x86 machine/asm.h: Avoid juxtaposition for concatenation.

clang asm doesn't seem to like it. Instead of `.asciz "foo" "bar"',
do `.ascii "foo"; .asciz "bar"'.

PR toolchain/58960: Missing support for _NETBSD_REVISIONID on various
ports

branches: 1.23.2;
amd64/asm.h: Respect _NETBSD_REVISIONID.

sys/arch/amd64: remove trailing whitespace

Merge the bouyer-xenpvh branch, bringing in Xen PV drivers support under HVM
guests in GENERIC.
Xen support can be disabled at runtime with
boot -c
disable hypervisor

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

branches: 1.19.28; 1.19.38;
Indent.

branches: 1.18.2;
Pass PICFLAGS down to cc-as-as and use __PIC__ to decide if it is small
vs big PIC mode. Retire -DPIC and -DBIGPIC.

branches: 1.17.2;
Define IDTVEC_END(), from i386/asm.h.

Add END(y) as i386/asm.h does.

branches: 1.15.2;
make dtrace work on amd64.

branches: 1.14.8; 1.14.14;
Consistently use .gnu.warning with .pushsectio and .popsection on all
architectures instead of obsolete STABS frames for linker warnings.

branches: 1.13.8; 1.13.16;
put the contents of these header files around #ifdef __x86_64__, and
#include the <i386/foo.h> in the #else clause, making these files
largely bit-size independant.

Make RCSID() use section .ident like the C version and i386's asm does.
OK ad@

branches: 1.11.6; 1.11.10; 1.11.12; 1.11.16;
- Make __cpu_simple_lock and similar real functions and patch at runtime.
- Remove old x86 atomic ops.
- Drop text alignment back to 16 on i386 (really, this time).
- Minor cleanup.

branches: 1.10.2; 1.10.6;
Drop text alignment back to 16 - the usual size of blocks the instruction
decoder works with.

branches: 1.9.2;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

Merge most x86 changes from the vmlocking branch, except the threaded soft
interrupt stuff. This is mostly comprised of changes to the pmap modules to
work on multiprocessor systems without kernel_lock, and changes to speed up
tlb shootdowns.

branches: 1.7.6; 1.7.14; 1.7.18; 1.7.22; 1.7.24;
Merge newlock2 to head.

branches: 1.6.2;
Add an SPLLOWER() macro.

branches: 1.5.2; 1.5.6;
Add a STRONG_ALIAS macro

branches: 1.4.2;
merge ktrace-lwp.

branches: 1.3.16;
Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22364, verified by myself.

branches: 1.2.2;
set symbol to be a function using .type directive in IDTVEC macro
so that ddb backtrace can pick them up after recent ksyms changes.

suggested by Matt Thomas on tech-kern.
ok'ed by Frank van der Linden.

Rename the x86_64 port to amd64, as this is the actual name used for
the processor family now. x86_64 is kept as the MACHINE_ARCH value,
since it's already widely used (by e.g. the toolchain, etc), and
by other operating systems.