ktr: Use __cachealign to align ktr_cpu

The version of __VM_CACHELINE_ALIGN will not properly pad struct to
the cache line size.

Reviewed-by: dillon@
cachealign: Fix __VM_CACHELINE_ALIGN

With-Input-from: dillon@
jme: Cache align software TX/RX descriptor data
kernel - Use atomic op for usched_global_cpumask

* Use atomic op for usched_global_cpumask in the cpu init code.  This
  code is serialized anyway, I think, but it is best to be safe.

* Add cpu_ccfence() to ensure that the compiler does not reorder the
  clearing of the mask in the cpusync code.
acpi/pstate: Be lenient about wrong # of processors in the power domain

Some stupid BIOSes seem to consider two logic CPUs (hyperthreading) as
one CPU.  Don't bail out; just print some error messages.

Reported-by: dillon@
usb4bsd: Bring in FreeBSD's libusbhid, usbhidctl and USB kernel code.

In order to make it live peacefully along with our old USB code, name
all directories with new USB code *u4b* instead of *usb*.

This is FreeBSD SVN r231881.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Adjust header paths in libusbhid, usbhidctl, and public headers.

Also remove some __FBSDID's.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Hook the userland part into the build.

Define a new make.conf(5) variable, WANT_USB4BSD, which (if set) causes
the new USB's userland to be built (similar to WANT_NETGRAPH7).
<bus/pci/pcireg.h>: Add a definition for XHCI programming interface.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Generate usbdevs.h and usbdevs_data.h.

Also, rename devlist2h.awk to usbdevs2h.awk and remove our CVS ID in
Makefile.usbdevs.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Perform the usual porting on the controller, storage and core code.

malloc -> kmalloc, printf -> kprintf, locking, and so forth.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Hook usb, ehci, ohci, uhci, xhci, umass, and usfs into the build.

Adds some missing Makefiles and adjusts others.

With this commit, the corresponding modules all build when WANT_USB4BSD
is set, but they are not guaranteed to work. More bugs will be fixed in
subsequent commits.

The new USB code can't yet be built into the kernel.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Cleanup pass.

* Adjust indentation, whitespace and typos.

* Uniformly use #if 0 to deactivate code instead of C comments.
usb4bsd: Separate building of the old USB modules.

Don't build the old USB driver modules when WANT_USB4BSD is set.

Also, do some cleanup in some of the Makefiles, while I'm here.
usb4bsd: Bring in FreeBSD's uaudio driver.

This is based on FreeBSD SVN r231881.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Implement umass scsi probing on attach.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Fixes, fixes, fixes.

* Fix a panic when trying to free null pointer in usb_free_device.

* Fix a panic due to wrong assignment of locks.

* Fix kqueue handling.

* Add debug helpers.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Port input devices (uep, uhid, ukbd, ums) and hook into build.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
usb4bsd: Port network devices (uether, udav, axe) and hook into build.

Submitted-by: Markus Pfeiffer <markus.pfeiffer@morphism.de>
kernel/mii_layer: Little indentation fix.