Import dma 89702b7f14 (2013-02-13) into vendors
Add basic cpu frequency control and temperature monitoring to imx6_anatop.

The temperature monitor device is enabled to sample the die temperature at
16hz.  The temperature is published via sysctl.  A callout routine at 10hz
monitors the temperature and throttles back the cpu if the temperature
goes over a user-settable throttle point (by default 10C less than the
critical high-point temperature for the chip).  The hardware is supposed
to be able to deliver an interrupt when the temperature exceeds a settable
limit, but the interrupt never arrives so for now a callout does the job.

At attach time we read the maximum cpu frequency the chip is allowed to run
at and the cpu is set to run at that speed.  It's reported at attach time.
A sysctl variable reports the current speed when queried.

New sysctl values:

  dev.imx6_anatop.0.cpu_mhz: 984
  dev.imx6_anatop.0.temperature: 37.9C
  dev.imx6_anatop.0.throttle_temperature: 95.0C

Steven Lawrance did the initial heavy lifting on this, but I changed
enough stuff that I'm the one to blame if anything breaks.

Submitted by:	Steven Lawrance <stl@koffein.net>
Add support for x2APIC virtualization assist in Intel VT-x.

The vlapic.ops handler 'enable_x2apic_mode' is called when the vlapic mode
is switched to x2APIC. The VT-x implementation of this handler turns off the
APIC-access virtualization and enables the x2APIC virtualization in the VMCS.

The x2APIC virtualization is done by allowing guest read access to a subset
of MSRs in the x2APIC range. In non-root operation the processor will satisfy
an 'rdmsr' access to these MSRs by reading from the virtual APIC page instead.

The guest is also given write access to TPR, EOI and SELF_IPI MSRs which
get special treatment in non-root operation. This is documented in the
Intel SDM section titled "Virtualizing MSR-Based APIC Accesses".

Enforce that APIC-write and APIC-access VM-exits are handled only if
APIC-access virtualization is enabled. The one exception to this is
SELF_IPI virtualization which may result in an APIC-write VM-exit.
Import Dragonfly Mail Agent into base system

It is a small and lightweight Mail Transport Agent.
It accepts mails from locally installed Mail User Agents (MUA) and delivers the
mails either locally or to a remote destination. Remote delivery includes
several features like TLS/SSL support, SMTP authentication and NULLCLIENT.

Make dma conditional to new WITHOUT_DMA option and make it respect WITHOUT_MAIL

Reviewed by:	peter
Discussed with:	emaste, bz, peter
Regen after addition of WITHOUT_DMA
Add dma-mbox-create forgotten in the previous commit
Fix typo
Enforce mail user and group
Explain how and where kern.cam.ada.write_cache can be set in practical
situations.

Reviewed by:	hrs
Approved by:	mav
Fix build with gcc
Match the correct variable to the variable description.

PR:		121173
Submitted by:	Thomas Mueller <tmueller at sysgo.com>
MFC after:	1 week
Lower warning level when built with gcc
Fix build on i386
Pull in r197521 from upstream clang trunk (by rdivacky):

  Use the integrated assembler by default on FreeBSD/ppc and ppc64.

Requested by:	jhibbits
MFC after:	1 month
X-MFC-With:	r261991
Install a default configuration file for dma

Suggested by:	flo
Fix a race between kern_proc_{o,}filedesc_out and fdescfree leading
to use-after-free.

fdescfree proceeds to free file pointers once fd_refcnt reaches 0, but
kern_proc_{o,}filedesc_out only checked for hold count.

MFC after:	3 days
Move the part in bsd.own.mk that sets -Wno-c++11-extensions for clang to
bsd.sys.mk, where it really belongs.  This also causes the flag to get
added when clang is *not* the default system compiler, but is still
used, e.g. by setting WITH_CLANG_IS_CC manually.

MFC after:	3 days
Fix virtio spec URL.

Submitted by:	lwhsu
MFC after:	1 week
Update serf-1.3.0 -> 1.3.4 - fixes multiple issues (see the CHANGES file)
including an SSL issue that turned up in the cluster with svn-1.8.8.
Print a backtrace if the SDT(9) stub gets called so that there's at least
some hope of figuring out how it happened.

Suggested by:	rstone
MFC after:	1 week