79 lines
2.5 KiB
Groff
79 lines
2.5 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_FINDSPACE 9
|
|
.Os
|
|
.Sh NAME
|
|
.Nm vm_map_findspace
|
|
.Nd find a free region within a map
|
|
.Sh SYNOPSIS
|
|
.In sys/param.h
|
|
.In vm/vm.h
|
|
.In vm/vm_map.h
|
|
.Ft int
|
|
.Fo vm_map_findspace
|
|
.Fa "vm_map_t map" "vm_offset_t start" "vm_size_t length" "vm_offset_t *addr"
|
|
.Fc
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Fn vm_map_findspace
|
|
function attempts to find a region with sufficient space in the
|
|
.Fa map
|
|
for an object of size
|
|
.Fa length
|
|
at the address
|
|
.Fa addr .
|
|
.Sh IMPLEMENTATION NOTES
|
|
It is the caller's responsibility to obtain a lock on the
|
|
.Fa map
|
|
using
|
|
.Xr vm_map_lock 9
|
|
before calling this function.
|
|
.Pp
|
|
This routine may call
|
|
.Xr pmap_growkernel 9
|
|
to grow the kernel's address space, if and only if the mapping is being
|
|
made within the kernel address space, and if insufficient space remains
|
|
in the
|
|
.Va kernel_map .
|
|
.Sh RETURN VALUES
|
|
The
|
|
.Fn vm_map_findspace
|
|
function returns the value 0 if successful, and
|
|
.Fa *addr
|
|
will contain the first virtual address in the found region;
|
|
otherwise, the value 1 is returned.
|
|
.Sh SEE ALSO
|
|
.Xr pmap_growkernel 9 ,
|
|
.Xr vm_map 9 ,
|
|
.Xr vm_map_entry_resize_free 9 ,
|
|
.Xr vm_map_lock 9
|
|
.Sh AUTHORS
|
|
This manual page was written by
|
|
.An Bruce M Simpson Aq bms@spc.org .
|