5aad7d9a87
Not only is the header unportable, the encoding/decoding functions are as well. Instead, duplicate the handful of small inlines we need into a private header called endian.h. Aside: an alternative approach is to move the encoding/decoding functions to a separate system header. While the header is still nonportable, such an approach would make it possible to re-use the definitions by playing games with include paths. This may be the preferred approach if more (build) utilities need this. This change does not preclude that. In fact, it makes it easier.
133 lines
3.8 KiB
C
133 lines
3.8 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/types.h>
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#include <sys/diskmbr.h>
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#include <sys/errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.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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#ifndef DOSPTYP_FAT16B
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#define DOSPTYP_FAT16B 0x06
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#endif
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#ifndef DOSPTYP_FAT32
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#define DOSPTYP_FAT32 0x0b
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#endif
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#ifndef DOSPTYP_PPCBOOT
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#define DOSPTYP_PPCBOOT 0x41
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#endif
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#ifndef DOSPTYP_EFI
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#define DOSPTYP_EFI 0xef
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#endif
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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_FAT16B) },
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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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STAILQ_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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dp->dp_flag = (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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