2 * ptgen - partition table generator
3 * Copyright (C) 2006 by Felix Fietkau <nbd@openwrt.org>
6 * Copyright (C) 2002 by David Roetzel <david@roetzel.de>
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.
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.
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
23 #include <sys/types.h>
32 #if __BYTE_ORDER == __BIG_ENDIAN
33 #define cpu_to_le16(x) bswap_16(x)
34 #elif __BYTE_ORDER == __LITTLE_ENDIAN
35 #define cpu_to_le16(x) (x)
37 #error unknown endianness!
40 /* Partition table entry */
43 unsigned char chs_start[3];
45 unsigned char chs_end[3];
59 struct partinfo parts[4];
60 char *filename = NULL;
64 * parse the size argument, which is either
65 * a simple number (K assumed) or
68 * returns the size in KByte
70 static long to_kbytes(const char *string) {
75 result = strtoul(string, &end, 0);
76 switch (tolower(*end)) {
78 case '\0' : exp = 0; break;
79 case 'm' : exp = 1; break;
80 case 'g' : exp = 2; break;
88 fprintf(stderr, "garbage after end of number\n");
92 /* result: number + 1024^(exp) */
93 return result * ((2 << ((10 * exp) - 1)) ?: 1);
96 /* convert the sector number into a CHS value for the partition table */
97 static void to_chs(long sect, unsigned char chs[3]) {
100 s = (sect % sectors) + 1;
101 sect = sect / sectors;
107 chs[1] = s | ((c >> 2) & 0xC0);
113 /* round the sector number up to the next cylinder */
114 static inline unsigned long round_to_cyl(long sect) {
115 int cyl_size = heads * sectors;
117 return sect + cyl_size - (sect % cyl_size);
120 /* check the partition sizes and write the partition table */
121 static int gen_ptable(int nr)
124 unsigned long sect = 0;
125 int i, fd, ret = -1, start, len;
127 memset(pte, 0, sizeof(struct pte) * 4);
128 for (i = 0; i < nr; i++) {
129 if (!parts[i].size) {
130 fprintf(stderr, "Invalid size in partition %d!\n", i);
133 pte[i].active = ((i + 1) == active) ? 0x80 : 0;
134 pte[i].type = parts[i].type;
135 pte[i].start = cpu_to_le16(start = sect + sectors);
136 sect = round_to_cyl(start + parts[i].size * 2);
137 pte[i].length = cpu_to_le16(len = sect - start);
138 to_chs(start, pte[i].chs_start);
139 to_chs(start + len - 1, pte[i].chs_end);
141 fprintf(stderr, "Partition %d: start=%ld, end=%ld, size=%ld\n", i, (long) start * 512, ((long) start + (long) len) * 512, (long) len * 512);
142 printf("%ld\n", ((long) start * 512));
143 printf("%ld\n", ((long) len * 512));
146 if ((fd = open(filename, O_WRONLY|O_CREAT, 0644)) < 0) {
147 fprintf(stderr, "Can't open output file '%s'\n",filename);
151 lseek(fd, 446, SEEK_SET);
152 if (write(fd, pte, sizeof(struct pte) * 4) != sizeof(struct pte) * 4) {
153 fprintf(stderr, "write failed.\n");
156 lseek(fd, 510, SEEK_SET);
157 if (write(fd, "\x55\xaa", 2) != 2) {
158 fprintf(stderr, "write failed.\n");
168 static void usage(char *prog)
170 fprintf(stderr, "Usage: %s [-v] -h <heads> -s <sectors> -o <outputfile> [-a 0..4] [[-t <type>] -p <size>...] \n", prog);
174 int main (int argc, char **argv)
180 while ((ch = getopt(argc, argv, "h:s:p:a:t:o:v")) != -1) {
189 heads = (int) strtoul(optarg, NULL, 0);
192 sectors = (int) strtoul(optarg, NULL, 0);
196 fprintf(stderr, "Too many partitions\n");
199 parts[part].size = to_kbytes(optarg);
200 parts[part++].type = type;
203 type = (char) strtoul(optarg, NULL, 16);
206 active = (int) strtoul(optarg, NULL, 0);
207 if ((active < 0) || (active > 4))
216 if (argc || (heads <= 0) || (sectors <= 0) || !filename)
219 return gen_ptable(part);