Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

Import ACPICA 20090521.

Dike out WARNS from kernel module makefiles. Kernels and modules
use a different mechanism for setting warning flags, and using
WARNS here only has null or negative effects.

Submitted by: bde (I think it means "submitted")

Change a directory layout for pc98.
- Move MD files into <arch>/<arch>.
- Move bus dependent files into <arch>/<bus>.
Rename some files to more suitable names.

Repo-copied by: peter
Discussed with: imp

Let kmod.mk touch opt_*.h files as needed.

Inspired by: imp's email

Fix the alpha (and others) module build by only building fdc_acpi.c on
i386 and amd64. The only other ACPI machine (ia64) doesn't support
floppy drives. Tested by: make MACHINE={pc98,i386,amd64,alpha,sparc64}

Add fdc_acpi to module build, bump WARNS to 2.

- Merged from sys/dev/fdc/fdc.c revision 1.275.
- Break out the cbus front end from fd.c.
- Remove the pccard support because it was broken.

Break out the isa and pccard front ends from fdc. This is the first
step in making this driver more attachment neutral. Others plan on
adding acpi front ends.

Still need to cleanup the MI part of the driver because it isn't as
bus independent as it could be.

Move to generating pccarddevs.h on the fly, both for the kernel and
the modules.

Also generate usbdevs.h automatically now, but a non-kernel file is
stopping that at the moment.

Unbreak the fdc module build after the repocopy of sys/isa/fd.c to
sys/dev/fdc/fdc.c.

Move adding -DPC98 to CFLAGS from each modules to sys/modules/Makefile.inc.

Drop <bsd.man.mk> support from <bsd.kmod.mk>.

Not objected to by: -current

Added pc98 support.

Two more "oops"es here: i didn't mean to turn on fdc debugging by
default in the KLD, and to turn off pccard support, so reverse each of
the flags. Also, the flags should be overridable by /etc/make.conf.

Duh-oh! When beautifying a comment right before my last commit, i
didn't realize that make considers a comment with just leading white
space only an ``unassociated shell command''.

First stab at fixing resource deallocation, and implementing fdc(4) as
a KLD. Still doesn't work well except in the PCMCIA case (now if only
pccardd(8) could load and unload drivers dynamically...). Mainly, it
tries to find fdc0 on the PCI bus for whatever obscure reasons, but i
need someone who understands driver(9) to fix this. However, it's at least
already better than before, and i'm tired of maintaining too many private
changes in my tree, given the large patches bde submitted. :)

Idea of a KLD triggered by: Michael Reifenberger <root@nihil.plaut.de>