Direct console output driver
version 0.01

Completely replaces bioscon.c
Old functions con_charout() and init_bioscon() are still there,
but will go away. init_bioscon() becomes InitConsole(), and
con_charout() is obsolete since Console_write() works now (*).
When dircon.c is initialized, it loses the current bios cursor
location, and sets the cursor to (0,0).

vt100 emulation is on the way, but currently only gotoxy, setattr (**)
and clear exist. BTW, do we need vt100, or could a simpler terminal
emulation be created? A simple terminal could be much smaller thar a full
vt100 emulation. Since all well-behaving applications must use terminfo
anyway, the emulation doesn't need to be complatible with anything.

Display scrolling when writing in the display bottom works, but could
be optimized faster.

Currently this is tested only on vga 80x25. As I don't have access
to any other adapter, this will remain the case for now. If the
cga snow-effect becomes a problem, I'll add code to check if writing
to the display memory is ok.

Should cli/sti pairs be in each function needing to be atomic
or will the kernel be completely atomic?

How about writing some doc on the vfs functions so that the driver
file_operations could be done?

I added buffering and functions for the vfs into xt_key, and renamed
the new thing to 'new_key.c'. It is still compatible with the old
one, and can be used instead of it.

(*) I think Console_write assumes that the buffer being written
 is in the kernel data segment. How otherwise could it be
 just a char * ?
 Anyway, it ignores the two first parms.

(**) Only bold( == bright ) and blinking attributes are implemented
 for now.

Saku Airila 1996