Add disklabel64 support to GEOM_PART class.

This partitioning scheme is used in DragonFlyBSD. It is similar to
BSD disklabel, but has the following improvements:
* metadata has own dedicated place and isn't accessible through partitions;
* all offsets are 64-bit;
* supports 16 partitions by default (has reserved place for more);
* has reserved place for backup label (but not yet implemented);
* has UUIDs for partitions and partition types;

No objections from:	geom
MFC after:	2 weeks
Relnotes:	yes

2 files changed, 13 insertions, 0 deletions

diff --git a/sys/modules/geom/geom_part/Makefile b/sys/modules/geom/geom_part/Makefile
index b198bb8aed18..aa6059c3ba82 100644
--- a/sys/modules/geom/geom_part/Makefile
+++ b/sys/modules/geom/geom_part/Makefile
@@ -2,6 +2,7 @@
 
 SUBDIR=	geom_part_apm \
 	geom_part_bsd \
+	geom_part_bsd64 \
 	geom_part_ebr \
 	geom_part_gpt \
 	geom_part_ldm \
diff --git a/sys/modules/geom/geom_part/geom_part_bsd64/Makefile b/sys/modules/geom/geom_part/geom_part_bsd64/Makefile
new file mode 100644
index 000000000000..bc1bb55b5fd3
--- /dev/null
+++ b/sys/modules/geom/geom_part/geom_part_bsd64/Makefile
@@ -0,0 +1,12 @@
+# $FreeBSD$
+
+.PATH: ${.CURDIR}/../../../../geom/part
+
+KMOD=	geom_part_bsd64
+SRCS=	g_part_bsd64.c
+
+SRCS+=	bus_if.h device_if.h g_part_if.h
+
+MFILES=	kern/bus_if.m kern/device_if.m geom/part/g_part_if.m
+
+.include <bsd.kmod.mk>