diff --git a/target/mips/internal.h b/target/mips/internal.h
index 76b7a85cbb..bcd3d857ab 100644
--- a/target/mips/internal.h
+++ b/target/mips/internal.h
@@ -16,10 +16,11 @@
  * CP0C0_MT field.
  */
 enum mips_mmu_types {
-    MMU_TYPE_NONE,
-    MMU_TYPE_R4000,
-    MMU_TYPE_RESERVED,
-    MMU_TYPE_FMT,
+    MMU_TYPE_NONE       = 0,
+    MMU_TYPE_R4000      = 1,    /* Standard TLB */
+    MMU_TYPE_BAT        = 2,    /* Block Address Translation */
+    MMU_TYPE_FMT        = 3,    /* Fixed Mapping */
+    MMU_TYPE_DVF        = 4,    /* Dual VTLB and FTLB */
     MMU_TYPE_R3000,
     MMU_TYPE_R6000,
     MMU_TYPE_R8000