2003-09-25 19:14:40 +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 21, 2003
|
|
|
|
|
.Dt PMAP_PAGE_EXISTS_QUICK 9
|
2004-07-06 07:02:31 +00:00
|
|
|
.Os
|
2003-09-25 19:14:40 +00:00
|
|
|
.Sh NAME
|
|
|
|
|
.Nm pmap_page_exists_quick
|
|
|
|
|
.Nd determine if a page exists in a physical map
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In sys/param.h
|
|
|
|
|
.In vm/vm.h
|
|
|
|
|
.In vm/pmap.h
|
|
|
|
|
.Ft boolean_t
|
|
|
|
|
.Fn pmap_page_exists_quick "pmap_t pmap" "vm_page_t m"
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
The
|
|
|
|
|
.Fn pmap_page_exists_quick
|
|
|
|
|
function is used to quickly determine if the page
|
|
|
|
|
.Fa m
|
|
|
|
|
exists in the physical map
|
|
|
|
|
.Fa pmap .
|
|
|
|
|
It is typically called from the VM paging code.
|
2005-01-21 08:36:40 +00:00
|
|
|
.Sh IMPLEMENTATION NOTES
|
|
|
|
|
The PV count used above may be changed upwards or downwards in future;
|
|
|
|
|
it is only necessary that
|
|
|
|
|
.Dv TRUE
|
|
|
|
|
be returned for a small subset of pmaps for proper page aging.
|
2003-09-25 19:14:40 +00:00
|
|
|
.Sh RETURN VALUES
|
|
|
|
|
The
|
|
|
|
|
.Fn pmap_page_exists_quick
|
|
|
|
|
returns
|
|
|
|
|
.Dv TRUE
|
|
|
|
|
only if the PV entry for the physical map
|
|
|
|
|
.Fa pmap
|
|
|
|
|
is one of the first 16 PVs linked from the page
|
|
|
|
|
.Fa m .
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr pmap 9
|
|
|
|
|
.Sh AUTHORS
|
|
|
|
|
This manual page was written by
|
|
|
|
|
.An Bruce M Simpson Aq bms@spc.org .
|
