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 <stdint.h>
  30 #include <ctype.h>
  31 #include <fcntl.h>
  32 #include <stdint.h>
  33
  34 #if __BYTE_ORDER == __BIG_ENDIAN
  35 #define cpu_to_le32(x) bswap_32(x)
  36 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  37 #define cpu_to_le32(x) (x)
  38 #else
  39 #error unknown endianness!
  40 #endif
  41
  42 /* Partition table entry */
  43 struct pte {
  44         uint8_t active;
  45         uint8_t chs_start[3];
  46         uint8_t type;
  47         uint8_t chs_end[3];
  48         uint32_t start;
  49         uint32_t length;
  50 };
  51
  52 struct partinfo {
  53         unsigned long size;
  54         int type;
  55 };
  56
  57 int verbose = 0;
  58 int active = 1;
  59 int heads = -1;
  60 int sectors = -1;
  61 int kb_align = 0;
  62 struct partinfo parts[4];
  63 char *filename = NULL;
  64
  65
  66 /*
  67  * parse the size argument, which is either
  68  * a simple number (K assumed) or
  69  * K, M or G
  70  *
  71  * returns the size in KByte
  72  */
  73 static long to_kbytes(const char *string) {
  74         int exp = 0;
  75         long result;
  76         char *end;
  77
  78         result = strtoul(string, &end, 0);
  79         switch (tolower(*end)) {
  80                         case 'k' :
  81                         case '\0' : exp = 0; break;
  82                         case 'm' : exp = 1; break;
  83                         case 'g' : exp = 2; break;
  84                         default: return 0;
  85         }
  86
  87         if (*end)
  88                 end++;
  89
  90         if (*end) {
  91                 fprintf(stderr, "garbage after end of number\n");
  92                 return 0;
  93         }
  94
  95         /* result: number + 1024^(exp) */
  96         return result * ((2 << ((10 * exp) - 1)) ?: 1);
  97 }
  98
  99 /* convert the sector number into a CHS value for the partition table */
 100 static void to_chs(long sect, unsigned char chs[3]) {
 101         int c,h,s;
 102
 103         s = (sect % sectors) + 1;
 104         sect = sect / sectors;
 105         h = sect % heads;
 106         sect = sect / heads;
 107         c = sect;
 108
 109         chs[0] = h;
 110         chs[1] = s | ((c >> 2) & 0xC0);
 111         chs[2] = c & 0xFF;
 112
 113         return;
 114 }
 115
 116 /* round the sector number up to the next cylinder */
 117 static inline unsigned long round_to_cyl(long sect) {
 118         int cyl_size = heads * sectors;
 119
 120         return sect + cyl_size - (sect % cyl_size);
 121 }
 122
 123 /* round the sector number up to the kb_align boundary */
 124 static inline unsigned long round_to_kb(long sect) {
 125         return ((sect - 1) / kb_align + 1) * kb_align;
 126 }
 127
 128 /* check the partition sizes and write the partition table */
 129 static int gen_ptable(uint32_t signature, int nr)
 130 {
 131         struct pte pte[4];
 132         unsigned long sect = 0;
 133         int i, fd, ret = -1, start, len;
 134
 135         memset(pte, 0, sizeof(struct pte) * 4);
 136         for (i = 0; i < nr; i++) {
 137                 if (!parts[i].size) {
 138                         fprintf(stderr, "Invalid size in partition %d!\n", i);
 139                         return -1;
 140                 }
 141                 pte[i].active = ((i + 1) == active) ? 0x80 : 0;
 142                 pte[i].type = parts[i].type;
 143                 start = sect + sectors;
 144                 if (kb_align != 0)
 145                         start = round_to_kb(start);
 146                 pte[i].start = cpu_to_le32(start);
 147                 sect = start + parts[i].size * 2;
 148                 if (kb_align == 0)
 149                         sect = round_to_cyl(sect);
 150                 pte[i].length = cpu_to_le32(len = sect - start);
 151                 to_chs(start, pte[i].chs_start);
 152                 to_chs(start + len - 1, pte[i].chs_end);
 153                 if (verbose)
 154                         fprintf(stderr, "Partition %d: start=%ld, end=%ld, size=%ld\n", i, (long) start * 512, ((long) start + (long) len) * 512, (long) len * 512);
 155                 printf("%ld\n", ((long) start * 512));
 156                 printf("%ld\n", ((long) len * 512));
 157         }
 158
 159         if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
 160                 fprintf(stderr, "Can't open output file '%s'\n",filename);
 161                 return -1;
 162         }
 163
 164         lseek(fd, 440, SEEK_SET);
 165         if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
 166                 fprintf(stderr, "write failed.\n");
 167                 goto fail;
 168         }
 169
 170         lseek(fd, 446, SEEK_SET);
 171         if (write(fd, pte, sizeof(struct pte) * 4) != sizeof(struct pte) * 4) {
 172                 fprintf(stderr, "write failed.\n");
 173                 goto fail;
 174         }
 175         lseek(fd, 510, SEEK_SET);
 176         if (write(fd, "\x55\xaa", 2) != 2) {
 177                 fprintf(stderr, "write failed.\n");
 178                 goto fail;
 179         }
 180
 181         ret = 0;
 182 fail:
 183         close(fd);
 184         return ret;
 185 }
 186
 187 static void usage(char *prog)
 188 {
 189         fprintf(stderr, "Usage: %s [-v] -h <heads> -s <sectors> -o <outputfile> [-a 0..4] [-l <align kB>] [[-t <type>] -p <size>...] \n", prog);
 190         exit(1);
 191 }
 192
 193 int main (int argc, char **argv)
 194 {
 195         char type = 0x83;
 196         int ch;
 197         int part = 0;
 198         uint32_t signature = 0x5452574F; /* 'OWRT' */
 199
 200         while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vl:S:")) != -1) {
 201                 switch (ch) {
 202                 case 'o':
 203                         filename = optarg;
 204                         break;
 205                 case 'v':
 206                         verbose++;
 207                         break;
 208                 case 'h':
 209                         heads = (int) strtoul(optarg, NULL, 0);
 210                         break;
 211                 case 's':
 212                         sectors = (int) strtoul(optarg, NULL, 0);
 213                         break;
 214                 case 'p':
 215                         if (part > 3) {
 216                                 fprintf(stderr, "Too many partitions\n");
 217                                 exit(1);
 218                         }
 219                         parts[part].size = to_kbytes(optarg);
 220                         parts[part++].type = type;
 221                         break;
 222                 case 't':
 223                         type = (char) strtoul(optarg, NULL, 16);
 224                         break;
 225                 case 'a':
 226                         active = (int) strtoul(optarg, NULL, 0);
 227                         if ((active < 0) || (active > 4))
 228                                 active = 0;
 229                         break;
 230                 case 'l':
 231                         kb_align = (int) strtoul(optarg, NULL, 0) * 2;
 232                         break;
 233                 case 'S':
 234                         signature = strtoul(optarg, NULL, 0);
 235                         break;
 236                 case '?':
 237                 default:
 238                         usage(argv[0]);
 239                 }
 240         }
 241         argc -= optind;
 242         if (argc || (heads <= 0) || (sectors <= 0) || !filename)
 243                 usage(argv[0]);
 244
 245         return gen_ptable(signature, part);
 246 }