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.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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.\" $FreeBSD: src/share/man/man9/pmap_is_modified.9,v 1.3.30.1.6.1 2010/12/21 17:09:25 kensmith Exp $
.\"
.Dd July 21, 2003
.Dt PMAP_IS_MODIFIED 9
.Os
.Sh NAME
.Nm pmap_is_modified ,
.Nm pmap_ts_modified
.Nd return information about physical pages
.Sh SYNOPSIS
.In sys/param.h
.In vm/vm.h
.In vm/pmap.h
.Ft boolean_t
.Fn pmap_is_modified "vm_page_t m"
.Ft int
.Fn pmap_ts_referenced "vm_page_t m"
.Sh DESCRIPTION
The
.Fn pmap_is_modified
and
.Fn pmap_ts_referenced
functions return information about physical pages.
.Sh RETURN VALUES
The
.Fn pmap_is_modified
function returns the status of the
.Dq "page modified"
bit for the physical page
.Fa m .
.Pp
The
.Fn pmap_ts_referenced
function returns a count of reference bits for a page
.Fa m ,
clearing those bits.
It is not necessary for every reference bit to be cleared, but it is
necessary that 0 only be returned when there are no remaining reference
bits set on the page.
.Sh SEE ALSO
.Xr pmap 9 ,
.Xr pmap_clear_modify 9 ,
.Xr pmap_clear_reference 9
.Sh AUTHORS
This manual page was written by
.An Bruce M Simpson Aq bms@spc.org .