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1 /*
2 * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
3 * The President and Fellows of Harvard College.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifndef _DEVICE_H_
31 #define _DEVICE_H_
32
33 /*
34 * Devices.
35 */
36
37
38 struct uio; /* in <uio.h> */
39
40 /*
41 * Filesystem-namespace-accessible device.
42 * d_io is for both reads and writes; the uio indicates the direction.
43 */
44 struct device {
45 int (*d_open)(struct device *, int flags_from_open);
46 int (*d_close)(struct device *);
47 int (*d_io)(struct device *, struct uio *);
48 int (*d_ioctl)(struct device *, int op, userptr_t data);
49
50 blkcnt_t d_blocks;
51 blksize_t d_blocksize;
52
53 dev_t d_devnumber; /* serial number for this device */
54
55 void *d_data; /* device-specific data */
56 };
57
58 /* Create vnode for a vfs-level device. */
59 struct vnode *dev_create_vnode(struct device *dev);
60
61
62 /* Initialization functions for builtin vfs-level devices. */
63 void devnull_create(void);
64
65 /* Function that kicks off device probe and attach. */
66 void dev_bootstrap(void);
67
68
69 #endif /* _DEVICE_H_ */