mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-21 11:13:30 +00:00
89 lines
2.7 KiB
Groff
89 lines
2.7 KiB
Groff
.\"
|
|
.\" 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 19, 2003
|
|
.Dt VM_MAP_LOOKUP 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm vm_map_lookup ,
|
|
.Nm vm_map_lookup_done
|
|
.Nd lookup the vm_object backing a given virtual region
|
|
.Sh SYNOPSIS
|
|
.In sys/param.h
|
|
.In vm/vm.h
|
|
.In vm/vm_map.h
|
|
.Ft int
|
|
.Fo vm_map_lookup
|
|
.Fa "vm_map_t *var_map" "vm_offset_t vaddr" "vm_prot_t fault_type"
|
|
.Fa "vm_map_entry_t *out_entry" "vm_object_t *object" "vm_pindex_t *pindex"
|
|
.Fa "vm_prot_t *out_prot" "boolean_t *wired"
|
|
.Fc
|
|
.Ft void
|
|
.Fn vm_map_lookup_done "vm_map_t map" "vm_map_entry_t entry"
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn vm_map_lookup
|
|
function attempts to find the
|
|
.Vt vm_object ,
|
|
page index and protection, for the given virtual address
|
|
.Fa vaddr ,
|
|
in the map
|
|
.Fa var_map ,
|
|
assuming a page fault of the type
|
|
.Fa fault_type
|
|
had occurred.
|
|
.Pp
|
|
Return values are guaranteed until
|
|
.Fn vm_map_lookup_done
|
|
is called to release the lock.
|
|
.Sh IMPLEMENTATION NOTES
|
|
The function
|
|
.Fn vm_map_lookup
|
|
acquires a read-lock on the map
|
|
.Fa *var_map ,
|
|
but does not release it.
|
|
The caller should invoke
|
|
.Fn vm_map_lookup_done
|
|
in order to release this lock.
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn vm_map_lookup
|
|
function returns
|
|
.Dv KERN_SUCCESS ,
|
|
and sets the
|
|
.Fa *object ,
|
|
.Fa *pindex ,
|
|
.Fa *out_prot ,
|
|
and
|
|
.Fa *out_entry
|
|
arguments appropriately for the hypothetical page fault.
|
|
.Sh SEE ALSO
|
|
.Xr vm_map 9
|
|
.Sh AUTHORS
|
|
This manual page was written by
|
|
.An Bruce M Simpson Aq Mt bms@spc.org .
|