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.\" $OpenBSD: uvm_km_alloc.9,v 1.3 2024/08/24 10:47:59 mpi Exp $
.\" $NetBSD: uvm.9,v 1.14 2000/06/29 06:08:44 mrg Exp $
.\"
.\" Copyright (c) 1998 Matthew R. Green
.\" 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 ``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 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.
.\"
.Dd $Mdocdate: August 24 2024 $
.Dt UVM_KM_SUBALLOC 9
.Os
.Sh NAME
.Nm uvm_km_suballoc ,
.Nm uvm_km_free
.Nd raw kernel memory or address space allocator
.Sh SYNOPSIS
.In sys/param.h
.In uvm/uvm.h
.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"
.Ft void
.Fn uvm_km_free "vm_map_t map" "vaddr_t addr" "vsize_t size"
.Sh DESCRIPTION
The
.Fn uvm_km_suballoc
function allocates submap (with the specified
.Fa flags ,
as described above) from
.Fa map ,
creating a new map if
.Fa submap
is
.Dv NULL .
The addresses of the submap can be specified exactly by setting the
.Fa fixed
argument to non-zero, which causes the
.Fa min
argument to specify the beginning of the address in the submap.
If
.Fa fixed
is zero, any address of size
.Fa size
will be allocated from
.Fa map
and the start and end addresses returned in
.Fa min
and
.Fa max .
.Pp
The
.Fn uvm_km_free
function free
.Fa size
bytes of memory in the kernel map, starting at address
.Fa addr .
.Sh SEE ALSO
.Xr km_alloc 9
|
