- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Add missing const.

- Add sys_tick and the USIII and beyond sys_tick_cmpr to state_regs[].
- Const'ify and static'ize as appropriate.
- Use __FBSDID().

/* -> /*- for license, minor formatting changes

The abs() function isn't defined locally; include a header file that
defines it.

- GC a few more hand-rolled 'abs' macros.
- GC a few hand-rolled min()/max() macros while I'm here.

De-K&R.

Print the correct v9 opcodes.

Submitted by: tmm

Define our own version of abs now that we compile with -ffreestanding by
default.

Add code to emulate unimplemented (non-fp) instructions and to fixup
unaligned accesses, and instr.h, which contrains definitions for the
sparc64 instruction set (partly from NetBSD).
Make use of some definitions from instr.h in db_disasm.c.

Flesh out the sparc64 port considerably. This contains:
- mostly complete kernel pmap support, and tested but currently turned
off userland pmap support
- low level assembly language trap, context switching and support code
- fully implemented atomic.h and supporting cpufunc.h
- some support for kernel debugging with ddb
- various header tweaks and filling out of machine dependent structures