Fix loader's ability to read the 10.1 release PowerPC ISOs. There appears to
be some kind of problem with the version of makefs used for these disks.
There may be a better way to handle this problem, so I've set the MFC
timer for a fairly long time period.

MFC after:	2 weeks
Use BINUTILS_BOOTSTRAP knob for binutils only

Previously it also disabled building elftoolchain bootstrap tools such as
strip(1).

Differential Revision:	https://reviews.freebsd.org/D1398
Reviewed by:	imp
Sponsored by:	The FreeBSD Foundation
Import libcxxrt master 00bc29eb6513624824a6d7db2ebc768a4216a604.

Interesting fixes:
76584a0  Reorganize code to use only 32bit atomic ops for 32bit platforms
30d2ae5  Implement __cxa_throw_bad_array_new_length

Reviewed by:	bapt
MFC after:	1 month
Differential Revision: https://reviews.freebsd.org/D1390
Move the explanation for examples before the example itself.  Add
numerous QEMU examples and explanations supplied by sbruno, with thanks
to Ingo Schwarze for help with the mdoc markup.  Code, text, testing,
proofreading, cinematography, stunts, and the haunting theme song
supplied by sbruno.

Submitted by:	sbruno
Reviewed by:	sbruno
MFC after:	1 week
Convert vfs hash lock from a mutex to an rwlock.
Convert nullfs hash lock from a mutex to an rwlock.
Remove the svn:executable property from iscsi.4.

PR:		196380
Submitted by:	Trond.Endrestol@ximalas.info
MFC after:	1 week
Check for multiplication integer overflow in CHECK_EHDR

The initial fix in r276374 is valid only for 64-bit objects. Revert it
and return an error in CHECK_EHDR if the multiplication would overflow.

The original buffer overflow issue was found with the security/afl
fuzzer and has upstream elftoolchain ticket 462. The 32-bit object issue
with r276374 found by antoine@ during an i386 exp-run.

Sponsored by:	The FreeBSD Foundation
Replace bhyve's minimal RTC emulation with a fully featured one in vmm.ko.

The new RTC emulation supports all interrupt modes: periodic, update ended
and alarm. It is also capable of maintaining the date/time and NVRAM contents
across virtual machine reset. Also, the date/time fields can now be modified
by the guest.

Since bhyve now emulates both the PIT and the RTC there is no need for
"Legacy Replacement Routing" in the HPET so get rid of it.

The RTC device state can be inspected via bhyvectl as follows:
bhyvectl --vm=vm --get-rtc-time
bhyvectl --vm=vm --set-rtc-time=<unix_time_secs>
bhyvectl --vm=vm --rtc-nvram-offset=<offset> --get-rtc-nvram
bhyvectl --vm=vm --rtc-nvram-offset=<offset> --set-rtc-nvram=<value>

Reviewed by:	tychon
Discussed with:	grehan
Differential Revision:	https://reviews.freebsd.org/D1385
MFC after:	2 weeks
Expect access_test:access_inval to fail before __FreeBSD_version == 1100033

This will allow me to MFC the test, as jilles@ requested that I don't MFC the
access(2) KBI change to 10-STABLE in r271655
Initialize all fields of 'struct vm_exception exception' before passing it to
vm_inject_exception(). This fixes the issue that 'exception.cpuid' is
uninitialized when calling 'vm_inject_exception()'.

However, in practice this change is a no-op because vm_inject_exception()
does not use 'exception.cpuid' for anything.

Reported by:    Coverity Scan
CID:            1261297
MFC after:      3 days
The physical memory allocator supports the use of distinct free lists for
managing pages from different address ranges.  Generally speaking, this
feature is used to increase the likelihood that physical pages are
available that can meet special DMA requirements or can be accessed through
a limited-coverage direct mapping (e.g., MIPS).  However, prior to this
change, the configuration of the free lists was static, i.e., it was
determined at compile time.  Consequentally, free lists could be created
for address ranges that held no actual pages, for example, on 32-bit MIPS-
based systems with 512 MB or less of physical memory.  This change makes
the creation of the free lists dynamic, i.e., it is based on the available
physical memory at boot time.

On 64-bit x86-based systems with 64 GB or more of physical memory, create
free lists for managing pages with physical addresses below 4 GB.  This
change is to address reported problems with initializing devices that
require the allocation of physical pages below 4 GB on some systems with
128 GB or more of physical memory.

PR:		185727
Differential Revision:	https://reviews.freebsd.org/D1274
Reviewed by:	jhb, kib
MFC after:	3 weeks
Sponsored by:	EMC / Isilon Storage Division