PDIR_NENTRIES
#define PMAP_ROOT_SIZE (sizeof(pte_t**) * PDIR_NENTRIES)
for (; i < PDIR_NENTRIES; i++, j = 0) {
pdir_start = kernel_ptbl_root + PDIR_NENTRIES * sizeof(pte_t);
data_end += PDIR_NENTRIES * sizeof(pte_t*);
bzero(pmap->pm_pdir, sizeof(pte_t *) * PDIR_NENTRIES);
for (; k < PDIR_NENTRIES; k++, l = 0) {
k < PDIR_NENTRIES && va < VM_MAX_KERNEL_ADDRESS;
#define PDIR_PAGES ((PDIR_NENTRIES * (1<<PDIR_ENTRY_SHIFT)) / PAGE_SIZE)