FIXME: These should be dynamically obtained from a terminal.

[Vincent Pelletier <subdino2004@yahoo.fr>]

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I'm trying to fix that thing.
I'm only working on the i386 part, because I have no ppc.

Here is how I plan to do it (almost done, but I have some questions) :

- -add an asm function to get the current vga mode without changing it (or
maybe a global var to keep the current vga mode)
- -add a field in struct grub_term
- -implement this function in different terminal handlers
- -implement grub_getwh
- -redefine GRUB_TERM_WIDTH & GRUB_TERM_HEIGHT macros to use grub_getwh

Here are my questions :
Should we foresee, in vga mode, that the user might someday choose his
vga mode ?
Should we redefine all the macros we use to draw the menu to be less
intensive on grub_getwh ?

In the attached patch, the vga function is disabled, because for now the
asm function does not work (returns always 0). As I'm really not
familiar with x86 asm, I think I had something wrong adapting from
grub_vga_set_mode.

nb: I only give the patch as draft, a preview of what I'm working on.

Vincent Pelletier
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