Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Include machine/acle-compat.h in cdefs.h on arm if the compiler doesn't
have ACLE support built in. The ACLE (ARM C Language Extensions) defines
a set of standardized symbols which indicate the architecture version and
features available. ACLE support is built in to modern compilers (both
clang and gcc), but absent from gcc prior to 4.4.

ARM (the company) provides the acle-compat.h header file to define the
right symbols for older versions of gcc. Basically, acle-compat.h does
for arm about the same thing cdefs.h does for freebsd: defines
standardized macros that work no matter which compiler you use. If ARM
hadn't provided this file we would have ended up with a big #ifdef __arm__
section in cdefs.h with our own compatibility shims.

Remove #include <machine/acle-compat.h> from the zillion other places (an
ever-growing list) that it appears. Since style(9) requires sys/types.h
or sys/param.h early in the include list, and both of those lead to
including cdefs.h, only a couple special cases still need to include
acle-compat.h directly.

Loves it: imp

Limit arm_base_bs_tag to ARMv4 and ARMv5, we only used it in one place in
armv6 and that can use fdtbus_bs_tag.

Remove trailing whitespace from sys/arm/arm

Move the __aligned() declaration to where it will actually do something.

Micro-optimize the new arm inline bus_space implementation by grouping all
the data the inline functions access together at the start of the bus_space
struct. The start-of part isn't so important, it's the grouping-together
that's the point: now all the most-accessed data should be in one cache line.

Suggested by: cognet

The versatile platform had two copies of a bus_space that are essentially
duplicates of the standard arm base bus_space, so just use it.

Rename bus_space-v6.c to bus_space_base.c, because it's not v6-specific
and now some v5 Marvell systems are using it. Only define fdt_bus_tag
if option FDT is defined.

Move bs_unimplemented() to bus_space_generic.c so it can be shared.

For some reason, all the arm bus_space functions that work with uint16
values have armv4 in the name. There's nothing armv4-special about them,
so just use the same sort of names as all the other functions.

Use arm/bus_space-v6.c for all armv6 systems, the essentially identical
files for lpc and xilinx aren't needed. Also, fix a couple paste-os.

Use the explicit member initializer style to init the bus_space struct.
Fill in some formerly NULL members where the implementation function
exists. Add a dummy function that panics and use it as a placeholder
for thigns that are still unimplemented. Remove a few unused includes.

Add inline implementations of arm bus_space_read/write_N().

Reviewed by: cognet

Correct license statements to reflect the fact that these files were all
derived from sys/arm/mv/bus_space.c.

Approved by: core

Add common bus_space tag definition shared for most supported ARMv6/v7 SoCs.

Tested by: ian, ray