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/errno.h> 31 #include <stdint.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <unistd.h> 35 36 #include <sys/diskmbr.h> 37 38 #include "endian.h" 39 #include "image.h" 40 #include "mkimg.h" 41 #include "scheme.h" 42 43 #ifndef DOSPTYP_FAT16B 44 #define DOSPTYP_FAT16B 0x06 45 #endif 46 #ifndef DOSPTYP_FAT32 47 #define DOSPTYP_FAT32 0x0b 48 #endif 49 50 static struct mkimg_alias ebr_aliases[] = { 51 { ALIAS_FAT16B, ALIAS_INT2TYPE(DOSPTYP_FAT16B) }, 52 { ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) }, 53 { ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) }, 54 { ALIAS_NONE, 0 } 55 }; 56 57 static lba_t 58 ebr_metadata(u_int where, lba_t blk) 59 { 60 61 blk += (where == SCHEME_META_PART_BEFORE) ? 1 : 0; 62 return (round_track(blk)); 63 } 64 65 static void 66 ebr_chs(u_char *cylp, u_char *hdp, u_char *secp, lba_t lba) 67 { 68 u_int cyl, hd, sec; 69 70 mkimg_chs(lba, 1023, &cyl, &hd, &sec); 71 *cylp = cyl; 72 *hdp = hd; 73 *secp = (sec & 0x3f) | ((cyl >> 2) & 0xc0); 74 } 75 76 static int 77 ebr_write(lba_t imgsz __unused, void *bootcode __unused) 78 { 79 u_char *ebr; 80 struct dos_partition *dp; 81 struct part *part, *next; 82 lba_t block, size; 83 int error; 84 85 ebr = malloc(secsz); 86 if (ebr == NULL) 87 return (ENOMEM); 88 memset(ebr, 0, secsz); 89 le16enc(ebr + DOSMAGICOFFSET, DOSMAGIC); 90 91 error = 0; 92 TAILQ_FOREACH(part, &partlist, link) { 93 block = part->block - nsecs; 94 size = round_track(part->size); 95 dp = (void *)(ebr + DOSPARTOFF); 96 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, nsecs); 97 dp->dp_typ = ALIAS_TYPE2INT(part->type); 98 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect, 99 part->block + size - 1); 100 le32enc(&dp->dp_start, nsecs); 101 le32enc(&dp->dp_size, size); 102 103 /* Add link entry */ 104 next = TAILQ_NEXT(part, link); 105 if (next != NULL) { 106 size = round_track(next->size); 107 dp++; 108 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, 109 next->block - nsecs); 110 dp->dp_typ = DOSPTYP_EXT; 111 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect, 112 next->block + size - 1); 113 le32enc(&dp->dp_start, next->block - nsecs); 114 le32enc(&dp->dp_size, size + nsecs); 115 } 116 117 error = image_write(block, ebr, 1); 118 if (error) 119 break; 120 121 memset(ebr + DOSPARTOFF, 0, 2 * DOSPARTSIZE); 122 } 123 124 free(ebr); 125 return (error); 126 } 127 128 static struct mkimg_scheme ebr_scheme = { 129 .name = "ebr", 130 .description = "Extended Boot Record", 131 .aliases = ebr_aliases, 132 .metadata = ebr_metadata, 133 .write = ebr_write, 134 .nparts = 4096, 135 .maxsecsz = 4096 136 }; 137 138 SCHEME_DEFINE(ebr_scheme); 139