1 /* $NetBSD: md_root.c,v 1.19 2015/08/30 05:24:03 uebayasi 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 1.19 2015/08/30 05:24:03 uebayasi Exp $");
34
35 #include "opt_md.h"
36 #include "opt_memory_disk_image.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/reboot.h>
41
42 #include <dev/md.h>
43
44 #ifdef MEMORY_DISK_DYNAMIC
45 #ifdef makeoptions_MEMORY_DISK_IMAGE
46 #error MEMORY_DISK_DYNAMIC is not compatible with MEMORY_DISK_IMAGE
47 #endif
48 size_t md_root_size;
49 char *md_root_image;
50 #else /* MEMORY_DISK_DYNAMIC */
51
52 #ifdef makeoptions_MEMORY_DISK_IMAGE
53 #ifdef MEMORY_DISK_ROOT_SIZE
54 #error MEMORY_DISK_ROOT_SIZE is not compatible with MEMORY_DISK_IMAGE
55 #endif
56 char md_root_image[] = {
57 #include "md_root_image.h"
58 };
59 uint32_t md_root_size = sizeof(md_root_image) & ~(DEV_BSIZE - 1);
60
61 #else /* makeoptions_MEMORY_DISK_IMAGE */
62
63 #ifndef MEMORY_DISK_ROOT_SIZE
64 #define MEMORY_DISK_ROOT_SIZE 512
65 #endif
66 #define ROOTBYTES (MEMORY_DISK_ROOT_SIZE << DEV_BSHIFT)
67
68 /*
69 * This array will be patched to contain a file-system image.
70 * See the program mdsetimage(8) for details.
71 */
72 uint32_t md_root_size = ROOTBYTES;
73 char md_root_image[ROOTBYTES] = "|This is the root ramdisk!\n";
74 #endif /* makeoptions_MEMORY_DISK_IMAGE */
75 #endif /* MEMORY_DISK_DYNAMIC */
76
77 #ifndef MEMORY_DISK_RBFLAGS
78 #define MEMORY_DISK_RBFLAGS RB_AUTOBOOT /* default boot mode */
79 #endif
80
81 #ifdef MEMORY_DISK_DYNAMIC
82 void
md_root_setconf(char * addr,size_t size)83 md_root_setconf(char *addr, size_t size)
84 {
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 #define PBUFLEN sizeof("99999 KB")
96
97 void
md_attach_hook(int unit,struct md_conf * md)98 md_attach_hook(int unit, struct md_conf *md)
99 {
100 char pbuf[PBUFLEN];
101
102 if (unit == 0 && md_is_root) {
103 /* Setup root ramdisk */
104 md->md_addr = (void *)md_root_image;
105 md->md_size = (size_t)md_root_size;
106 md->md_type = MD_KMEM_FIXED;
107 format_bytes(pbuf, sizeof(pbuf), md->md_size);
108 aprint_verbose("md%d: internal %s image area\n", unit, pbuf);
109 }
110 }
111
112 /*
113 * This is called during open (i.e. mountroot)
114 */
115 void
md_open_hook(int unit,struct md_conf * md)116 md_open_hook(int unit, struct md_conf *md)
117 {
118
119 if (unit == 0 && md_is_root) {
120 boothowto |= MEMORY_DISK_RBFLAGS;
121 }
122 }
123