101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/*
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* patch-dtb.c - patch a dtb into an image
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*
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* Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2012 John Crispin <blogic@openwrt.org>
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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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* based on patch-cmdline.c
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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 <string.h>
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#define SEARCH_SPACE (16 * 1024)
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#define DTB_MAX (16 * 1024)
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int main(int argc, char **argv)
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{
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int fd, fddtb, found = 0, len, ret = -1;
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char *ptr, *ptrdtb, *p;
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struct stat s;
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if (argc != 3) {
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fprintf(stderr, "Usage: %s <file> <dtb>\n", argv[0]);
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goto err1;
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}
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fddtb = open(argv[1], O_RDONLY);
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if (!fddtb)
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goto err1;
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if (stat(argv[2], &s)) {
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fprintf(stderr, "DTB not found\n");
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goto err1;
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}
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len = s.st_size;
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if (len + 8 > DTB_MAX) {
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fprintf(stderr, "DTB too big\n");
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goto err1;
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}
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if (((fddtb = open(argv[2], O_RDONLY)) < 0) ||
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(ptrdtb = (char *) mmap(0, DTB_MAX, PROT_READ, MAP_SHARED, fddtb, 0)) == (void *) (-1)) {
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fprintf(stderr, "Could not open DTB");
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goto err2;
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}
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if (((fd = open(argv[1], O_RDWR)) < 0) ||
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(ptr = (char *) mmap(0, SEARCH_SPACE + DTB_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) {
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fprintf(stderr, "Could not open kernel image");
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goto err3;
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}
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for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) {
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if (memcmp(p, "OWRTDTB:", 8) == 0) {
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found = 1;
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p += 8;
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break;
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}
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}
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if (!found) {
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fprintf(stderr, "DTB marker not found!\n");
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goto err4;
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}
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memset(p, 0, DTB_MAX - 8);
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memcpy(p, ptrdtb, len);
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msync(p, len, MS_SYNC|MS_INVALIDATE);
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ret = 0;
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err4:
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munmap((void *) ptr, len);
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err3:
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if (fd > 0)
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close(fd);
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munmap((void *) ptrdtb, len);
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err2:
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if (fddtb > 0)
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close(fddtb);
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err1:
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return ret;
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}
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