[OpenBIOS] Help with local variables

[G 3]

Hi, I am working on implementing local variable support in OpenBIOS. I have
done a lot of research on the issue, but there are a few issues I still need
help resolving.


-Does Openbios context switch when a word is called? This is when all the
registers are saved into a stack frame, so the currently executing word can
use them.


-Could someone give me a tutorial on how to add c functions to forth and
make them accessible to the interpreter. I want to be able to add words to
the dictionary and be able to use them from the command line.


- Would anyone know which register on the PowerPC would be good for using as
a stack pointer for a new local variable stack? I think r13 is free and a
possible candidate.


If anyone could give me a few pointers, it would really speed up my ability
to improve OpenBIOS.
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