feat: Bochs VBE linear framebuffer support#2523
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I'm currently working on porting Doom to Hermit and needed a feature to directly write pixel data into the Bochs Graphics Adaptor as Hermit currently only has support for VGA in textmode.
The feature currently adds standard BGA preparation (Link to OSDev) with a hardcoded resolution (640x400), bpp (32) and a systemcall (sys_get_framebuffer) to receive the address of the framebuffer.
The systemcall falls back to 0 if there was a failure in initializing the framebuffer (e.g. if pci is missing, or the bga feature is not enabled).
I have currently only tested this feature with c programs on a mac using Qemu. The feature is also only available on the x86_64 architecture.