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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>
- #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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