PGDIR_BITS
#if (MAX_PHYS_ADDRESS_BITS > PGDIR_SHIFT + PGDIR_BITS)
#if (PGDIR_SHIFT + PGDIR_BITS) != 53
#define PTRS_PER_PGD (1UL << PGDIR_BITS)
sllx VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \
sllx VADDR, 64 - (PGDIR_SHIFT + PGDIR_BITS), REG2; \