Sync with OpenBSD.

MFC after:	2 weeks
Minor style(9) cleanups

#define should be followed by a tab.

MFC after:	3 days
Remove unused variable.

PR:		173521
MFC after:	1 week
Sponsored by:	Yandex LLC
Add a missing break in the TCP case.

Reviewed by:	bms
MFC after:	1 week
Remove redundant unlock.

This code was removed from the opensolaris and darwin's
netsmb implementations, in DfBSD it also has been disabled.

PR:		36566, 87859, 139407, 161579, 175557, 178412, 186652
MFC after:	2 weeks
Sponsored by:	Yandex LLC
Add the initial version of if_nf10bmac(4), a driver to support an
NetFPGA-10G Embedded CPU Ethernet Core.

The current version operates on a simple PIO based interface connected
to a NetFPGA-10G port.

To avoid confusion: this driver operates on a CPU running on the FPGA,
e.g. BERI/mips, and is not suited for the PCI host interface.

MFC after:	1 week
Relnotes:	yes
Sponsored by:	DARPA/AFRL
Remove redundant code.

Sponsored by:	The FreeBSD Foundation
Based on xlp_machdep.c and completed the list of options based on
boot/mips/beri/loader/metadata.c allow FDT configuration to set
command line options.
This leads to an interesting quesiton of future interactions with loader.
However for configurations without loader this allows bootverbose or boot
single user to be set by compiling a new kernel, which is good enough for
testing and debugging.

Reviewed by:	rwatson
MFC after:	1 week
Remove duplicate extern declarations after r264573.
Makes things compile better.

Someone submit to:	OpenBSD
MFC after:		13 days
X-MFC with:		r264573
Stop casting the const char * to void * to char * to make compile more happy
after r264573.

Someone submit to:	OpenBSD
MFC after:	13 days
X-MFC with:	r264573
Correct AMD chipsets identification.

Submitted by:	Dmitry Luhtionov <dmitryluhtionov@gmail.com>
MFC after:	2 weeks
Fix releasing the lock in the parent atrun process after the queue
directory has been processed. Otherwise, a long-running child process
caused other atrun invocations to stall unnecessarily.
Fix typo.

MFC after:	3 days
use correct (integer) type for the temperature sysctl

Reviewed by:	np, scottl
Obtained from:	Netflix
MFC after:	3 days
Fix typo and case inconsistency in MIPS CP0 register names.

MFC after:	3 days
fcntl.h: Make visible various POSIX.1-2008 features.

Also, remove #if __BSD_VISIBLE where it is redundant. When __BSD_VISIBLE is
defined to 1, __POSIX_VISIBLE, __XSI_VISIBLE and __ISO_C_VISIBLE are also
defined to the newest supported version.

PR:		188173
Reviewed by:	pluknet
For NFS mounts using rsize,wsize=65536 over TSO enabled
network interfaces limited to 32 transmit segments, there
are two known issues.
The more serious one is that for an I/O of slightly less than 64K,
the net device driver prepends an ethernet header, resulting in a
TSO segment slightly larger than 64K. Since m_defrag() copies this
into 33 mbuf clusters, the transmit fails with EFBIG.
A tester indicated observing a similar failure using iSCSI.

The second less critical problem is that the network
device driver must copy the mbuf chain via m_defrag()
(m_collapse() is not sufficient), resulting in measurable overhead.

This patch reduces the default size of if_hw_tsomax
slightly, so that the first issue is avoided.
Fixing the second issue will require a way for the
network device driver to inform tcp_output() that it
is limited to 32 transmit segments.

Reported and tested by:	csforgeron@gmail.com, markus.gebert@hostpoint.ch
MFC after:	2 weeks
Add support for reading the PIT Counter 2 output signal via the NMI
Status and Control register at port 0x61.

Be more conservative about "catching up" callouts that were supposed
to fire in the past by skipping an interrupt if it was
scheduled too far in the past.

Restore the PIT ACPI DSDT entries and add an entry for NMISC too.

Approved by:	neel (co-mentor)
Enable and disable the PMC unit at load/unload time, respectively.

MFC after:	3 weeks
Add support for specifying USB controller mode via FDT.
Add FDT support to the DWC OTG kernel module.

Submitted by:	John Wehle <john@feith.com>
PR:		usb/188683
MFC after:	1 week