1 | /* $NetBSD: md.h,v 1.11 2009/12/14 03:11:22 uebayasi Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 1995 Gordon W. Ross |
5 | * All rights reserved. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions |
9 | * are met: |
10 | * 1. Redistributions of source code must retain the above copyright |
11 | * notice, this list of conditions and the following disclaimer. |
12 | * 2. Redistributions in binary form must reproduce the above copyright |
13 | * notice, this list of conditions and the following disclaimer in the |
14 | * documentation and/or other materials provided with the distribution. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | */ |
27 | |
28 | #ifndef _SYS_DEV_MD_H_ |
29 | #define _SYS_DEV_MD_H_ |
30 | |
31 | /* |
32 | * Memory-disk ioctl functions: |
33 | */ |
34 | |
35 | #include <sys/ioccom.h> |
36 | |
37 | struct md_conf { |
38 | void *md_addr; |
39 | size_t md_size; |
40 | int md_type; |
41 | }; |
42 | |
43 | #define MD_GETCONF _IOR('r', 0, struct md_conf) /* get unit config */ |
44 | #define MD_SETCONF _IOW('r', 1, struct md_conf) /* set unit config */ |
45 | |
46 | /* |
47 | * There are three configurations supported for each unit, |
48 | * reflected in the value of the md_type field: |
49 | */ |
50 | #define MD_UNCONFIGURED 0 |
51 | /* |
52 | * Not yet configured. Open returns ENXIO. |
53 | */ |
54 | #define MD_KMEM_FIXED 1 |
55 | /* |
56 | * Disk image resident in kernel (patched in or loaded). |
57 | * Requires that the function: md_set_kmem() is called to |
58 | * attach the (initialized) kernel memory to be used by the |
59 | * device. It can be initialized by an "open hook" if this |
60 | * driver is compiled with the MD_OPEN_HOOK option. |
61 | * No attempt will ever be made to free this memory. |
62 | */ |
63 | #define MD_KMEM_ALLOCATED 2 |
64 | /* |
65 | * Small, wired-down chunk of kernel memory obtained from |
66 | * kmem_alloc(). The allocation is performed by an ioctl |
67 | * call on the raw partition. |
68 | */ |
69 | #define MD_UMEM_SERVER 3 |
70 | /* |
71 | * Indirect access to user-space of a user-level server. |
72 | * (Like the MFS hack, but better! 8^) Device operates |
73 | * only while the server has the raw partition open and |
74 | * continues to service I/O requests. The process that |
75 | * does this setconf will become the I/O server. This |
76 | * configuration type can be disabled using: |
77 | * options MEMORY_DISK_SERVER=0 |
78 | */ |
79 | |
80 | #ifdef _KERNEL |
81 | /* |
82 | * If the option MEMORY_DISK_HOOKS is on, then these functions are |
83 | * called by the ramdisk driver to allow machine-dependent to |
84 | * match/configure and/or load each ramdisk unit. |
85 | */ |
86 | extern void md_attach_hook(int, struct md_conf *); |
87 | extern void md_open_hook(int, struct md_conf *); |
88 | extern void md_root_setconf(char *, size_t); |
89 | |
90 | extern int md_is_root; |
91 | #endif /* _KERNEL */ |
92 | |
93 | #endif /* _SYS_DEV_MD_H_ */ |
94 | |