[SqNOS] Monticello update: OpenFirmware "Hello World" primitive

[Gerardo Richarte]

Name: SqueakNOS-gera.48
Author: gera
Time: 19 September 2008, 8:39:36 am
UUID: 9c80063b-ef62-4ade-bf00-ee8882844db4
Ancestors: SqueakNOS-gera.47

"Hello World" primitive for testing OpenFirmware callout mechanism. This
is a hardcoded callout, next step (tomorrow maybe) will be to make it
generic, accepting an array. That's enough to use any service provided
by OpenFirmware (OFW).