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