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 19, 2003 29.Dt VM_MAP_FINDSPACE 9 30.Os 31.Sh NAME 32.Nm vm_map_findspace 33.Nd find a free region within a map 34.Sh SYNOPSIS 35.In sys/param.h 36.In vm/vm.h 37.In vm/vm_map.h 38.Ft int 39.Fo vm_map_findspace 40.Fa "vm_map_t map" "vm_offset_t start" "vm_size_t length" "vm_offset_t *addr" 41.Fc 42.Sh DESCRIPTION 43The 44.Fn vm_map_findspace 45function attempts to find a region with sufficient space in the 46.Fa map 47for an object of size 48.Fa length 49at the address 50.Fa addr . 51.Sh IMPLEMENTATION NOTES 52It is the caller's responsibility to obtain a lock on the 53.Fa map 54using 55.Xr vm_map_lock 9 56before calling this function. 57.Pp 58This routine may call 59.Xr pmap_growkernel 9 60to grow the kernel's address space, if and only if the mapping is being 61made within the kernel address space, and if insufficient space remains 62in the 63.Va kernel_map . 64.Sh RETURN VALUES 65The 66.Fn vm_map_findspace 67function returns the value 0 if successful, and 68.Fa *addr 69will contain the first virtual address in the found region; 70otherwise, the value 1 is returned. 71.Sh SEE ALSO 72.Xr pmap_growkernel 9 , 73.Xr vm_map 9 , 74.Xr vm_map_entry_resize_free 9 , 75.Xr vm_map_lock 9 76.Sh AUTHORS 77This manual page was written by 78.An Bruce M Simpson Aq Mt bms@spc.org . 79