1 /* $OpenBSD: ramdisk.h,v 1.5 2002/03/14 01:26:52 millert Exp $ */
2 /* $NetBSD: ramdisk.h,v 1.4 1996/03/22 23:02:04 gwr Exp $ */
3
4 /*
5 * Copyright (c) 1995 Gordon W. Ross
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 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
18 * 4. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by Gordon W. Ross
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * RAM-disk ioctl functions:
36 */
37
38 #include <sys/ioccom.h>
39
40 struct rd_conf {
41 caddr_t rd_addr;
42 size_t rd_size;
43 int rd_type;
44 };
45
46 #define RD_GETCONF _IOR('r', 0, struct rd_conf) /* get unit config */
47 #define RD_SETCONF _IOW('r', 1, struct rd_conf) /* set unit config */
48
49 /*
50 * There are three configurations supported for each unit,
51 * reflected in the value of the rd_type field:
52 */
53 #define RD_UNCONFIGURED 0
54 /*
55 * Not yet configured. Open returns ENXIO.
56 */
57 #define RD_KMEM_FIXED 1
58 /*
59 * Disk image resident in kernel (patched in or loaded).
60 * Requires that the function: rd_set_kmem() is called to
61 * attach the (initialized) kernel memory to be used by the
62 * device. It can be initialized by an "open hook" if this
63 * driver is compiled with the RD_OPEN_HOOK option.
64 * No attempt will ever be made to free this memory.
65 */
66 #define RD_KMEM_ALLOCATED 2
67 /*
68 * Small, wired-down chunk of kernel memory obtained from
69 * kmem_alloc(). The allocation is performed by an ioctl
70 * call on the "control" unit (regular unit + 16)
71 */
72 #define RD_UMEM_SERVER 3
73 /*
74 * Indirect access to user-space of a user-level server.
75 * (Like the MFS hack, but better! 8^) Device operates
76 * only while the server has the control device open and
77 * continues to service I/O requests. The process that
78 * does this setconf will become the I/O server. This
79 * configuration type can be disabled using:
80 * option RAMDISK_SERVER=0
81 */
82
83 #ifdef _KERNEL
84 /*
85 * If the option RAMDISK_HOOKS is on, then these functions are
86 * called by the ramdisk driver to allow machine-dependent to
87 * match/configure and/or load each ramdisk unit.
88 */
89 extern void rd_attach_hook(int unit, struct rd_conf *);
90 extern void rd_open_hook(int unit, struct rd_conf *);
91 #endif