1.\" $NetBSD: altmem.4,v 1.5 2014/03/18 18:20:39 riastradh Exp $ 2.\" 3.\" Copyright (c) 2009 Jared D. McNeill <jmcneill@invisible.ca> 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Neither the name of the author nor the names of any 12.\" contributors may be used to endorse or promote products derived 13.\" from this software without specific prior written permission. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS 16.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 17.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 18.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 19.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 20.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 21.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 22.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 23.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 24.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25.\" POSSIBILITY OF SUCH DAMAGE. 26.\" 27.Dd March 11, 2009 28.Dt ALTMEM 4 29.Os 30.Sh NAME 31.Nm altmem 32.Nd Alternative memory disk driver 33.Sh SYNOPSIS 34.Cd "altmem* at altmemdev?" 35.Sh DESCRIPTION 36The 37.Nm 38driver enables use of physical memory that is normally inaccessible by the 39machine-dependent 40.Xr pmap 9 41as a swap device. 42.Pp 43When an alternative memory disk device is present, this device is generally 44preferred to hard disk-based swap space. 45See the 46.Xr swapctl 8 47and 48.Xr fstab 5 49man pages for instructions on how to assign priorities to swap devices. 50.Sh FILES 51.Bl -tag -width /dev/raltmemXX -compact 52.It Pa "/dev/altmem??" 53block mode alternative memory disk devices. 54.It Pa "/dev/raltmem??" 55raw mode alternative memory disk devices. 56.El 57.Sh SEE ALSO 58.Xr md 4 , 59.Xr fstab 5 , 60.Xr swapctl 8 61.Sh HISTORY 62The 63.Nm 64device driver appeared in 65.Nx 6.0 . 66.Sh AUTHORS 67.An Jared D. McNeill Aq Mt jmcneill@NetBSD.org 68