mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/*-
|
|
* 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/types.h>
|
|
#include <sys/diskmbr.h>
|
|
#include <sys/endian.h>
|
|
#include <sys/errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include "image.h"
|
|
#include "mkimg.h"
|
|
#include "scheme.h"
|
|
|
|
#ifndef DOSPTYP_FAT32
|
|
#define DOSPTYP_FAT32 0x0b
|
|
#endif
|
|
#ifndef DOSPTYP_EFI
|
|
#define DOSPTYP_EFI 0xef
|
|
#endif
|
|
|
|
static struct mkimg_alias mbr_aliases[] = {
|
|
{ ALIAS_EBR, ALIAS_INT2TYPE(DOSPTYP_EXT) },
|
|
{ ALIAS_EFI, ALIAS_INT2TYPE(DOSPTYP_EFI) },
|
|
{ ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) },
|
|
{ ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) },
|
|
{ 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);
|
|
STAILQ_FOREACH(part, &partlist, link) {
|
|
size = round_track(part->size);
|
|
dp = dpbase + part->index;
|
|
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);
|