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 ebr_aliases[] = { 47 { ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) }, 48 { ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) }, 49 { ALIAS_NONE, 0 } 50 }; 51 52 static u_int 53 ebr_metadata(u_int where) 54 { 55 u_int secs; 56 57 secs = (where == SCHEME_META_PART_BEFORE) ? nsecs : 0; 58 return (secs); 59 } 60 61 static void 62 ebr_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 ebr_write(lba_t imgsz __unused, void *bootcode __unused) 72 { 73 u_char *ebr; 74 struct dos_partition *dp; 75 struct part *part, *next; 76 lba_t block; 77 int error; 78 79 ebr = malloc(secsz); 80 if (ebr == NULL) 81 return (ENOMEM); 82 memset(ebr, 0, secsz); 83 le16enc(ebr + DOSMAGICOFFSET, DOSMAGIC); 84 85 error = 0; 86 STAILQ_FOREACH_SAFE(part, &partlist, link, next) { 87 block = part->block - nsecs; 88 dp = (void *)(ebr + DOSPARTOFF); 89 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, nsecs); 90 dp->dp_typ = ALIAS_TYPE2INT(part->type); 91 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect, 92 part->block + part->size - 1); 93 le32enc(&dp->dp_start, nsecs); 94 le32enc(&dp->dp_size, part->size); 95 96 /* Add link entry */ 97 if (next != NULL) { 98 dp++; 99 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, 100 next->block - nsecs); 101 dp->dp_typ = DOSPTYP_EXT; 102 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect, 103 next->block + next->size - 1); 104 le32enc(&dp->dp_start, next->block - nsecs); 105 le32enc(&dp->dp_size, next->size + nsecs); 106 } 107 108 error = image_write(block, ebr, 1); 109 if (error) 110 break; 111 112 memset(ebr + DOSPARTOFF, 0, 2 * DOSPARTSIZE); 113 } 114 115 free(ebr); 116 return (error); 117 } 118 119 static struct mkimg_scheme ebr_scheme = { 120 .name = "ebr", 121 .description = "Extended Boot Record", 122 .aliases = ebr_aliases, 123 .metadata = ebr_metadata, 124 .write = ebr_write, 125 .nparts = 4096, 126 .maxsecsz = 4096 127 }; 128 129 SCHEME_DEFINE(ebr_scheme); 130