bootmem_alloc_region
if (bootmem_alloc_region(pa, size) != 0) {
if (bootmem_alloc_region(ekern, maxp - ekern) != 0) {
if (bootmem_alloc_region(maxp, bsize) != 0) {
if (bootmem_alloc_region(maxp, size) != 0) {
int bootmem_alloc_region(paddr_t, size_t);
if (bootmem_alloc_region(ptoa(fp), ptoa(lp) - ptoa(fp)) != 0)