Vendor import of Bind 9.8.4-P2

Approved by:	delphij (mentor)
Sponsored by:	DK Hostmaster A/S
Vendor import of Bind 9.8.5-P1

Approved by:	delphij (mentor)
Sponsored by:	DK Hostmaster A/S
Vendor import of BIND 9.8.5-P2

Approved by:	delphij (mentor, implicit)
Sponsored by:	DK Hostmaster A/S
Tweak the imx debug console code so that it works with multiple SoCs.

Instead of hard-coding the uart register addresses for the imx51, use
a variable that defaults to the imx51 address.  When debugging another
imx-family SoC, the variable can be set early in initarm() to provide
full console/printf support for debugging early boot.
Fix typo.
After r253839, which modifies ld's behaviour to not automatically pull
in needed libraries, change libc++.so into a linker script, so it can
automatically pull in libcxxrt.so.

MFC after:	1 week
Remove duplicate definition of SPR MMCR0.

MFC after:	3 days
Fix the bootable CD:
o   We need wait a bit before attempting the root mount. The CD drives
    on HP machines (typical) go through the management controller so
    that it can be virtualized. In practice what this means is that it
    is slow to detect and attach.
o   Tell the kernel what to use as the root file system. The /etc/fstab
    trick doesn't work, because we're on the EFI-compatble file system.
Make r253899 compile.
- Reimplement $gif_interfaces as a variant of $cloned_interfaces.
  Newly-configured systems should use $cloned_interfaces.

- Call clone_{up,down}() and ifnet_rename() in rc.d/netif {start,stop}.
  ifnet_rename() now accepts an interface name list as its argument.

- Add rc.d/netif clear.  The "clear" subcommand is basically equivalent to
  "stop" but it does not call clone_down().

- Add "ifname:sticky" keyword into $cloned_interfaces.  If :sticky is
  specified, the interface will not be destroyed in rc.d/netif stop.

- Add cloned_interfaces_sticky={YES,NO}.  This variable globally sets
  :sticky keyword above for all interfaces.  The default value is NO.
  When cloned_interfaces_sticky=YES, :nosticky keyword can be used to
  override it on per interface basis.
Move the call to Job_SetPrefix() to Job_Init() so that
makefiles have had a chance to set .MAKE.JOB.PREFIX
zfs_ioc_rename should not leave the value of zc_name passed in via zc altered
on return.

MFC after:	1 week
Remove unnecessary soft busy of the page before to do vn_rdwr() in
kern_sendfile() which is unnecessary.
The page is already wired so it will not be subjected to pagefault.
The content cannot be effectively protected as it is full of races
already.
Multiple accesses to the same indexes are serialized through vn_rdwr().

Sponsored by:	EMC / Isilon storage division
Reviewed by:	alc, jeff
Tested by:	pho
Fix implicit declaration of warnx().
Regen for if_rsu.
Fixing a typo.

Approved by:	sbruno (mentor, implicit)
Remove inclusion of <sys/diskmbr.h>. We have no business knowing
anything related to MBR in this file.
The page hold mechanism is fast but it has couple of fallouts:
- It does not let pages respect the LRU policy
- It bloats the active/inactive queues of few pages

Try to avoid it as much as possible with the long-term target to
completely remove it.
Use the soft-busy mechanism to protect page content accesses during
short-term operations (like uiomove_fromphys()).

After this change only vm_fault_quick_hold_pages() is still using the
hold mechanism for page content access.
There is an additional complexity there as the quick path cannot
immediately access the page object to busy the page and the slow path
cannot however busy more than one page a time (to avoid deadlocks).

Fixing such primitive can bring to complete removal of the page hold
mechanism.

Sponsored by:	EMC / Isilon storage division
Discussed with:	alc
Reviewed by:	jeff
Tested by:	pho
Remove unused member.

Sponsored by:	EMC / Isilon storage division
Reviewed by:	alc
Tested by:	pho
 - Introduce a specific function, pmap_remove_kernel_pde, for removing
   huge pages in the kernel's address space.  This works around several
   asserts from pmap_demote_pde_locked that did not apply and gave false
   warnings.

Discovered by:	pho
Reviewed by:	alc
Sponsored by:	EMC / Isilon Storage Division