[Bug 276793] vt(4) doesn't respect font specified in loader.conf(5) on bios boot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=276793

--- Comment #4 from Warner Losh <imp@FreeBSD.org> ---
The font is autoloaded only in the graphics loader, not the text loader. The
load function is stubbed out for the text loader.

vt gets its fonts (not font names) from the boot loader.

Since the font stuff was intertwingled with the gfx stuff, it was trimmed for
the text loader. The intertwingling and the unwillingness to heed my review
feedback in the original reviews has been a great source of frustration as I
have to unwind the needless interdependencies one at a time as needs present
themselves.

autoload_font() at the very least would need to move to a new file (it can't be
co-located with the gfx stuff if you want the text loader to use it). And
either we'd need to remove cons_update_mode from it and require the client
loaders to call it after autoload_font, or we'd need to add a new stub for that
in gfx_bios.c. I'm not sure which is more practical since the font_insert stuff
has other gfx dependencies that at first glance likely could be made more
formal APIs so that the gfx backend and the text backend could do sane things,
but I've not looked at in enough depth to say for sure. I'd say a day or two of
effort would be needed to come up with an acceptable refactoring (though maybe
more).

So either we have the status quo where you get what you get, we refactor
autoload_font and the other font stuff to have 0 dependencies on anything gfx,
or we devise a new way for vt to get its fonts. Given history and my already
having spend a lot of time unwinding dependencies, I opted for the easiest of
these options initially.

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