1.\" $OpenBSD: uvm_km_alloc.9,v 1.3 2024/08/24 10:47:59 mpi Exp $ 2.\" $NetBSD: uvm.9,v 1.14 2000/06/29 06:08:44 mrg Exp $ 3.\" 4.\" Copyright (c) 1998 Matthew R. Green 5.\" All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.Dd $Mdocdate: August 24 2024 $ 29.Dt UVM_KM_SUBALLOC 9 30.Os 31.Sh NAME 32.Nm uvm_km_suballoc , 33.Nm uvm_km_free 34.Nd raw kernel memory or address space allocator 35.Sh SYNOPSIS 36.In sys/param.h 37.In uvm/uvm.h 38.Fn uvm_km_suballoc "vm_map_t map" "vaddr_t *min" "vaddr_t *max " "vsize_t size" "int flags" "boolean_t fixed" "vm_map_t submap" 39.Ft void 40.Fn uvm_km_free "vm_map_t map" "vaddr_t addr" "vsize_t size" 41.Sh DESCRIPTION 42The 43.Fn uvm_km_suballoc 44function allocates submap (with the specified 45.Fa flags , 46as described above) from 47.Fa map , 48creating a new map if 49.Fa submap 50is 51.Dv NULL . 52The addresses of the submap can be specified exactly by setting the 53.Fa fixed 54argument to non-zero, which causes the 55.Fa min 56argument to specify the beginning of the address in the submap. 57If 58.Fa fixed 59is zero, any address of size 60.Fa size 61will be allocated from 62.Fa map 63and the start and end addresses returned in 64.Fa min 65and 66.Fa max . 67.Pp 68The 69.Fn uvm_km_free 70function free 71.Fa size 72bytes of memory in the kernel map, starting at address 73.Fa addr . 74.Sh SEE ALSO 75.Xr km_alloc 9 76