[tools] tools/firmware-utils/ptgen option to use MB rounding
[openwrt/svn-archive/archive.git] / 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
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)
36 #else
37 #error unknown endianness!
38 #endif
39
40 /* Partition table entry */
41 struct pte {
42 unsigned char active;
43 unsigned char chs_start[3];
44 unsigned char type;
45 unsigned char chs_end[3];
46 unsigned int start;
47 unsigned int length;
48 };
49
50 struct partinfo {
51 unsigned long size;
52 int type;
53 };
54
55 int verbose = 0;
56 int active = 1;
57 int heads = -1;
58 int sectors = -1;
59 int kb_align = 0;
60 struct partinfo parts[4];
61 char *filename = NULL;
62
63
64 /*
65 * parse the size argument, which is either
66 * a simple number (K assumed) or
67 * K, M or G
68 *
69 * returns the size in KByte
70 */
71 static long to_kbytes(const char *string) {
72 int exp = 0;
73 long result;
74 char *end;
75
76 result = strtoul(string, &end, 0);
77 switch (tolower(*end)) {
78 case 'k' :
79 case '\0' : exp = 0; break;
80 case 'm' : exp = 1; break;
81 case 'g' : exp = 2; break;
82 default: return 0;
83 }
84
85 if (*end)
86 end++;
87
88 if (*end) {
89 fprintf(stderr, "garbage after end of number\n");
90 return 0;
91 }
92
93 /* result: number + 1024^(exp) */
94 return result * ((2 << ((10 * exp) - 1)) ?: 1);
95 }
96
97 /* convert the sector number into a CHS value for the partition table */
98 static void to_chs(long sect, unsigned char chs[3]) {
99 int c,h,s;
100
101 s = (sect % sectors) + 1;
102 sect = sect / sectors;
103 h = sect % heads;
104 sect = sect / heads;
105 c = sect;
106
107 chs[0] = h;
108 chs[1] = s | ((c >> 2) & 0xC0);
109 chs[2] = c & 0xFF;
110
111 return;
112 }
113
114 /* round the sector number up to the next cylinder */
115 static inline unsigned long round_to_cyl(long sect) {
116 int cyl_size = heads * sectors;
117
118 return sect + cyl_size - (sect % cyl_size);
119 }
120
121 /* round the sector number up to the kb_align boundary */
122 static inline unsigned long round_to_kb(long sect) {
123 return ((sect - 1) / kb_align + 1) * kb_align;
124 }
125
126 /* check the partition sizes and write the partition table */
127 static int gen_ptable(int nr)
128 {
129 struct pte pte[4];
130 unsigned long sect = 0;
131 int i, fd, ret = -1, start, len;
132
133 memset(pte, 0, sizeof(struct pte) * 4);
134 for (i = 0; i < nr; i++) {
135 if (!parts[i].size) {
136 fprintf(stderr, "Invalid size in partition %d!\n", i);
137 return -1;
138 }
139 pte[i].active = ((i + 1) == active) ? 0x80 : 0;
140 pte[i].type = parts[i].type;
141 start = sect + sectors;
142 if (kb_align != 0)
143 start = round_to_kb(start);
144 pte[i].start = cpu_to_le16(start);
145 sect = start + parts[i].size * 2;
146 if (kb_align == 0)
147 sect = round_to_cyl(sect);
148 pte[i].length = cpu_to_le16(len = sect - start);
149 to_chs(start, pte[i].chs_start);
150 to_chs(start + len - 1, pte[i].chs_end);
151 if (verbose)
152 fprintf(stderr, "Partition %d: start=%ld, end=%ld, size=%ld\n", i, (long) start * 512, ((long) start + (long) len) * 512, (long) len * 512);
153 printf("%ld\n", ((long) start * 512));
154 printf("%ld\n", ((long) len * 512));
155 }
156
157 if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
158 fprintf(stderr, "Can't open output file '%s'\n",filename);
159 return -1;
160 }
161
162 lseek(fd, 446, SEEK_SET);
163 if (write(fd, pte, sizeof(struct pte) * 4) != sizeof(struct pte) * 4) {
164 fprintf(stderr, "write failed.\n");
165 goto fail;
166 }
167 lseek(fd, 510, SEEK_SET);
168 if (write(fd, "\x55\xaa", 2) != 2) {
169 fprintf(stderr, "write failed.\n");
170 goto fail;
171 }
172
173 ret = 0;
174 fail:
175 close(fd);
176 return ret;
177 }
178
179 static void usage(char *prog)
180 {
181 fprintf(stderr, "Usage: %s [-v] -h <heads> -s <sectors> -o <outputfile> [-a 0..4] [-l <align kB>] [[-t <type>] -p <size>...] \n", prog);
182 exit(1);
183 }
184
185 int main (int argc, char **argv)
186 {
187 char type = 0x83;
188 int ch;
189 int part = 0;
190
191 while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vl:")) != -1) {
192 switch (ch) {
193 case 'o':
194 filename = optarg;
195 break;
196 case 'v':
197 verbose++;
198 break;
199 case 'h':
200 heads = (int) strtoul(optarg, NULL, 0);
201 break;
202 case 's':
203 sectors = (int) strtoul(optarg, NULL, 0);
204 break;
205 case 'p':
206 if (part > 3) {
207 fprintf(stderr, "Too many partitions\n");
208 exit(1);
209 }
210 parts[part].size = to_kbytes(optarg);
211 parts[part++].type = type;
212 break;
213 case 't':
214 type = (char) strtoul(optarg, NULL, 16);
215 break;
216 case 'a':
217 active = (int) strtoul(optarg, NULL, 0);
218 if ((active < 0) || (active > 4))
219 active = 0;
220 break;
221 case 'l':
222 kb_align = (int) strtoul(optarg, NULL, 0) * 2;
223 break;
224 case '?':
225 default:
226 usage(argv[0]);
227 }
228 }
229 argc -= optind;
230 if (argc || (heads <= 0) || (sectors <= 0) || !filename)
231 usage(argv[0]);
232
233 return gen_ptable(part);
234 }