OvmfPkg: raise PcdShellFileOperationSize to 128KB

[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 - 2016, Intel Corporation. All rights reserved.<BR>\r
  Copyright (C) 2013, ARM Ltd.\r
  Copyright (C) 2017, AMD Inc, All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\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
  VirtioPciAllocateSharedPages,         // AllocateSharedPages\r
  VirtioPciFreeSharedPages,             // FreeSharedPages\r
  VirtioPciMapSharedBuffer,             // MapSharedBuffer\r
  VirtioPciUnmapSharedBuffer,           // UnmapSharedBuffer\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 Execution 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 (\r
                            Device->PciIo,\r
                            EfiPciIoAttributeOperationEnable,\r
                            (EFI_PCI_IO_ATTRIBUTE_IO |\r
                             EFI_PCI_IO_ATTRIBUTE_BUS_MASTER),\r
                            NULL\r
                            );\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