allow building of kernel-specific stuff in package/ instead of target/linux/package...

[openwrt-10.03/.git] / package / base-files / src / jffs2root.c

diff --git a/package/base-files/src/jffs2root.c b/package/base-files/src/jffs2root.c
new file mode 100644 (file)
index 0000000..14662fc
--- /dev/null
+++ b/package/base-files/src/jffs2root.c
@@ -0,0 +1,133 @@
+/*
+ * jffs2root.c
+ *
+ * Copyright (C) 2005 Mike Baker 
+ *
+ * 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.
+ *
+ * $Id$
+ *
+ */
+
+#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>
+
+#include <sys/ioctl.h>
+#include <linux/mtd/mtd.h>
+
+#define FILENAME "/dev/mtdblock/1"
+
+struct trx_header {
+       unsigned magic;         /* "HDR0" */
+       unsigned len;           /* Length of file including header */
+       unsigned crc32;         /* 32-bit CRC from flag_version to end of file */
+       unsigned flag_version;  /* 0:15 flags, 16:31 version */
+       unsigned offsets[3];    /* Offsets of partitions from start of header */
+};
+
+unsigned long *crc32;
+
+void init_crc32()
+{
+       unsigned long crc;
+       unsigned long poly = 0xEDB88320L;
+       int n, bit;
+       if ((crc32 = (unsigned long *) malloc(256 * sizeof(unsigned long))) == (void *)-1) {
+               perror("malloc");
+               exit(1);
+       }
+       for (n = 0; n < 256; n++) {
+       crc = (unsigned long) n;
+       for (bit = 0; bit < 8; bit++)
+               crc = (crc & 1) ? (poly ^ (crc >> 1)) : (crc >> 1);
+       crc32[n] = crc;
+       }
+}
+
+unsigned int crc32buf(char *buf, size_t len)
+{
+       unsigned int crc = 0xFFFFFFFF;
+       for (; len; len--, buf++)
+       crc = crc32[(crc ^ *buf) & 0xff] ^ (crc >> 8);
+       return crc;
+}
+
+int main(int argc, char **argv)
+{
+       int fd;
+       struct mtd_info_user mtdInfo;
+       unsigned long len;
+       struct trx_header *ptr;
+       char *buf;
+       
+       if (((fd = open(FILENAME, O_RDWR))      < 0)
+                       || ((len = lseek(fd, 0, SEEK_END)) < 0)
+                       || ((ptr = (struct trx_header *) mmap(0, len, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0)) == (void *) (-1))
+                       || (ptr->magic != 0x30524448)) {
+               printf("Error reading trx info\n");
+               exit(-1);
+       }
+       close (fd);
+
+       if (((fd = open("/dev/mtd/1", O_RDWR))  < 0)
+                       || (ioctl(fd, MEMGETINFO, &mtdInfo))) {
+               fprintf(stderr, "Could not get MTD device info from %s\n", FILENAME);
+               close(fd);
+               exit(1);
+       }
+       close(fd);
+
+       if (argc > 1 && !strcmp(argv[1],"--move")) {
+               if (ptr->offsets[2] >= ptr->len) {
+                       printf("Partition already moved outside trx\n");
+               } else {
+                       init_crc32();
+                       ptr->offsets[2] +=      (mtdInfo.erasesize - 1);
+                       ptr->offsets[2] &= ~(mtdInfo.erasesize - 1);
+                       ptr->len = ptr->offsets[2];
+                       ptr->crc32 = crc32buf((void *) &(ptr->flag_version), ptr->len - offsetof(struct trx_header, flag_version));
+                       msync(ptr,sizeof(struct trx_header),MS_SYNC|MS_INVALIDATE);
+                       printf("Partition moved; please reboot\n");
+               }
+       } else if (argc > 1 && !strcmp(argv[1], "--clean")) {
+               buf = (char *) ptr;
+               if (buf[ptr->offsets[1] - 1] == 0) {
+                       init_crc32();
+                       buf[ptr->offsets[1] - 1] = 1;
+                       ptr->crc32 = crc32buf((void *) &(ptr->flag_version), ptr->len - offsetof(struct trx_header, flag_version));
+                       msync(ptr,sizeof(struct trx_header),MS_SYNC|MS_INVALIDATE);
+                       printf("Partition marked as clean\n");
+               }
+       } else {
+               int x;
+               printf(" erase: 0x%08x\n",mtdInfo.erasesize);
+               printf("=== trx ===\n");
+               printf("mapped: 0x%08x\n", (unsigned)ptr);
+               printf(" magic: 0x%08x\n", ptr->magic);
+               printf("         len: 0x%08x\n", ptr->len);
+               printf("         crc: 0x%08x\n", ptr->crc32);
+               for (x = 0; x < 3; x++)
+                       printf(" offset[%d]: 0x%08x\n", x, ptr->offsets[x]);
+       }
+
+       munmap((void *) ptr, len);
+       return 0;
+}