Sparse macros have moved to <machine/swiz.h>.
Fix sparse memory access so that it actually works as intended.
Tidy up sparse configuration access slightly.
work in progress and has never booted a real machine. Initial
development and testing was done using SimOS (see
http://simos.stanford.edu for details). On the SimOS simulator, this
port successfully reaches single-user mode and has been tested with
loads as high as one copy of /bin/ls :-).
Obtained from: partly from NetBSD/alpha
