diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index c31560395..f8b25c60d 100644
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -1,3 +1,8 @@
+2013-01-10  Peter Bergner <bergner@vnet.ibm.com>
+
+	* ppc.h (PPC_OPCODE_POWER8): New define.
+	(PPC_OPCODE_HTM): Likewise.
+
 2013-01-10  Will Newton <will.newton@imgtec.com>
 
 	* metag.h: New file.
diff --git a/include/opcode/ppc.h b/include/opcode/ppc.h
index e57b118b0..df9713023 100644
--- a/include/opcode/ppc.h
+++ b/include/opcode/ppc.h
@@ -188,6 +188,14 @@ extern const int vle_num_opcodes;
 /* Opcode which is supported by the VLE extension.  */
 #define PPC_OPCODE_VLE	      0x1000000000ull
 
+/* Opcode is only supported by Power8 architecture.  */
+#define PPC_OPCODE_POWER8     0x2000000000ull
+
+/* Opcode which is supported by the Hardware Transactional Memory extension.  */
+/* Currently, this is the same as the POWER8 mask.  If another cpu comes out
+   that isn't a superset of POWER8, we can define this to its own mask.  */
+#define PPC_OPCODE_HTM        PPC_OPCODE_POWER8
+
 /* A macro to extract the major opcode from an instruction.  */
 #define PPC_OP(i) (((i) >> 26) & 0x3f)