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

Quote variable for architectures where we have more than
one linuxulator (32/64bit) and as such may have a space
between both linuxulator locations.

Noticed by: Miltiadis Margaronis <mmargaron@gmail.com>
Tested by: Miltiadis Margaronis <mmargaron@gmail.com>

- Update config to doxygen 1.5.2 (I use this with 1.5.9).
- Add linprocfs and linsysfs to the linuxulator dox.
- Take the generated includes from the .m files from a subdirectory
instead of putting everything into $(.OBJDIR). This imporves the
human readbility of the source directory contents a lot, if you do not
create a separate OBJDIR.
- Assume UTF-8 encoding for every input file.
- Strip the source and dest path from the output, we are not interested
in the absolute location on the machine where the docs are created,
relative the the root of the FreeBSD source is what interests us.
- Exclude .svn directories.
- Switch to alphabetic index.
- Use one line per INCLUDE_PATH member in the common dox-config.
- Bump the __FreeBSD__ version to 9. [MFC: to 8]
- Switch from hardcoded .m files to an run-time generated one. Takes
a little bit more time to get started with actual work, but at least
is more future-proof. If you generate dox for all subsystems, the
time to find all .m files in the source is magnitutes lower than
producing the docs.
- Make the *DEST_PATH overidable from the environment. This allows to
produce the output directly in the docroot of a webserver.
- Fix the path when telling the user where he can find the API docs.

MFC after: 1 month (after 8.0)

- Chase for crypto_if.m -> crytpodev_if.m rename in order to
fix doxygen generation.
- Add some missing *_if.m files.

Approved by: re (hrs)

ah_if.m was removed a while ago

Fix build when .CURDIR != .OBJDIR.

Noticed by: "Alexander Mogilny" <sg@astral.ntu-kpi.kiev.ua>

Add (missing) and remove (obsolete) .m files.

Forced commit to note repo copy from sys/doc.

Requested by: trhodes
Repo copy by: simon

Add a disclaimer regarding public/internal functions to every subsystem for
now.

Discussed on: cvs-all
Helped with the wording: "Ben Kaduk" <minimarmot@gmail.com>

This is the kernel subsystem API documentation generation framework.

It uses doxygen to generate the API documentation. For each subsystem
a very small (about 20 lines with comments) subsystem specific Doxyfile
has to be written (have a look at the README for more). All common doxygen
options are specified in a separate file.

The framework is configured to not only generate the HTML version, but also
a PDF version (the paper size is hardcoded to DIN A4 currently and depending
on the subsystem you have to increase some limits in the latex configuration
of your system, the README tells more about this).

It also allows cross-references between the subsystems (it generates doxygen
tag files).

Currently the docs are generated in OBJDIR, but this may change after
coordination with doc@. The makefile is prepared to generate/move various
parts of the generated docs to different destinations.

TARGET_ARCH is respected and some env-vars are set for architecture specific
handling of the source (the README tells more).

Subsystems for which docs are generated:
- cam - crypto - dev_pci
- dev_sound - dev_usb - geom
- i4b - kern - libkern
- linux - net80211 - netgraph
- netinet - netinet6 - netipsec
- opencrypto - vm

Requested by: gnn