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

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 r258002, r258024, r258027, r258051, r258052, r258243, r258244, r258002,
r258024, r258027, r258051, r258052, r258243,

Follow up r223485, which made AIM use the ABI thread pointer instead of
PCPU fields for curthread, by doing the same to Book-E.

Use the same implementation of copyinout.c for both AIM and Book-E.

Actually add IOMMU domain to the list of known mappings.

Following the approach with ACPI DMAR on x86, split IOMMU handling into
a variant PCI bus instead of trying to shoehorn it into the PCI host bridge
adapter.

Make sure that TLB1 mappings are aligned correctly.

MFC r257702, r257745, r257746, r257747, r257751, r257791, r257793,
r257794, r257795, r257992

Teach nexus(4) about Open Firmware (e.g. FDT) on ARM and MIPS, retiring
fdtbus in most cases.

Make OF_nextprop() work correctly for FDT by using the libfdt
fdt_next_property_offset() API.

Do not panic if pmap_mincore() is called.

An addendum: it is possible, though of questionable utility, for a node
to have no properties at all.
Add definition for the Atheros 8021 gigabit PHY.

Consolidate Apple firmware hacks and improve them by switching on the
presence of mac-io devices in the tree, which uniquely identifies Apple
hardware.

Allow OF_decode_addr() to also be able to map resources on big-endian
devices.

Make tsec work with the device tree present on the RB800.

Be more flexible about which compatible strings to accept. This brings up
the PCI Express bus on the RB800 using the firmware device tree.

Rename the "bare" platform "mpc85xx", which is what it actually is, and
add actual platform probing based on PVR.

MFC r257180, r257195, r257196, r257198, r257209, r257295

Add some extra sanity checking and checks to printf format specifiers.

Try even harder to find a console before giving up.

Make devices with registers into the KVA region work reliably.

Turn on VM_KMEM_SIZE_SCALE on 32-bit as well as 64-bit PowerPC.

Return NOKEY instead of 0 if there are no more key presses queued.

MFC r257161, r257169, r257178, r257190, r257191

Add pmap_mapdev_attr() and pmap_kenter_attr() interfaces.

Fix concurrency issues with TLB1 updates and make pmap_kextract() search
TLB1 mappings as well

Interrelated improvements to early boot mappings:
- Remove explicit requirement that the SOC registers be found except as an
optimization (although the MPC85XX LAW drivers still require they be found
externally, which should change).
- Remove magic CCSRBAR_VA value.
- Allow bus_machdep.c's early-boot code to handle non 1:1 mappings and
systems not in real-mode or global 1:1 maps in early boot.
- Allow pmap_mapdev() on Book-E to reissue previous addresses if the
area is already mapped. Additionally have it check all mappings, not
just the CCSR area.

Add some extra sanity checking and checks to printf format specifiers.

Bump initial TLB size. The kernel is not necessarily less than 16 MB

Handle (in a slightly ugly way) ePAPR-type loaders that just place a
device tree into r3.

MFC r256814, r256816, r256818, r256846, r256855, r256864 (by nwhitehorn):

- Handle 2GB of ram
- Allow the OFW interrupt mapping code to work with PCI devices not
enumerated by Open Firmware, as in the case of FDT.
- Provide an interface for PCI bus drivers that need some of ofw_pci's
metadata during attach.
- Use standard ofw_bus helpers instead of reinventing the wheel.
- Make hard-wired TLB allocations be at minimum one page.

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

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 r258002, r258024, r258027, r258051, r258052, r258243, r258244, r258002,
r258024, r258027, r258051, r258052, r258243,

Follow up r223485, which made AIM use the ABI thread pointer instead of
PCPU fields for curthread, by doing the same to Book-E.

Use the same implementation of copyinout.c for both AIM and Book-E.

Actually add IOMMU domain to the list of known mappings.

Following the approach with ACPI DMAR on x86, split IOMMU handling into
a variant PCI bus instead of trying to shoehorn it into the PCI host bridge
adapter.

Make sure that TLB1 mappings are aligned correctly.

MFC r257702, r257745, r257746, r257747, r257751, r257791, r257793,
r257794, r257795, r257992

Teach nexus(4) about Open Firmware (e.g. FDT) on ARM and MIPS, retiring
fdtbus in most cases.

Make OF_nextprop() work correctly for FDT by using the libfdt
fdt_next_property_offset() API.

Do not panic if pmap_mincore() is called.

An addendum: it is possible, though of questionable utility, for a node
to have no properties at all.
Add definition for the Atheros 8021 gigabit PHY.

Consolidate Apple firmware hacks and improve them by switching on the
presence of mac-io devices in the tree, which uniquely identifies Apple
hardware.

Allow OF_decode_addr() to also be able to map resources on big-endian
devices.

Make tsec work with the device tree present on the RB800.

Be more flexible about which compatible strings to accept. This brings up
the PCI Express bus on the RB800 using the firmware device tree.

Rename the "bare" platform "mpc85xx", which is what it actually is, and
add actual platform probing based on PVR.

MFC r257180, r257195, r257196, r257198, r257209, r257295

Add some extra sanity checking and checks to printf format specifiers.

Try even harder to find a console before giving up.

Make devices with registers into the KVA region work reliably.

Turn on VM_KMEM_SIZE_SCALE on 32-bit as well as 64-bit PowerPC.

Return NOKEY instead of 0 if there are no more key presses queued.

MFC r257161, r257169, r257178, r257190, r257191

Add pmap_mapdev_attr() and pmap_kenter_attr() interfaces.

Fix concurrency issues with TLB1 updates and make pmap_kextract() search
TLB1 mappings as well

Interrelated improvements to early boot mappings:
- Remove explicit requirement that the SOC registers be found except as an
optimization (although the MPC85XX LAW drivers still require they be found
externally, which should change).
- Remove magic CCSRBAR_VA value.
- Allow bus_machdep.c's early-boot code to handle non 1:1 mappings and
systems not in real-mode or global 1:1 maps in early boot.
- Allow pmap_mapdev() on Book-E to reissue previous addresses if the
area is already mapped. Additionally have it check all mappings, not
just the CCSR area.

Add some extra sanity checking and checks to printf format specifiers.

Bump initial TLB size. The kernel is not necessarily less than 16 MB

Handle (in a slightly ugly way) ePAPR-type loaders that just place a
device tree into r3.

MFC r256814, r256816, r256818, r256846, r256855, r256864 (by nwhitehorn):

- Handle 2GB of ram
- Allow the OFW interrupt mapping code to work with PCI devices not
enumerated by Open Firmware, as in the case of FDT.
- Provide an interface for PCI bus drivers that need some of ofw_pci's
metadata during attach.
- Use standard ofw_bus helpers instead of reinventing the wheel.
- Make hard-wired TLB allocations be at minimum one page.