NTSTATUS NTAPI PciGetConfigHandlers ( IN PPCI_FDO_EXTENSION FdoExtension )
Definition at line 224 of file config.c.
{
    PBUS_HANDLER BusHandler;
    NTSTATUS Status;
    ASSERT(FdoExtension->BusHandler == NULL);

    /* Check if this is the FDO for the root bus */
    if (PCI_IS_ROOT_FDO(FdoExtension))
    {
        /* Query the PCI Bus Interface that ACPI exposes */
        ASSERT(FdoExtension->PciBusInterface == NULL);
        Status = PciQueryForPciBusInterface(FdoExtension);
        if (!NT_SUCCESS(Status))
        {
            /* No ACPI, so Bus Numbers should be maintained by BIOS */
            ASSERT(!PciAssignBusNumbers);
        }
        else
        {
            /* ACPI detected, PCI Bus Driver will reconfigure bus numbers*/
            PciAssignBusNumbers = TRUE;
        }
    }
    else
    {
        /* Check if the root bus already has the interface set up */
        if (FdoExtension->BusRootFdoExtension->PciBusInterface)
        {
            /* Nothing for this FDO to do */
            return STATUS_SUCCESS;
        }

        /* Fail into case below so we can query the HAL interface */
        Status = STATUS_NOT_SUPPORTED;
    }

    /* If the ACPI PCI Bus Interface couldn't be obtained, try the HAL */
    if (!NT_SUCCESS(Status))
    {
        /* Bus number assignment should be static */
        ASSERT(Status == STATUS_NOT_SUPPORTED);
        ASSERT(!PciAssignBusNumbers);

        /* Call the HAL to obtain the bus handler for PCI */
        BusHandler = HalReferenceHandlerForBus(PCIBus, FdoExtension->BaseBus);
        FdoExtension->BusHandler = BusHandler;

        /* Fail if the HAL does not have a PCI Bus Handler for this bus */
        if (!BusHandler) return STATUS_INVALID_DEVICE_REQUEST;
    }

    /* Appropriate interface was obtained */
    return STATUS_SUCCESS;
}
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