1 files changed, 128 insertions, 0 deletions
diff --git a/usr.bin/mkimg/ebr.c b/usr.bin/mkimg/ebr.c
new file mode 100644
index 0000000..ff6a846
--- /dev/null
+++ b/usr.bin/mkimg/ebr.c
@@ -0,0 +1,128 @@
+/*-
+ * 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 ebr_aliases[] = {
+    {	ALIAS_FAT32, ALIAS_INT2TYPE(DOSPTYP_FAT32) },
+    {	ALIAS_FREEBSD, ALIAS_INT2TYPE(DOSPTYP_386BSD) },
+    {	ALIAS_NONE, 0 }
+};
+
+static u_int
+ebr_metadata(u_int where)
+{
+	u_int secs;
+
+	secs = (where == SCHEME_META_PART_BEFORE) ? nsecs : 0;
+	return (secs);
+}
+
+static void
+ebr_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
+ebr_write(int fd, lba_t imgsz __unused, void *bootcode __unused)
+{
+	u_char *ebr;
+	struct dos_partition *dp;
+	struct part *part, *next;
+	lba_t block;
+	int error;
+
+	ebr = malloc(secsz);
+	if (ebr == NULL)
+		return (ENOMEM);
+	memset(ebr, 0, secsz);
+	le16enc(ebr + DOSMAGICOFFSET, DOSMAGIC);
+
+	error = 0;
+	STAILQ_FOREACH_SAFE(part, &partlist, link, next) {
+		block = part->block - nsecs;
+		dp = (void *)(ebr + DOSPARTOFF);
+		ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect, nsecs);
+		dp->dp_typ = ALIAS_TYPE2INT(part->type);
+		ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect,
+		    part->block + part->size - 1);
+		le32enc(&dp->dp_start, nsecs);
+		le32enc(&dp->dp_size, part->size);
+
+		/* Add link entry */
+		if (next != NULL) {
+			dp++;
+			ebr_chs(&dp->dp_scyl, &dp->dp_shd, &dp->dp_ssect,
+			    next->block - nsecs);
+			dp->dp_typ = DOSPTYP_EXT;
+			ebr_chs(&dp->dp_ecyl, &dp->dp_ehd, &dp->dp_esect,
+			    next->block + next->size - 1);
+			le32enc(&dp->dp_start, next->block - nsecs);
+			le32enc(&dp->dp_size, next->size + nsecs);
+		}
+
+		error = mkimg_seek(fd, block);
+		if (error == 0) {
+			if (write(fd, ebr, secsz) != (ssize_t)secsz)
+				error = errno;
+		}
+		if (error)
+			break;
+
+		memset(ebr + DOSPARTOFF, 0, 2 * DOSPARTSIZE);
+	}
+
+	free(ebr);
+	return (error);
+}
+
+static struct mkimg_scheme ebr_scheme = {
+	.name = "ebr",
+	.description = "Extended Boot Record",
+	.aliases = ebr_aliases,
+	.metadata = ebr_metadata,
+	.write = ebr_write,
+	.nparts = 4096,
+	.maxsecsz = 4096
+};
+
+SCHEME_DEFINE(ebr_scheme);