I believe things are passed in an array. I think the reason it is in mostly asm is because silo is a 32-bit program, and the openboot commands are expected to be sent in a 64-bit array. So normal C calling conventions don't mix.
Grub2 can be built as 64bits I think. And the less I use asm, the more easily it could be ported to other OpenFirmware (maybe OpenBot) platforms.
Just copy the p1275 command stuff from silo. It's a simple and clean interface.
Grub2 is a GNU project, so I can't copy-paste code - or, afaik, the original author would have to sign some kind of copyright assignment. That's why I would highly prefer a doc over source code.
Vincent Pelletier
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