Annotation of sys/dev/ramdisk.h, Revision 1.1.1.1
1.1 nbrk 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
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