PDIR_L1_L
#define PDIR_L1_NUM (PDIR_L1_H-PDIR_L1_L+1)
#define PDIR_L1_SIZE (1 << PDIR_L1_L) /* va range mapped by pdir */
#define PDIR_L1_SHIFT PDIR_L1_L
#define PDIR_H (PDIR_L1_L-1)