KBTOB
if (extent_alloc_region(iomem_ex, 0, KBTOB(biosbasemem), EX_NOWAIT)) {
cluster->size = trunc_page(KBTOB(biosbasemem));
if (extent_alloc_region(iomem_ex, IOM_END, KBTOB(biosextmem),
cluster->size = trunc_page(KBTOB(biosextmem));
avail_end = IOM_END + trunc_page(KBTOB(biosextmem));