1 /* $OpenBSD: uvm_device.h,v 1.8 2002/03/14 01:27:18 millert Exp $ */
2 /* $NetBSD: uvm_device.h,v 1.9 2000/05/28 10:21:55 drochner Exp $ */
3
4 /*
5 *
6 * Copyright (c) 1997 Charles D. Cranor and Washington University.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by Charles D. Cranor and
20 * Washington University.
21 * 4. The name of the author may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
28 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
29 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
33 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 * from: Id: uvm_device.h,v 1.1.2.2 1997/10/03 17:39:44 chuck Exp
36 */
37
38 #ifndef _UVM_UVM_DEVICE_H_
39 #define _UVM_UVM_DEVICE_H_
40
41 /*
42 * uvm_device.h
43 *
44 * device handle into the VM system.
45 */
46
47 /*
48 * the uvm_device structure. object is put at the top of the data structure.
49 * this allows:
50 * (struct uvm_device *) == (struct uvm_object *)
51 */
52
53 struct uvm_device {
54 struct uvm_object u_obj; /* the actual VM object */
55 int u_flags; /* flags [LOCKED BY UDV_LOCK!] */
56 dev_t u_device; /* our device */
57 LIST_ENTRY(uvm_device) u_list; /* list of device objects */
58 };
59
60 /*
61 * u_flags values
62 */
63
64 #define UVM_DEVICE_HOLD 0x1 /* someone has a "hold" on it */
65 #define UVM_DEVICE_WANTED 0x2 /* someone wants to put a "hold" on */
66
67 #ifdef _KERNEL
68
69 /*
70 * prototypes
71 */
72
73 struct uvm_object *udv_attach(void *, vm_prot_t, voff_t, vsize_t);
74
75 #endif /* _KERNEL */
76
77 #endif /* _UVM_UVM_DEVICE_H_ */