1.\"
2.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
3.\" All rights reserved.
4.\"
5.\" Redistribution and use in source and binary forms, with or without
6.\" modification, are permitted provided that the following conditions
7.\" are met:
8.\" 1. Redistributions of source code must retain the above copyright
9.\"    notice, this list of conditions and the following disclaimer.
10.\" 2. Redistributions in binary form must reproduce the above copyright
11.\"    notice, this list of conditions and the following disclaimer in the
12.\"    documentation and/or other materials provided with the distribution.
13.\"
14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24.\" SUCH DAMAGE.
25.\"
26.Dd July 21, 2003
27.Dt PMAP_PAGE_EXISTS_QUICK 9
28.Os
29.Sh NAME
30.Nm pmap_page_exists_quick
31.Nd determine if a page exists in a physical map
32.Sh SYNOPSIS
33.In sys/param.h
34.In vm/vm.h
35.In vm/pmap.h
36.Ft boolean_t
37.Fn pmap_page_exists_quick "pmap_t pmap" "vm_page_t m"
38.Sh DESCRIPTION
39The
40.Fn pmap_page_exists_quick
41function is used to quickly determine if the page
42.Fa m
43exists in the physical map
44.Fa pmap .
45It is typically called from the VM paging code.
46.Sh IMPLEMENTATION NOTES
47The PV count used above may be changed upwards or downwards in future;
48it is only necessary that
49.Dv TRUE
50be returned for a small subset of pmaps for proper page aging.
51.Sh RETURN VALUES
52The
53.Fn pmap_page_exists_quick
54returns
55.Dv TRUE
56only if the PV entry for the physical map
57.Fa pmap
58is one of the first 16 PVs linked from the page
59.Fa m .
60.Sh SEE ALSO
61.Xr pmap 9
62.Sh AUTHORS
63This manual page was written by
64.An Bruce M Simpson Aq Mt bms@spc.org .
65