2 * Copyright (c) 2014 Juniper Networks, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/types.h>
31 #include <sys/diskmbr.h>
32 #include <sys/endian.h>
33 #include <sys/errno.h>
43 #define DOSPTYP_FAT32 0x0b
46 static struct mkimg_alias ebr_aliases[] = {
47 { ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) },
48 { ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) },
53 ebr_metadata(u_int where, lba_t blk)
56 blk += (where == SCHEME_META_PART_BEFORE) ? 1 : 0;
57 return (round_track(blk));
61 ebr_chs(u_char *cyl, u_char *hd, u_char *sec, uint32_t lba __unused)
64 *cyl = 0xff; /* XXX */
66 *sec = 0xff; /* XXX */
70 ebr_write(lba_t imgsz __unused, void *bootcode __unused)
73 struct dos_partition *dp;
74 struct part *part, *next;
81 memset(ebr, 0, secsz);
82 le16enc(ebr + DOSMAGICOFFSET, DOSMAGIC);
85 STAILQ_FOREACH_SAFE(part, &partlist, link, next) {
86 block = part->block - nsecs;
87 dp = (void *)(ebr + DOSPARTOFF);
88 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, nsecs);
89 dp->dp_typ = ALIAS_TYPE2INT(part->type);
90 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect,
91 part->block + part->size - 1);
92 le32enc(&dp->dp_start, nsecs);
93 le32enc(&dp->dp_size, part->size);
98 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect,
100 dp->dp_typ = DOSPTYP_EXT;
101 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect,
102 next->block + next->size - 1);
103 le32enc(&dp->dp_start, next->block - nsecs);
104 le32enc(&dp->dp_size, next->size + nsecs);
107 error = image_write(block, ebr, 1);
111 memset(ebr + DOSPARTOFF, 0, 2 * DOSPARTSIZE);
118 static struct mkimg_scheme ebr_scheme = {
120 .description = "Extended Boot Record",
121 .aliases = ebr_aliases,
122 .metadata = ebr_metadata,
128 SCHEME_DEFINE(ebr_scheme);