1 files changed, 115 insertions, 0 deletions
diff --git a/usr.bin/mkimg/mbr.c b/usr.bin/mkimg/mbr.c
new file mode 100644
index 0000000..e859a3f
--- /dev/null
+++ b/usr.bin/mkimg/mbr.c
@@ -0,0 +1,115 @@
+/*-
+ * Copyright (c) 2014 Juniper Networks, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/diskmbr.h>
+#include <sys/endian.h>
+#include <sys/errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "mkimg.h"
+#include "scheme.h"
+
+static struct mkimg_alias mbr_aliases[] = {
+    {	ALIAS_EBR, ALIAS_INT2TYPE(DOSPTYP_EXT) },
+    {	ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) },
+    {	ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) },
+    {	ALIAS_NONE, 0 }		/* Keep last! */
+};
+
+static u_int
+mbr_metadata(u_int where)
+{
+	u_int secs;
+
+	secs = (where == SCHEME_META_IMG_START) ? nsecs : 0;
+	return (secs);
+}
+
+static void
+mbr_chs(u_char *cyl, u_char *hd, u_char *sec, uint32_t lba __unused)
+{
+
+	*cyl = 0xff;		/* XXX */
+	*hd = 0xff;		/* XXX */
+	*sec = 0xff;		/* XXX */
+}
+
+static int
+mbr_write(int fd, lba_t imgsz __unused, void *bootcode)
+{
+	u_char *mbr;
+	struct dos_partition *dpbase, *dp;
+	struct part *part;
+	int error;
+
+	mbr = malloc(secsz);
+	if (mbr == NULL)
+		return (ENOMEM);
+	if (bootcode != NULL) {
+		memcpy(mbr, bootcode, DOSPARTOFF);
+		memset(mbr + DOSPARTOFF, 0, secsz - DOSPARTOFF);
+	} else
+		memset(mbr, 0, secsz);
+	le16enc(mbr + DOSMAGICOFFSET, DOSMAGIC);
+	dpbase = (void *)(mbr + DOSPARTOFF);
+	STAILQ_FOREACH(part, &partlist, link) {
+		dp = dpbase + part->index;
+		dp->dp_flag = (part->index == 0 && bootcode != NULL) ? 0x80 : 0;
+		mbr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect,
+		    part->block);
+		dp->dp_typ = ALIAS_TYPE2INT(part->type);
+		mbr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect,
+		    part->block + part->size - 1);
+		le32enc(&dp->dp_start, part->block);
+		le32enc(&dp->dp_size, part->size);
+	}
+	error = mkimg_seek(fd, 0);
+	if (error == 0) {
+		if (write(fd, mbr, secsz) != (ssize_t)secsz)
+			error = errno;
+	}
+	free(mbr);
+	return (error);
+}
+
+static struct mkimg_scheme mbr_scheme = {
+	.name = "mbr",
+	.description = "Master Boot Record",
+	.aliases = mbr_aliases,
+	.metadata = mbr_metadata,
+	.write = mbr_write,
+	.bootcode = 512,
+	.nparts = NDOSPART,
+	.maxsecsz = 4096
+};
+
+SCHEME_DEFINE(mbr_scheme);