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https://github.com/RGBCube/serenity
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20743e8aed
As we removed the support of VBE modesetting that was done by GRUB early on boot, we need to determine if we can modeset the resolution with our drivers, and if not, we should enable text mode and ensure that SystemServer knows about it too. Also, SystemServer should first check if there's a framebuffer device node, which is an indication that text mode was not even if it was requested. Then, if it doesn't find it, it should check what boot_mode argument the user specified (in case it's self-test). This way if we try to use bochs-display device (which is not VGA compatible) and request a text mode, it will not honor the request and will continue with graphical mode. Also try to print critical messages with mininum memory allocations possible. In LibVT, We make the implementation flexible for kernel-specific methods that are implemented in ConsoleImpl class.
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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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/RefCounted.h>
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#include <AK/Types.h>
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#include <Kernel/Graphics/Console/VGAConsole.h>
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#include <Kernel/SpinLock.h>
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namespace Kernel::Graphics {
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class TextModeConsole final : public VGAConsole {
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public:
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static NonnullRefPtr<TextModeConsole> initialize(const VGACompatibleAdapter& adapter);
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virtual size_t chars_per_line() const override { return width(); };
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virtual bool has_hardware_cursor() const override { return true; }
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virtual bool is_hardware_paged_capable() const override { return true; }
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virtual size_t bytes_per_base_glyph() const override { return 2; }
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virtual void set_cursor(size_t x, size_t y) override;
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virtual void hide_cursor() override;
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virtual void show_cursor() override;
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virtual void clear(size_t x, size_t y, size_t length) const override;
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virtual void write(size_t x, size_t y, char ch) const override;
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virtual void write(size_t x, size_t y, String cstring) const override;
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virtual void write(size_t x, size_t y, char ch, Color background, Color foreground) const override;
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virtual void write(size_t x, size_t y, String, Color background, Color foreground) const override;
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virtual void write(char ch) const override;
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virtual void enable() override { }
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virtual void disable() override { VERIFY_NOT_REACHED(); }
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private:
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void clear_vga_row(u16 row);
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void set_vga_start_row(u16 row);
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explicit TextModeConsole(const VGACompatibleAdapter&);
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mutable SpinLock<u8> m_vga_lock;
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u16 m_vga_start_row { 0 };
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u16 m_current_vga_start_address { 0 };
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u8* m_current_vga_window { nullptr };
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u16 m_cursor_x { 0 };
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u16 m_cursor_y { 0 };
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};
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}
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