.\"
.\" 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: head/share/man/man9/pmap_zero_page.9 267936 2014-06-26 21:44:30Z bapt $
.\"
.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 .