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+.\"
+.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 21, 2003
+.Dt PMAP_ZERO 9
+.Os
+.Sh NAME
+.Nm pmap_zero_page ,
+.Nm pmap_zero_area ,
+.Nm pmap_zero_idle
+.Nd zero-fill a page using machine-dependent optimizations
+.Sh SYNOPSIS
+.In sys/param.h
+.In vm/vm.h
+.In vm/pmap.h
+.Ft void
+.Fn pmap_zero_page "vm_page_t m"
+.Ft void
+.Fn pmap_zero_page_area "vm_page_t m" "int off" "int size"
+.Ft void
+.Fn pmap_zero_page_idle "vm_page_t m"
+.Sh DESCRIPTION
+The
+.Fn pmap_zero_page
+function zero-fills an entire page using machine-dependent optimizations.
+The
+.Fn pmap_zero_page_area
+function is used to zero-fill an area of a page.
+The range specified must not cross a page boundary; it must be contained
+entirely within a single page.
+.Pp
+The
+.Fn pmap_zero_page_idle
+interface is used by the
+.Nm vm_pagezero
+process.
+The system-wide
+.Va Giant
+lock should not be required to be held in order to call this interface.
+.Sh IMPLEMENTATION NOTES
+This function is required to be implemented for each architecture supported by
+.Fx .
+.Sh SEE ALSO
+.Xr bzero 3 ,
+.Xr pmap 9
+.Sh AUTHORS
+This manual page was written by
+.An Bruce M Simpson Aq Mt bms@spc.org .