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/*-
* Copyright (c) 2014 Juniper Networks, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <mbr.h>
#include "endian.h"
#include "image.h"
#include "mkimg.h"
#include "scheme.h"
static struct mkimg_alias mbr_aliases[] = {
{ ALIAS_EBR, ALIAS_INT2TYPE(DOSPTYP_EXT) },
{ ALIAS_EFI, ALIAS_INT2TYPE(DOSPTYP_EFI) },
{ ALIAS_FAT16B, ALIAS_INT2TYPE(DOSPTYP_FAT16) },
{ ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) },
{ ALIAS_FAT32LBA, ALIAS_INT2TYPE(DOSPTYP_FAT32LBA) },
{ ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) },
{ ALIAS_NTFS, ALIAS_INT2TYPE(DOSPTYP_NTFS) },
{ ALIAS_PPCBOOT, ALIAS_INT2TYPE(DOSPTYP_PPCBOOT) },
{ ALIAS_NONE, 0 } /* Keep last! */
};
static lba_t
mbr_metadata(u_int where, lba_t blk)
{
blk += (where == SCHEME_META_IMG_START) ? 1 : 0;
return (round_track(blk));
}
static void
mbr_chs(u_char *cylp, u_char *hdp, u_char *secp, lba_t lba)
{
u_int cyl, hd, sec;
mkimg_chs(lba, 1023, &cyl, &hd, &sec);
*cylp = cyl;
*hdp = hd;
*secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0);
}
static int
mbr_write(lba_t imgsz __unused, void *bootcode)
{
u_char *mbr;
struct dos_partition *dpbase, *dp;
struct part *part;
lba_t size;
int error;
mbr = malloc(secsz);
if (mbr == NULL)
return (ENOMEM);
if (bootcode != NULL) {
memcpy(mbr, bootcode, DOSPARTOFF);
memset(mbr + DOSPARTOFF, 0, secsz - DOSPARTOFF);
} else
memset(mbr, 0, secsz);
le16enc(mbr + DOSMAGICOFFSET, DOSMAGIC);
dpbase = (void *)(mbr + DOSPARTOFF);
TAILQ_FOREACH(part, &partlist, link) {
size = round_track(part->size);
dp = dpbase + part->index;
if (active_partition != 0)
dp->dp_flag =
(part->index + 1 == active_partition) ? 0x80 : 0;
else
dp->dp_flag =
(part->index == 0 && bootcode != NULL) ? 0x80 : 0;
mbr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect,
part->block);
dp->dp_typ = ALIAS_TYPE2INT(part->type);
mbr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect,
part->block + size - 1);
le32enc(&dp->dp_start, part->block);
le32enc(&dp->dp_size, size);
}
error = image_write(0, mbr, 1);
free(mbr);
return (error);
}
static struct mkimg_scheme mbr_scheme = {
.name = "mbr",
.description = "Master Boot Record",
.aliases = mbr_aliases,
.metadata = mbr_metadata,
.write = mbr_write,
.bootcode = 512,
.nparts = NDOSPART,
.maxsecsz = 4096
};
SCHEME_DEFINE(mbr_scheme);
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