drivers.

initialise_via_librm.

should, with the new build system, just be a case of writing the .c file
and dropping it in place in drivers/net.  :)

call it initialise() and place it in main.c.  :)

Make init function table name fixed; it's a static variable anyway.

only via the initialisation function table.

prefix to do it.

hooks_rm.o

of librm.

always saves 32 bits).

continually reallocating the real-mode stack.

registers returned to RM code.

Note that we can't make real-mode calls immediately after relocate_to().

Preserves alignment requested via _max_align parameter to linker.

 callback mechanism.

logic (e.g. avoiding memory regions with A20=0).