Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Make using the #address-cells property on the interrupt parent in device
tree parsing opt-out rather than opt-in. All FDT-based systems as well as
PowerPC systems with real Open Firmware use the CHRP-derived binding that
includes it, which makes SPARC the odd man out here. Making it opt-out
avoids astonishment on new platform bring up.

- Now that we have a working OF_printf() since r230631, use it for
implementing a simple OF_panic() that may be used during the early
cycles when panic() isn't available, yet.
- Mark cpu_{exit,shutdown}() as __dead2 as appropriate.

Add OF_getscsinitid(), a helper similar to OF_getetheraddr() but for
obtaining the initiator ID to be used for SPI controllers from the
Open Firmware device tree.

Modularize the Open Firmware client interface to allow run-time switching
of OFW access semantics, in order to allow future support for real-mode
OF access and flattened device frees. OF client interface modules are
implemented using KOBJ, in a similar way to the PPC PMAP modules.

Because we need Open Firmware to be available before mutexes can be used on
sparc64, changes are also included to allow KOBJ to be used very early in
the boot process by only using the mutex once we know it has been initialized.

Reviewed by: marius, grehan

- Re-write OF_decode_addr() with a bus-neutral approach, adding support
for nodes hanging off of Central (untested), FireHose (untested) and
PCI (tested) busses.
- Add an additional parameter to OF_decode_addr() which specifies the
index of the register bank to decode.

These should allow to eventually add support for the Z8530 hanging off of
FireHose to uart(4) and to write support for PCI-based graphics adapters.

Suggested by: tmm (back in '03)

- Make OF_getetheraddr() honour the "local-mac-address?" system config
variable. If set to "true" OF_getetheraddr() will now return the unique
MAC address stored in the "local-mac-address" property of the device's
OFW node if present and the host address/system default MAC address if
the node doesn't doesn't have such a property. If set to "false" the
host address will be returned for all devices like before this change.
This brings the behaviour of device drivers for NICs with OFW support/
FCode, i.e. dc(4) for on-board DM9102A on Sun machines, gem(4) and hme(4),
regarding "local-mac-address?" in line with NetBSD and Solaris.
The man pages of the respective drivers will be updated separately to
reflect this change.
- Remove OF_getetheraddr2() which was used as a stopgap in dc(4). Its
functionality is now part of OF_getetheraddr().

Some integrated Davicom cards in sparc64 boxes have an all zeros
MAC address in the EEPROM, and we need to get it from OpenFirmware.
This isn't very pretty but time is lacking to do this in a better
way this near 5.2-RELEASE. This is a RELENG_5_2 candidate.

Original version by: Marius Strobl <marius@alchemy.franken.de>
Tested by: Pete Bentley <pete@sorted.org>
Reviewed by: jake

Add function OF_decode_addr(). This function obtains the physical
address of the device identified by its phandle_t by traversing OFW's
device tree. The space and address returned by this function can
subsequently be passed to sparc64_fake_bustag() to construct a valid
tag and handle for use by the newbus I/O functions.

Use of this function is expected to be limited to pre-newbus access to
devices, such as consoles and keyboards.

Partially obtained from: tmm
Reviewed by: jake, jmg, tmm
SBus testing made possible by: jake
Tested with: LINT

Add support for starting and stopping cpus with ipis.
Stop the other cpus when shutting down or entering the debugger.

Submitted by: tmm

Add some OpenFirmware bus support code and definitions.