_REGION2_SHIFT
#define _REGION2_INDEX (0x7ffUL << _REGION2_SHIFT)
#define _REGION2_SIZE (1UL << _REGION2_SHIFT)
#define P4D_SHIFT _REGION2_SHIFT
table += (address & _REGION2_INDEX) >> _REGION2_SHIFT;
rste += (addr & _REGION2_INDEX) >> _REGION2_SHIFT;