did_resize(u16 columns, u16 rows) override;
+    virtual void terminal_history_changed(int) override;
+    virtual void emit(u8 const*, size_t) override;
+    virtual void set_cursor_shape(VT::CursorShape) override;
+    virtual void set_cursor_blinking(bool) override;
+
+    // ^CharacterDevice
+    virtual StringView class_name() const override { return "VirtualConsole"sv; }
+
+    void set_active(bool);
+    void flush_dirty_lines();
+
+    unsigned m_index;
+    bool m_active { false };
+    bool m_graphical { false };
+
+private:
+    void initialize();
+
+    void invalidate_cursor(size_t row);
+
+    void clear();
+
+    Cell& cell_at(size_t column, size_t row);
+
+    using ParamVector = Vector<unsigned, 4>;
+
+    void scroll_down(u16 region_top, u16 region_bottom, size_t count);
+    void scroll_up(u16 region_top, u16 region_bottom, size_t count);
+    void scroll_left(u16 row, u16 column, size_t count);
+    void scroll_right(u16 row, u16 column, size_t count);
+    void clear_line(size_t index)
+    {
+        clear_in_line(index, 0, m_console_impl.columns() - 1);
+    }
+    void clear_in_line(u16 row, u16 first_column, u16 last_column);
+    void put_character_at(unsigned row, unsigned column, u32 ch, const VT::Attribute&);
+
+    OwnPtr<Memory::Region> m_cells;
+    Vector<VirtualConsole::Line> m_lines;
+    ConsoleImpl m_console_impl;
+};
+
+}