1.\" 2.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org> 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD$ 27.\" 28.Dd July 21, 2003 29.Dt PMAP_ZERO 9 30.Sh NAME 31.Nm pmap_zero_page , 32.Nm pmap_zero_area , 33.Nm pmap_zero_idle 34.Nd zero-fill a page using machine-dependent optimizations 35.Sh SYNOPSIS 36.In sys/param.h 37.In vm/vm.h 38.In vm/pmap.h 39.Ft void 40.Fn pmap_zero_page "vm_page_t m" 41.Ft void 42.Fn pmap_zero_page_area "vm_page_t m" "int off" "int size" 43.Ft void 44.Fn pmap_zero_page_idle "vm_page_t m" 45.Sh DESCRIPTION 46The 47.Fn pmap_zero_page 48function zero-fills an entire page using machine-dependent optimizations. 49The 50.Fn pmap_zero_page_area 51function is used to zero-fill an area of a page. 52The range specified must not cross a page boundary; it must be contained 53entirely within a single page. 54.Pp 55The 56.Fn pmap_zero_page_idle 57interface is used by the 58.Em vm_pagezero 59process. 60The system-wide 61.Fa Giant 62lock should not be required to be held in order to call this interface. 63.Sh IMPLEMENTATION NOTES 64This function is required to be implemented for each architecture supported by 65.Fx . 66.Sh SEE ALSO 67.Xr bzero 3 , 68.Xr pmap 9 69.Sh AUTHORS 70This manual page was written by 71.An Bruce M Simpson Aq bms@spc.org . 72