Ansify pxe_netif_close() and {,pxe}socktodesc()

To appease the clang 15 warning -Wdeprecated-non-prototype (turned on
by -Wall). ok millert@

Sync no-argument function declaration and definition by adding (void).
ok mlarkin@ deraadt@

Kill the remaining <netinet/in_systm.h> inclusion!

We don't want to pass the PXE MAC address to the kernel when booting
from a local disk, since the MAC address causes the kernel to look for
root on NFS. Do this by remembering (not adding to boot ar

We don't want to pass the PXE MAC address to the kernel when booting
from a local disk, since the MAC address causes the kernel to look for
root on NFS. Do this by remembering (not adding to boot arguments) the
MAC address when opening the PXE device, and clearing this if we happen
to load a file off a non-network disk.

"works as advertised for me" todd@;
"stop sitting on this/no objections" deraadt@

show more ...

push a BOOTARG_BOOTMAC (what PXE says is the MAC address of the interface
we are booting from) out towards the kernel; tested by reyk
crank the version too

Only use bangpxe calling on PXE 2.1 and above. Makes no difference on
current-spec PXE systems, but allows some older ones (I tested 0.98 and
0.99) to get a bit further.

ok weingart@; "please get i

Only use bangpxe calling on PXE 2.1 and above. Makes no difference on
current-spec PXE systems, but allows some older ones (I tested 0.98 and
0.99) to get a bit further.

ok weingart@; "please get it in" deraadt@.

show more ...

KNF

Enter pxeboot, derived from the NetBSD implementation. Initially
intended to support network installs using bsd.rd over TFTP.

Thanks to the many who tested, including Diana Eichert.

ok deraadt@