Root/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 */
41struct 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
50struct partinfo {
51    unsigned long size;
52    int type;
53};
54
55int verbose = 0;
56int active = 1;
57int heads = -1;
58int sectors = -1;
59int kb_align = 0;
60struct partinfo parts[4];
61char *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 */
71static 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 */
98static 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 */
115static 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 */
122static 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 */
127static 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;
174fail:
175    close(fd);
176    return ret;
177}
178
179static 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
185int 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}
235

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