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domenico
270
package/system/mtd/src/trx.c
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270
package/system/mtd/src/trx.c
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/*
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* trx.c
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*
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* Copyright (C) 2005 Mike Baker
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* Copyright (C) 2008 Felix Fietkau <nbd@nbd.name>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stddef.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <endian.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <mtd/mtd-user.h>
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#include "mtd.h"
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#include "crc32.h"
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#define TRX_MAGIC 0x30524448 /* "HDR0" */
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#define TRX_CRC32_DATA_OFFSET 12 /* First 12 bytes are not covered by CRC32 */
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#define TRX_CRC32_DATA_SIZE 16
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struct trx_header {
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uint32_t magic; /* "HDR0" */
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uint32_t len; /* Length of file including header */
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uint32_t crc32; /* 32-bit CRC from flag_version to end of file */
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uint32_t flag_version; /* 0:15 flags, 16:31 version */
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uint32_t offsets[3]; /* Offsets of partitions from start of header */
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};
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#define min(x,y) ({ \
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typeof(x) _x = (x); \
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typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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_x < _y ? _x : _y; })
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define STORE32_LE(X) ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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#define STORE32_LE(X) (X)
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#else
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#error unknown endianness!
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#endif
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ssize_t pread(int fd, void *buf, size_t count, off_t offset);
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ssize_t pwrite(int fd, const void *buf, size_t count, off_t offset);
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int
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trx_fixup(int fd, const char *name)
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{
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struct mtd_info_user mtdInfo;
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unsigned long len;
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struct trx_header *trx;
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void *ptr, *scan;
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int bfd;
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if (ioctl(fd, MEMGETINFO, &mtdInfo) < 0) {
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fprintf(stderr, "Failed to get mtd info\n");
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goto err;
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}
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len = mtdInfo.size;
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if (mtdInfo.size <= 0) {
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fprintf(stderr, "Invalid MTD device size\n");
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goto err;
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}
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bfd = mtd_open(name, true);
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ptr = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, bfd, 0);
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if (!ptr || (ptr == (void *) -1)) {
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perror("mmap");
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fprintf(stderr, "Mapping the TRX header failed\n");
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goto err1;
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}
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trx = ptr;
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if (trx->magic != TRX_MAGIC) {
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fprintf(stderr, "TRX header not found\n");
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goto err;
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}
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scan = ptr + offsetof(struct trx_header, flag_version);
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trx->crc32 = crc32buf(scan, trx->len - (scan - ptr));
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msync(ptr, sizeof(struct trx_header), MS_SYNC|MS_INVALIDATE);
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munmap(ptr, len);
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close(bfd);
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return 0;
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err1:
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close(bfd);
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err:
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return -1;
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}
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#ifndef target_ar71xx
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int
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trx_check(int imagefd, const char *mtd, char *buf, int *len)
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{
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const struct trx_header *trx = (const struct trx_header *) buf;
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int fd;
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if (strcmp(mtd, "firmware") != 0)
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return 1;
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if (*len < 32) {
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*len += read(imagefd, buf + *len, 32 - *len);
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if (*len < 32) {
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fprintf(stdout, "Could not get image header, file too small (%d bytes)\n", *len);
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return 0;
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}
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}
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if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
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if (quiet < 2) {
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fprintf(stderr, "Bad trx header\n");
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fprintf(stderr, "This is not the correct file format; refusing to flash.\n"
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"Please specify the correct file or use -f to force.\n");
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}
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return 0;
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}
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/* check if image fits to mtd device */
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fd = mtd_check_open(mtd);
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if(fd < 0) {
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fprintf(stderr, "Could not open mtd device: %s\n", mtd);
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exit(1);
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}
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if(mtdsize < trx->len) {
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fprintf(stderr, "Image too big for partition: %s\n", mtd);
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close(fd);
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return 0;
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}
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close(fd);
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return 1;
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}
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#endif
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int
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mtd_fixtrx(const char *mtd, size_t offset, size_t data_size)
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{
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size_t data_offset;
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int fd;
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struct trx_header *trx;
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char *first_block;
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char *buf, *to;
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ssize_t res;
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size_t block_offset;
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if (quiet < 2)
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fprintf(stderr, "Trying to fix trx header in %s at 0x%x...\n", mtd, offset);
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fd = mtd_check_open(mtd);
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if(fd < 0) {
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fprintf(stderr, "Could not open mtd device: %s\n", mtd);
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exit(1);
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}
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data_offset = offset + TRX_CRC32_DATA_OFFSET;
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if (data_size)
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data_size += TRX_CRC32_DATA_SIZE;
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else
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data_size = erasesize - TRX_CRC32_DATA_OFFSET;
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block_offset = offset & ~(erasesize - 1);
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offset -= block_offset;
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if (data_offset + data_size > mtdsize) {
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fprintf(stderr, "Offset too large, device size 0x%x\n", mtdsize);
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exit(1);
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}
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first_block = malloc(erasesize);
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if (!first_block) {
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perror("malloc");
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exit(1);
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}
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res = pread(fd, first_block, erasesize, block_offset);
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if (res != erasesize) {
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perror("pread");
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exit(1);
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}
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trx = (struct trx_header *)(first_block + offset);
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if (trx->magic != STORE32_LE(0x30524448)) {
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fprintf(stderr, "No trx magic found\n");
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exit(1);
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}
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buf = malloc(data_size);
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if (!buf) {
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perror("malloc");
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exit(1);
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}
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to = buf;
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while (data_size) {
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size_t read_block_offset = data_offset & ~(erasesize - 1);
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size_t read_chunk;
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read_chunk = erasesize - (data_offset & (erasesize - 1));
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read_chunk = min(read_chunk, data_size);
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/* Read from good blocks only to match CFE behavior */
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if (!mtd_block_is_bad(fd, read_block_offset)) {
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res = pread(fd, to, read_chunk, data_offset);
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if (res != read_chunk) {
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perror("pread");
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exit(1);
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}
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to += read_chunk;
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}
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data_offset += read_chunk;
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data_size -= read_chunk;
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}
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data_size = to - buf;
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if (trx->len == STORE32_LE(data_size + TRX_CRC32_DATA_OFFSET) &&
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trx->crc32 == STORE32_LE(crc32buf(buf, data_size))) {
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if (quiet < 2)
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fprintf(stderr, "Header already fixed, exiting\n");
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close(fd);
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return 0;
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}
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trx->len = STORE32_LE(data_size + offsetof(struct trx_header, flag_version));
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trx->crc32 = STORE32_LE(crc32buf(buf, data_size));
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if (mtd_erase_block(fd, block_offset)) {
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fprintf(stderr, "Can't erease block at 0x%x (%s)\n", block_offset, strerror(errno));
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exit(1);
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}
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if (quiet < 2)
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fprintf(stderr, "New crc32: 0x%x, rewriting block\n", trx->crc32);
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if (pwrite(fd, first_block, erasesize, block_offset) != erasesize) {
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fprintf(stderr, "Error writing block (%s)\n", strerror(errno));
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exit(1);
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}
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if (quiet < 2)
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fprintf(stderr, "Done.\n");
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close (fd);
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sync();
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return 0;
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}
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