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.\" $OpenBSD: uvm_vslock.9,v 1.2 2019/12/06 11:09:47 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: December 6 2019 $
.Dt UVM_VSLOCK 9
.Os
.Sh NAME
.Nm uvm_vslock ,
.Nm uvm_vsunlock ,
.Nm uvm_vslock_device ,
.Nm uvm_vsunlock_device
.Nd wire user memory for I/O
.Sh SYNOPSIS
.In uvm/uvm_extern.h
.Ft void
.Fn uvm_vslock "struct proc *p" "caddr_t addr" "size_t len" \
"vm_prot_t access_type"
.Ft void
.Fn uvm_vsunlock "struct proc *p" "caddr_t addr" "size_t len"
.Ft int
.Fn uvm_vslock_device "struct proc *p" "void *addr" "size_t len" \
"vm_prot_t access_type" "void **retp"
.Ft void
.Fn uvm_vsunlock_device "struct proc *p" "void *addr" "size_t len" "void *map"
.Sh DESCRIPTION
The
.Fn uvm_vslock
family of functions
control the wiring and unwiring of pages for process
.Fa p
from
.Fa addr
to
.Fa addr + len .
The
.Fa access_type
argument is passed to
.Xr uvm_fault 9 .
.Pp
.Fn uvm_vslock_device
also checks if the pages are DMA reachable.
When they aren't, it bounces their content into a newly created mapping
returned in
.Fa retp .
.Fn uvm_vsunlock_device
will release this memory mapping pointed by
.Fa map .
.Sh SEE ALSO
.Xr uvm_fault 9
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