ebr.c revision 263843
180709Sjake/*- 280709Sjake * Copyright (c) 2014 Juniper Networks, Inc. 380709Sjake * All rights reserved. 480709Sjake * 580709Sjake * Redistribution and use in source and binary forms, with or without 680709Sjake * modification, are permitted provided that the following conditions 780709Sjake * are met: 880709Sjake * 1. Redistributions of source code must retain the above copyright 980709Sjake * notice, this list of conditions and the following disclaimer. 1080709Sjake * 2. Redistributions in binary form must reproduce the above copyright 1180709Sjake * notice, this list of conditions and the following disclaimer in the 1280709Sjake * documentation and/or other materials provided with the distribution. 1380709Sjake * 1481334Sobrien * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1580709Sjake * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1680709Sjake * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1781334Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1880709Sjake * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 1980709Sjake * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2080709Sjake * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2180709Sjake * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2280709Sjake * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2380709Sjake * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2480709Sjake * SUCH DAMAGE. 2580709Sjake */ 2680709Sjake 2780709Sjake#include <sys/cdefs.h> 2880709Sjake__FBSDID("$FreeBSD: user/marcel/mkimg/ebr.c 263843 2014-03-27 22:39:22Z marcel $"); 2980709Sjake 3080709Sjake#include <sys/types.h> 3180709Sjake#include <sys/diskmbr.h> 3284179Sjake#include <sys/endian.h> 3384179Sjake#include <sys/errno.h> 3488630Sjake#include <stdlib.h> 3588630Sjake#include <string.h> 3688630Sjake#include <unistd.h> 3788630Sjake 3888630Sjake#include "mkimg.h" 3988630Sjake#include "scheme.h" 4088630Sjake 4188630Sjakestatic struct mkimg_alias ebr_aliases[] = { 4288630Sjake { ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) }, 4388630Sjake { ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) }, 44154419Skris { ALIAS_NONE, 0 } 4588630Sjake}; 4688630Sjake 4788630Sjakestatic u_int 4888630Sjakeebr_metadata(u_int where) 4988630Sjake{ 5088630Sjake u_int secs; 5188630Sjake 5288630Sjake secs = (where == SCHEME_META_PART_BEFORE) ? 1 : 0; 5388630Sjake return (secs); 5488630Sjake} 5588630Sjake 5688630Sjakestatic void 5788630Sjakeebr_chs(u_char *cyl, u_char *hd, u_char *sec, uint32_t lba __unused) 5888630Sjake{ 5988630Sjake 6088630Sjake *cyl = 0xff; /* XXX */ 6188630Sjake *hd = 0xff; /* XXX */ 6288630Sjake *sec = 0xff; /* XXX */ 6388630Sjake} 6488630Sjake 6588630Sjakestatic int 6688630Sjakeebr_write(int fd, lba_t imgsz __unused, void *bootcode __unused) 6788630Sjake{ 68114257Sjake u_char *ebr; 69114257Sjake struct dos_partition *dp; 7080709Sjake struct part *part, *next; 71114257Sjake lba_t block; 72114257Sjake int error; 73114257Sjake 74114257Sjake ebr = malloc(secsz); 7588630Sjake if (ebr == NULL) 7688630Sjake return (ENOMEM); 7788630Sjake memset(ebr, 0, secsz); 7888630Sjake le16enc(ebr + DOSMAGICOFFSET, DOSMAGIC); 7988630Sjake 8088630Sjake error = 0; 8188630Sjake STAILQ_FOREACH_SAFE(part, &partlist, link, next) { 8288630Sjake block = part->block - nsecs; 8388630Sjake dp = (void *)(ebr + DOSPARTOFF); 8488630Sjake ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, nsecs); 8588630Sjake dp->dp_typ = ALIAS_TYPE2INT(part->type); 8688781Sjake ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect, 8788630Sjake part->block + part->size - 1); 88105939Sjake le32enc(&dp->dp_start, nsecs); 89105939Sjake le32enc(&dp->dp_size, part->size); 9088630Sjake 9188630Sjake /* Add link entry */ 9280709Sjake if (next != NULL) { 93182773Smarius dp++; 94190107Smarius ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, 9580709Sjake next->block - nsecs); 9680709Sjake dp->dp_typ = DOSPTYP_EXT; 9784179Sjake ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect, 9884179Sjake next->block + next->size - 1); 9980709Sjake le32enc(&dp->dp_start, next->block - nsecs); 100 le32enc(&dp->dp_size, next->size + nsecs); 101 } 102 103 error = mkimg_seek(fd, block); 104 if (error == 0) { 105 if (write(fd, ebr, secsz) != secsz) 106 error = errno; 107 } 108 if (error) 109 break; 110 111 memset(ebr + DOSPARTOFF, 0, 2 * DOSPARTSIZE); 112 } 113 114 free(ebr); 115 return (error); 116} 117 118static 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 128SCHEME_DEFINE(ebr_scheme); 129