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.Dd July 19, 2003 27.Dt VM_MAP_FINDSPACE 9 28.Os 29.Sh NAME 30.Nm vm_map_findspace 31.Nd find a free region within a map 32.Sh SYNOPSIS 33.In sys/param.h 34.In vm/vm.h 35.In vm/vm_map.h 36.Ft int 37.Fo vm_map_findspace 38.Fa "vm_map_t map" "vm_offset_t start" "vm_size_t length" "vm_offset_t *addr" 39.Fc 40.Sh DESCRIPTION 41The 42.Fn vm_map_findspace 43function attempts to find a region with sufficient space in the 44.Fa map 45for an object of size 46.Fa length 47at the address 48.Fa addr . 49.Sh IMPLEMENTATION NOTES 50It is the caller's responsibility to obtain a lock on the 51.Fa map 52using 53.Xr vm_map_lock 9 54before calling this function. 55.Pp 56This routine may call 57.Xr pmap_growkernel 9 58to grow the kernel's address space, if and only if the mapping is being 59made within the kernel address space, and if insufficient space remains 60in the 61.Va kernel_map . 62.Sh RETURN VALUES 63The 64.Fn vm_map_findspace 65function returns the value 0 if successful, and 66.Fa *addr 67will contain the first virtual address in the found region; 68otherwise, the value 1 is returned. 69.Sh SEE ALSO 70.Xr pmap_growkernel 9 , 71.Xr vm_map 9 , 72.Xr vm_map_entry_resize_free 9 , 73.Xr vm_map_lock 9 74.Sh AUTHORS 75This manual page was written by 76.An Bruce M Simpson Aq Mt bms@spc.org . 77