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

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

MFC: r260050, r261528

- Switch to using the common MII bitbang'ing code instead of duplicating it.
- Based on lessons learnt with dc(4) (see r185750), add bus space barriers to
the MII bitbang read and write functions as well as to instances of page
switching.
- Add missing locking to ed_ifmedia_{upd,sts}().
- Canonicalize some messages.
- Based on actual functionality, ED_TC5299J_MII_DIROUT should be rather named
ED_TC5299J_MII_DIRIN.
- Remove unused headers.
- Use DEVMETHOD_END.
- Use NULL instead of 0 for pointers.

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

Approved by: re (implicit)

Have a function pointer to the routine to call for writing an mbuf
into the card's memory.

# this eliminates a more of the ifdef soup in if_ed and if_edvar

# I've fixed the cbus drivers, but can't test them all easily.

If I've broken anything, please let me know.

Create mediachg functions for the 3c503 and hpp cards. This is used
to properly configure the right interface to use.

Also call the mediachg function when we set flags UP and are already
running. If this were a pure ifmedia driver, we'd not need to do this
since we'd be ignoring the linkX flags.

This reduces the number of ifdefs to support sub-devices a little as a
nice side effect. It also reduces the number of hpp interfaces
exposed by 33%.

Style(9) issue: return (foo);

Transition from ALTPHYS to LINK2. We already document in the ed(4)
man page that the ifconfig option link2 is used to disable the AUI
transceiver on the 3com boards (should also say HP PC Lan+). This
makes the connection clearer.

Add a note about why we set this flag prior to attaching the device.
We never set or clear the flag later, only test it. There can be no
races here, but this might be asthetically displeasing to some. Also
note that we may no longer need to have this knob at all as we may be
able to do it with the more sophisticated rc.d scripts we have today I
think the only reason it is there is because we didn't used to allow
its proper setting when configured to get the IP address via DHCP.

I'll note that this would be better handled by using ifmedia for all
ed cards, not just those with a miibus...

Finish conversion to bus space and make ed MP safe.

o Lock ed
o Fix extra newline in probe messages
o Eliminate gone.
o Make detach less-racy.
o Eliminate spl*
o Switch from timeout/untimeout to callout interface.
o Read/write card memory using bus_space calls.
o generalize readmem so that we don't need ifs in the code.
o Fix memory stuff to be consistant.
o Remove OLDCARD compat stuff.
o Mark interrupt as MPSAFE.

# sic, hpp not tested at all
# ISA and PCI attachments lightly tested

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

Break out obscure ISA cards into their own files, as well as ne2000
and wd80x3 support. Make the obscure ISA cards optional, and add
those options to NOTES on i386 (note: the ifdef around the whole code
is for module building). Tweak pc98 ed support to include wd80x3 too.
Add goo for alpha too.

The affected cards are the 3Com 3C503, HP LAN+ and SIC (whatever that
is). I couldn't find any of these for sale on ebay, so they are
untested. If you have one of these cards, and send it to me, I'll
ensure that you have no future problems with it...

Minor cleanups as well by using functions rather than cut and paste
code for some probing operations (where the function call overhead is
lost in the noise).

Remove use of kvtop, since they aren't required anymore. This driver
needs to get its memory mapped act together, however, and use bus
space. It doesn't right now.

This reduces the size of if_ed.ko from about 51k to 33k on my laptop.