--- old/src/share/vm/memory/cardTableModRefBS.hpp	2013-09-09 10:14:28.933421461 +0200
+++ new/src/share/vm/memory/cardTableModRefBS.hpp	2013-09-09 10:14:28.837419696 +0200
@@ -69,7 +69,8 @@
     claimed_card                =  2,
     deferred_card               =  4,
     last_card                   =  8,
-    CT_MR_BS_last_reserved      = 16
+    CT_MR_BS_last_reserved      = 16,
+    g1_young_gen                = 32
   };
 
   // a word's worth (row) of clean card values
@@ -273,6 +274,7 @@
   static int claimed_card_val()    { return claimed_card; }
   static int precleaned_card_val() { return precleaned_card; }
   static int deferred_card_val()   { return deferred_card; }
+  static int g1_young_card_val()   { return g1_young_gen; }
 
   // For RTTI simulation.
   bool is_a(BarrierSet::Name bsn) {
@@ -478,6 +480,7 @@
   void verify_region(MemRegion mr, jbyte val, bool val_equals) PRODUCT_RETURN;
   void verify_not_dirty_region(MemRegion mr) PRODUCT_RETURN;
   void verify_dirty_region(MemRegion mr) PRODUCT_RETURN;
+  void verify_g1_young_region(MemRegion mr) PRODUCT_RETURN;
 
   static size_t par_chunk_heapword_alignment() {
     return ParGCCardsPerStrideChunk * card_size_in_words;