FreeBSD/Linux Kernel Cross Reference
sys/dev/md_root.c
1 /* $NetBSD: md_root.c,v 1.10 2003/04/29 01:52:59 thorpej Exp $ */
2
3 /*-
4 * Copyright (c) 1996 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Gordon W. Ross.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #include <sys/cdefs.h>
40 __KERNEL_RCSID(0, "$NetBSD: md_root.c,v 1.10 2003/04/29 01:52:59 thorpej Exp $");
41
42 #include "opt_md.h"
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/reboot.h>
47
48 #include <dev/md.h>
49
50 extern int boothowto;
51
52 #ifdef MEMORY_DISK_DYNAMIC
53 #ifdef MEMORY_DISK_IMAGE
54 #error MEMORY_DISK_DYNAMIC is not compatible with MEMORY_DISK_IMAGE
55 #endif
56 size_t md_root_size;
57 char *md_root_image;
58 #else /* MEMORY_DISK_DYNAMIC */
59
60 #ifdef MEMORY_DISK_IMAGE
61 #ifdef MEMORY_DISK_ROOT_SIZE
62 #error MEMORY_DISK_ROOT_SIZE is not compatible with MEMORY_DISK_IMAGE
63 #endif
64 char md_root_image[] = {
65 #include "md_root_image.h"
66 };
67 u_int32_t md_root_size = sizeof(md_root_image) & ~(DEV_BSIZE - 1);
68
69 #else /* MEMORY_DISK_IMAGE */
70
71 #ifndef MEMORY_DISK_ROOT_SIZE
72 #define MEMORY_DISK_ROOT_SIZE 512
73 #endif
74 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT)
75
76 /*
77 * This array will be patched to contain a file-system image.
78 * See the program mdsetimage(8) for details.
79 */
80 u_int32_t md_root_size = ROOTBYTES;
81 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
82 #endif /* MEMORY_DISK_IMAGE */
83 #endif /* MEMORY_DISK_DYNAMIC */
84
85 #ifndef MEMORY_RBFLAGS
86 #define MEMORY_RBFLAGS RB_SINGLE /* force single user */
87 #endif
88
89 #ifdef MEMORY_DISK_DYNAMIC
90 void
91 md_root_setconf(char *addr, size_t size)
92 {
93 md_root_image = addr;
94 md_root_size = size;
95 }
96 #endif /* MEMORY_DISK_DYNAMIC */
97
98 /*
99 * This is called during pseudo-device attachment.
100 */
101 void
102 md_attach_hook(int unit, struct md_conf *md)
103 {
104 char pbuf[9];
105
106 if (unit == 0) {
107 /* Setup root ramdisk */
108 md->md_addr = (caddr_t)md_root_image;
109 md->md_size = (size_t)md_root_size;
110 md->md_type = MD_KMEM_FIXED;
111 format_bytes(pbuf, sizeof(pbuf), md->md_size);
112 aprint_normal("md%d: internal %s image area\n", unit, pbuf);
113 }
114 }
115
116 /*
117 * This is called during open (i.e. mountroot)
118 */
119 void
120 md_open_hook(int unit, struct md_conf *md)
121 {
122
123 if (unit == 0) {
124 /* The root ramdisk only works single-user. */
125 boothowto |= MEMORY_RBFLAGS;
126 }
127 }
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