Enable radeondrm(4) on loongson to get accelerated graphics
with the RS780E chipset.

OK kettenis@, jsg@

Increase VM_PHYSSEG_MAX, necessary for systems with non-contiguous memory
(such as 2E and 3A systems).

Normalize sentinel. Use _MACHINE_*_H_ and _<ARCH>_*_H_ properly and consitently.

Discussed and okay drahn@. Okay deraadt@.

Allow mips64-based ports to override the default mips64 VM_PHYSSEG_STRAT
strategy value (BSEARCH); use BIGFIRST on loongson since there are only up
to two memory segments.

By popular demand and peer pressure, check-in work in progress work to support
the Yeelong Lemote mips-based netbook. Kernel bits only for now, needs
polishing; most of this work done during h2k9 las

By popular demand and peer pressure, check-in work in progress work to support
the Yeelong Lemote mips-based netbook. Kernel bits only for now, needs
polishing; most of this work done during h2k9 last month, although the
porting effort started earlier this year.

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