[OpenBIOS] Mac OS X support

[Amadeusz Sławiński]

Seeing as there are people who want work on Max OS X (ppc) support and
to speed up their work, so they won't redundantly search for stuff which needs
to get implemented and so they can spend time on implementing it further.

There was some work done already during GSOC 2011,
which didn't get applied (due to not being finished? / missing signed-offs).

Anyway some time ago I tried to apply those patches and got Mac OS X
to start booting, you can see description and some screenshots at this address:
http://www.emaculation.com/forum/viewtopic.php?f=1&t=7047

Links to those patches with my comments here:
I tried them with latest tree, mixing some current stuff from mailing
list (mainly trying some filesystem things).

http://lists.openbios.org/pipermail/openbios/2011-August/006653.html
dummy get-key-map

http://lists.openbios.org/pipermail/openbios/2011-August/006615.html
http://lists.openbios.org/pipermail/openbios/2011-August/006616.html
http://lists.openbios.org/pipermail/openbios/2011-August/006618.html
file-system / partitioning stuff - may need some changes due to recent
patches

http://lists.openbios.org/pipermail/openbios/2011-August/006617.html
after "Call kernel!" it stops drawing to screen

http://lists.openbios.org/pipermail/openbios/2011-August/006619.html
local forth variables, I tested new implementation (from few days ago) and it also works

http://lists.openbios.org/pipermail/openbios/2011-August/006620.html
I think I stumbled upon it not booting without this one, but currently
can't reproduce

http://lists.openbios.org/pipermail/openbios/2011-August/006651.html
0 > boot cd:\\:tbxi >> openbios panic: Unexpected exception fff26500

http://lists.openbios.org/pipermail/openbios/2011-August/006623.html
for drawing apple logo (from my tests it seems badly positioned but it
may just want some other -g option to qemu)

https://lists.nongnu.org/archive/html/qemu-devel/2011-08/msg01418.html
I can confirm that it stops after "COLOR video console at 0x80000000 (800x600x32) without this

I will certainly test any new patches that appear ;)

Amadeusz