tools/firmware-utils/src/mkzcfw.c

   1 /*
   2  * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 as published
   6  * by the Free Software Foundation.
   7  *
   8  */
   9
  10 #include <stdio.h>
  11 #include <stdlib.h>
  12 #include <stdint.h>
  13 #include <string.h>
  14 #include <unistd.h>     /* for unlink() */
  15 #include <libgen.h>
  16 #include <getopt.h>     /* for getopt() */
  17 #include <stdarg.h>
  18 #include <errno.h>
  19 #include <sys/stat.h>
  20
  21 #include "cyg_crc.h"
  22
  23 #if (__BYTE_ORDER == __BIG_ENDIAN)
  24 #  define HOST_TO_BE32(x)       (x)
  25 #  define BE32_TO_HOST(x)       (x)
  26 #  define HOST_TO_LE32(x)       bswap_32(x)
  27 #  define LE32_TO_HOST(x)       bswap_32(x)
  28 #else
  29 #  define HOST_TO_BE32(x)       bswap_32(x)
  30 #  define BE32_TO_HOST(x)       bswap_32(x)
  31 #  define HOST_TO_LE32(x)       (x)
  32 #  define LE32_TO_HOST(x)       (x)
  33 #endif
  34
  35 #define MAGIC_FIRMWARE  0x6d726966      /* 'firm' */
  36 #define MAGIC_KERNEL    0x676d694b      /* 'Kimg' */
  37 #define MAGIC_ROOTFS    0x676d6952      /* 'Rimg' */
  38
  39 struct file_info {
  40         char            *file_name;     /* name of the file */
  41         uint32_t        file_size;      /* length of the file */
  42 };
  43
  44 struct fw_header {
  45         uint32_t        magic;
  46         uint32_t        length;
  47         uint32_t        unk1;
  48         uint32_t        unk2;
  49 } __attribute__ ((packed));
  50
  51 struct fw_tail {
  52         uint32_t        hw_id;
  53         uint32_t        crc;
  54 } __attribute__ ((packed));
  55
  56 struct board_info {
  57         char            *id;
  58         uint32_t        hw_id;
  59         uint32_t        kernel_len;
  60         uint32_t        rootfs_len;
  61 };
  62
  63 /*
  64  * Globals
  65  */
  66 static char *ofname;
  67 static char *progname;
  68
  69 static char *board_id;
  70 static struct board_info *board;
  71 static struct file_info kernel_info;
  72 static struct file_info rootfs_info;
  73
  74
  75 static struct board_info boards[] = {
  76         {
  77                 .id             = "ZCN-1523H-2-8",
  78                 .hw_id          = 0x66661523,
  79                 .kernel_len     = 0x170000,
  80                 .rootfs_len     = 0x610000,
  81         }, {
  82                 .id             = "ZCN-1523H-5-16",
  83                 .hw_id          = 0x6615235A,
  84                 .kernel_len     = 0x170000,
  85                 .rootfs_len     = 0x610000,
  86         }, {
  87                 /* terminating entry */
  88         }
  89 };
  90
  91 /*
  92  * Message macros
  93  */
  94 #define ERR(fmt, ...) do { \
  95         fflush(0); \
  96         fprintf(stderr, "[%s] *** error: " fmt "\n", \
  97                         progname, ## __VA_ARGS__ ); \
  98 } while (0)
  99
 100 #define ERRS(fmt, ...) do { \
 101         int save = errno; \
 102         fflush(0); \
 103         fprintf(stderr, "[%s] *** error: " fmt ": %s\n", \
 104                         progname, ## __VA_ARGS__, strerror(save)); \
 105 } while (0)
 106
 107 #define DBG(fmt, ...) do { \
 108         fprintf(stderr, "[%s] " fmt "\n", progname, ## __VA_ARGS__ ); \
 109 } while (0)
 110
 111 static struct board_info *find_board(char *id)
 112 {
 113         struct board_info *ret;
 114         struct board_info *board;
 115
 116         ret = NULL;
 117         for (board = boards; board->id != NULL; board++){
 118                 if (strcasecmp(id, board->id) == 0) {
 119                         ret = board;
 120                         break;
 121                 }
 122         };
 123
 124         return ret;
 125 }
 126
 127 static void usage(int status)
 128 {
 129         FILE *stream = (status != EXIT_SUCCESS) ? stderr : stdout;
 130         struct board_info *board;
 131
 132         fprintf(stream, "Usage: %s [OPTIONS...]\n", progname);
 133         fprintf(stream,
 134 "\n"
 135 "Options:\n"
 136 "  -B <board>      create image for the board specified with <board>\n"
 137 "  -k <file>       read kernel image from the file <file>\n"
 138 "  -r <file>       read rootfs image from the file <file>\n"
 139 "  -o <file>       write output to the file <file>\n"
 140 "  -h              show this screen\n"
 141         );
 142
 143         exit(status);
 144 }
 145
 146 static int get_file_stat(struct file_info *fdata)
 147 {
 148         struct stat st;
 149         int res;
 150
 151         if (fdata->file_name == NULL)
 152                 return 0;
 153
 154         res = stat(fdata->file_name, &st);
 155         if (res){
 156                 ERRS("stat failed on %s", fdata->file_name);
 157                 return res;
 158         }
 159
 160         fdata->file_size = st.st_size;
 161         return 0;
 162 }
 163
 164 static int read_to_buf(struct file_info *fdata, char *buf)
 165 {
 166         FILE *f;
 167         int ret = EXIT_FAILURE;
 168
 169         f = fopen(fdata->file_name, "r");
 170         if (f == NULL) {
 171                 ERRS("could not open \"%s\" for reading", fdata->file_name);
 172                 goto out;
 173         }
 174
 175         errno = 0;
 176         fread(buf, fdata->file_size, 1, f);
 177         if (errno != 0) {
 178                 ERRS("unable to read from file \"%s\"", fdata->file_name);
 179                 goto out_close;
 180         }
 181
 182         ret = EXIT_SUCCESS;
 183
 184  out_close:
 185         fclose(f);
 186  out:
 187         return ret;
 188 }
 189
 190 static int check_options(void)
 191 {
 192         int ret;
 193
 194         if (board_id == NULL) {
 195                 ERR("no board specified");
 196                 return -1;
 197         }
 198
 199         board = find_board(board_id);
 200         if (board == NULL) {
 201                 ERR("unknown/unsupported board id \"%s\"", board_id);
 202                 return -1;
 203         }
 204
 205         if (kernel_info.file_name == NULL) {
 206                 ERR("no kernel image specified");
 207                 return -1;
 208         }
 209
 210         ret = get_file_stat(&kernel_info);
 211         if (ret)
 212                 return ret;
 213
 214         if (kernel_info.file_size > board->kernel_len) {
 215                 ERR("kernel image is too big");
 216                 return -1;
 217         }
 218
 219         if (rootfs_info.file_name == NULL) {
 220                 ERR("no rootfs image specified");
 221                 return -1;
 222         }
 223
 224         ret = get_file_stat(&rootfs_info);
 225         if (ret)
 226                 return ret;
 227
 228         if (rootfs_info.file_size > board->rootfs_len) {
 229                 ERR("rootfs image is too big");
 230                 return -1;
 231         }
 232
 233         if (ofname == NULL) {
 234                 ERR("no output file specified");
 235                 return -1;
 236         }
 237
 238         return 0;
 239 }
 240
 241 static int write_fw(char *data, int len)
 242 {
 243         FILE *f;
 244         int ret = EXIT_FAILURE;
 245
 246         f = fopen(ofname, "w");
 247         if (f == NULL) {
 248                 ERRS("could not open \"%s\" for writing", ofname);
 249                 goto out;
 250         }
 251
 252         errno = 0;
 253         fwrite(data, len, 1, f);
 254         if (errno) {
 255                 ERRS("unable to write output file");
 256                 goto out_flush;
 257         }
 258
 259         DBG("firmware file \"%s\" completed", ofname);
 260
 261         ret = EXIT_SUCCESS;
 262
 263  out_flush:
 264         fflush(f);
 265         fclose(f);
 266         if (ret != EXIT_SUCCESS) {
 267                 unlink(ofname);
 268         }
 269  out:
 270         return ret;
 271 }
 272
 273 static int build_fw(void)
 274 {
 275         int buflen;
 276         char *buf;
 277         char *p;
 278         int ret = EXIT_FAILURE;
 279         int writelen = 0;
 280         uint32_t crc;
 281         struct fw_header *hdr;
 282         struct fw_tail *tail;
 283
 284         buflen = 3 * sizeof(struct fw_header) +
 285                  kernel_info.file_size + rootfs_info.file_size +
 286                  3 * sizeof(struct fw_tail);
 287
 288         buf = malloc(buflen);
 289         if (!buf) {
 290                 ERR("no memory for buffer\n");
 291                 goto out;
 292         }
 293
 294         p = buf;
 295         memset(p, 0, buflen);
 296
 297         /* fill firmware header */
 298         hdr = (struct fw_header *) p;
 299         hdr->magic = HOST_TO_LE32(MAGIC_FIRMWARE);
 300         hdr->length = HOST_TO_LE32(buflen - sizeof(struct fw_header));
 301         p += sizeof(struct fw_header);
 302
 303         /* fill kernel block header */
 304         hdr = (struct fw_header *) p;
 305         hdr->magic = HOST_TO_LE32(MAGIC_KERNEL);
 306         hdr->length = HOST_TO_LE32(kernel_info.file_size +
 307                                    sizeof(struct fw_tail));
 308         p += sizeof(struct fw_header);
 309
 310         /* read kernel data */
 311         ret = read_to_buf(&kernel_info, p);
 312         if (ret)
 313                 goto out_free_buf;
 314
 315         /* fill firmware tail */
 316         tail = (struct fw_tail *) (p + kernel_info.file_size);
 317         tail->hw_id = HOST_TO_BE32(board->hw_id);
 318         tail->crc = HOST_TO_BE32(cyg_crc32(p, kernel_info.file_size +
 319                                            sizeof(struct fw_tail) - 4));
 320
 321         p += kernel_info.file_size + sizeof(struct fw_tail);
 322
 323         /* fill rootfs block header */
 324         hdr = (struct fw_header *) p;
 325         hdr->magic = HOST_TO_LE32(MAGIC_ROOTFS);
 326         hdr->length = HOST_TO_LE32(rootfs_info.file_size +
 327                                    sizeof(struct fw_tail));
 328         p += sizeof(struct fw_header);
 329
 330         /* read rootfs data */
 331         ret = read_to_buf(&rootfs_info, p);
 332         if (ret)
 333                 goto out_free_buf;
 334
 335         /* fill firmware tail */
 336         tail = (struct fw_tail *) (p + rootfs_info.file_size);
 337         tail->hw_id = HOST_TO_BE32(board->hw_id);
 338         tail->crc = HOST_TO_BE32(cyg_crc32(p, rootfs_info.file_size +
 339                                            sizeof(struct fw_tail) - 4));
 340
 341         p += rootfs_info.file_size + sizeof(struct fw_tail);
 342
 343         /* fill firmware tail */
 344         tail = (struct fw_tail *) p;
 345         tail->hw_id = HOST_TO_BE32(board->hw_id);
 346         tail->crc = HOST_TO_BE32(cyg_crc32(buf + sizeof(struct fw_header),
 347                                  buflen - sizeof(struct fw_header) - 4));
 348
 349         ret = write_fw(buf, buflen);
 350         if (ret)
 351                 goto out_free_buf;
 352
 353         ret = EXIT_SUCCESS;
 354
 355  out_free_buf:
 356         free(buf);
 357  out:
 358         return ret;
 359 }
 360
 361 int main(int argc, char *argv[])
 362 {
 363         int ret = EXIT_FAILURE;
 364         int err;
 365
 366         FILE *outfile;
 367
 368         progname = basename(argv[0]);
 369
 370         while ( 1 ) {
 371                 int c;
 372
 373                 c = getopt(argc, argv, "B:k:r:o:h");
 374                 if (c == -1)
 375                         break;
 376
 377                 switch (c) {
 378                 case 'B':
 379                         board_id = optarg;
 380                         break;
 381                 case 'k':
 382                         kernel_info.file_name = optarg;
 383                         break;
 384                 case 'r':
 385                         rootfs_info.file_name = optarg;
 386                         break;
 387                 case 'o':
 388                         ofname = optarg;
 389                         break;
 390                 case 'h':
 391                         usage(EXIT_SUCCESS);
 392                         break;
 393                 default:
 394                         usage(EXIT_FAILURE);
 395                         break;
 396                 }
 397         }
 398
 399         ret = check_options();
 400         if (ret)
 401                 goto out;
 402
 403         ret = build_fw();
 404
 405  out:
 406         return ret;
 407 }
 408