ofw_claimphys
if (ofw_claimphys(pa, size) == -1) {
systempage.pv_pa = ofw_claimphys(0, PAGE_SIZE, PAGE_SIZE);
pa = ofw_claimphys(0, alloc_size, aligned_size);
static paddr_t ofw_claimphys(paddr_t, psize_t, paddr_t);