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_INIT 9 30.Sh NAME 31.Nm pmap_init , 32.Nm pmap_init2 33.Nd initialize the pmap subsystem 34.Sh SYNOPSIS 35.In sys/param.h 36.In vm/vm.h 37.In vm/pmap.h 38.Ft void 39.Fn pmap_init "vm_paddr_t phys_start" "vm_paddr_t phys_end" 40.Ft void 41.Fn pmap_init2 "void" 42.Sh DESCRIPTION 43The 44.Fn pmap_init 45function initializes the 46.Xr pmap 9 47sub-system. 48It is called during system initialization by 49.Fn vm_init , 50to initialize any structures that the 51.Nm 52system needs in order to map between physical and virtual memory. 53.Pp 54The 55.Fn pmap_init 56supports discontiguous physical memory in a fairly consistent way. 57The module will manage the range of physical pages between 58.Fa phys_start 59and 60.Fa phys_end . 61.Pp 62The 63.Fn pmap_init2 64function initializes a zone for the PV entries. 65These are used to implement page sharing at the physical level. 66A high water mark is set so that the system can recover from 67excessive numbers of PV entries. 68.Sh SEE ALSO 69.Xr pmap 9 70.Sh AUTHORS 71This manual page was written by 72.An Bruce M Simpson Aq bms@spc.org . 73