Fix a leak of the wired pages when unwiring of the PROT_NONE-mapped
wired region. Rework the handling of unwire to do the it in batch,
both at pmap and object level.

All commits below are by alc.

MFC r268327:
Introduce pmap_unwire().

MFC r268591:
Implement pmap_unwire() for powerpc.

MFC r268776:
Implement pmap_unwire() for arm.

MFC r268806:
pmap_unwire(9) man page.

MFC r269134:
When unwiring a region of an address space, do not assume that the
underlying physical pages are mapped by the pmap. This fixes a leak
of the wired pages on the unwiring of the region mapped with no access
allowed.

MFC r269339:
In the implementation of the new function pmap_unwire(), the call to
MOEA64_PVO_TO_PTE() must be performed before any changes are made to the
PVO. Otherwise, MOEA64_PVO_TO_PTE() will panic.

MFC r269365:
Correct a long-standing problem in moea{,64}_pvo_enter() that was revealed
by the combination of r268591 and r269134: When we attempt to add the
wired attribute to an existing mapping, moea{,64}_pvo_enter() do nothing.
(They only set the wired attribute on newly created mappings.)

MFC r269433:
Handle wiring failures in vm_map_wire() with the new functions
pmap_unwire() and vm_object_unwire().
Retire vm_fault_{un,}wire(), since they are no longer used.

MFC r269438:
Rewrite a loop in vm_map_wire() so that gcc doesn't think that the variable
"rv" is uninitialized.

MFC r269485:
Retire pmap_change_wiring().

Reviewed by: alc

Update an assertion to reflect the changes made in r270439. This is a
direct commit to stable/10 because ia64 is no longer supported by HEAD.

Reported by: marcel
Sponsored by: EMC / Isilon Storage Division

Merge the changes to pmap_enter(9) for sleep-less operation (requested
by flag). The ia64 pmap.c changes are direct commit, since ia64 is
removed on head.

MFC r269368 (by alc):
Retire PVO_EXECUTABLE.

MFC r269728:
Change pmap_enter(9) interface to take flags parameter and superpage
mapping size (currently unused).

MFC r269759 (by alc):
Update the text of a KASSERT() to reflect the changes in r269728.

MFC r269822 (by alc):
Change {_,}pmap_allocpte() so that they look for the flag
PMAP_ENTER_NOSLEEP instead of M_NOWAIT/M_WAITOK when deciding whether
to sleep on page table page allocation.

MFC r270151 (by alc):
Replace KASSERT that no PV list locks are held with a conditional
unlock.

Reviewed by: alc
Approved by: re (gjb)
Sponsored by: The FreeBSD Foundation

MFC r263815, r263872:

Move ia64 efi.h to sys in preparation for amd64 UEFI support

Prototypes specific to ia64 have been left in this file for now, under
__ia64__, rather than moving them to a new header under sys/ia64.
I anticipate that (some of) the corresponding functions will be shared
by the amd64, arm64, i386, and ia64 architectures, and we can adjust
this as EFI support on other than ia64 continues to develop.

Fix missed efi.h header change in r263815

Sponsored by: The FreeBSD Foundation

MFC r263380 & r268185: Add KTR events for the PMAP interface functions.

MFC r257484: Change PAL_PTCE_INFO related variables.

MFC r257477: Purge the translation cache of APs before we unleash them.

MFC r260914:
In pmap_set_pte(), make sure to enforce ordering by inserting a memory fence.

MFC r259244:
Allow pmap_remove_pages() to be called for physical maps not
associated with the current thread.

Fix a leak of the wired pages when unwiring of the PROT_NONE-mapped
wired region. Rework the handling of unwire to do the it in batch,
both at pmap and object level.

All commits below are by alc.

MFC r268327:
Introduce pmap_unwire().

MFC r268591:
Implement pmap_unwire() for powerpc.

MFC r268776:
Implement pmap_unwire() for arm.

MFC r268806:
pmap_unwire(9) man page.

MFC r269134:
When unwiring a region of an address space, do not assume that the
underlying physical pages are mapped by the pmap. This fixes a leak
of the wired pages on the unwiring of the region mapped with no access
allowed.

MFC r269339:
In the implementation of the new function pmap_unwire(), the call to
MOEA64_PVO_TO_PTE() must be performed before any changes are made to the
PVO. Otherwise, MOEA64_PVO_TO_PTE() will panic.

MFC r269365:
Correct a long-standing problem in moea{,64}_pvo_enter() that was revealed
by the combination of r268591 and r269134: When we attempt to add the
wired attribute to an existing mapping, moea{,64}_pvo_enter() do nothing.
(They only set the wired attribute on newly created mappings.)

MFC r269433:
Handle wiring failures in vm_map_wire() with the new functions
pmap_unwire() and vm_object_unwire().
Retire vm_fault_{un,}wire(), since they are no longer used.

MFC r269438:
Rewrite a loop in vm_map_wire() so that gcc doesn't think that the variable
"rv" is uninitialized.

MFC r269485:
Retire pmap_change_wiring().

Reviewed by: alc

Update an assertion to reflect the changes made in r270439. This is a
direct commit to stable/10 because ia64 is no longer supported by HEAD.

Reported by: marcel
Sponsored by: EMC / Isilon Storage Division

Merge the changes to pmap_enter(9) for sleep-less operation (requested
by flag). The ia64 pmap.c changes are direct commit, since ia64 is
removed on head.

MFC r269368 (by alc):
Retire PVO_EXECUTABLE.

MFC r269728:
Change pmap_enter(9) interface to take flags parameter and superpage
mapping size (currently unused).

MFC r269759 (by alc):
Update the text of a KASSERT() to reflect the changes in r269728.

MFC r269822 (by alc):
Change {_,}pmap_allocpte() so that they look for the flag
PMAP_ENTER_NOSLEEP instead of M_NOWAIT/M_WAITOK when deciding whether
to sleep on page table page allocation.

MFC r270151 (by alc):
Replace KASSERT that no PV list locks are held with a conditional
unlock.

Reviewed by: alc
Approved by: re (gjb)
Sponsored by: The FreeBSD Foundation

MFC r263815, r263872:

Move ia64 efi.h to sys in preparation for amd64 UEFI support

Prototypes specific to ia64 have been left in this file for now, under
__ia64__, rather than moving them to a new header under sys/ia64.
I anticipate that (some of) the corresponding functions will be shared
by the amd64, arm64, i386, and ia64 architectures, and we can adjust
this as EFI support on other than ia64 continues to develop.

Fix missed efi.h header change in r263815

Sponsored by: The FreeBSD Foundation

MFC r263380 & r268185: Add KTR events for the PMAP interface functions.

MFC r257484: Change PAL_PTCE_INFO related variables.

MFC r257477: Purge the translation cache of APs before we unleash them.

MFC r260914:
In pmap_set_pte(), make sure to enforce ordering by inserting a memory fence.

MFC r259244:
Allow pmap_remove_pages() to be called for physical maps not
associated with the current thread.