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.Os 31.Sh NAME 32.Nm pmap_zero_page , 33.Nm pmap_zero_area , 34.Nm pmap_zero_idle 35.Nd zero-fill a page using machine-dependent optimizations 36.Sh SYNOPSIS 37.In sys/param.h 38.In vm/vm.h 39.In vm/pmap.h 40.Ft void 41.Fn pmap_zero_page "vm_page_t m" 42.Ft void 43.Fn pmap_zero_page_area "vm_page_t m" "int off" "int size" 44.Ft void 45.Fn pmap_zero_page_idle "vm_page_t m" 46.Sh DESCRIPTION 47The 48.Fn pmap_zero_page 49function zero-fills an entire page using machine-dependent optimizations. 50The 51.Fn pmap_zero_page_area 52function is used to zero-fill an area of a page. 53The range specified must not cross a page boundary; it must be contained 54entirely within a single page. 55.Pp 56The 57.Fn pmap_zero_page_idle 58interface is used by the 59.Nm vm_pagezero 60process. 61The system-wide 62.Va Giant 63lock should not be required to be held in order to call this interface. 64.Sh IMPLEMENTATION NOTES 65This function is required to be implemented for each architecture supported by 66.Fx . 67.Sh SEE ALSO 68.Xr bzero 3 , 69.Xr pmap 9 70.Sh AUTHORS 71This manual page was written by 72.An Bruce M Simpson Aq bms@spc.org . 73