2003-09-30 00:51:31 +00:00
|
|
|
.\"
|
|
|
|
|
.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
|
|
|
|
|
.\" All rights reserved.
|
|
|
|
|
.\"
|
|
|
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
|
|
|
.\" modification, are permitted provided that the following conditions
|
|
|
|
|
.\" are met:
|
|
|
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
|
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
|
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
|
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
|
|
|
.\"
|
|
|
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
|
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
|
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
|
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
|
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
|
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
|
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
|
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
|
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
|
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
|
|
|
.\" SUCH DAMAGE.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
|
|
|
|
.Dd July 19, 2003
|
2004-07-06 06:53:42 +00:00
|
|
|
.Dt VM_MAP_WIRE 9
|
2004-07-06 07:02:31 +00:00
|
|
|
.Os
|
2003-09-30 00:51:31 +00:00
|
|
|
.Sh NAME
|
|
|
|
|
.Nm vm_map_wire ,
|
|
|
|
|
.Nm vm_map_unwire
|
|
|
|
|
.Nd manage page wiring within a virtual memory map
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In sys/param.h
|
|
|
|
|
.In vm/vm.h
|
|
|
|
|
.In vm/vm_map.h
|
|
|
|
|
.Ft int
|
|
|
|
|
.Fn vm_map_wire "vm_map_t map" "vm_offset_t start" "vm_offset_t end" "int flags"
|
|
|
|
|
.Ft int
|
2004-07-06 06:53:42 +00:00
|
|
|
.Fo vm_map_unwire
|
|
|
|
|
.Fa "vm_map_t map" "vm_offset_t start" "vm_offset_t end" "int flags"
|
|
|
|
|
.Fc
|
2003-09-30 00:51:31 +00:00
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
|
|
|
|
.Fn vm_map_wire
|
|
|
|
|
function is responsible for wiring pages in the range between
|
|
|
|
|
.Fa start
|
|
|
|
|
and
|
|
|
|
|
.Fa end
|
|
|
|
|
within the map
|
|
|
|
|
.Fa map .
|
|
|
|
|
Wired pages are locked into physical memory, and may not be paged out
|
|
|
|
|
as long as their wire count remains above zero.
|
|
|
|
|
.Pp
|
|
|
|
|
The
|
|
|
|
|
.Fn vm_map_unwire
|
|
|
|
|
function performs the corresponding unwire operation.
|
|
|
|
|
.Pp
|
|
|
|
|
The
|
|
|
|
|
.Fa flags
|
|
|
|
|
argument is a bit mask, consisting of the following flags:
|
|
|
|
|
.Pp
|
|
|
|
|
If the
|
|
|
|
|
.Dv VM_MAP_WIRE_USER
|
|
|
|
|
flag is set, the function operates within user address space.
|
|
|
|
|
.Pp
|
|
|
|
|
If the
|
|
|
|
|
.Dv VM_MAP_WIRE_HOLESOK
|
|
|
|
|
flag is set, it may operate upon an arbitrary range within the
|
|
|
|
|
address space of
|
|
|
|
|
.Fa map .
|
|
|
|
|
.Pp
|
|
|
|
|
If a contiguous range is desired, callers should explicitly express
|
|
|
|
|
their intent by specifying the
|
|
|
|
|
.Dv VM_MAP_WIRE_NOHOLES
|
|
|
|
|
flag.
|
|
|
|
|
.Sh IMPLEMENTATION NOTES
|
|
|
|
|
Both functions will attempt to acquire a lock on the map using
|
|
|
|
|
.Xr vm_map_lock 9
|
|
|
|
|
and hold it for the duration of the call.
|
|
|
|
|
If they detect
|
|
|
|
|
.Dv MAP_ENTRY_IN_TRANSITION ,
|
|
|
|
|
they will call
|
|
|
|
|
.Xr vm_map_unlock_and_wait 9
|
|
|
|
|
until the map becomes available again.
|
|
|
|
|
.Pp
|
|
|
|
|
The map could have changed during this window as it was held by another
|
|
|
|
|
consumer, therefore consumers of this interface should check for this
|
|
|
|
|
condition using the return values below.
|
|
|
|
|
.Sh RETURN VALUES
|
|
|
|
|
The
|
|
|
|
|
.Fn vm_map_wire
|
|
|
|
|
and
|
|
|
|
|
.Fn vm_map_unwire
|
|
|
|
|
functions have identical return values.
|
|
|
|
|
The functions return
|
|
|
|
|
.Dv KERN_SUCCESS
|
|
|
|
|
if all pages within the range were [un]wired successfully.
|
|
|
|
|
.Pp
|
|
|
|
|
Otherwise, if the specified range was not valid,
|
2004-07-06 06:53:42 +00:00
|
|
|
or if the map changed while the
|
|
|
|
|
.Dv MAP_ENTRY_IN_TRANSITION
|
|
|
|
|
flag was set,
|
2003-09-30 00:51:31 +00:00
|
|
|
.Dv KERN_INVALID_ADDRESS
|
|
|
|
|
is returned.
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr mlockall 2 ,
|
|
|
|
|
.Xr munlockall 2 ,
|
|
|
|
|
.Xr vm_map 9
|
|
|
|
|
.Sh AUTHORS
|
|
|
|
|
This man page was written by
|
|
|
|
|
.An Bruce M Simpson Aq bms@spc.org .
|
