MMCONF_MASK
base = (tom2 + 2 * MMCONF_UNIT - 1) & MMCONF_MASK;
base = (range[0].start & MMCONF_MASK) - MMCONF_UNIT;
base = (range[hi_mmio_num - 1].end + MMCONF_UNIT) & MMCONF_MASK;
base = (range[i - 1].end + MMCONF_UNIT) & MMCONF_MASK;
val = range[i].start & MMCONF_MASK;
u64 base = val & MMCONF_MASK;