@"Buses & Interconnects"
@(parent := hal)
def bus_if():
    """ System/platform bus interface """

    @"PCI"
    def pci_enable() -> bool:
        """ Peripheral Component Interconnect (PCI) Bus """
        return True

    @"PCI Express"
    def pcie_ext() -> bool:
        """ Enable support of PCI-Express extension """
        require (pci_enable)

        return False

    @"Use PMIO for PCI"
    def pci_pmio() -> bool:
        """ Use port-mapped I/O interface for controlling PCI """
        require (not pcie_ext and pci_enable)
        require (arch_x86)

        return True