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)

Use local TLB_UNLOCKED marker instead of MTX_UNOWNED for Book-E PowerPC trap
routines.

This unbreaks Book-E build after the recent machine/mutex.h removal.

While there move tlb_*lock() prototypes to machine/tlb.h.

Submitted by: jhb

Rework BookE pmap towards multi-core support.

o Eliminate tlb0[] (a s/w copy of TLB0)
- The table contents cannot be maintained reliably in multiple MMU
environments, where asynchronous events (invalidations from other cores)
can change our local TLB0 contents underneath.
- Simplify and optimize TLB flushing: system wide invalidations are
performed using tlbivax instruction (propagates to other cores), for
local MMU invalidations a new optimized routine (assembly) is introduced.

o Improve and simplify TID allocation and management.
- Let each core keep track of its TID allocations.
- Simplify TID recycling, eliminate dead code.
- Drop the now unused powerpc/booke/support.S file.

o Improve page tables management logic.

o Simplify TLB1 manipulation routines.

o Other improvements and polishing.

Obtained from: Freescale, Semihalf

Rework and extend PowerPC headers definitons towards Book-E/e500 CPUs support.

Approved by: cognet (mentor)
Obtained from: Juniper, Semihalf
MFp4: e500