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