the only architecture dependence of devether was enabling interrupts,
which is now done at the end of the driver's reset() function now.
the wifi stack and dummy ethersink also go to port/.
do the IRQ2->IRQ9 hack for pc kernels in intrenabale(), so not
every caller of intrenable() has to be aware of it.
fix bug introduced by amd64 support:
forgot to update ring index i on receive. surprisingly
this was working until there where more than one packet
to process. sorry.
ilock the controller while processing rings. this should
be fixed and use kprocs instead.
