2003-09-25 19:14:40 +00:00
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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_IS_MODIFIED 9
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2004-07-06 07:02:31 +00:00
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.Os
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2003-09-25 19:14:40 +00:00
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.Sh NAME
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.Nm pmap_is_modified ,
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.Nm pmap_ts_modified
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.Nd return information about physical pages
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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 boolean_t
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.Fn pmap_is_modified "vm_page_t m"
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.Ft int
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.Fn pmap_ts_referenced "vm_page_t m"
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.Sh DESCRIPTION
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The
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.Fn pmap_is_modified
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and
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.Fn pmap_ts_referenced
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functions return information about physical pages.
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.Sh RETURN VALUES
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The
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.Fn pmap_is_modified
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function returns the status of the
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2004-07-05 18:13:50 +00:00
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.Dq "page modified"
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2003-09-25 19:14:40 +00:00
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bit for the physical page
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.Fa m .
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.Pp
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The
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.Fn pmap_ts_referenced
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function returns a count of reference bits for a page
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.Fa m ,
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clearing those bits.
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It is not necessary for every reference bit to be cleared, but it is
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necessary that 0 only be returned when there are no remaining reference
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bits set on the page.
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.Sh SEE ALSO
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.Xr pmap 9 ,
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.Xr pmap_clear_modify 9 ,
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.Xr pmap_clear_reference 9
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.Sh AUTHORS
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This manual page was written by
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2014-06-26 21:44:30 +00:00
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.An Bruce M Simpson Aq Mt bms@spc.org .
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