Don't mess with /etc/localtime if it is a symlink.
Fix loss of the emulated keyboard on Xen PV HVM domains.

xen/xenbus/xenbusb.c:
    In xenbusb_probe_children(), do not modify the XenBus state of
    devices for which we have no PV driver support. An emulated device
    we do support may share this backend.  Hide the node from XenBus
    instead.

    This prevents closing the vkbd device, which Qemu's emulated keyboard
    device is using as the source for keyboard events.

    Tested with qemu-xen-traditional, qemu-xen and qemu stubdomains, all
    working as expected.

Submitted by:	Roger Pau Monne <roger.pau@citrix.com>
Reviewed by:	gibbs
MFC after:	1 week
Don't depend on the touch binary being present.

We can simply create an empty file by doing a no-op and redirecting stdout.
Work around build breakages with GCC 4.2.

Reported by:	tinderbox
Switch to AP[2:1] access permissions model. Store "referenced"
bit in PTE.

Enable Access Flag in CPU control. With AF enabled each valid mapping
needs to have referenced bit in PTE set in order to be able to cache
it in the TLB.

AP[0] bit is to be used as reference flag.
All access permissions are encoded by AP[2:1] wherein AP[1] is in fact
"user enable" and AP[2](APX) is "write disable".

All mappings are always set to be valid. Reference emulation is performed
by setting/clearing reference flag in PTE.

md.pvh_attrs are no longer necessary however pv_flags are still being used
for now.

Marking vm_page as "dirty" or "referenced" is being performed on:
- page or flag fault servicing in pmap_fault_fixup(), basing on the fault
  type
- vm_fault servicing in pmap_enter() according to the desired protections
  and faulty access type
Redundant page marking has been removed as on ARM we know exactly when the
particular page is referenced or is going to be written.

Submitted by:	Zbigniew Bodek <zbb@semihalf.com>
Sponsored by:	The FreeBSD Foundation, Semihalf
Improve, optimize and clean-up ARMv6/v7 memory management related code.

Use pmap_find_pv if needed instead of multiplying its code throughout
pmap-v6.

Avoid possible NULL pointer dereference in pmap_enter_locked()
When trying to get m->md.pv_memattr, make sure that m != NULL,
in particular that vector_page is set to be NULL.

Do not set PGA_REFERENCED flag in pmap_enter_pv().
On ARM any new page reference will result in either entering the new
mapping by calling pmap_enter, etc. or fixing-up the existing mapping in
pmap_fault_fixup().
Therefore we set PGA_REFERENCED flag in the earlier mentioned cases and
setting it later in pmap_enter_pv() is just waste of cycles.

Delete unused pm_pdir pointer from the pmap structure.

Rearrange brackets in the fault cause detection in trap.c
Place the brackets correctly in order to see course of the conditions
instantaneously.

Unify naming in pmap-v6.c and improve style
Use naming common for whole pmap and compatible with other pmaps,
improve style where possible:
pm   -> pmap
pg   -> m
opg  -> om
*pt  -> *ptep
*pte -> *ptep
*pde -> *pdep

Submitted by:   Zbigniew Bodek <zbb@semihalf.com>
Sponsored by:   The FreeBSD Foundation, Semihalf
Stop using PVF_MOD, PVF_REF & PVF_EXEC flags in pv_entry, use PTE.

Using PVF_MOD, PVF_REF and PVF_EXEC is redundant as we can get the proper
info from PTE bits.
When the mapping is marked as executable and has been referenced we assume
that it has been executed. Similarly, when the mapping is set to be writable
and is referenced, it must have been due to write access to it.
PVF_MOD and PVF_REF flags are kept just for pmap_clearbit() usage,
to pass the information on which bit should be cleared.

Submitted by:   Zbigniew Bodek <zbb@semihalf.com>
Sponsored by:   The FreeBSD Foundation, Semihalf
Rework and organize pmap_enter_locked() function.

pmap_enter_locked() implementation was very ambiguous and confusing.
Rearrange it so that each part of the mapping creation is separated.
Avoid walking through the redundant conditions.
Extract vector_page specific PTE setup from normal PTE setting.

Submitted by:   Zbigniew Bodek <zbb@semihalf.com>
Sponsored by:   The FreeBSD Foundation, Semihalf
Fix typo in the definition of the TWS_DATA_CCB.

Submitted by:	Andreas Turriff <maillist@turriff.net>
Let iconv build on -HEAD properly.

- Add NO_WMISSING_VARIABLE_DECLARATIONS where we use Yacc/Lex.
- Add variable declarations where possible.
- Add missing static keyword.
Correct the description of the -a option: rtsol(d) -a will in fact send out
router solicitations on multiple interfaces.

Reviewed by:	hrs
MFC after:	1 week
Change the copyright notice to a standard BSD 2-clause license and assign
ownership to the FreeBSD foundation for the years this file has been in
the FreeBSD repository.

This file was originally created by Juniper as part of upgrading to FreeBSD
4.10 (which had no MIPS support) and held functions found on other machines
It grew actual functionality over time. The functionaliy was copied from
other architectures and ported to MIPS on a as-needed basis.

Approved by:	Mark Baushke (Juniper IP)
Approved by:	Megan Sugiyama (Juniper legal)
Pointed out by:	jmallett@
Requested by:	core (jhb@)
Include descriptions of the flags and fields printed when dumping the
IPv6 prefix list.

Reviewed by:	hrs
MFC after:	1 week
Add support for netgroup, based on patch in the PR but made consistent
with existing style.

PR:		bin/132692
Fix target selection logic, which did not comply with the man page.

Instead of using the file with the least order of path name components,
shortest filename and finally the shortest basename (with the search
stopping as soon as one of these conditions is true), the first filename
checked was used as the reference, and another filename was only selected
if all of the above comparisons are in favour of the latter file.

This was wrong, because filenames with path less components were only
considered, if both of the other conditions were true as well. In fact,
the first filename to be checked had good chances to be selected in the
end, since it only needed to be better with regard to any one of the
three criteria ...

Reviewed by:	delphij@freebsd.org
Use proper malloc type for ioctls white-list.

Reported by:	pho
Tested by:	pho
While waiting for the bpf hold buffer to become idle, check
the return value from mtx_sleep() and exit bpfread() on
errors such as EINTR.

Reviewed by:	jhb
Ensure alq's shutdown_pre_sync event handler is deregistered on module unload to
avoid a dangling pointer and eventual panic on system shutdown.

Reported by:	Ali <comnetboy at gmail.com>
Tested by:	Ali <comnetboy at gmail.com>
MFC after:	1 week
Initialising the new fibnum field to a known value turns out to
be a GOOD IDEA (TM).
Apparently MOST users set this (e.g. tcp and friends) but there are a few
users that just assume that it is a sensible value but then go on to read it.
These include SCTP, pf and the FLOWTABLE option (and maybe others).
The fasttrap provider cleans up probes asynchronously when a process with
USDT probes exits. This was previously done with a callout; however, it is
possible to sleep while holding the DTrace mutexes, so a panic will occur
on INVARIANTS kernels if the callout handler can't immediately acquire one
of these mutexes. This panic will be frequently triggered on systems where
a USDT-enabled program (perl, for instance) is often run.

This revision changes the fasttrap cleanup mechanism so that a dedicated
thread is used instead of a callout. The old behaviour is otherwise
preserved.

Reviewed by:	rpaulo
MFC after:	1 month