1 /*- 2 * Copyright (c) 2014 Juniper Networks, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/types.h> 31 #include <sys/diskmbr.h> 32 #include <sys/endian.h> 33 #include <sys/errno.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <unistd.h> 37 38 #include "image.h" 39 #include "mkimg.h" 40 #include "scheme.h" 41 42 #ifndef DOSPTYP_FAT32 43 #define DOSPTYP_FAT32 0x0b 44 #endif 45 46 static struct mkimg_alias mbr_aliases[] = { 47 { ALIAS_EBR, ALIAS_INT2TYPE(DOSPTYP_EXT) }, 48 { ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) }, 49 { ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) }, 50 { ALIAS_NONE, 0 } /* Keep last! */ 51 }; 52 53 static lba_t 54 mbr_metadata(u_int where, lba_t blk) 55 { 56 57 blk += (where == SCHEME_META_IMG_START) ? 1 : 0; 58 return (round_track(blk)); 59 } 60 61 static void 62 mbr_chs(u_char *cyl, u_char *hd, u_char *sec, uint32_t lba __unused) 63 { 64 65 *cyl = 0xff; /* XXX */ 66 *hd = 0xff; /* XXX */ 67 *sec = 0xff; /* XXX */ 68 } 69 70 static int 71 mbr_write(lba_t imgsz __unused, void *bootcode) 72 { 73 u_char *mbr; 74 struct dos_partition *dpbase, *dp; 75 struct part *part; 76 int error; 77 78 mbr = malloc(secsz); 79 if (mbr == NULL) 80 return (ENOMEM); 81 if (bootcode != NULL) { 82 memcpy(mbr, bootcode, DOSPARTOFF); 83 memset(mbr + DOSPARTOFF, 0, secsz - DOSPARTOFF); 84 } else 85 memset(mbr, 0, secsz); 86 le16enc(mbr + DOSMAGICOFFSET, DOSMAGIC); 87 dpbase = (void *)(mbr + DOSPARTOFF); 88 STAILQ_FOREACH(part, &partlist, link) { 89 dp = dpbase + part->index; 90 dp->dp_flag = (part->index == 0 && bootcode != NULL) ? 0x80 : 0; 91 mbr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, 92 part->block); 93 dp->dp_typ = ALIAS_TYPE2INT(part->type); 94 mbr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect, 95 part->block + part->size - 1); 96 le32enc(&dp->dp_start, part->block); 97 le32enc(&dp->dp_size, part->size); 98 } 99 error = image_write(0, mbr, 1); 100 free(mbr); 101 return (error); 102 } 103 104 static struct mkimg_scheme mbr_scheme = { 105 .name = "mbr", 106 .description = "Master Boot Record", 107 .aliases = mbr_aliases, 108 .metadata = mbr_metadata, 109 .write = mbr_write, 110 .bootcode = 512, 111 .nparts = NDOSPART, 112 .maxsecsz = 4096 113 }; 114 115 SCHEME_DEFINE(mbr_scheme); 116