1 files changed, 148 insertions, 0 deletions
diff --git a/commands/memcmp.c b/commands/memcmp.c
new file mode 100644
index 0000000000..4a03862541
--- /dev/null
+++ b/commands/memcmp.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ */
+
+/*
+ * Memory Functions
+ *
+ * Copied from FADS ROM, Dan Malek (dmalek@jlc.net)
+ */
+
+#include <common.h>
+#include <command.h>
+#include <init.h>
+#include <driver.h>
+#include <malloc.h>
+#include <errno.h>
+#include <fs.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <linux/stat.h>
+#include <xfuncs.h>
+
+extern char *mem_rw_buf;
+
+static char *devmem = "/dev/mem";
+
+static int do_memcmp(int argc, char *argv[])
+{
+	loff_t	addr1, addr2, count = ~0;
+	int	mode  = O_RWSIZE_1;
+	char   *sourcefile = devmem;
+	char   *destfile = devmem;
+	int     sourcefd, destfd;
+	char   *rw_buf1;
+	int     ret = 1;
+	int     offset = 0;
+	struct  stat statbuf;
+
+	if (mem_parse_options(argc, argv, "bwls:d:", &mode, &sourcefile,
+			&destfile, NULL) < 0)
+		return 1;
+
+	if (optind + 2 > argc)
+		return COMMAND_ERROR_USAGE;
+
+	addr1 = strtoull_suffix(argv[optind], NULL, 0);
+	addr2 = strtoull_suffix(argv[optind + 1], NULL, 0);
+
+	if (optind + 2 == argc) {
+		if (sourcefile == devmem) {
+			printf("source and count not given\n");
+			return 1;
+		}
+		if (stat(sourcefile, &statbuf)) {
+			perror("stat");
+			return 1;
+		}
+		count = statbuf.st_size - addr1;
+	} else {
+		count = strtoull_suffix(argv[optind + 2], NULL, 0);
+	}
+
+	sourcefd = open_and_lseek(sourcefile, mode | O_RDONLY, addr1);
+	if (sourcefd < 0)
+		return 1;
+
+	destfd = open_and_lseek(destfile, mode | O_RDONLY, addr2);
+	if (destfd < 0) {
+		close(sourcefd);
+		return 1;
+	}
+
+	rw_buf1 = xmalloc(RW_BUF_SIZE);
+
+	while (count > 0) {
+		int now, r1, r2, i;
+
+		now = min((loff_t)RW_BUF_SIZE, count);
+
+		r1 = read(sourcefd, mem_rw_buf,  now);
+		if (r1 < 0) {
+			perror("read");
+			goto out;
+		}
+
+		r2 = read(destfd, rw_buf1, now);
+		if (r2 < 0) {
+			perror("read");
+			goto out;
+		}
+
+		if (r1 != now || r2 != now) {
+			printf("regions differ in size\n");
+			goto out;
+		}
+
+		for (i = 0; i < now; i++) {
+			if (mem_rw_buf[i] != rw_buf1[i]) {
+				printf("files differ at offset %d\n", offset);
+				goto out;
+			}
+			offset++;
+		}
+
+		count -= now;
+	}
+
+	printf("OK\n");
+	ret = 0;
+out:
+	close(sourcefd);
+	close(destfd);
+	free(rw_buf1);
+
+	return ret;
+}
+
+static const __maybe_unused char cmd_memcmp_help[] =
+"Usage: memcmp [OPTIONS] <addr1> <addr2> <count>\n"
+"\n"
+"options:\n"
+"  -b, -w, -l	use byte, halfword, or word accesses\n"
+"  -s <file>    source file (default /dev/mem)\n"
+"  -d <file>    destination file (default /dev/mem)\n"
+"\n"
+"Compare memory regions specified with addr1 and addr2\n"
+"of size <count> bytes. If source is a file count can\n"
+"be left unspecified in which case the whole file is\n"
+"compared\n";
+
+BAREBOX_CMD_START(memcmp)
+	.cmd		= do_memcmp,
+	.usage		= "memory compare",
+	BAREBOX_CMD_HELP(cmd_memcmp_help)
+BAREBOX_CMD_END