Kernel/Graphics + SystemServer: Support text mode properly

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.

1 files changed, 6 insertions, 0 deletions

diff --git a/Kernel/Graphics/GraphicsDevice.h b/Kernel/Graphics/GraphicsDevice.h
index f4d3ae7e29..2279338f4f 100644
--- a/Kernel/Graphics/GraphicsDevice.h
+++ b/Kernel/Graphics/GraphicsDevice.h
@@ -25,9 +25,15 @@ public:
     virtual ~GraphicsDevice() = default;
     virtual void initialize_framebuffer_devices() = 0;
     virtual Type type() const = 0;
+    virtual void enable_consoles() = 0;
+    virtual void disable_consoles() = 0;
+    bool consoles_enabled() const { return m_consoles_enabled; }
+    virtual bool framebuffer_devices_initialized() const = 0;
 
 protected:
     GraphicsDevice() = default;
+
+    bool m_consoles_enabled { false };
 };
 
 }