OvmfPkg: VIRTIO_DEVICE_PROTOCOL: remove GetQueueAddress() member

[mirror_edk2.git] / OvmfPkg / VirtioPciDeviceDxe / VirtioPciDevice.c

/** @file\r
\r
  This driver produces Virtio Device Protocol instances for Virtio PCI devices.\r
\r
  Copyright (C) 2012, Red Hat, Inc.\r
  Copyright (c) 2012, Intel Corporation. All rights reserved.<BR>\r
  Copyright (C) 2013, ARM Ltd.\r
\r
  This program and the accompanying materials are licensed and made available\r
  under the terms and conditions of the BSD License which accompanies this\r
  distribution. The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r
  WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <IndustryStandard/Pci.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/MemoryAllocationLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/UefiLib.h>\r
\r
#include "VirtioPciDevice.h"\r
\r
STATIC VIRTIO_DEVICE_PROTOCOL mDeviceProtocolTemplate = {\r
  0,                                    // Revision\r
  0,                                    // SubSystemDeviceId\r
  VirtioPciGetDeviceFeatures,           // GetDeviceFeatures\r
  VirtioPciSetGuestFeatures,            // SetGuestFeatures\r
  VirtioPciSetQueueAddress,             // SetQueueAddress\r
  VirtioPciSetQueueSel,                 // SetQueueSel\r
  VirtioPciSetQueueNotify,              // SetQueueNotify\r
  VirtioPciSetQueueAlignment,           // SetQueueAlignment\r
  VirtioPciSetPageSize,                 // SetPageSize\r
  VirtioPciGetQueueSize,                // GetQueueNumMax\r
  VirtioPciSetQueueSize,                // SetQueueNum\r
  VirtioPciGetDeviceStatus,             // GetDeviceStatus\r
  VirtioPciSetDeviceStatus,             // SetDeviceStatus\r
  VirtioPciDeviceWrite,                 // WriteDevice\r
  VirtioPciDeviceRead                   // ReadDevice\r
};\r
\r
/**\r
\r
  Read a word from Region 0 of the device specified by PciIo.\r
\r
  Region 0 must be an iomem region. This is an internal function for the PCI\r
  implementation of the protocol.\r
\r
  @param[in] Dev          Virtio PCI device.\r
\r
  @param[in] FieldOffset  Source offset.\r
\r
  @param[in] FieldSize    Source field size, must be in { 1, 2, 4, 8 }.\r
\r
  @param[in] BufferSize   Number of bytes available in the target buffer. Must\r
                          equal FieldSize.\r
\r
  @param[out] Buffer      Target buffer.\r
\r
\r
  @return  Status code returned by PciIo->Io.Read().\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
VirtioPciIoRead (\r
  IN  VIRTIO_PCI_DEVICE         *Dev,\r
  IN  UINTN                     FieldOffset,\r
  IN  UINTN                     FieldSize,\r
  IN  UINTN                     BufferSize,\r
  OUT VOID                      *Buffer\r
  )\r
{\r
  UINTN                     Count;\r
  EFI_PCI_IO_PROTOCOL_WIDTH Width;\r
  EFI_PCI_IO_PROTOCOL       *PciIo;\r
\r
  ASSERT (FieldSize == BufferSize);\r
\r
  PciIo = Dev->PciIo;\r
  Count = 1;\r
\r
  switch (FieldSize) {\r
    case 1:\r
      Width = EfiPciIoWidthUint8;\r
      break;\r
\r
    case 2:\r
      Width = EfiPciIoWidthUint16;\r
      break;\r
\r
    case 8:\r
      //\r
      // The 64bit PCI I/O is broken down into two 32bit reads to prevent\r
      // any alignment or width issues.\r
      // The UEFI spec says under EFI_PCI_IO_PROTOCOL.Io.Write():\r
      //\r
      // The I/O operations are carried out exactly as requested. The caller\r
      // is responsible for any alignment and I/O width issues which the\r
      // bus, device, platform, or type of I/O might require. For example on\r
      // some platforms, width requests of EfiPciIoWidthUint64 do not work.\r
      //\r
      Count = 2;\r
\r
      //\r
      // fall through\r
      //\r
    case 4:\r
      Width = EfiPciIoWidthUint32;\r
      break;\r
\r
    default:\r
      ASSERT (FALSE);\r
      return EFI_INVALID_PARAMETER;\r
  }\r
\r
  return PciIo->Io.Read (\r
                     PciIo,\r
                     Width,\r
                     PCI_BAR_IDX0,\r
                     FieldOffset,\r
                     Count,\r
                     Buffer\r
                     );\r
}\r
\r
/**\r
\r
  Write a word into Region 0 of the device specified by PciIo.\r
\r
  Region 0 must be an iomem region. This is an internal function for the PCI\r
  implementation of the protocol.\r
\r
  @param[in] Dev          Virtio PCI device.\r
\r
  @param[in] FieldOffset  Destination offset.\r
\r
  @param[in] FieldSize    Destination field size, must be in { 1, 2, 4, 8 }.\r
\r
  @param[in] Value        Little endian value to write, converted to UINT64.\r
                          The least significant FieldSize bytes will be used.\r
\r
\r
  @return  Status code returned by PciIo->Io.Write().\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
VirtioPciIoWrite (\r
  IN  VIRTIO_PCI_DEVICE         *Dev,\r
  IN UINTN                      FieldOffset,\r
  IN UINTN                      FieldSize,\r
  IN UINT64                     Value\r
  )\r
{\r
  UINTN                     Count;\r
  EFI_PCI_IO_PROTOCOL_WIDTH Width;\r
  EFI_PCI_IO_PROTOCOL       *PciIo;\r
\r
  PciIo = Dev->PciIo;\r
  Count = 1;\r
\r
  switch (FieldSize) {\r
    case 1:\r
      Width = EfiPciIoWidthUint8;\r
      break;\r
\r
    case 2:\r
      Width = EfiPciIoWidthUint16;\r
      break;\r
\r
    case 8:\r
      //\r
      // The 64bit PCI I/O is broken down into two 32bit writes to prevent\r
      // any alignment or width issues.\r
      // The UEFI spec says under EFI_PCI_IO_PROTOCOL.Io.Write():\r
      //\r
      // The I/O operations are carried out exactly as requested. The caller\r
      // is responsible for any alignment and I/O width issues which the\r
      // bus, device, platform, or type of I/O might require. For example on\r
      // some platforms, width requests of EfiPciIoWidthUint64 do not work\r
      //\r
      Count = Count * 2;\r
\r
      //\r
      // fall through\r
      //\r
    case 4:\r
      Width = EfiPciIoWidthUint32;\r
      break;\r
\r
    default:\r
      ASSERT (FALSE);\r
      return EFI_INVALID_PARAMETER;\r
  }\r
\r
  return PciIo->Io.Write (\r
                     PciIo,\r
                     Width,\r
                     PCI_BAR_IDX0,\r
                     FieldOffset,\r
                     Count,\r
                     &Value\r
                     );\r
}\r
\r
/**\r
\r
  Device probe function for this driver.\r
\r
  The DXE core calls this function for any given device in order to see if the\r
  driver can drive the device.\r
\r
  @param[in]  This                The EFI_DRIVER_BINDING_PROTOCOL object\r
                                  incorporating this driver (independently of\r
                                  any device).\r
\r
  @param[in] DeviceHandle         The device to probe.\r
\r
  @param[in] RemainingDevicePath  Relevant only for bus drivers, ignored.\r
\r
\r
  @retval EFI_SUCCESS      The driver supports the device being probed.\r
\r
  @retval EFI_UNSUPPORTED  Based on virtio-pci discovery, we do not support\r
                           the device.\r
\r
  @return                  Error codes from the OpenProtocol() boot service or\r
                           the PciIo protocol.\r
\r
**/\r
STATIC\r
EFI_STATUS\r
EFIAPI\r
VirtioPciDeviceBindingSupported (\r
  IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
  IN EFI_HANDLE                  DeviceHandle,\r
  IN EFI_DEVICE_PATH_PROTOCOL    *RemainingDevicePath\r
  )\r
{\r
  EFI_STATUS          Status;\r
  EFI_PCI_IO_PROTOCOL *PciIo;\r
  PCI_TYPE00          Pci;\r
\r
  //\r
  // Attempt to open the device with the PciIo set of interfaces. On success,\r
  // the protocol is "instantiated" for the PCI device. Covers duplicate open\r
  // attempts (EFI_ALREADY_STARTED).\r
  //\r
  Status = gBS->OpenProtocol (\r
                  DeviceHandle,               // candidate device\r
                  &gEfiPciIoProtocolGuid,     // for generic PCI access\r
                  (VOID **)&PciIo,            // handle to instantiate\r
                  This->DriverBindingHandle,  // requestor driver identity\r
                  DeviceHandle,               // ControllerHandle, according to\r
                                              // the UEFI Driver Model\r
                  EFI_OPEN_PROTOCOL_BY_DRIVER // get exclusive PciIo access to\r
                                              // the device; to be released\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Read entire PCI configuration header for more extensive check ahead.\r
  //\r
  Status = PciIo->Pci.Read (\r
                        PciIo,                        // (protocol, device)\r
                                                      // handle\r
                        EfiPciIoWidthUint32,          // access width & copy\r
                                                      // mode\r
                        0,                            // Offset\r
                        sizeof Pci / sizeof (UINT32), // Count\r
                        &Pci                          // target buffer\r
                        );\r
\r
  if (Status == EFI_SUCCESS) {\r
    //\r
    // virtio-0.9.5, 2.1 PCI Discovery\r
    //\r
    if ((Pci.Hdr.VendorId == VIRTIO_VENDOR_ID) &&\r
        (Pci.Hdr.DeviceId >= 0x1000) &&\r
        (Pci.Hdr.DeviceId <= 0x103F) &&\r
        (Pci.Hdr.RevisionID == 0x00)) {\r
      Status = EFI_SUCCESS;\r
    } else {\r
      Status = EFI_UNSUPPORTED;\r
    }\r
  }\r
\r
  //\r
  // We needed PCI IO access only transitorily, to see whether we support the\r
  // device or not.\r
  //\r
  gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r
         This->DriverBindingHandle, DeviceHandle);\r
\r
  return Status;\r
}\r
\r
/**\r
\r
  Initialize the VirtIo PCI Device\r
\r
  @param[in, out] Dev      The driver instance to configure. The caller is\r
                           responsible for Device->PciIo's validity (ie. working IO\r
                           access to the underlying virtio-pci device).\r
\r
  @retval EFI_SUCCESS      Setup complete.\r
\r
  @retval EFI_UNSUPPORTED  The underlying IO device doesn't support the\r
                           provided address offset and read size.\r
\r
  @return                  Error codes from PciIo->Pci.Read().\r
\r
**/\r
STATIC\r
EFI_STATUS\r
EFIAPI\r
VirtioPciInit (\r
  IN OUT VIRTIO_PCI_DEVICE *Device\r
  )\r
{\r
  EFI_STATUS            Status;\r
  EFI_PCI_IO_PROTOCOL   *PciIo;\r
  PCI_TYPE00            Pci;\r
\r
  ASSERT (Device != NULL);\r
  PciIo = Device->PciIo;\r
  ASSERT (PciIo != NULL);\r
  ASSERT (PciIo->Pci.Read != NULL);\r
\r
  Status = PciIo->Pci.Read (\r
                        PciIo,                        // (protocol, device)\r
                                                      // handle\r
                        EfiPciIoWidthUint32,          // access width & copy\r
                                                      // mode\r
                        0,                            // Offset\r
                        sizeof (Pci) / sizeof (UINT32), // Count\r
                        &Pci                          // target buffer\r
                        );\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  //\r
  // Copy protocol template\r
  //\r
  CopyMem (&Device->VirtioDevice, &mDeviceProtocolTemplate,\r
      sizeof (VIRTIO_DEVICE_PROTOCOL));\r
\r
  //\r
  // Initialize the protocol interface attributes\r
  //\r
  Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (0, 9, 5);\r
  Device->VirtioDevice.SubSystemDeviceId = Pci.Device.SubsystemID;\r
\r
  //\r
  // Note: We don't support the MSI-X capability.  If we did,\r
  //       the offset would become 24 after enabling MSI-X.\r
  //\r
  Device->DeviceSpecificConfigurationOffset =\r
      VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_PCI;\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
\r
  Uninitialize the internals of a virtio-pci device that has been successfully\r
  set up with VirtioPciInit().\r
\r
  @param[in, out]  Dev  The device to clean up.\r
\r
**/\r
\r
STATIC\r
VOID\r
EFIAPI\r
VirtioPciUninit (\r
  IN OUT VIRTIO_PCI_DEVICE *Device\r
  )\r
{\r
  // Note: This function mirrors VirtioPciInit() that does not allocate any\r
  //       resources - there's nothing to free here.\r
}\r
\r
/**\r
\r
  After we've pronounced support for a specific device in\r
  DriverBindingSupported(), we start managing said device (passed in by the\r
  Driver Exeuction Environment) with the following service.\r
\r
  See DriverBindingSupported() for specification references.\r
\r
  @param[in]  This                The EFI_DRIVER_BINDING_PROTOCOL object\r
                                  incorporating this driver (independently of\r
                                  any device).\r
\r
  @param[in] DeviceHandle         The supported device to drive.\r
\r
  @param[in] RemainingDevicePath  Relevant only for bus drivers, ignored.\r
\r
\r
  @retval EFI_SUCCESS           Driver instance has been created and\r
                                initialized  for the virtio-pci device, it\r
                                is now accessible via VIRTIO_DEVICE_PROTOCOL.\r
\r
  @retval EFI_OUT_OF_RESOURCES  Memory allocation failed.\r
\r
  @return                       Error codes from the OpenProtocol() boot\r
                                service, the PciIo protocol, VirtioPciInit(),\r
                                or the InstallProtocolInterface() boot service.\r
\r
**/\r
STATIC\r
EFI_STATUS\r
EFIAPI\r
VirtioPciDeviceBindingStart (\r
  IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
  IN EFI_HANDLE                  DeviceHandle,\r
  IN EFI_DEVICE_PATH_PROTOCOL    *RemainingDevicePath\r
  )\r
{\r
  VIRTIO_PCI_DEVICE   *Device;\r
  EFI_STATUS           Status;\r
\r
  Device = (VIRTIO_PCI_DEVICE *) AllocateZeroPool (sizeof *Device);\r
  if (Device == NULL) {\r
    return EFI_OUT_OF_RESOURCES;\r
  }\r
\r
  Status = gBS->OpenProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r
                  (VOID **)&Device->PciIo, This->DriverBindingHandle,\r
                  DeviceHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);\r
  if (EFI_ERROR (Status)) {\r
    goto FreeVirtioPci;\r
  }\r
\r
  //\r
  // We must retain and ultimately restore the original PCI attributes of the\r
  // device. See Driver Writer's Guide for UEFI 2.3.1 v1.01, 18.3 PCI drivers /\r
  // 18.3.2 Start() and Stop().\r
  //\r
  // The third parameter ("Attributes", input) is ignored by the Get operation.\r
  // The fourth parameter ("Result", output) is ignored by the Enable and Set\r
  // operations.\r
  //\r
  // For virtio-pci we only need IO space access.\r
  //\r
  Status = Device->PciIo->Attributes (Device->PciIo,\r
      EfiPciIoAttributeOperationGet, 0, &Device->OriginalPciAttributes);\r
  if (EFI_ERROR (Status)) {\r
    goto ClosePciIo;\r
  }\r
\r
  Status = Device->PciIo->Attributes (Device->PciIo,\r
                         EfiPciIoAttributeOperationEnable,\r
                         EFI_PCI_IO_ATTRIBUTE_IO, NULL);\r
  if (EFI_ERROR (Status)) {\r
    goto ClosePciIo;\r
  }\r
\r
  //\r
  // PCI IO access granted, configure protocol instance\r
  //\r
\r
  Status = VirtioPciInit (Device);\r
  if (EFI_ERROR (Status)) {\r
    goto RestorePciAttributes;\r
  }\r
\r
  //\r
  // Setup complete, attempt to export the driver instance's VirtioDevice\r
  // interface.\r
  //\r
  Device->Signature = VIRTIO_PCI_DEVICE_SIGNATURE;\r
  Status = gBS->InstallProtocolInterface (&DeviceHandle,\r
                  &gVirtioDeviceProtocolGuid, EFI_NATIVE_INTERFACE,\r
                  &Device->VirtioDevice);\r
  if (EFI_ERROR (Status)) {\r
    goto UninitDev;\r
  }\r
\r
  return EFI_SUCCESS;\r
\r
UninitDev:\r
  VirtioPciUninit (Device);\r
\r
RestorePciAttributes:\r
  Device->PciIo->Attributes (Device->PciIo, EfiPciIoAttributeOperationSet,\r
                Device->OriginalPciAttributes, NULL);\r
\r
ClosePciIo:\r
  gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r
         This->DriverBindingHandle, DeviceHandle);\r
\r
FreeVirtioPci:\r
  FreePool (Device);\r
\r
  return Status;\r
}\r
\r
/**\r
\r
  Stop driving the Virtio PCI device\r
\r
  @param[in] This               The EFI_DRIVER_BINDING_PROTOCOL object\r
                                incorporating this driver (independently of any\r
                                device).\r
\r
  @param[in] DeviceHandle       Stop driving this device.\r
\r
  @param[in] NumberOfChildren   Since this function belongs to a device driver\r
                                only (as opposed to a bus driver), the caller\r
                                environment sets NumberOfChildren to zero, and\r
                                we ignore it.\r
\r
  @param[in] ChildHandleBuffer  Ignored (corresponding to NumberOfChildren).\r
\r
  @retval EFI_SUCCESS           Driver instance has been stopped and the PCI\r
                                configuration attributes have been restored.\r
\r
  @return                       Error codes from the OpenProtocol() or\r
                                CloseProtocol(), UninstallProtocolInterface()\r
                                boot services.\r
\r
**/\r
STATIC\r
EFI_STATUS\r
EFIAPI\r
VirtioPciDeviceBindingStop (\r
  IN EFI_DRIVER_BINDING_PROTOCOL *This,\r
  IN EFI_HANDLE                  DeviceHandle,\r
  IN UINTN                       NumberOfChildren,\r
  IN EFI_HANDLE                  *ChildHandleBuffer\r
  )\r
{\r
  EFI_STATUS               Status;\r
  VIRTIO_DEVICE_PROTOCOL  *VirtioDevice;\r
  VIRTIO_PCI_DEVICE       *Device;\r
\r
  Status = gBS->OpenProtocol (\r
                  DeviceHandle,                  // candidate device\r
                  &gVirtioDeviceProtocolGuid,    // retrieve the VirtIo iface\r
                  (VOID **)&VirtioDevice,        // target pointer\r
                  This->DriverBindingHandle,     // requestor driver identity\r
                  DeviceHandle,                  // requesting lookup for dev.\r
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL // lookup only, no ref. added\r
                  );\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  Device = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (VirtioDevice);\r
\r
  //\r
  // Handle Stop() requests for in-use driver instances gracefully.\r
  //\r
  Status = gBS->UninstallProtocolInterface (DeviceHandle,\r
                  &gVirtioDeviceProtocolGuid, &Device->VirtioDevice);\r
  if (EFI_ERROR (Status)) {\r
    return Status;\r
  }\r
\r
  VirtioPciUninit (Device);\r
\r
  Device->PciIo->Attributes (Device->PciIo, EfiPciIoAttributeOperationSet,\r
                Device->OriginalPciAttributes, NULL);\r
\r
  Status = gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,\r
         This->DriverBindingHandle, DeviceHandle);\r
\r
  FreePool (Device);\r
\r
  return Status;\r
}\r
\r
\r
//\r
// The static object that groups the Supported() (ie. probe), Start() and\r
// Stop() functions of the driver together. Refer to UEFI Spec 2.3.1 + Errata\r
// C, 10.1 EFI Driver Binding Protocol.\r
//\r
STATIC EFI_DRIVER_BINDING_PROTOCOL gDriverBinding = {\r
  &VirtioPciDeviceBindingSupported,\r
  &VirtioPciDeviceBindingStart,\r
  &VirtioPciDeviceBindingStop,\r
  0x10, // Version, must be in [0x10 .. 0xFFFFFFEF] for IHV-developed drivers\r
  NULL, // ImageHandle, to be overwritten by\r
        // EfiLibInstallDriverBindingComponentName2() in VirtioPciEntryPoint()\r
  NULL  // DriverBindingHandle, ditto\r
};\r
\r
\r
//\r
// The purpose of the following scaffolding (EFI_COMPONENT_NAME_PROTOCOL and\r
// EFI_COMPONENT_NAME2_PROTOCOL implementation) is to format the driver's name\r
// in English, for display on standard console devices. This is recommended for\r
// UEFI drivers that follow the UEFI Driver Model. Refer to the Driver Writer's\r
// Guide for UEFI 2.3.1 v1.01, 11 UEFI Driver and Controller Names.\r
//\r
STATIC\r
EFI_UNICODE_STRING_TABLE mDriverNameTable[] = {\r
  { "eng;en", L"Virtio PCI Driver" },\r
  { NULL,     NULL                   }\r
};\r
\r
STATIC\r
EFI_COMPONENT_NAME_PROTOCOL gComponentName;\r
\r
EFI_STATUS\r
EFIAPI\r
VirtioPciGetDriverName (\r
  IN  EFI_COMPONENT_NAME_PROTOCOL *This,\r
  IN  CHAR8                       *Language,\r
  OUT CHAR16                      **DriverName\r
  )\r
{\r
  return LookupUnicodeString2 (\r
           Language,\r
           This->SupportedLanguages,\r
           mDriverNameTable,\r
           DriverName,\r
           (BOOLEAN)(This == &gComponentName) // Iso639Language\r
           );\r
}\r
\r
EFI_STATUS\r
EFIAPI\r
VirtioPciGetDeviceName (\r
  IN  EFI_COMPONENT_NAME_PROTOCOL *This,\r
  IN  EFI_HANDLE                  DeviceHandle,\r
  IN  EFI_HANDLE                  ChildHandle,\r
  IN  CHAR8                       *Language,\r
  OUT CHAR16                      **ControllerName\r
  )\r
{\r
  return EFI_UNSUPPORTED;\r
}\r
\r
STATIC\r
EFI_COMPONENT_NAME_PROTOCOL gComponentName = {\r
  &VirtioPciGetDriverName,\r
  &VirtioPciGetDeviceName,\r
  "eng" // SupportedLanguages, ISO 639-2 language codes\r
};\r
\r
STATIC\r
EFI_COMPONENT_NAME2_PROTOCOL gComponentName2 = {\r
  (EFI_COMPONENT_NAME2_GET_DRIVER_NAME)     &VirtioPciGetDriverName,\r
  (EFI_COMPONENT_NAME2_GET_CONTROLLER_NAME) &VirtioPciGetDeviceName,\r
  "en" // SupportedLanguages, RFC 4646 language codes\r
};\r
\r
\r
//\r
// Entry point of this driver.\r
//\r
EFI_STATUS\r
EFIAPI\r
VirtioPciDeviceEntryPoint (\r
  IN EFI_HANDLE       ImageHandle,\r
  IN EFI_SYSTEM_TABLE *SystemTable\r
  )\r
{\r
  return EfiLibInstallDriverBindingComponentName2 (\r
           ImageHandle,\r
           SystemTable,\r
           &gDriverBinding,\r
           ImageHandle,\r
           &gComponentName,\r
           &gComponentName2\r
           );\r
}\r