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.\"
.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd July 21, 2003
.Dt PMAP 9
.Os
.Sh NAME
.Nm pmap
.Nd machine-dependent portion of virtual memory subsystem
.Sh SYNOPSIS
.In sys/param.h
.In vm/vm.h
.In vm/pmap.h
.Sh DESCRIPTION
The
.Nm
module is the machine-dependent portion of the
.Fx
VM (Virtual Memory) sub-system.
Each function documented herein must have its own
architecture-dependent implementation.
.Pp
The
.Nm
module
is responsible for managing hardware-dependent objects such as page tables,
address maps, TLBs, etc.
.Pp
Machine-dependent code must provide the header file
.In machine/pmap.h .
This file contains the definition of the
.Vt pmap
structure:
.Bd -literal -offset indent
struct pmap {
/* Contents defined by pmap implementation. */
};
typedef struct pmap *pmap_t;
.Ed
.Pp
This header file may also define other data structures used by the
.Nm
implementation.
.Pp
The header file
.In vm/pmap.h
defines a structure for tracking
.Nm
statistics (see below).
This structure is defined as:
.Bd -literal -offset indent
struct pmap_statistics {
long resident_count; /* number of mapped pages */
long wired_count; /* number of wired pages */
};
.Ed
.Pp
The implementation's
.Vt "struct pmap"
must contain an instance of this structure having the name
.Va pm_stats ,
and it must be updated by the implementation after each relevant
.Nm
operation.
.Sh SEE ALSO
.Xr pmap 9 ,
.Xr pmap_activate 9 ,
.Xr pmap_change_wiring 9 ,
.Xr pmap_clear_modify 9 ,
.Xr pmap_clear_reference 9 ,
.Xr pmap_copy 9 ,
.Xr pmap_copy_page 9 ,
.Xr pmap_enter 9 ,
.Xr pmap_extract 9 ,
.Xr pmap_extract_and_hold 9 ,
.Xr pmap_growkernel 9 ,
.Xr pmap_init 9 ,
.Xr pmap_init2 9 ,
.Xr pmap_is_modified 9 ,
.Xr pmap_is_prefaultable 9 ,
.Xr pmap_map 9 ,
.Xr pmap_mincore 9 ,
.Xr pmap_object_init_pt 9 ,
.Xr pmap_page_exists_quick 9 ,
.Xr pmap_page_init 9 ,
.Xr pmap_page_protect 9 ,
.Xr pmap_pinit 9 ,
.Xr pmap_pinit0 9 ,
.Xr pmap_pinit2 9 ,
.Xr pmap_protect 9 ,
.Xr pmap_qenter 9 ,
.Xr pmap_qremove 9 ,
.Xr pmap_release 9 ,
.Xr pmap_remove 9 ,
.Xr pmap_remove_all 9 ,
.Xr pmap_remove_pages 9 ,
.Xr pmap_resident_count 9 ,
.Xr pmap_ts_modified 9 ,
.Xr pmap_wired_count 9 ,
.Xr pmap_zero_area 9 ,
.Xr pmap_zero_idle 9 ,
.Xr pmap_zero_page 9 ,
.Xr vm_map 9
.Sh AUTHORS
This manual page was written by
.An Bruce M Simpson Aq bms@spc.org .
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