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>
42 #ifndef DOSPTYP_FAT16B
43 #define DOSPTYP_FAT16B 0x06
46 #define DOSPTYP_FAT32 0x0b
49 static struct mkimg_alias ebr_aliases[] = {
50 { ALIAS_FAT16B, ALIAS_INT2TYPE(DOSPTYP_FAT16B) },
51 { ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) },
52 { ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) },
57 ebr_metadata(u_int where, lba_t blk)
60 blk += (where == SCHEME_META_PART_BEFORE) ? 1 : 0;
61 return (round_track(blk));
65 ebr_chs(u_char *cylp, u_char *hdp, u_char *secp, lba_t lba)
69 mkimg_chs(lba, 1023, &cyl, &hd, &sec);
72 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0);
76 ebr_write(lba_t imgsz __unused, void *bootcode __unused)
79 struct dos_partition *dp;
80 struct part *part, *next;
87 memset(ebr, 0, secsz);
88 le16enc(ebr + DOSMAGICOFFSET, DOSMAGIC);
91 STAILQ_FOREACH_SAFE(part, &partlist, link, next) {
92 block = part->block - nsecs;
93 size = round_track(part->size);
94 dp = (void *)(ebr + DOSPARTOFF);
95 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, nsecs);
96 dp->dp_typ = ALIAS_TYPE2INT(part->type);
97 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect,
98 part->block + size - 1);
99 le32enc(&dp->dp_start, nsecs);
100 le32enc(&dp->dp_size, size);
104 size = round_track(next->size);
106 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect,
107 next->block - nsecs);
108 dp->dp_typ = DOSPTYP_EXT;
109 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect,
110 next->block + size - 1);
111 le32enc(&dp->dp_start, next->block - nsecs);
112 le32enc(&dp->dp_size, size + nsecs);
115 error = image_write(block, ebr, 1);
119 memset(ebr + DOSPARTOFF, 0, 2 * DOSPARTSIZE);
126 static struct mkimg_scheme ebr_scheme = {
128 .description = "Extended Boot Record",
129 .aliases = ebr_aliases,
130 .metadata = ebr_metadata,
136 SCHEME_DEFINE(ebr_scheme);