L2_BUCKET_LOG2
#define L2_IDX(l1slot) (L2_BUCKET_IDX(l1slot) >> L2_BUCKET_LOG2)
#define L2_BUCKET_SIZE (1 << L2_BUCKET_LOG2)
#define L2_LOG2 (32 - (L2_BUCKET_XLOG2 + L2_BUCKET_LOG2))