PCI_GET_MP_PFN1
pfn = PCI_GET_MP_PFN1(mp, start_idx);
pfn = bypass_pfn | PCI_GET_MP_PFN1(mp, i);
iopfn_t pfn = PCI_GET_MP_PFN1(mp, i);
(iopfn_t)(mp)->dmai_pfnlst : PCI_GET_MP_PFN1(mp, page_no))