tools/firmware-utils/src/ptgen.c

   1 /*
   2  * ptgen - partition table generator
   3  * Copyright (C) 2006 by Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * uses parts of afdisk
   6  * Copyright (C) 2002 by David Roetzel <david@roetzel.de>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21  */
  22
  23 #include <sys/types.h>
  24 #include <sys/stat.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <stdlib.h>
  28 #include <stdio.h>
  29 #include <ctype.h>
  30 #include <fcntl.h>
  31 #include <stdint.h>
  32
  33 #if __BYTE_ORDER == __BIG_ENDIAN
  34 #define cpu_to_le16(x) bswap_16(x)
  35 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  36 #define cpu_to_le16(x) (x)
  37 #else
  38 #error unknown endianness!
  39 #endif
  40
  41 /* Partition table entry */
  42 struct pte {
  43         unsigned char active;
  44         unsigned char chs_start[3];
  45         unsigned char type;
  46         unsigned char chs_end[3];
  47         unsigned int start;
  48         unsigned int length;
  49 };
  50
  51 struct partinfo {
  52         unsigned long size;
  53         int type;
  54 };
  55
  56 int verbose = 0;
  57 int active = 1;
  58 int heads = -1;
  59 int sectors = -1;
  60 int kb_align = 0;
  61 struct partinfo parts[4];
  62 char *filename = NULL;
  63
  64
  65 /*
  66  * parse the size argument, which is either
  67  * a simple number (K assumed) or
  68  * K, M or G
  69  *
  70  * returns the size in KByte
  71  */
  72 static long to_kbytes(const char *string) {
  73         int exp = 0;
  74         long result;
  75         char *end;
  76
  77         result = strtoul(string, &end, 0);
  78         switch (tolower(*end)) {
  79                         case 'k' :
  80                         case '\0' : exp = 0; break;
  81                         case 'm' : exp = 1; break;
  82                         case 'g' : exp = 2; break;
  83                         default: return 0;
  84         }
  85
  86         if (*end)
  87                 end++;
  88
  89         if (*end) {
  90                 fprintf(stderr, "garbage after end of number\n");
  91                 return 0;
  92         }
  93
  94         /* result: number + 1024^(exp) */
  95         return result * ((2 << ((10 * exp) - 1)) ?: 1);
  96 }
  97
  98 /* convert the sector number into a CHS value for the partition table */
  99 static void to_chs(long sect, unsigned char chs[3]) {
 100         int c,h,s;
 101
 102         s = (sect % sectors) + 1;
 103         sect = sect / sectors;
 104         h = sect % heads;
 105         sect = sect / heads;
 106         c = sect;
 107
 108         chs[0] = h;
 109         chs[1] = s | ((c >> 2) & 0xC0);
 110         chs[2] = c & 0xFF;
 111
 112         return;
 113 }
 114
 115 /* round the sector number up to the next cylinder */
 116 static inline unsigned long round_to_cyl(long sect) {
 117         int cyl_size = heads * sectors;
 118
 119         return sect + cyl_size - (sect % cyl_size);
 120 }
 121
 122 /* round the sector number up to the kb_align boundary */
 123 static inline unsigned long round_to_kb(long sect) {
 124         return ((sect - 1) / kb_align + 1) * kb_align;
 125 }
 126
 127 /* check the partition sizes and write the partition table */
 128 static int gen_ptable(uint32_t signature, int nr)
 129 {
 130         struct pte pte[4];
 131         unsigned long sect = 0;
 132         int i, fd, ret = -1, start, len;
 133
 134         memset(pte, 0, sizeof(struct pte) * 4);
 135         for (i = 0; i < nr; i++) {
 136                 if (!parts[i].size) {
 137                         fprintf(stderr, "Invalid size in partition %d!\n", i);
 138                         return -1;
 139                 }
 140                 pte[i].active = ((i + 1) == active) ? 0x80 : 0;
 141                 pte[i].type = parts[i].type;
 142                 start = sect + sectors;
 143                 if (kb_align != 0)
 144                         start = round_to_kb(start);
 145                 pte[i].start = cpu_to_le16(start);
 146                 sect = start + parts[i].size * 2;
 147                 if (kb_align == 0)
 148                         sect = round_to_cyl(sect);
 149                 pte[i].length = cpu_to_le16(len = sect - start);
 150                 to_chs(start, pte[i].chs_start);
 151                 to_chs(start + len - 1, pte[i].chs_end);
 152                 if (verbose)
 153                         fprintf(stderr, "Partition %d: start=%ld, end=%ld, size=%ld\n", i, (long) start * 512, ((long) start + (long) len) * 512, (long) len * 512);
 154                 printf("%ld\n", ((long) start * 512));
 155                 printf("%ld\n", ((long) len * 512));
 156         }
 157
 158         if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
 159                 fprintf(stderr, "Can't open output file '%s'\n",filename);
 160                 return -1;
 161         }
 162
 163         lseek(fd, 440, SEEK_SET);
 164         if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
 165                 fprintf(stderr, "write failed.\n");
 166                 goto fail;
 167         }
 168
 169         lseek(fd, 446, SEEK_SET);
 170         if (write(fd, pte, sizeof(struct pte) * 4) != sizeof(struct pte) * 4) {
 171                 fprintf(stderr, "write failed.\n");
 172                 goto fail;
 173         }
 174         lseek(fd, 510, SEEK_SET);
 175         if (write(fd, "\x55\xaa", 2) != 2) {
 176                 fprintf(stderr, "write failed.\n");
 177                 goto fail;
 178         }
 179
 180         ret = 0;
 181 fail:
 182         close(fd);
 183         return ret;
 184 }
 185
 186 static void usage(char *prog)
 187 {
 188         fprintf(stderr, "Usage: %s [-v] -h <heads> -s <sectors> -o <outputfile> [-a 0..4] [-l <align kB>] [[-t <type>] -p <size>...] \n", prog);
 189         exit(1);
 190 }
 191
 192 int main (int argc, char **argv)
 193 {
 194         char type = 0x83;
 195         int ch;
 196         int part = 0;
 197         uint32_t signature = 0x5452574F; /* 'OWRT' */
 198
 199         while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vl:S:")) != -1) {
 200                 switch (ch) {
 201                 case 'o':
 202                         filename = optarg;
 203                         break;
 204                 case 'v':
 205                         verbose++;
 206                         break;
 207                 case 'h':
 208                         heads = (int) strtoul(optarg, NULL, 0);
 209                         break;
 210                 case 's':
 211                         sectors = (int) strtoul(optarg, NULL, 0);
 212                         break;
 213                 case 'p':
 214                         if (part > 3) {
 215                                 fprintf(stderr, "Too many partitions\n");
 216                                 exit(1);
 217                         }
 218                         parts[part].size = to_kbytes(optarg);
 219                         parts[part++].type = type;
 220                         break;
 221                 case 't':
 222                         type = (char) strtoul(optarg, NULL, 16);
 223                         break;
 224                 case 'a':
 225                         active = (int) strtoul(optarg, NULL, 0);
 226                         if ((active < 0) || (active > 4))
 227                                 active = 0;
 228                         break;
 229                 case 'l':
 230                         kb_align = (int) strtoul(optarg, NULL, 0) * 2;
 231                         break;
 232                 case 'S':
 233                         signature = strtoul(optarg, NULL, 0);
 234                         break;
 235                 case '?':
 236                 default:
 237                         usage(argv[0]);
 238                 }
 239         }
 240         argc -= optind;
 241         if (argc || (heads <= 0) || (sectors <= 0) || !filename)
 242                 usage(argv[0]);
 243
 244         return gen_ptable(signature, part);
 245 }