[tools] rename patch-cmdline and add code for patching DTB files into kernel images

[openwrt/svn-archive/archive.git] / tools / patch-image / src / patch-dtb.c

diff --git a/tools/patch-image/src/patch-dtb.c b/tools/patch-image/src/patch-dtb.c
new file mode 100644 (file)
index 0000000..161e1dc
--- /dev/null
+++ b/tools/patch-image/src/patch-dtb.c
@@ -0,0 +1,101 @@
+/*
+ * patch-dtb.c - patch a dtb into an image
+ *
+ * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ * based on patch-cmdline.c
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <string.h>
+
+#define SEARCH_SPACE   (16 * 1024)
+#define DTB_MAX        (16 * 1024)
+
+int main(int argc, char **argv)
+{
+       int fd, fddtb, found = 0, len, ret = -1;
+       char *ptr, *ptrdtb, *p;
+       struct stat s;
+
+       if (argc != 3) {
+               fprintf(stderr, "Usage: %s <file> <dtb>\n", argv[0]);
+               goto err1;
+       }
+       fddtb = open(argv[1], O_RDONLY);
+       if (!fddtb)
+               goto err1;
+
+       if (stat(argv[2], &s)) {
+               fprintf(stderr, "DTB not found\n");
+               goto err1;
+       }
+
+       len = s.st_size;
+       if (len + 8 > DTB_MAX) {
+               fprintf(stderr, "DTB too big\n");
+               goto err1;
+       }
+
+        if (((fddtb = open(argv[2], O_RDONLY)) < 0) ||
+               (ptrdtb = (char *) mmap(0, DTB_MAX, PROT_READ, MAP_SHARED, fddtb, 0)) == (void *) (-1)) {
+               fprintf(stderr, "Could not open DTB");
+               goto err2;
+       }
+
+       if (((fd = open(argv[1], O_RDWR)) < 0) ||
+               (ptr = (char *) mmap(0, SEARCH_SPACE + DTB_MAX, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1)) {
+               fprintf(stderr, "Could not open kernel image");
+               goto err3;
+       }
+
+       for (p = ptr; p < (ptr + SEARCH_SPACE); p += 4) {
+               if (memcmp(p, "OWRTDTB:", 8) == 0) {
+                       found = 1;
+                       p += 8;
+                       break;
+               }
+       }
+       if (!found) {
+               fprintf(stderr, "DTB marker not found!\n");
+               goto err4;
+       }
+
+       memset(p, 0, DTB_MAX - 8);
+       memcpy(p, ptrdtb, len);
+       msync(p, len, MS_SYNC|MS_INVALIDATE);
+       ret = 0;
+
+err4:
+       munmap((void *) ptr, len);
+err3:
+       if (fd > 0)
+               close(fd);
+       munmap((void *) ptrdtb, len);
+err2:
+       if (fddtb > 0)
+               close(fddtb);
+err1:
+       return ret;
+}