xref: /freebsd/usr.bin/mkimg/bsd.c (revision cc3f4b99653c34ae64f8a1fddea370abefef680e)
1 /*-
2  * Copyright (c) 2014 Juniper Networks, Inc.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <sys/types.h>
31 #include <sys/disklabel.h>
32 #include <sys/endian.h>
33 #include <sys/errno.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <unistd.h>
37 
38 #include "mkimg.h"
39 #include "scheme.h"
40 
41 #ifndef FS_NANDFS
42 #define	FS_NANDFS	30
43 #endif
44 
45 static struct mkimg_alias bsd_aliases[] = {
46     {	ALIAS_FREEBSD_NANDFS, ALIAS_INT2TYPE(FS_NANDFS) },
47     {	ALIAS_FREEBSD_SWAP, ALIAS_INT2TYPE(FS_SWAP) },
48     {	ALIAS_FREEBSD_UFS, ALIAS_INT2TYPE(FS_BSDFFS) },
49     {	ALIAS_FREEBSD_VINUM, ALIAS_INT2TYPE(FS_VINUM) },
50     {	ALIAS_FREEBSD_ZFS, ALIAS_INT2TYPE(FS_ZFS) },
51     {	ALIAS_NONE, 0 }
52 };
53 
54 static u_int
55 bsd_metadata(u_int where)
56 {
57 	u_int secs;
58 
59 	secs = BBSIZE / secsz;
60 	return ((where == SCHEME_META_IMG_START) ? secs : 0);
61 }
62 
63 static int
64 bsd_write(int fd, lba_t imgsz, void *bootcode)
65 {
66 	u_char *buf, *p;
67 	struct disklabel *d;
68 	struct partition *dp;
69 	struct part *part;
70 	int error, n;
71 	uint16_t checksum;
72 
73 	buf = malloc(BBSIZE);
74 	if (buf == NULL)
75 		return (ENOMEM);
76 	if (bootcode != NULL) {
77 		memcpy(buf, bootcode, BBSIZE);
78 		memset(buf + secsz, 0, secsz);
79 	} else
80 		memset(buf, 0, BBSIZE);
81 
82 	imgsz = ncyls * nheads * nsecs;
83 	ftruncate(fd, imgsz * secsz);
84 
85 	d = (void *)(buf + secsz);
86 	le32enc(&d->d_magic, DISKMAGIC);
87 	le32enc(&d->d_secsize, secsz);
88 	le32enc(&d->d_nsectors, nsecs);
89 	le32enc(&d->d_ntracks, nheads);
90 	le32enc(&d->d_ncylinders, ncyls);
91 	le32enc(&d->d_secpercyl, nsecs * nheads);
92 	le32enc(&d->d_secperunit, imgsz);
93 	le16enc(&d->d_rpm, 3600);
94 	le32enc(&d->d_magic2, DISKMAGIC);
95 	le16enc(&d->d_npartitions, (8 > nparts + 1) ? 8 : nparts + 1);
96 	le32enc(&d->d_bbsize, BBSIZE);
97 
98 	dp = &d->d_partitions[RAW_PART];
99 	le32enc(&dp->p_size, imgsz);
100 	STAILQ_FOREACH(part, &partlist, link) {
101 		n = part->index + ((part->index >= RAW_PART) ? 1 : 0);
102 		dp = &d->d_partitions[n];
103 		le32enc(&dp->p_size, part->size);
104 		le32enc(&dp->p_offset, part->block);
105 		dp->p_fstype = ALIAS_TYPE2INT(part->type);
106 	}
107 
108 	dp = &d->d_partitions[nparts + 1];
109 	checksum = 0;
110 	for (p = buf; p < (u_char *)dp; p += 2)
111 		checksum ^= le16dec(p);
112 	le16enc(&d->d_checksum, checksum);
113 
114 	error = mkimg_write(fd, 0, buf, BBSIZE / secsz);
115 	free(buf);
116 	return (error);
117 }
118 
119 static struct mkimg_scheme bsd_scheme = {
120 	.name = "bsd",
121 	.description = "BSD disk label",
122 	.aliases = bsd_aliases,
123 	.metadata = bsd_metadata,
124 	.write = bsd_write,
125 	.nparts = 19,
126 	.bootcode = BBSIZE,
127 	.maxsecsz = 512
128 };
129 
130 SCHEME_DEFINE(bsd_scheme);
131