kernel: Remove unused *.h files from SRCS in kernel module Makefiles.

They were found by checking the preprocessed code of the files
in SRCS to see if the header was included at some point.

After r

kernel: Remove unused *.h files from SRCS in kernel module Makefiles.

They were found by checking the preprocessed code of the files
in SRCS to see if the header was included at some point.

After removal, the preprocessed source of a build with the old
Makefiles was compared against one with the changes (for various
kernel configurations and when building just from /usr/src) to
verify that the commit leads to no functional change.

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virtio - Get rid of config_change devmethod, treat like vq interrupts.

Build fixes.

kernel/virtio: Some cleanup (Makefiles and gcc47 warnings).

kernel -- Import virtio & virtio-block drivers.

virtio-blk provides a paravirtualized storage controller, with one
disk per virtio device.

This driver is based on Tim Bisson's port of FreeBSD's vir

kernel -- Import virtio & virtio-block drivers.

virtio-blk provides a paravirtualized storage controller, with one
disk per virtio device.

This driver is based on Tim Bisson's port of FreeBSD's virtio and
virtio-blk devices. Differences from Tim's port:

* Import all FreeBSD updates from 4/16 on.
* Remove indirect descriptor support from virtio device.
* Mark devices as D_MPSAFE; removes mplock around disk routines, they
are all correctly self-synchronized.
* Implement devstat support.
* Move I/O completion routine to threaded taskqueue.
* Do not hold target spinlock around virtqueue notify.
* Move objcache caches to kmalloc.

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