Add imls utility command

This patch adds, under tools folder, a new command called imls. Its
goal is the same of UBoot's imls but it can be used as Linux shell
command. It reads from raw mtd partition and prints the list of the
stored images.

Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com>

1 files changed, 270 insertions, 0 deletions

diff --git a/tools/imls/imls.c b/tools/imls/imls.c
new file mode 100644
index 0000000..b21c505
--- /dev/null
+++ b/tools/imls/imls.c
@@ -0,0 +1,270 @@
+/*
+ * (C) Copyright 2009 Marco Stornelli
+ *
+ * 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
+ */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <asm/page.h>
+
+#ifdef MTD_OLD
+#include <stdint.h>
+#include <linux/mtd/mtd.h>
+#else
+#define  __user	/* nothing */
+#include <mtd/mtd-user.h>
+#endif
+
+#include <sha1.h>
+#include <fdt.h>
+#include <libfdt.h>
+#include <fdt_support.h>
+#include <image.h>
+
+#define MIN(a, b) (((a) < (b)) ? (a) : (b))
+
+extern unsigned long crc32(unsigned long crc, const char *buf, unsigned int len);
+static void usage(void);
+static int image_verify_header(char *ptr, int fd);
+static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start);
+
+char	*cmdname;
+char	*devicefile;
+
+unsigned int sectorcount = 0;
+int sflag = 0;
+unsigned int sectoroffset = 0;
+unsigned int sectorsize = 0;
+int cflag = 0;
+
+int main (int argc, char **argv)
+{
+	int fd = -1, err = 0, readbyte = 0, j;
+	struct mtd_info_user mtdinfo;
+	char buf[sizeof(image_header_t)];
+	int found = 0;
+
+	cmdname = *argv;
+
+	while (--argc > 0 && **++argv == '-') {
+		while (*++*argv) {
+			switch (**argv) {
+			case 'c':
+				if (--argc <= 0)
+					usage ();
+				sectorcount = (unsigned int)atoi(*++argv);
+				cflag = 1;
+				goto NXTARG;
+			case 'o':
+				if (--argc <= 0)
+					usage ();
+				sectoroffset = (unsigned int)atoi(*++argv);
+				goto NXTARG;
+
+			case 's':
+				if (--argc <= 0)
+					usage ();
+				sectorsize = (unsigned int)atoi(*++argv);
+				sflag = 1;
+				goto NXTARG;
+			default:
+				usage ();
+			}
+		}
+NXTARG:		;
+	}
+
+	if (argc != 1 || cflag == 0 || sflag == 0)
+		usage();
+
+	devicefile = *argv;
+
+	fd = open(devicefile, O_RDONLY);
+	if (fd < 0) {
+		fprintf (stderr, "%s: Can't open %s: %s\n",
+			 cmdname, devicefile, strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	err = ioctl(fd, MEMGETINFO, &mtdinfo);
+	if (err < 0) {
+		fprintf(stderr, "%s: Cannot get MTD information: %s\n",cmdname,
+			strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+
+	if (mtdinfo.type != MTD_NORFLASH && mtdinfo.type != MTD_NANDFLASH) {
+		fprintf(stderr, "%s: Unsupported flash type %u\n",
+			cmdname, mtdinfo.type);
+		exit(EXIT_FAILURE);
+	}
+
+	if (sectorsize * sectorcount != mtdinfo.size) {
+		fprintf(stderr, "%s: Partition size (%d) incompatible with "
+			"sector size and count\n", cmdname, mtdinfo.size);
+		exit(EXIT_FAILURE);
+	}
+
+	if (sectorsize * sectoroffset >= mtdinfo.size) {
+		fprintf(stderr, "%s: Partition size (%d) incompatible with "
+			"sector offset given\n", cmdname, mtdinfo.size);
+		exit(EXIT_FAILURE);
+	}
+
+	if (sectoroffset > sectorcount - 1) {
+		fprintf(stderr, "%s: Sector offset cannot be grater than "
+			"sector count minus one\n", cmdname);
+		exit(EXIT_FAILURE);
+	}
+
+	printf("Searching....\n");
+
+	for (j = sectoroffset; j < sectorcount; ++j) {
+
+		if (lseek(fd, j*sectorsize, SEEK_SET) != j*sectorsize) {
+			fprintf(stderr, "%s: lseek failure: %s\n",
+			cmdname, strerror(errno));
+			exit(EXIT_FAILURE);
+		}
+
+		err = flash_bad_block(fd, mtdinfo.type, j*sectorsize);
+		if (err < 0)
+			exit(EXIT_FAILURE);
+		if (err)
+			continue; /* Skip and jump to next */
+
+		readbyte = read(fd, buf, sizeof(image_header_t));
+		if (readbyte != sizeof(image_header_t)) {
+			fprintf(stderr, "%s: Can't read from device: %s\n",
+			cmdname, strerror(errno));
+			exit(EXIT_FAILURE);
+		}
+
+		if (fdt_check_header(buf)) {
+			/* old-style image */
+			if (image_verify_header(buf, fd)) {
+				found = 1;
+				image_print_contents((image_header_t *)buf);
+			}
+		} else {
+			/* FIT image */
+			fit_print_contents(buf);
+		}
+
+	}
+
+	close(fd);
+
+	if(!found)
+		printf("No images found\n");
+
+	exit(EXIT_SUCCESS);
+}
+
+void usage()
+{
+	fprintf (stderr, "Usage:\n"
+			 "       %s [-o offset] -s size -c count device\n"
+			 "          -o ==> number of sectors to use as offset\n"
+			 "          -c ==> number of sectors\n"
+			 "          -s ==> size of sectors (byte)\n",
+		cmdname);
+
+	exit(EXIT_FAILURE);
+}
+
+static int image_verify_header(char *ptr, int fd)
+{
+	int len, nread;
+	char *data;
+	uint32_t checksum;
+	image_header_t *hdr = (image_header_t *)ptr;
+	char buf[PAGE_SIZE];
+
+	if (image_get_magic(hdr) != IH_MAGIC)
+		return 0;
+
+	data = (char *)hdr;
+	len  = image_get_header_size();
+
+	checksum = image_get_hcrc(hdr);
+	hdr->ih_hcrc = htonl(0);	/* clear for re-calculation */
+
+	if (crc32(0, data, len) != checksum) {
+		fprintf(stderr,
+		      "%s: Maybe image found but it has bad header checksum!\n",
+		      cmdname);
+		return 0;
+	}
+
+	len = image_get_size(hdr);
+	checksum = 0;
+
+	while (len > 0) {
+		nread = read(fd, buf, MIN(len,PAGE_SIZE));
+		if (nread != MIN(len,PAGE_SIZE)) {
+			fprintf(stderr,
+				"%s: Error while reading: %s\n",
+				cmdname, strerror(errno));
+			exit(EXIT_FAILURE);
+		}
+		checksum = crc32(checksum, buf, nread);
+		len -= nread;
+	}
+
+	if (checksum != image_get_dcrc(hdr)) {
+		fprintf (stderr,
+			"%s: Maybe image found but it has corrupted data!\n",
+			cmdname);
+		return 0;
+	}
+
+	return 1;
+}
+
+/*
+ * Test for bad block on NAND, just returns 0 on NOR, on NAND:
+ * 0	- block is good
+ * > 0	- block is bad
+ * < 0	- failed to test
+ */
+static int flash_bad_block(int fd, uint8_t mtd_type, loff_t start)
+{
+	if (mtd_type == MTD_NANDFLASH) {
+		int badblock = ioctl(fd, MEMGETBADBLOCK, &start);
+
+		if (badblock < 0) {
+			fprintf(stderr,"%s: Cannot read bad block mark: %s\n",
+				cmdname, strerror(errno));
+			return badblock;
+		}
+
+		if (badblock) {
+			return badblock;
+		}
+	}
+
+	return 0;
+}