pmap_remove_all(): Return a boolean value to indicate the behaviour. If
true, all mappings have been removed, the pmap is totally cleared out, and
UVM can then avoid doing the work to call pmap_remove() for each map entry.
If false, either nothing has been done, or some helpful arch-specific voodoo
has taken place.

Fix pmap_prefer for topdown and turn topdown on.

branches: 1.35.18; 1.35.36;
Move struct vm_page_md definition from vmparam.h to pmap.h, because
it's used only by pmap. vmparam.h has definitions for wider
audience.

All GENERIC kernels build tested, except ia64.

powerpc/include/booke/vmparam.h has one too, but it has no pmap.h,
so it's left as is.

branches: 1.34.2; 1.34.4;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Make pmap_kernel() a MI macro for struct pmap *kernel_pmap_ptr,
which is now the "API" provided by the pmap module. pmap_kernel()
remains as the syntactic sugar.

Bonus cosmetics round: move all the pmap_t pointer typedefs into
uvm_pmap.h.

Thanks to Greg Oster for providing cpu muscle for doing test builds.

branches: 1.32.6; 1.32.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.31.34; 1.31.36; 1.31.38;
There are only 32 bits in a VA, not 33 - sync comment with this harsh reality.

branches: 1.30.4; 1.30.6; 1.30.8;
Replace the Mach-derived boolean_t type with the C99 bool type. A
future commit will replace use of TRUE and FALSE with true and false.

branches: 1.29.4;
Allow shared PV mappings in pmap_enter(9) even on SH4 if VAs of shared pages
have the same virtual cache indexes (i.e. they won't cause virtual cache
aliases). Also prepare PMAP_PREFER(9) for SH4 to avoid some possible virtual
cache aliases.
More stuff should be added in pmap_enter(9), but at least this changes
should fix some existing problems. See discussion on port-sh3 ML for details.

OK'ed by uwe and chs, and closes PR port-sh3/34243.

branches: 1.28.8; 1.28.10;
Decorate pmap_remove_all() with /* ARGSUSED */

branches: 1.27.2; 1.27.4; 1.27.6;
Change "inline" back to "__inline" in .h files -- C99 is still too
new, and some apps compile things in C89 mode. C89 keywords stay.

As per core@.

branches: 1.26.2; 1.26.4; 1.26.6;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

branches: 1.25.22;
it really helps to get the stub right before cutting + pasting it 27 times.
alas, I did not. doh.

add pmap_remove_all() hook (empty on most platforms so far).

branches: 1.23.6;
new pmap designed for SH3/SH4.

Use "#define<tab>", white space nits.

remove obsolete functions, decralations and structure.

sync with i386/include/pmap.h rev. 1.45:

make dangerous pmap_copy() and pmap_move() no-op.

SR related parts moved to psl.h. cpufunc.h segments.h are removed.
kernel mode checking is only SR.MD. no check stack pointer.

Remove #if 0 #endif

Add new MMU API. for detail, see sh3/mmu.h's comment.

ANSIfy KNF.

clean up redundant PTE PG_* defines.
PG_RO -> PG_KR
PG_RW -> PG_KW
PG_u -> PG_URKR
PG_PROT -> PG_UW
PG_AVAIL1 -> PG_PVLIST

Update pmap_update to now take the updated pmap as an argument.
This will allow improvements to the pmaps so that they can more easily defer expensive operations, eg tlb/cache flush, til the last possible moment.

Currently this is a no-op on most platforms, so they should see no difference.

Reviewed by Jason.

branches: 1.13.2; 1.13.4;
replace {simple_,}lock{_data,}_t with struct {simple,}lock {,*}.

Undo a misguided previous change to the pmap_update() API.

make this compile again under SH4

Give pmap_update() an argument (a pmap_t) so that it knows which
pmap it should be updating.

pmap_update() should not be equated with "flush entire TLB", it is
used to process deferred pmap operations. Since these pmaps don't
defer anything, pmap_update() is a noop.

branches: 1.8.2;
temporary fix a serious pmap problem with dummy PMAP_{MAP,UNMAP}_POOLPAGE().

To fix correctly, set IOM_RAM_BEGIN with P0 addr instead of P1 addr and
fix machdep.c and pmap.c.

Rewrite how mod/ref emulation is done. In particular, make
modified attribute checking actually work. Previously, a
page could be reported as modified even if it wasn't! This
is very bad, and e.g. caused the VM system to attempt to
"clean" pages of read-only files.

Only lip-services is paid to referenced attribute emulation.
This could be improved.

We do wired page accounting. Tell UVM about this.

branches: 1.5.4;
Use P1SEG to map pool pages.

SH4!

remove SH3_PHYS_TO_P1SEG macro

branches: 1.2.2;
Catch up with -current.

Merge in NetBSD/sh3 from cvs.kame.net repository.

Tree structure:
- sys/arch/sh3: sh3 generic code
As commented, in-chip device drivers are put into sys/arch/sh3/dev.
- sys/arch/evbsh3: sh3 evaluation boards (pure sh3 CPU, no fancy external HW)
- sys/arch/mmeye: Brains mmEye, www.brains.co.jp
MI source code includes couple of #ifdef for sh3-coff support.
(sh3 uses coff or elf)

Needs some more improvements, especialy in sys/arch/sh3/conf/files.sh3,
to compile the tree (due to last minute tree structure change).

Fix pmap_prefer for topdown and turn topdown on.

branches: 1.35.36;
Move struct vm_page_md definition from vmparam.h to pmap.h, because
it's used only by pmap. vmparam.h has definitions for wider
audience.

All GENERIC kernels build tested, except ia64.

powerpc/include/booke/vmparam.h has one too, but it has no pmap.h,
so it's left as is.

branches: 1.34.2; 1.34.4;
Remove uarea swap-out functionality:

- Addresses the issue described in PR/38828.
- Some simplification in threading and sleepq subsystems.
- Eliminates pmap_collect() and, as a side note, allows pmap optimisations.
- Eliminates XS_CTL_DATA_ONSTACK in scsipi code.
- Avoids few scans on LWP list and thus potentially long holds of proc_lock.
- Cuts ~1.5k lines of code. Reduces amd64 kernel size by ~4k.
- Removes __SWAP_BROKEN cases.

Tested on x86, mips, acorn32 (thanks <mpumford>) and partly tested on
acorn26 (thanks to <bjh21>).

Discussed on <tech-kern>, reviewed by <ad>.

Make pmap_kernel() a MI macro for struct pmap *kernel_pmap_ptr,
which is now the "API" provided by the pmap module. pmap_kernel()
remains as the syntactic sugar.

Bonus cosmetics round: move all the pmap_t pointer typedefs into
uvm_pmap.h.

Thanks to Greg Oster for providing cpu muscle for doing test builds.

branches: 1.32.6; 1.32.8;
Remove clause 3 and 4 from TNF licenses

branches: 1.31.34; 1.31.36; 1.31.38;
There are only 32 bits in a VA, not 33 - sync comment with this harsh reality.

branches: 1.30.4; 1.30.6; 1.30.8;
Replace the Mach-derived boolean_t type with the C99 bool type. A
future commit will replace use of TRUE and FALSE with true and false.

branches: 1.29.4;
Allow shared PV mappings in pmap_enter(9) even on SH4 if VAs of shared pages
have the same virtual cache indexes (i.e. they won't cause virtual cache
aliases). Also prepare PMAP_PREFER(9) for SH4 to avoid some possible virtual
cache aliases.
More stuff should be added in pmap_enter(9), but at least this changes
should fix some existing problems. See discussion on port-sh3 ML for details.

OK'ed by uwe and chs, and closes PR port-sh3/34243.

branches: 1.28.8; 1.28.10;
Decorate pmap_remove_all() with /* ARGSUSED */

branches: 1.27.2; 1.27.4; 1.27.6;
Change "inline" back to "__inline" in .h files -- C99 is still too
new, and some apps compile things in C89 mode. C89 keywords stay.

As per core@.

branches: 1.26.2; 1.26.4; 1.26.6;
Remove leading __ from __(const|inline|signed|volatile) -- it is obsolete.

branches: 1.25.22;
it really helps to get the stub right before cutting + pasting it 27 times.
alas, I did not. doh.

add pmap_remove_all() hook (empty on most platforms so far).

branches: 1.23.6;
new pmap designed for SH3/SH4.

Use "#define<tab>", white space nits.

remove obsolete functions, decralations and structure.

sync with i386/include/pmap.h rev. 1.45:

make dangerous pmap_copy() and pmap_move() no-op.

SR related parts moved to psl.h. cpufunc.h segments.h are removed.
kernel mode checking is only SR.MD. no check stack pointer.

Remove #if 0 #endif

Add new MMU API. for detail, see sh3/mmu.h's comment.

ANSIfy KNF.

clean up redundant PTE PG_* defines.
PG_RO -> PG_KR
PG_RW -> PG_KW
PG_u -> PG_URKR
PG_PROT -> PG_UW
PG_AVAIL1 -> PG_PVLIST

Update pmap_update to now take the updated pmap as an argument.
This will allow improvements to the pmaps so that they can more easily defer expensive operations, eg tlb/cache flush, til the last possible moment.

Currently this is a no-op on most platforms, so they should see no difference.

Reviewed by Jason.

branches: 1.13.2; 1.13.4;
replace {simple_,}lock{_data,}_t with struct {simple,}lock {,*}.

Undo a misguided previous change to the pmap_update() API.

make this compile again under SH4

Give pmap_update() an argument (a pmap_t) so that it knows which
pmap it should be updating.

pmap_update() should not be equated with "flush entire TLB", it is
used to process deferred pmap operations. Since these pmaps don't
defer anything, pmap_update() is a noop.

branches: 1.8.2;
temporary fix a serious pmap problem with dummy PMAP_{MAP,UNMAP}_POOLPAGE().

To fix correctly, set IOM_RAM_BEGIN with P0 addr instead of P1 addr and
fix machdep.c and pmap.c.

Rewrite how mod/ref emulation is done. In particular, make
modified attribute checking actually work. Previously, a
page could be reported as modified even if it wasn't! This
is very bad, and e.g. caused the VM system to attempt to
"clean" pages of read-only files.

Only lip-services is paid to referenced attribute emulation.
This could be improved.

We do wired page accounting. Tell UVM about this.

branches: 1.5.4;
Use P1SEG to map pool pages.

SH4!

remove SH3_PHYS_TO_P1SEG macro

branches: 1.2.2;
Catch up with -current.

Merge in NetBSD/sh3 from cvs.kame.net repository.

Tree structure:
- sys/arch/sh3: sh3 generic code
As commented, in-chip device drivers are put into sys/arch/sh3/dev.
- sys/arch/evbsh3: sh3 evaluation boards (pure sh3 CPU, no fancy external HW)
- sys/arch/mmeye: Brains mmEye, www.brains.co.jp
MI source code includes couple of #ifdef for sh3-coff support.
(sh3 uses coff or elf)

Needs some more improvements, especialy in sys/arch/sh3/conf/files.sh3,
to compile the tree (due to last minute tree structure change).