8019c643f1
Include documentation of alc's new pmap_extract_and_hold() function. Reviewed by: hmp Approved by: jake (mentor)
73 lines
2.4 KiB
Groff
73 lines
2.4 KiB
Groff
.\"
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.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 21, 2003
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.Dt PMAP_INIT 9
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.Sh NAME
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.Nm pmap_init ,
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.Nm pmap_init2
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.Nd initialize the pmap subsystem
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.Sh SYNOPSIS
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.In sys/param.h
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.In vm/vm.h
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.In vm/pmap.h
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.Ft void
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.Fn pmap_init "vm_paddr_t phys_start" "vm_paddr_t phys_end"
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.Ft void
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.Fn pmap_init2 "void"
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.Sh DESCRIPTION
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The
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.Fn pmap_init
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function initializes the
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.Xr pmap 9
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sub-system.
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It is called during system initialization by
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.Fn vm_init ,
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to initialize any structures that the
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.Nm
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system needs in order to map between physical and virtual memory.
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.Pp
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The
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.Fn pmap_init
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supports discontiguous physical memory in a fairly consistent way.
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The module will manage the range of physical pages between
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.Fa phys_start
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and
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.Fa phys_end .
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.Pp
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The
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.Fn pmap_init2
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function initializes a zone for the PV entries.
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These are used to implement page sharing at the physical level.
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A high water mark is set so that the system can recover from
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excessive numbers of PV entries.
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.Sh SEE ALSO
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.Xr pmap 9
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.Sh AUTHORS
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This manual page was written by
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.An Bruce M Simpson Aq bms@spc.org .
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