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.\" $FreeBSD$ 27.\" 28.Dd July 21, 2003 29.Dt PMAP_CHANGE_WIRING 9 30.Os 31.Sh NAME 32.Nm pmap_change_wiring 33.Nd change physical wiring for a map or virtual address pair 34.Sh SYNOPSIS 35.In sys/param.h 36.In vm/vm.h 37.In vm/pmap.h 38.Ft void 39.Fn pmap_change_wiring "pmap_t pmap" "vm_offset_t va" "boolean_t wired" 40.Sh DESCRIPTION 41The 42.Fn pmap_change_wiring 43function changes the wiring attribute for the page at virtual address 44.Fa va 45in the physical map 46.Fa pmap . 47A wired page gets its name from being 48.Dq wired 49into the system page tables so that it will not be paged out. 50.Pp 51The mapping must already exist in the 52.Fa pmap . 53If 54.Fa wired 55is 56.Dv TRUE , 57the map's wired page count will be incremented; if 58.Dv FALSE , 59it will be decremented. 60.Pp 61It is typically called by the 62.Fn vm_fault_unwire 63function. 64.Sh SEE ALSO 65.Xr pmap 9 66.Sh AUTHORS 67This manual page was written by 68.An Bruce M Simpson Aq bms@spc.org . 69