ldc_map_slot
size = roundup(nentries * sizeof(struct ldc_map_slot), PAGE_SIZE);
lm->lm_slot = (struct ldc_map_slot *)va;
bzero(lm->lm_slot, nentries * sizeof(struct ldc_map_slot));
size = lm->lm_nentries * sizeof(struct ldc_map_slot);
struct ldc_map_slot *lm_slot;