Arguments for kernel_entry?

[Richard Hodges <rh@matriplex.com>]

Would anyone be able to provide information on the arguments
to kernel_entry (in head.S)?

The first two look pretty straightforward, argument count and
string vectors.  I assume that argument zero is actually the
first argument, and not "vmlinux"?

What are the third (ulong) and fourth (int *) arguments?  I have
read head.S and searched for days trying to find this info :-(

I thought PMON would be a decent reference, but run_target() only
seems to set $4 and $5, before calling _go().

Thanks!

-Richard