Kernel: Move all Graphics-related code into Devices/GPU directory

Like the HID, Audio and Storage subsystem, the Graphics subsystem (which
handles GPUs technically) exposes unix device files (typically in /dev).
To ensure consistency across the repository, move all related files to a
new directory under Kernel/Devices called "GPU".

Also remove the redundant "GPU" word from the VirtIO driver directory,
and the word "Graphics" from GraphicsManagement.{h,cpp} filenames.

Kernel/Devices/GPU/Console/GenericFramebufferConsole.h

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Types.h>
+#include <Kernel/Devices/GPU/Console/Console.h>
+#include <Kernel/Memory/PhysicalAddress.h>
+
+namespace Kernel::Graphics {
+
+class GenericFramebufferConsoleImpl : public Console {
+public:
+    virtual size_t bytes_per_base_glyph() const override;
+    virtual size_t chars_per_line() const override;
+
+    virtual size_t max_column() const override { return m_width / (m_glyph_columns + m_glyph_spacing); }
+    virtual size_t max_row() const override { return m_height / m_glyph_rows; }
+
+    virtual bool is_hardware_paged_capable() const override { return false; }
+    virtual bool has_hardware_cursor() const override { return false; }
+
+    virtual void set_cursor(size_t x, size_t y) override;
+
+    virtual void clear(size_t x, size_t y, size_t length) override;
+    virtual void write(size_t x, size_t y, char ch, Color background, Color foreground, bool critical = false) override;
+    virtual void write(size_t x, size_t y, char ch, bool critical = false) override;
+    virtual void write(char ch, bool critical = false) override;
+
+    virtual void enable() override;
+    virtual void disable() override;
+
+    virtual void set_resolution(size_t width, size_t height, size_t pitch) = 0;
+
+protected:
+    virtual void hide_cursor() override;
+    virtual void show_cursor() override;
+
+    GenericFramebufferConsoleImpl(size_t width, size_t height, size_t pitch)
+        : Console(width, height)
+        , m_pitch(pitch)
+    {
+        m_cursor_overriden_pixels.fill(0);
+    }
+    virtual u8* framebuffer_data() = 0;
+    size_t framebuffer_pitch() const { return m_pitch; }
+    virtual void clear_glyph(size_t x, size_t y);
+
+    union FramebufferOffset {
+        u8* bytes;
+        u32* pixels;
+    };
+    FramebufferOffset framebuffer_offset(size_t x, size_t y);
+    void flush_glyph(size_t x, size_t y);
+
+    size_t const m_glyph_spacing { 1 };
+    size_t const m_glyph_columns { 8 };
+    size_t const m_glyph_rows { 16 };
+
+    Array<u32, 8> m_cursor_overriden_pixels;
+
+    size_t m_pitch;
+};
+
+class GenericFramebufferConsole : public GenericFramebufferConsoleImpl {
+public:
+    virtual void clear(size_t x, size_t y, size_t length) override;
+    virtual void write(size_t x, size_t y, char ch, Color background, Color foreground, bool critical = false) override;
+
+    virtual void enable() override;
+    virtual void disable() override;
+
+protected:
+    GenericFramebufferConsole(size_t width, size_t height, size_t pitch)
+        : GenericFramebufferConsoleImpl(width, height, pitch)
+    {
+    }
+
+    virtual void clear_glyph(size_t x, size_t y) override;
+
+    mutable Spinlock<LockRank::None> m_lock {};
+};
+
+}