alpha: Add missing barriers in cpu_switchto.

Details in comments.

PR kern/57240

XXX pullup-8
XXX pullup-9
XXX pullup-10

Use SysValue to store curlwp rather than curcpu. curlwp is acceessed
much more frequently, and this makes curlwp preemption-safe.

Missed one in last change.

Garbage-collect GET_CPUINFO; it's no longer used.

- Make the GET_CURLWP actually return curlwp, not &curlwp.
- exception_return(): Use GET_CURLWP directly, rather than a dance
acount GET_CPUINFO.
- Introduce SET_CURLWP(), to set the curlwp value.

- Make the GET_CURLWP actually return curlwp, not &curlwp.
- exception_return(): Use GET_CURLWP directly, rather than a dance
acount GET_CPUINFO.
- Introduce SET_CURLWP(), to set the curlwp value.
- Garbage-collect GET_FPCURLWP.

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The only remaining consumer of curpcb was the PROM mapping code, for if
PROM console routines are being used (only on KN8AE). We have access to
the sam information via curlwp, so use that, and elimi

The only remaining consumer of curpcb was the PROM mapping code, for if
PROM console routines are being used (only on KN8AE). We have access to
the sam information via curlwp, so use that, and eliminate the need to set
cpu_info::ci_curpcb when context switching, which saves an extra all into
PALcode.

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G/C GET_IDLE_PCB -- it hasn't been used for some time.

Fix copy & pasto in previous (to fix the build)

Mark the .ident section as mergable string section to avoid redundant
entries.

Undo; the correct fix was applied in csu/arch/alpha/crtbegin.h

Avoid stupid gcc redefinition warnings by #undef before redefine.

Add a RCSID macro for non _KERNEL use

Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constific

Do a minor cleanup of alpha (this will make applying pullups post branching
easier).
u_int{8,16,32,64}_t -> uint{*}_t
Change all old-style definitions to C89 prototypes.
Whitespace cleanup.
Constification in db_disasm.c

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Use .pushsection/.popsection for __KERNEL_RCSID/__KERNEL_COPYRIGHT.
Add an explicit .text to linux_sigcode.s

Consistently use .gnu.warning with .pushsectio and .popsection on all
architectures instead of obsolete STABS frames for linker warnings.

Merge newlock2 to head.

Add a STRONG_ALIAS macro

merge ktrace-lwp.

netbsd.org -> NetBSD.org

All "netbsd.org" is now gone from src/sys/arch.

We haven't done ECOFF for a long time; garbage-collect all the
__ELF__ #ifdefs (thus setting ELF in stone).

Disable .loc in macros for now; the new assembler is a lot more
picky about having the file number defined.

The return address register ($ra) is callee-saved, not caller-saved.

Add a WEAK_ALIAS() macro.

Implement WARN_REFERENCES().

Since libc is not ready for enabling weak symbol support yet, disable the
WEAK_ALIAS() macro for now (like cdefs.h).