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.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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.\" $FreeBSD: releng/11.0/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 .