calls lcp.{Up,Down} by itself, and (2) as lmc driver uses interrupt to
get the card initialization callback lcp calls from sppp_ioctl
does not really work. for chdlc pp_{up,down} are not really necessary so
don't bother (#if 0'ed).
we can run LCP and subsequent PPP negotiation.
- suppress too noisy printf() for about AIS event (if you remove the cable,
it will bark forever).
- sppp_dequeue() can return NULL even when sppp_isempty() is false, so check
it and do not deref NULL pointer.
- sppp_flush() on LMC interface shutdown.
- prepare to change BPF type on the fly (bpf_change_type).
change DLT type to cisco HDLC, as lmc driver is hardwired to cisco HDLC
on driver attach. XXX we may need to revisit this, as if_spppsubr may want
to alter this later.
<vm/pglist.h> -> <uvm/uvm_pglist.h>
<vm/vm_inherit.h> -> <uvm/uvm_inherit.h>
<vm/vm_kern.h> -> into <uvm/uvm_extern.h>
<vm/vm_object.h> -> nothing
<vm/vm_pager.h> -> into <uvm/uvm_pager.h>
also includes a bunch of <vm/vm_page.h> include removals (due to redudancy
with <vm/vm.h>), and a scattering of other similar headers.
lukem