First shot at Sparc64

[Blue Swirl]

I'm adding Sparc64 support, now we get this far:
OpenBIOS for Sparc64
boot arg = 0x1ff004b8000

00000000-08000000
RAM 128 MB
Unhandled Exception 0x0000000000000000
PC = 0x000001fff0017314 NPC = 0x000001fff0017318
Stopping execution

This happens because there is no Forth dictionary, I'm using plainboot.

Forth dictionary doesn't compile:
Dumping final dictionary to 'obj-sparc64/openbios.dict'
Using source dictionary 'obj-sparc64/bootstrap.dict'
Compiling dictionary 1/2
Compiling dictionary 2/2

panic: Maximum include depth reached!
make[1]: *** [obj-sparc64/openbios.dict] Error 1

I tried 32-bit values in types.h, but that didn't help. IA64 and AMD64 have 
(u)int128_t, but I don't think Sparc64 has these.

VGA should work, but it doesn't, except for I/O port accesses. I found a bug 
in Qemu's Sparc64 implementation, udivx and mulx didn't work at all.

This patch replaces patch-24.

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[Stefan Reinauer]

* Blue Swirl  [060610 00:12]:
> panic: Maximum include depth reached!
> make[1]: *** [obj-sparc64/openbios.dict] Error 1
>
> I tried 32-bit values in types.h, but that didn't help. IA64 and AMD64 have 
> (u)int128_t, but I don't think Sparc64 has these.

Nasty, but gcc defines

__int128_t 
 __uint128_t

which should do the job. OpenFirmware needs double pointer size types...

Stefan