Add mimmutable(2) system call which locks the permissions (PROT_*) of
memory mappings so they cannot be changed by a later mmap(), mprotect(),
or munmap(), which will error with EPERM instead.
ok kettenis

New mmap(2) flag: MAP_CONCEAL.

MAP_CONCEAL'd memory is not written to disk in the event of a core dump.
It may grow other qualities in the future.

Wanted by libressl, probably useful elsewhere, too.

Prompted by deraadt@, concept from deraadt@/kettenis@. With input from
deraadt@, cjeker@, kettenis@, otto@, bcook@, matthew@, guenther@, djm@,
and tedu@.

ok otto@ deraadt@

mincore() is a relic from the past, exposing physical machine information
about shared resources which no program should see. only a few pieces of
software use it, generally poorly thought out. they are being fixed, so
mincore() can be deleted.
ok guenther tedu jca sthen, others

oops, typo

light documentation for MAP_STACK

Add MAP_STACK flag. Currently masked by mmap()

Delete the kernel compat bits for old mmap() MAP_OLD* flags

ok deraadt@ matthew@ jca@

Prefer MADV_* over POSIX_MADV_* in kernel for consistency: the latter
doesn't have all the values and therefore can't be used everywhere.

ok deraadt@ kettenis@

Introduce __MAP_NOFAULT, a mmap(2) flag that makes sure a mapping will not
cause a SIGSEGV or SIGBUS when a mapped file gets truncated. Access to
pages that are not backed by a file on such a mapping will be replaced by
zero-filled anonymous pages. Makes passing file descriptors of mapped files
usable without having to play tricks with signal handlers.

"steal your mmap flag" deraadt@

Add MAP_ANONYMOUS as a synonym for MAP_ANON, per POSIX proposal

ok miod

Cleanup support for legacy mmap flags

Move all legacy MAP_FOO values behind #ifndef _KERNEL and redefine
them to either be aliases for existing flags (e.g., MAP_COPY ->
MAP_PRIVATE) or 0.

Also, add MAP_OLDFOO defines (behind #ifndef _KERNEL) so the kernel
and kdump can remain compatible with current OpenBSD binaries.

ok deraadt

Add support for MAP_INHERIT_ZERO.

This provides a way for a process to designate pages in its address
space that should be replaced by fresh, zero-initialized anonymous
memory in forked child processes, rather than being copied or shared.

ok jmc, kettenis, tedu, deraadt; positive feedback from many more

add shm_open and friends which i have been told ports programs would
like to use.
ok deraadt guenther

Add a new mmap(2) flag __MAP_NOREMAP for use with MAP_FIXED to
indicate that the kernel should fail with MAP_FAILED if the specified
address is not currently available instead of unmapping it.

Change ld.so on i386 to make use of __MAP_NOREMAP to improve
reliability.

__MAP_NOREMAP diff by guenther based on an earlier diff by Ariane;
ld.so bits by guenther and me
bulk build stress testing of earlier diffs by sthen
ok deraadt; committing now for further testing

Remove an obsolete (was in rev 1.1) and unclear comment

defintion -> definition.

add posix_madvise, posix_memalign, strndup, and strnlen. mostly from
brad and millert, with hints from guenther, jmc, and otto I think.
ok previous.

enforce restrictions on prot and flags to mprotect and mmap. invalid or
undefined flags are now rejected instead of silently ignored. makes
"unintentional" mprotect calls a touch harder.
ok art@ deraadt@ jason@

add MAP_TRYFIXED, mostly to help emulate other systems.
when set, uvm will not attempt to avoid a heap address, if requested.
from todd vierling, via
http://marc.theaimsgroup.com/?l=netbsd-tech-kern&m=105612525808607&w=1

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built, booted, and 'make includes' before building
ld.so with this change.

backout mquery change, something broke when not combined with a different diff.

change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built and installed before building ld.so with this change.
ok millert@ tedu@

There are two related changes.

The first one is an mquery(2) syscall. It's for asking the VM system
about where to map things. It will be used by ld.so, read the man page
for details.

The second change is related and is a centralization of uvm_map hint
that all callers of uvm_map calculated. This will allow us to adjust
this hint on architectures that have segments for non-exec mappings.

deraadt@ drahn@ ok.

First round of __P removal in sys

branches: 1.10.2;
More sync to NetBSD.
- Use malloc/free instead of MALLOC/FREE for variable sized allocations.
- Move the memory inheritance code to sys/mman.h and rename from VM_* to MAP_*
- various cleanups and simplifications.

More sync to NetBSD.
The highlight is some more advices to madvise(2).
o MADV_DONTNEED will deactive the pages in the given range giving a quicker
reuse.
o MADV_FREE will garbage-collect the pages and swap resources causing the
next fault to either page in new pages from backing store (mapped vnode)
or allocate new zero-fill pages (anonymous mapping).

More syncing to NetBSD.

Implements mincore(2), mlockall(2) and munlockall(2). mlockall and munlockall
are disabled for the moment.

The rest is mostly cosmetic.

branches: 1.7.8;
const mlock(2) and munlock(2)

make mmap() return void *, add MAP_FAILED

convert to void *addr

make msync() have 3 args

Add prototype for mincore(2)

From NetBSD: 960217 merge

branches: 1.1.1;
Initial revision

New mmap(2) flag: MAP_CONCEAL.

MAP_CONCEAL'd memory is not written to disk in the event of a core dump.
It may grow other qualities in the future.

Wanted by libressl, probably useful elsewhere, too.

Prompted by deraadt@, concept from deraadt@/kettenis@. With input from
deraadt@, cjeker@, kettenis@, otto@, bcook@, matthew@, guenther@, djm@,
and tedu@.

ok otto@ deraadt@

mincore() is a relic from the past, exposing physical machine information
about shared resources which no program should see. only a few pieces of
software use it, generally poorly thought out. they are being fixed, so
mincore() can be deleted.
ok guenther tedu jca sthen, others

oops, typo

light documentation for MAP_STACK

Add MAP_STACK flag. Currently masked by mmap()

Delete the kernel compat bits for old mmap() MAP_OLD* flags

ok deraadt@ matthew@ jca@

Prefer MADV_* over POSIX_MADV_* in kernel for consistency: the latter
doesn't have all the values and therefore can't be used everywhere.

ok deraadt@ kettenis@

Introduce __MAP_NOFAULT, a mmap(2) flag that makes sure a mapping will not
cause a SIGSEGV or SIGBUS when a mapped file gets truncated. Access to
pages that are not backed by a file on such a mapping will be replaced by
zero-filled anonymous pages. Makes passing file descriptors of mapped files
usable without having to play tricks with signal handlers.

"steal your mmap flag" deraadt@

Add MAP_ANONYMOUS as a synonym for MAP_ANON, per POSIX proposal

ok miod

Cleanup support for legacy mmap flags

Move all legacy MAP_FOO values behind #ifndef _KERNEL and redefine
them to either be aliases for existing flags (e.g., MAP_COPY ->
MAP_PRIVATE) or 0.

Also, add MAP_OLDFOO defines (behind #ifndef _KERNEL) so the kernel
and kdump can remain compatible with current OpenBSD binaries.

ok deraadt

Add support for MAP_INHERIT_ZERO.

This provides a way for a process to designate pages in its address
space that should be replaced by fresh, zero-initialized anonymous
memory in forked child processes, rather than being copied or shared.

ok jmc, kettenis, tedu, deraadt; positive feedback from many more

add shm_open and friends which i have been told ports programs would
like to use.
ok deraadt guenther

Add a new mmap(2) flag __MAP_NOREMAP for use with MAP_FIXED to
indicate that the kernel should fail with MAP_FAILED if the specified
address is not currently available instead of unmapping it.

Change ld.so on i386 to make use of __MAP_NOREMAP to improve
reliability.

__MAP_NOREMAP diff by guenther based on an earlier diff by Ariane;
ld.so bits by guenther and me
bulk build stress testing of earlier diffs by sthen
ok deraadt; committing now for further testing

Remove an obsolete (was in rev 1.1) and unclear comment

defintion -> definition.

add posix_madvise, posix_memalign, strndup, and strnlen. mostly from
brad and millert, with hints from guenther, jmc, and otto I think.
ok previous.

enforce restrictions on prot and flags to mprotect and mmap. invalid or
undefined flags are now rejected instead of silently ignored. makes
"unintentional" mprotect calls a touch harder.
ok art@ deraadt@ jason@

add MAP_TRYFIXED, mostly to help emulate other systems.
when set, uvm will not attempt to avoid a heap address, if requested.
from todd vierling, via
http://marc.theaimsgroup.com/?l=netbsd-tech-kern&m=105612525808607&w=1

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built, booted, and 'make includes' before building
ld.so with this change.

backout mquery change, something broke when not combined with a different diff.

change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built and installed before building ld.so with this change.
ok millert@ tedu@

There are two related changes.

The first one is an mquery(2) syscall. It's for asking the VM system
about where to map things. It will be used by ld.so, read the man page
for details.

The second change is related and is a centralization of uvm_map hint
that all callers of uvm_map calculated. This will allow us to adjust
this hint on architectures that have segments for non-exec mappings.

deraadt@ drahn@ ok.

First round of __P removal in sys

branches: 1.10.2;
More sync to NetBSD.
- Use malloc/free instead of MALLOC/FREE for variable sized allocations.
- Move the memory inheritance code to sys/mman.h and rename from VM_* to MAP_*
- various cleanups and simplifications.

More sync to NetBSD.
The highlight is some more advices to madvise(2).
o MADV_DONTNEED will deactive the pages in the given range giving a quicker
reuse.
o MADV_FREE will garbage-collect the pages and swap resources causing the
next fault to either page in new pages from backing store (mapped vnode)
or allocate new zero-fill pages (anonymous mapping).

More syncing to NetBSD.

Implements mincore(2), mlockall(2) and munlockall(2). mlockall and munlockall
are disabled for the moment.

The rest is mostly cosmetic.

branches: 1.7.8;
const mlock(2) and munlock(2)

make mmap() return void *, add MAP_FAILED

convert to void *addr

make msync() have 3 args

Add prototype for mincore(2)

From NetBSD: 960217 merge

branches: 1.1.1;
Initial revision

mincore() is a relic from the past, exposing physical machine information
about shared resources which no program should see. only a few pieces of
software use it, generally poorly thought out. they are being fixed, so
mincore() can be deleted.
ok guenther tedu jca sthen, others

oops, typo

light documentation for MAP_STACK

Add MAP_STACK flag. Currently masked by mmap()

Delete the kernel compat bits for old mmap() MAP_OLD* flags

ok deraadt@ matthew@ jca@

Prefer MADV_* over POSIX_MADV_* in kernel for consistency: the latter
doesn't have all the values and therefore can't be used everywhere.

ok deraadt@ kettenis@

Introduce __MAP_NOFAULT, a mmap(2) flag that makes sure a mapping will not
cause a SIGSEGV or SIGBUS when a mapped file gets truncated. Access to
pages that are not backed by a file on such a mapping will be replaced by
zero-filled anonymous pages. Makes passing file descriptors of mapped files
usable without having to play tricks with signal handlers.

"steal your mmap flag" deraadt@

Add MAP_ANONYMOUS as a synonym for MAP_ANON, per POSIX proposal

ok miod

Cleanup support for legacy mmap flags

Move all legacy MAP_FOO values behind #ifndef _KERNEL and redefine
them to either be aliases for existing flags (e.g., MAP_COPY ->
MAP_PRIVATE) or 0.

Also, add MAP_OLDFOO defines (behind #ifndef _KERNEL) so the kernel
and kdump can remain compatible with current OpenBSD binaries.

ok deraadt

Add support for MAP_INHERIT_ZERO.

This provides a way for a process to designate pages in its address
space that should be replaced by fresh, zero-initialized anonymous
memory in forked child processes, rather than being copied or shared.

ok jmc, kettenis, tedu, deraadt; positive feedback from many more

add shm_open and friends which i have been told ports programs would
like to use.
ok deraadt guenther

Add a new mmap(2) flag __MAP_NOREMAP for use with MAP_FIXED to
indicate that the kernel should fail with MAP_FAILED if the specified
address is not currently available instead of unmapping it.

Change ld.so on i386 to make use of __MAP_NOREMAP to improve
reliability.

__MAP_NOREMAP diff by guenther based on an earlier diff by Ariane;
ld.so bits by guenther and me
bulk build stress testing of earlier diffs by sthen
ok deraadt; committing now for further testing

Remove an obsolete (was in rev 1.1) and unclear comment

defintion -> definition.

add posix_madvise, posix_memalign, strndup, and strnlen. mostly from
brad and millert, with hints from guenther, jmc, and otto I think.
ok previous.

enforce restrictions on prot and flags to mprotect and mmap. invalid or
undefined flags are now rejected instead of silently ignored. makes
"unintentional" mprotect calls a touch harder.
ok art@ deraadt@ jason@

add MAP_TRYFIXED, mostly to help emulate other systems.
when set, uvm will not attempt to avoid a heap address, if requested.
from todd vierling, via
http://marc.theaimsgroup.com/?l=netbsd-tech-kern&m=105612525808607&w=1

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built, booted, and 'make includes' before building
ld.so with this change.

backout mquery change, something broke when not combined with a different diff.

change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built and installed before building ld.so with this change.
ok millert@ tedu@

There are two related changes.

The first one is an mquery(2) syscall. It's for asking the VM system
about where to map things. It will be used by ld.so, read the man page
for details.

The second change is related and is a centralization of uvm_map hint
that all callers of uvm_map calculated. This will allow us to adjust
this hint on architectures that have segments for non-exec mappings.

deraadt@ drahn@ ok.

First round of __P removal in sys

branches: 1.10.2;
More sync to NetBSD.
- Use malloc/free instead of MALLOC/FREE for variable sized allocations.
- Move the memory inheritance code to sys/mman.h and rename from VM_* to MAP_*
- various cleanups and simplifications.

More sync to NetBSD.
The highlight is some more advices to madvise(2).
o MADV_DONTNEED will deactive the pages in the given range giving a quicker
reuse.
o MADV_FREE will garbage-collect the pages and swap resources causing the
next fault to either page in new pages from backing store (mapped vnode)
or allocate new zero-fill pages (anonymous mapping).

More syncing to NetBSD.

Implements mincore(2), mlockall(2) and munlockall(2). mlockall and munlockall
are disabled for the moment.

The rest is mostly cosmetic.

branches: 1.7.8;
const mlock(2) and munlock(2)

make mmap() return void *, add MAP_FAILED

convert to void *addr

make msync() have 3 args

Add prototype for mincore(2)

From NetBSD: 960217 merge

branches: 1.1.1;
Initial revision

oops, typo

light documentation for MAP_STACK

Add MAP_STACK flag. Currently masked by mmap()

Delete the kernel compat bits for old mmap() MAP_OLD* flags

ok deraadt@ matthew@ jca@

Prefer MADV_* over POSIX_MADV_* in kernel for consistency: the latter
doesn't have all the values and therefore can't be used everywhere.

ok deraadt@ kettenis@

Introduce __MAP_NOFAULT, a mmap(2) flag that makes sure a mapping will not
cause a SIGSEGV or SIGBUS when a mapped file gets truncated. Access to
pages that are not backed by a file on such a mapping will be replaced by
zero-filled anonymous pages. Makes passing file descriptors of mapped files
usable without having to play tricks with signal handlers.

"steal your mmap flag" deraadt@

Add MAP_ANONYMOUS as a synonym for MAP_ANON, per POSIX proposal

ok miod

Cleanup support for legacy mmap flags

Move all legacy MAP_FOO values behind #ifndef _KERNEL and redefine
them to either be aliases for existing flags (e.g., MAP_COPY ->
MAP_PRIVATE) or 0.

Also, add MAP_OLDFOO defines (behind #ifndef _KERNEL) so the kernel
and kdump can remain compatible with current OpenBSD binaries.

ok deraadt

Add support for MAP_INHERIT_ZERO.

This provides a way for a process to designate pages in its address
space that should be replaced by fresh, zero-initialized anonymous
memory in forked child processes, rather than being copied or shared.

ok jmc, kettenis, tedu, deraadt; positive feedback from many more

add shm_open and friends which i have been told ports programs would
like to use.
ok deraadt guenther

Add a new mmap(2) flag __MAP_NOREMAP for use with MAP_FIXED to
indicate that the kernel should fail with MAP_FAILED if the specified
address is not currently available instead of unmapping it.

Change ld.so on i386 to make use of __MAP_NOREMAP to improve
reliability.

__MAP_NOREMAP diff by guenther based on an earlier diff by Ariane;
ld.so bits by guenther and me
bulk build stress testing of earlier diffs by sthen
ok deraadt; committing now for further testing

Remove an obsolete (was in rev 1.1) and unclear comment

defintion -> definition.

add posix_madvise, posix_memalign, strndup, and strnlen. mostly from
brad and millert, with hints from guenther, jmc, and otto I think.
ok previous.

enforce restrictions on prot and flags to mprotect and mmap. invalid or
undefined flags are now rejected instead of silently ignored. makes
"unintentional" mprotect calls a touch harder.
ok art@ deraadt@ jason@

add MAP_TRYFIXED, mostly to help emulate other systems.
when set, uvm will not attempt to avoid a heap address, if requested.
from todd vierling, via
http://marc.theaimsgroup.com/?l=netbsd-tech-kern&m=105612525808607&w=1

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built, booted, and 'make includes' before building
ld.so with this change.

backout mquery change, something broke when not combined with a different diff.

change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built and installed before building ld.so with this change.
ok millert@ tedu@

There are two related changes.

The first one is an mquery(2) syscall. It's for asking the VM system
about where to map things. It will be used by ld.so, read the man page
for details.

The second change is related and is a centralization of uvm_map hint
that all callers of uvm_map calculated. This will allow us to adjust
this hint on architectures that have segments for non-exec mappings.

deraadt@ drahn@ ok.

First round of __P removal in sys

branches: 1.10.2;
More sync to NetBSD.
- Use malloc/free instead of MALLOC/FREE for variable sized allocations.
- Move the memory inheritance code to sys/mman.h and rename from VM_* to MAP_*
- various cleanups and simplifications.

More sync to NetBSD.
The highlight is some more advices to madvise(2).
o MADV_DONTNEED will deactive the pages in the given range giving a quicker
reuse.
o MADV_FREE will garbage-collect the pages and swap resources causing the
next fault to either page in new pages from backing store (mapped vnode)
or allocate new zero-fill pages (anonymous mapping).

More syncing to NetBSD.

Implements mincore(2), mlockall(2) and munlockall(2). mlockall and munlockall
are disabled for the moment.

The rest is mostly cosmetic.

branches: 1.7.8;
const mlock(2) and munlock(2)

make mmap() return void *, add MAP_FAILED

convert to void *addr

make msync() have 3 args

Add prototype for mincore(2)

From NetBSD: 960217 merge

branches: 1.1.1;
Initial revision

Delete the kernel compat bits for old mmap() MAP_OLD* flags

ok deraadt@ matthew@ jca@

Prefer MADV_* over POSIX_MADV_* in kernel for consistency: the latter
doesn't have all the values and therefore can't be used everywhere.

ok deraadt@ kettenis@

Introduce __MAP_NOFAULT, a mmap(2) flag that makes sure a mapping will not
cause a SIGSEGV or SIGBUS when a mapped file gets truncated. Access to
pages that are not backed by a file on such a mapping will be replaced by
zero-filled anonymous pages. Makes passing file descriptors of mapped files
usable without having to play tricks with signal handlers.

"steal your mmap flag" deraadt@

Add MAP_ANONYMOUS as a synonym for MAP_ANON, per POSIX proposal

ok miod

Cleanup support for legacy mmap flags

Move all legacy MAP_FOO values behind #ifndef _KERNEL and redefine
them to either be aliases for existing flags (e.g., MAP_COPY ->
MAP_PRIVATE) or 0.

Also, add MAP_OLDFOO defines (behind #ifndef _KERNEL) so the kernel
and kdump can remain compatible with current OpenBSD binaries.

ok deraadt

Add support for MAP_INHERIT_ZERO.

This provides a way for a process to designate pages in its address
space that should be replaced by fresh, zero-initialized anonymous
memory in forked child processes, rather than being copied or shared.

ok jmc, kettenis, tedu, deraadt; positive feedback from many more

add shm_open and friends which i have been told ports programs would
like to use.
ok deraadt guenther

Add a new mmap(2) flag __MAP_NOREMAP for use with MAP_FIXED to
indicate that the kernel should fail with MAP_FAILED if the specified
address is not currently available instead of unmapping it.

Change ld.so on i386 to make use of __MAP_NOREMAP to improve
reliability.

__MAP_NOREMAP diff by guenther based on an earlier diff by Ariane;
ld.so bits by guenther and me
bulk build stress testing of earlier diffs by sthen
ok deraadt; committing now for further testing

Remove an obsolete (was in rev 1.1) and unclear comment

defintion -> definition.

add posix_madvise, posix_memalign, strndup, and strnlen. mostly from
brad and millert, with hints from guenther, jmc, and otto I think.
ok previous.

enforce restrictions on prot and flags to mprotect and mmap. invalid or
undefined flags are now rejected instead of silently ignored. makes
"unintentional" mprotect calls a touch harder.
ok art@ deraadt@ jason@

add MAP_TRYFIXED, mostly to help emulate other systems.
when set, uvm will not attempt to avoid a heap address, if requested.
from todd vierling, via
http://marc.theaimsgroup.com/?l=netbsd-tech-kern&m=105612525808607&w=1

Remove the advertising clause in the UCB license which Berkeley
rescinded 22 July 1999. Proofed by myself and Theo.

Change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built, booted, and 'make includes' before building
ld.so with this change.

backout mquery change, something broke when not combined with a different diff.

change mquery() function call signature to be the same a mmap(). It
needs the prot/flags info and passing the addresses via arg/return allows
it to be traced via ktrace better than an in/out paramter.
This adds a new mquery syscall and renames the old one to omquery.
New kernel _MUST_ be built and installed before building ld.so with this change.
ok millert@ tedu@

There are two related changes.

The first one is an mquery(2) syscall. It's for asking the VM system
about where to map things. It will be used by ld.so, read the man page
for details.

The second change is related and is a centralization of uvm_map hint
that all callers of uvm_map calculated. This will allow us to adjust
this hint on architectures that have segments for non-exec mappings.

deraadt@ drahn@ ok.

First round of __P removal in sys

branches: 1.10.2;
More sync to NetBSD.
- Use malloc/free instead of MALLOC/FREE for variable sized allocations.
- Move the memory inheritance code to sys/mman.h and rename from VM_* to MAP_*
- various cleanups and simplifications.

More sync to NetBSD.
The highlight is some more advices to madvise(2).
o MADV_DONTNEED will deactive the pages in the given range giving a quicker
reuse.
o MADV_FREE will garbage-collect the pages and swap resources causing the
next fault to either page in new pages from backing store (mapped vnode)
or allocate new zero-fill pages (anonymous mapping).

More syncing to NetBSD.

Implements mincore(2), mlockall(2) and munlockall(2). mlockall and munlockall
are disabled for the moment.

The rest is mostly cosmetic.

branches: 1.7.8;
const mlock(2) and munlock(2)

make mmap() return void *, add MAP_FAILED

convert to void *addr

make msync() have 3 args

Add prototype for mincore(2)

From NetBSD: 960217 merge

branches: 1.1.1;
Initial revision