On x86 Linux boxes I've been able to access the memory on PCI cards from
user space by mmap()'ing the right region of /dev/kmem.

Can I do this on NetBSD on a KA655?  I want to access the CSR, etc. of
a Qbus card from user space.  I'd just try it, but I have no idea where
the Qbus I/O page (bus addresses 17 760 000 to 17 777 777) is mapped in
the VAX kernel virtual address space (or VAX physical address space, for
that matter).

Thanks!
Eric