Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

- Use bus_foo() rather than bus_space_foo() and retire the bus tag and handle
from the softc.
- Rework the watchdog timer to match other NIC drivers:
- Start a timer in fe_init() that runs once a second and checks a counter
in the softc that is identical to the deprecated 'if_timer'.
- Just adjust the softc tx timeout value when sending packets instead of
scheduling the timer.
- Use IFQ_SET_MAXLEN().

Tested by: WATANABE Kazuhiro

Make fe(4) MPSAFE:
- Add a mutex to the softc to protect the softc and device hardware.
- Don't leak bus resources if if_alloc() fails during attach.
- Setup the interrupt handler after calling ether_ifattach().
- Use a private timer to manage the transmit watchdog.

Tested by: WATANABE Kazuhiro CQG00620 of nifty.ne.jp

Stop embedding struct ifnet at the top of driver softcs. Instead the
struct ifnet or the layer 2 common structure it was embedded in have
been replaced with a struct ifnet pointer to be filled by a call to the
new function, if_alloc(). The layer 2 common structure is also allocated
via if_alloc() based on the interface type. It is hung off the new
struct ifnet member, if_l2com.

This change removes the size of these structures from the kernel ABI and
will allow us to better manage them as interfaces come and go.

Other changes of note:
- Struct arpcom is no longer referenced in normal interface code.
Instead the Ethernet address is accessed via the IFP2ENADDR() macro.
To enforce this ac_enaddr has been renamed to _ac_enaddr.
- The second argument to ether_ifattach is now always the mac address
from driver private storage rather than sometimes being ac_enaddr.

Reviewed by: sobomax, sam

Forced commit after moving mb86960.h from i386/isa/ic to dev/fe. It
is only used by the fe driver, and isn't MD.

don't pollute global namespace with valid_Ether_p, instead, prepend
fe_ to it.

Start each of the license/copyright comments with /*-, minor shuffle of lines

Replace the if_name and if_unit members of struct ifnet with new members
if_xname, if_dname, and if_dunit. if_xname is the name of the interface
and if_dname/unit are the driver name and instance.

This change paves the way for interface renaming and enhanced pseudo
device creation and configuration symantics.

Approved By: re (in principle)
Reviewed By: njl, imp
Tested On: i386, amd64, sparc64
Obtained From: NetBSD (if_xname)

- Newbus'ify and bus_space'ify.
- Separate bus dependent part and independent part.
- Moved source files to sys/dev/fe (repo copied).
- Fixed some comments by chi@bd.mbn.or.jp (Chiharu Shibata)

Tested by: bsd-nomads@clave.gr.jp and
FreeBSD98-testers@jp.freebsd.org