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 "mkimg.h" 39 #include "scheme.h" 40 41 #ifndef DOSPTYP_FAT32 42 #define DOSPTYP_FAT32 0x0b 43 #endif 44 45 static struct mkimg_alias ebr_aliases[] = { 46 { ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) }, 47 { ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) }, 48 { ALIAS_NONE, 0 } 49 }; 50 51 static u_int 52 ebr_metadata(u_int where) 53 { 54 u_int secs; 55 56 secs = (where == SCHEME_META_PART_BEFORE) ? nsecs : 0; 57 return (secs); 58 } 59 60 static void 61 ebr_chs(u_char *cyl, u_char *hd, u_char *sec, uint32_t lba __unused) 62 { 63 64 *cyl = 0xff; /* XXX */ 65 *hd = 0xff; /* XXX */ 66 *sec = 0xff; /* XXX */ 67 } 68 69 static int 70 ebr_write(int fd, lba_t imgsz __unused, void *bootcode __unused) 71 { 72 u_char *ebr; 73 struct dos_partition *dp; 74 struct part *part, *next; 75 lba_t block; 76 int error; 77 78 ebr = malloc(secsz); 79 if (ebr == NULL) 80 return (ENOMEM); 81 memset(ebr, 0, secsz); 82 le16enc(ebr + DOSMAGICOFFSET, DOSMAGIC); 83 84 error = 0; 85 STAILQ_FOREACH_SAFE(part, &partlist, link, next) { 86 block = part->block - nsecs; 87 dp = (void *)(ebr + DOSPARTOFF); 88 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, nsecs); 89 dp->dp_typ = ALIAS_TYPE2INT(part->type); 90 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect, 91 part->block + part->size - 1); 92 le32enc(&dp->dp_start, nsecs); 93 le32enc(&dp->dp_size, part->size); 94 95 /* Add link entry */ 96 if (next != NULL) { 97 dp++; 98 ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, 99 next->block - nsecs); 100 dp->dp_typ = DOSPTYP_EXT; 101 ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect, 102 next->block + next->size - 1); 103 le32enc(&dp->dp_start, next->block - nsecs); 104 le32enc(&dp->dp_size, next->size + nsecs); 105 } 106 107 error = mkimg_write(fd, block, ebr, 1); 108 if (error) 109 break; 110 111 memset(ebr + DOSPARTOFF, 0, 2 * DOSPARTSIZE); 112 } 113 114 free(ebr); 115 return (error); 116 } 117 118 static struct mkimg_scheme ebr_scheme = { 119 .name = "ebr", 120 .description = "Extended Boot Record", 121 .aliases = ebr_aliases, 122 .metadata = ebr_metadata, 123 .write = ebr_write, 124 .nparts = 4096, 125 .maxsecsz = 4096 126 }; 127 128 SCHEME_DEFINE(ebr_scheme); 129