Exemple #1
0
EFI_STATUS
PciEnumerator (
  IN EFI_HANDLE                    Controller
  )
/*++

Routine Description:

  This routine is used to enumerate entire pci bus system 
  in a given platform

Arguments:

Returns:

  None

--*/
{
  //
  // This PCI bus driver depends on the legacy BIOS
  // to do the resource allocation
  //
  gFullEnumeration = FALSE;

  return PciEnumeratorLight (Controller) ;
  
}
Exemple #2
0
/**
  Start this driver on ControllerHandle and enumerate Pci bus and start
  all device under PCI bus.

  @param  This                 Protocol instance pointer.
  @param  Controller           Handle of device to bind driver to.
  @param  RemainingDevicePath  Optional parameter use to pick a specific child
                               device to start.

  @retval EFI_SUCCESS          This driver is added to ControllerHandle.
  @retval EFI_ALREADY_STARTED  This driver is already running on ControllerHandle.
  @retval other                This driver does not support this device.

**/
EFI_STATUS
EFIAPI
PciBusDriverBindingStart (
  IN EFI_DRIVER_BINDING_PROTOCOL  *This,
  IN EFI_HANDLE                   Controller,
  IN EFI_DEVICE_PATH_PROTOCOL     *RemainingDevicePath
  )
{
  EFI_STATUS                      Status;
  EFI_DEVICE_PATH_PROTOCOL        *ParentDevicePath;
  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL *PciRootBridgeIo;

  //
  // Initialize PciRootBridgeIo to suppress incorrect compiler warning.
  //
  PciRootBridgeIo = NULL;

  //
  // Check RemainingDevicePath validation
  //
  if (RemainingDevicePath != NULL) {
    //
    // Check if RemainingDevicePath is the End of Device Path Node,
    // if yes, return EFI_SUCCESS
    //
    if (IsDevicePathEnd (RemainingDevicePath)) {
      return EFI_SUCCESS;
    }
  }

  gBS->LocateProtocol (
         &gEfiIncompatiblePciDeviceSupportProtocolGuid,
         NULL,
         (VOID **) &gIncompatiblePciDeviceSupport
         );

  //
  // If PCI Platform protocol is available, get it now.
  // If the platform implements this, it must be installed before BDS phase
  //
  gPciPlatformProtocol = NULL;
  gBS->LocateProtocol (
        &gEfiPciPlatformProtocolGuid,
        NULL,
        (VOID **) &gPciPlatformProtocol
        );

  //
  // If PCI Platform protocol doesn't exist, try to Pci Override Protocol.
  //
  if (gPciPlatformProtocol == NULL) {
    gPciOverrideProtocol = NULL;
    gBS->LocateProtocol (
          &gEfiPciOverrideProtocolGuid,
          NULL,
          (VOID **) &gPciOverrideProtocol
          );
  }

  if (mIoMmuProtocol == NULL) {
    gBS->LocateProtocol (
          &gEdkiiIoMmuProtocolGuid,
          NULL,
          (VOID **) &mIoMmuProtocol
          );
  }

  if (PcdGetBool (PcdPciDisableBusEnumeration)) {
    gFullEnumeration = FALSE;
  } else {
    gFullEnumeration = (BOOLEAN) ((SearchHostBridgeHandle (Controller) ? FALSE : TRUE));
  }

  //
  // Open Device Path Protocol for PCI root bridge
  //
  Status = gBS->OpenProtocol (
                  Controller,
                  &gEfiDevicePathProtocolGuid,
                  (VOID **) &ParentDevicePath,
                  This->DriverBindingHandle,
                  Controller,
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL
                  );
  ASSERT_EFI_ERROR (Status);

  //
  // Report Status Code to indicate PCI bus starts
  //
  REPORT_STATUS_CODE_WITH_DEVICE_PATH (
    EFI_PROGRESS_CODE,
    (EFI_IO_BUS_PCI | EFI_IOB_PC_INIT),
    ParentDevicePath
    );

  Status = EFI_SUCCESS;
  //
  // Enumerate the entire host bridge
  // After enumeration, a database that records all the device information will be created
  //
  //
  if (gFullEnumeration) {
    //
    // Get the rootbridge Io protocol to find the host bridge handle
    //
    Status = gBS->OpenProtocol (
                    Controller,
                    &gEfiPciRootBridgeIoProtocolGuid,
                    (VOID **) &PciRootBridgeIo,
                    gPciBusDriverBinding.DriverBindingHandle,
                    Controller,
                    EFI_OPEN_PROTOCOL_GET_PROTOCOL
                    );

    if (!EFI_ERROR (Status)) {
      Status = PciEnumerator (Controller, PciRootBridgeIo->ParentHandle);
    }
  } else {
    //
    // If PCI bus has already done the full enumeration, never do it again
    //
    Status = PciEnumeratorLight (Controller);
  }

  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Start all the devices under the entire host bridge.
  //
  StartPciDevices (Controller);

  if (gFullEnumeration) {
    gFullEnumeration = FALSE;

    Status = gBS->InstallProtocolInterface (
                    &PciRootBridgeIo->ParentHandle,
                    &gEfiPciEnumerationCompleteProtocolGuid,
                    EFI_NATIVE_INTERFACE,
                    NULL
                    );
    ASSERT_EFI_ERROR (Status);
  }

  return Status;
}