PCI_HTCAP_MSIMAP_ENABLE
reg |= PCI_HTCAP_MSIMAP_ENABLE;
PCI_HTCAP_MSIMAP_TYPE | PCI_HTCAP_MSIMAP_ENABLE, &ptr) !=
reg &= ~(uint16_t)PCI_HTCAP_MSIMAP_ENABLE;