Add m_clrprotoflags() to clear protocol specific mbuf flags at up and
downwards layer crossings.

Consistently use it within IP, IPv6 and ethernet protocols.

Discussed with:	trociny, glebius
Add four additional M_PROTOFLAGS[9-12] for protocol specific use.

Discussed with:	trociny, glebius, adrian
Add entry for packages-9.2-release directory.

Approved by:	re (implicit)
Migrate the net80211 protocol specific use of M_FRAG, M_FIRSTFRAG and
M_LASTFRAG flags to protocol specific flags.

Remove the now unused M_FRAG, M_FIRSTFRAG and M_LASTFRAG mbuf flags.

Discussed with:	trociny, glebius, adrian
Reorder the mbuf defines to make more sense and group related flags
together.

Add M_FLAG_PRINTF for use with printf(9) %b indentifier.

Use the generic mbuf flags print names in the net80211 code and adjust
the protocol specific bits for their new positions.

Change SCTP M_PROTO mapping from 5 to 1 to fit within the 16bit field
they use internally to store some additional information.

Discussed with:	trociny, glebius
Simplify pv_entry removal or ARMv6/v7:

- PGA_WRITEABLE indicates that there *might be* a writable mapping for the
  particular page, so to avoid frequent sweeping of the pv_entries whenever
  pmap_nuke_pv(), pmap_modify_pv(), etc. is called, it is sufficient to
  clear that flag if there are no managed mappings for that page anymore
  (notice that only pmap_enter is authorized to set this flag).
- Avoid redundant checking for PVF_WIRED flag when this flag cannot be set
  anyway.
- Clear PGA_WRITEABLE only once for each vm_page instead of multiple,
  redundant clearing it in loop when there are no writeable mappings
  to that page anymore.

Submitted by:	Zbigniew Bodek <zbb@semihalf.com>
Reviewed by:	gber
Sponsored by:	The FreeBSD Foundation, Semihalf
Clear all L2 PTE protection bits before their configuration.

Revise L2_S_PROT_MASK to include all of the protection bits.  Notice that
clearing these bits does not always take away the corresponding permissions
(for example, permission is granted when the bit is cleared). The bits are
cleared but are to be set or left cleared accordingly in pmap_set_prot(),
pmap_enter_locked(), etc.

Clear L2_XN along with L2_S_PROT_MASK in pmap_set_prot() so that all
permissions related bits are cleared before actual configuration.

Submitted by:	Zbigniew Bodek <zbb@semihalf.com>
Reviewed by:	gber
Sponsored by:	The FreeBSD Foundation, Semihalf
Fix ARMv6/v7 mapping's wired status.

Last input argument in pmap_modify_pv() should be a mask of flags to be set.
In pmap_change_wiring() however, the straight wired status was used, which
does not represent valid flags (and is of type boolean).

This commit fixes the issue so that wired flag is passed to pmap_modify_pv()
properly.

Submitted by:	Zbigniew Bodek <zbb@semihalf.com>
Reviewed by:	gber
Sponsored by:	The FreeBSD Foundation, Semihalf
Allow UART_POLL_FREQ to be set as a kernel option as well as via tunable
(the code was already set up for this, just needs to be in conf/options).

Also, if reporting that polling is being used, report the frequency too.
Simplify and clean up pmap_clearbit()

There is no need for calling vm_page_dirty() when clearing "modified" flag as
it is already set for that page in pmap_fault_fixup() or pmap_enter() thanks
to "modified" bit emulation.

Also, there is no need for checking PTE "referenced" or "writeable" flags.  If
there is a request to clear a particular flag we should just do it.

Submitted by:	Zbigniew Bodek <zbb@semihalf.com>
Reviewed by:	gber
Sponsored by:	The FreeBSD Foundation, Semihalf
Do not use pv_kva on ARMv6/v7 and save some space on each vm_page.  It's only
relevant for older ARM variants (with virtual cache).

Submitted by:	Zbigniew Bodek <zbb@semihalf.com>
Reviewed by:	gber
Sponsored by:	The FreeBSD Foundation, Semihalf
Bump __FreeBSD_version to 1000046 after the addition of M_PROTO[9-12]
and removal of M_NOFREE|M_FRAG|M_FIRSTFRAG|M_LASTFRAG mbuf flags.
Remove incorrect 'const' qualifier from pointers to dynamic string
buffers I added in the previous commit.

Pointy hat to:	jhb
MFC after:	1 month
Subversion requires atomic functions we only support on arm with clang.
Enable VFP on the Zedboard.
 - Use an arbitrary but reasonably large import size for kva on architectures
   that don't support superpages.  This keeps the number of spans and internal
   fragmentation lower.
 - When the user asks for alignment from vmem_xalloc adjust the imported size
   by 2*align to be certain we can satisfy the allocation.  This comes at
   the expense of potential failures when the backend can't supply enough
   memory but could supply the requested size and alignment.

Sponsored by:	EMC / Isilon Storage Division