adapt to new api.
implement new api for i386 and amd64.
correct a header.
implement new api for alpha.
correct a header.
implement new api for xen.
adapt to new api.
adapt to new api.  (#if 0'ed code)
a comment.
don't bother to wrap splraiseipl and IPL_xxx with #if notyet.
revert old version of splraiseipl().
implement new api for sun2.
implement new api for sun3.
implement new api for sparc.
implement new api for sparc64.
implement new api for vax.
implement new api for evbarm.
implement new api for evbmips.
implement new api for evbsh3.
implement new api for iyonix.