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.\"
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.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 21, 2003
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.Dt PMAP_CHANGE_WIRING 9
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.Os
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.Sh NAME
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.Nm pmap_change_wiring
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.Nd change physical wiring for a map or virtual address pair
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.Sh SYNOPSIS
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.In sys/param.h
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.In vm/vm.h
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.In vm/pmap.h
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.Ft void
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.Fn pmap_change_wiring "pmap_t pmap" "vm_offset_t va" "boolean_t wired"
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.Sh DESCRIPTION
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The
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.Fn pmap_change_wiring
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function changes the wiring attribute for the page at virtual address
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.Fa va
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in the physical map
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.Fa pmap .
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A wired page gets its name from being
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2004-07-05 18:13:50 +00:00
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.Dq wired
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2003-09-25 19:14:40 +00:00
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into the system page tables so that it will not be paged out.
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.Pp
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2004-07-05 18:13:50 +00:00
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The mapping must already exist in the
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.Fa pmap .
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2003-09-25 19:14:40 +00:00
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If
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.Fa wired
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is
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.Dv TRUE ,
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the map's wired page count will be incremented; if
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.Dv FALSE ,
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it will be decremented.
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.Pp
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It is typically called by the
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.Fn vm_fault_unwire
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function.
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.Sh SEE ALSO
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.Xr pmap 9
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.Sh AUTHORS
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This manual page was written by
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.An Bruce M Simpson Aq bms@spc.org .
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