easily from struct buffer.

refer to data outside of our data or stack segments.

addresses.  This will have to be reworked to use physical addresses thanks
to the PXE spec.

nic.c in http.c

to nic.c

initial device, and will also allow for e.g. a device menu to be presented
to the user.

Change from using #if to #ifdef, since #if can't cope with string
constants.