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)

- Add a private timer to drive the transmit watchdog instead of using
if_watchdog and if_timer.
- Fix some issues in detach for sn(4), ste(4), and ti(4). Primarily this
means calling ether_ifdetach() before anything else.

Use the bus_*() routines rather than bus_space_*() for register operations.

Spell "destroy" correctly.

Diff reduction to my tree: commit the trivial part of efforts to add
support for the really old Megahertz ethernet/modem combo cards.

Add support for Farallon EtherMAC PC Card.
Move ethernet MAC address setting into pccard attachment
Fix panic from IFP2ENADDR() use prior to if_alloc
Remove OLDCARD compat support. This should work still on oldcard, however.
sn_attach now requires that the resources be activated now, so adjust.

Approved by: re (scottl)

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

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

Make sn MPSAFE. This has survived a couple of make buildworlds with
my Megahertz XJ10BT.

Convert to bus_space.
Make the pccard attachment work with NEWCARD
Start locking of the driver, but only the macros are defined right now

Tested on: Megahertz CC10BT/2
# (These cards are very popular on ebay these days, and run < $10 including
# shipping from some sellers).

Add isa support:
o write isa driver routines.
o factor detach routine in sn_detach.

Don't execute MAC address initialization for non-pccard sn devices.

Newbusify the driver.

Add support, kinda, for megaheartz xjack nic cards. This support
works well for one machine per ethernet segment because it hard codes
the MAC address. The pccardd in -current doesn't have support to
parse the ethernet address from the CIS in the funky way that the
megaheartz card does things (it includes it in the info tuple, as
ascii, which is non-standard). I'd rather kludge this for the moment
and work to read the CIS from the kernel rather than mess with
pccardd.

The isa attachment is untested. The pccard attachment is known to
work since I'm committing over it.

Card Obtained from: Chris D. Faulhaber <jedger@fxp.org>