1/*	$OpenBSD: uvm_device.h,v 1.11 2014/07/11 16:35:40 jsg Exp $	*/
2/*	$NetBSD: uvm_device.h,v 1.9 2000/05/28 10:21:55 drochner Exp $	*/
3
4/*
5 * Copyright (c) 1997 Charles D. Cranor and Washington University.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * from: Id: uvm_device.h,v 1.1.2.2 1997/10/03 17:39:44 chuck Exp
29 */
30
31#ifndef _UVM_UVM_DEVICE_H_
32#define _UVM_UVM_DEVICE_H_
33
34/*
35 * uvm_device.h
36 *
37 * device handle into the VM system.
38 */
39
40/*
41 * the uvm_device structure.   object is put at the top of the data structure.
42 * this allows:
43 *   (struct uvm_device *) == (struct uvm_object *)
44 */
45
46struct uvm_device {
47	struct uvm_object u_obj;	/* the actual VM object */
48	int u_flags;			/* flags [LOCKED BY UDV_LOCK!] */
49	dev_t u_device;		/* our device */
50	LIST_ENTRY(uvm_device) u_list; /* list of device objects */
51};
52
53/*
54 * u_flags values
55 */
56
57#define UVM_DEVICE_HOLD		0x1	/* someone has a "hold" on it */
58#define UVM_DEVICE_WANTED	0x2	/* someone wants to put a "hold" on */
59
60#ifdef _KERNEL
61
62/*
63 * prototypes
64 */
65
66struct uvm_object *udv_attach(dev_t, vm_prot_t, voff_t, vsize_t);
67struct uvm_object *udv_attach_drm(dev_t, vm_prot_t, voff_t, vsize_t);
68
69#endif /* _KERNEL */
70
71#endif /* _UVM_UVM_DEVICE_H_ */
72