[WIP PATCH 1/2] Split framebuffer from vbe

[Vladimir 'phcoder' Serbinenko]

Hello. Here is my first attempt on splitting video_fb.mod from
vbe.mod. The idea was to make framebuffer code work with render_target
without knowing what the real video mode is and let video-card
specific code bother with things like double buffering and
modesetting. Two loader: linux and xnu have to pass framebuffer
address to their payload this is however problematic because in case
of double buffering framebuffer address may change. The only idea of
clean interface I see would be a function like
grub_video_get_framebuffer_info_and_fini
which will terminate the video driver thus ensuring that video mode
(including framebuffer address) won't change. Does anyone has a better
idea?

-- 
Regards
Vladimir 'phcoder' Serbinenko