provide pmap_wired_count macro.

Give the kernel/local pmaps actual storage.

That way friendly neighborhood macros won't go scribbling
in the wrong places.

branches: 1.6.18; 1.6.36;
Fix snafu in previous -- if your test it flawed, it doesn't matter
how many times you pass.

Reinstate the blanket pmap.h for archs which do not conform to the
kernel ABI (i.e. not i386 or amd64). Due to the "half function,
half macro, all noodles" nature of pmap.h, it's too entangling and
too brittle to keep up with an ifdeffy MI implementation.

branches: 1.4.4; 1.4.6;
Add a few MD ifdefs into the rump pmap stubs to enable us to get
rid of the local pmap.h and unify the pmap ABI with the kernel.
(XXX: compiles but doesn't work on vax)

Thanks once again to Greg Oster for helping with testbuilds.

Make pmap_kernel() a MI macro for struct pmap *kernel_pmap_ptr,
which is now the "API" provided by the pmap module. pmap_kernel()
remains as the syntactic sugar.

Bonus cosmetics round: move all the pmap_t pointer typedefs into
uvm_pmap.h.

Thanks to Greg Oster for providing cpu muscle for doing test builds.

branches: 1.2.2;
Add support bits necessary for rumpnet functionality.

branches: 1.1.2; 1.1.4; 1.1.8; 1.1.14; 1.1.30; 1.1.34; 1.1.40; 1.1.42;
Introduce RUMPs - Runnable Userspace Meta-Programs

/sys/rump contains programs which run unmodified kernel code in an
emulated userspace environment. The kernel environment is provided
by librump. Currently supported are a number of file systems,
which by using puffs integrate seamlessly into the system and
provide a similar user experience to if the code was running as
part of the kernel. Potential future rumpification targets include
for example parts of the networking stack and some device drivers.

This work was supported by Google Summer of Code 2007.