FreeBSD/Linux Kernel Cross Reference
sys/dev/md_root.c
1 /* $NetBSD: md_root.c,v 1.15 2008/05/02 13:02:31 ad 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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __KERNEL_RCSID(0, "$NetBSD: md_root.c,v 1.15 2008/05/02 13:02:31 ad Exp $");
34
35 #include "opt_md.h"
36
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/reboot.h>
40
41 #include <dev/md.h>
42
43 extern int boothowto;
44
45 #ifdef MEMORY_DISK_DYNAMIC
46 #ifdef MEMORY_DISK_IMAGE
47 #error MEMORY_DISK_DYNAMIC is not compatible with MEMORY_DISK_IMAGE
48 #endif
49 size_t md_root_size;
50 char *md_root_image;
51 #else /* MEMORY_DISK_DYNAMIC */
52
53 #ifdef MEMORY_DISK_IMAGE
54 #ifdef MEMORY_DISK_ROOT_SIZE
55 #error MEMORY_DISK_ROOT_SIZE is not compatible with MEMORY_DISK_IMAGE
56 #endif
57 char md_root_image[] = {
58 #include "md_root_image.h"
59 };
60 u_int32_t md_root_size = sizeof(md_root_image) & ~(DEV_BSIZE - 1);
61
62 #else /* MEMORY_DISK_IMAGE */
63
64 #ifndef MEMORY_DISK_ROOT_SIZE
65 #define MEMORY_DISK_ROOT_SIZE 512
66 #endif
67 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT)
68
69 /*
70 * This array will be patched to contain a file-system image.
71 * See the program mdsetimage(8) for details.
72 */
73 u_int32_t md_root_size = ROOTBYTES;
74 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
75 #endif /* MEMORY_DISK_IMAGE */
76 #endif /* MEMORY_DISK_DYNAMIC */
77
78 #ifndef MEMORY_RBFLAGS
79 #define MEMORY_RBFLAGS RB_SINGLE /* force single user */
80 #endif
81
82 #ifdef MEMORY_DISK_DYNAMIC
83 void
84 md_root_setconf(char *addr, size_t size)
85 {
86 md_is_root = 1;
87 md_root_image = addr;
88 md_root_size = size;
89 }
90 #endif /* MEMORY_DISK_DYNAMIC */
91
92 /*
93 * This is called during pseudo-device attachment.
94 */
95 void
96 md_attach_hook(int unit, struct md_conf *md)
97 {
98 char pbuf[9];
99
100 if (unit == 0 && md_is_root) {
101 /* Setup root ramdisk */
102 md->md_addr = (void *)md_root_image;
103 md->md_size = (size_t)md_root_size;
104 md->md_type = MD_KMEM_FIXED;
105 format_bytes(pbuf, sizeof(pbuf), md->md_size);
106 aprint_verbose("md%d: internal %s image area\n", unit, pbuf);
107 }
108 }
109
110 /*
111 * This is called during open (i.e. mountroot)
112 */
113 void
114 md_open_hook(int unit, struct md_conf *md)
115 {
116
117 if (unit == 0 && md_is_root) {
118 /* The root ramdisk only works single-user. */
119 boothowto |= MEMORY_RBFLAGS;
120 }
121 }
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