summaryrefslogtreecommitdiffstats
path: root/OvmfPkg/VirtioPciDeviceDxe/VirtioPciDevice.c
blob: 2647bd39189bad481cce92cb9782e287cb84c2b1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
/** @file

  This driver produces Virtio Device Protocol instances for Virtio PCI devices.

  Copyright (C) 2012, Red Hat, Inc.
  Copyright (c) 2012, Intel Corporation. All rights reserved.<BR>
  Copyright (C) 2013, ARM Ltd.

  This program and the accompanying materials are licensed and made available
  under the terms and conditions of the BSD License which accompanies this
  distribution. The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
  WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include <IndustryStandard/Pci.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>

#include "VirtioPciDevice.h"

STATIC VIRTIO_DEVICE_PROTOCOL mDeviceProtocolTemplate = {
  0,                                    // Revision
  0,                                    // SubSystemDeviceId
  VirtioPciGetDeviceFeatures,           // GetDeviceFeatures
  VirtioPciSetGuestFeatures,            // SetGuestFeatures
  VirtioPciGetQueueAddress,             // GetQueueAddress
  VirtioPciSetQueueAddress,             // SetQueueAddress
  VirtioPciSetQueueSel,                 // SetQueueSel
  VirtioPciSetQueueNotify,              // SetQueueNotify
  VirtioPciSetQueueAlignment,           // SetQueueAlignment
  VirtioPciSetPageSize,                 // SetPageSize
  VirtioPciGetQueueSize,                // GetQueueNumMax
  VirtioPciSetQueueSize,                // SetQueueNum
  VirtioPciGetDeviceStatus,             // GetDeviceStatus
  VirtioPciSetDeviceStatus,             // SetDeviceStatus
  VirtioPciDeviceWrite,                 // WriteDevice
  VirtioPciDeviceRead                   // ReadDevice
};

/**

  Read a word from Region 0 of the device specified by PciIo.

  Region 0 must be an iomem region. This is an internal function for the PCI
  implementation of the protocol.

  @param[in] Dev          Virtio PCI device.

  @param[in] FieldOffset  Source offset.

  @param[in] FieldSize    Source field size, must be in { 1, 2, 4, 8 }.

  @param[in] BufferSize   Number of bytes available in the target buffer. Must
                          equal FieldSize.

  @param[out] Buffer      Target buffer.


  @return  Status code returned by PciIo->Io.Read().

**/
EFI_STATUS
EFIAPI
VirtioPciIoRead (
  IN  VIRTIO_PCI_DEVICE         *Dev,
  IN  UINTN                     FieldOffset,
  IN  UINTN                     FieldSize,
  IN  UINTN                     BufferSize,
  OUT VOID                      *Buffer
  )
{
  UINTN                     Count;
  EFI_PCI_IO_PROTOCOL_WIDTH Width;
  EFI_PCI_IO_PROTOCOL       *PciIo;

  ASSERT (FieldSize == BufferSize);

  PciIo = Dev->PciIo;
  Count = 1;

  switch (FieldSize) {
    case 1:
      Width = EfiPciIoWidthUint8;
      break;

    case 2:
      Width = EfiPciIoWidthUint16;
      break;

    case 8:
      //
      // The 64bit PCI I/O is broken down into two 32bit reads to prevent
      // any alignment or width issues.
      // The UEFI spec says under EFI_PCI_IO_PROTOCOL.Io.Write():
      //
      // The I/O operations are carried out exactly as requested. The caller
      // is responsible for any alignment and I/O width issues which the
      // bus, device, platform, or type of I/O might require. For example on
      // some platforms, width requests of EfiPciIoWidthUint64 do not work.
      //
      Count = 2;

      //
      // fall through
      //
    case 4:
      Width = EfiPciIoWidthUint32;
      break;

    default:
      ASSERT (FALSE);
      return EFI_INVALID_PARAMETER;
  }

  return PciIo->Io.Read (
                     PciIo,
                     Width,
                     PCI_BAR_IDX0,
                     FieldOffset,
                     Count,
                     Buffer
                     );
}

/**

  Write a word into Region 0 of the device specified by PciIo.

  Region 0 must be an iomem region. This is an internal function for the PCI
  implementation of the protocol.

  @param[in] Dev          Virtio PCI device.

  @param[in] FieldOffset  Destination offset.

  @param[in] FieldSize    Destination field size, must be in { 1, 2, 4, 8 }.

  @param[in] Value        Little endian value to write, converted to UINT64.
                          The least significant FieldSize bytes will be used.


  @return  Status code returned by PciIo->Io.Write().

**/
EFI_STATUS
EFIAPI
VirtioPciIoWrite (
  IN  VIRTIO_PCI_DEVICE         *Dev,
  IN UINTN                      FieldOffset,
  IN UINTN                      FieldSize,
  IN UINT64                     Value
  )
{
  UINTN                     Count;
  EFI_PCI_IO_PROTOCOL_WIDTH Width;
  EFI_PCI_IO_PROTOCOL       *PciIo;

  PciIo = Dev->PciIo;
  Count = 1;

  switch (FieldSize) {
    case 1:
      Width = EfiPciIoWidthUint8;
      break;

    case 2:
      Width = EfiPciIoWidthUint16;
      break;

    case 8:
      //
      // The 64bit PCI I/O is broken down into two 32bit writes to prevent
      // any alignment or width issues.
      // The UEFI spec says under EFI_PCI_IO_PROTOCOL.Io.Write():
      //
      // The I/O operations are carried out exactly as requested. The caller
      // is responsible for any alignment and I/O width issues which the
      // bus, device, platform, or type of I/O might require. For example on
      // some platforms, width requests of EfiPciIoWidthUint64 do not work
      //
      Count = Count * 2;

      //
      // fall through
      //
    case 4:
      Width = EfiPciIoWidthUint32;
      break;

    default:
      ASSERT (FALSE);
      return EFI_INVALID_PARAMETER;
  }

  return PciIo->Io.Write (
                     PciIo,
                     Width,
                     PCI_BAR_IDX0,
                     FieldOffset,
                     Count,
                     &Value
                     );
}

/**

  Device probe function for this driver.

  The DXE core calls this function for any given device in order to see if the
  driver can drive the device.

  @param[in]  This                The EFI_DRIVER_BINDING_PROTOCOL object
                                  incorporating this driver (independently of
                                  any device).

  @param[in] DeviceHandle         The device to probe.

  @param[in] RemainingDevicePath  Relevant only for bus drivers, ignored.


  @retval EFI_SUCCESS      The driver supports the device being probed.

  @retval EFI_UNSUPPORTED  Based on virtio-pci discovery, we do not support
                           the device.

  @return                  Error codes from the OpenProtocol() boot service or
                           the PciIo protocol.

**/
STATIC
EFI_STATUS
EFIAPI
VirtioPciDeviceBindingSupported (
  IN EFI_DRIVER_BINDING_PROTOCOL *This,
  IN EFI_HANDLE                  DeviceHandle,
  IN EFI_DEVICE_PATH_PROTOCOL    *RemainingDevicePath
  )
{
  EFI_STATUS          Status;
  EFI_PCI_IO_PROTOCOL *PciIo;
  PCI_TYPE00          Pci;

  //
  // Attempt to open the device with the PciIo set of interfaces. On success,
  // the protocol is "instantiated" for the PCI device. Covers duplicate open
  // attempts (EFI_ALREADY_STARTED).
  //
  Status = gBS->OpenProtocol (
                  DeviceHandle,               // candidate device
                  &gEfiPciIoProtocolGuid,     // for generic PCI access
                  (VOID **)&PciIo,            // handle to instantiate
                  This->DriverBindingHandle,  // requestor driver identity
                  DeviceHandle,               // ControllerHandle, according to
                                              // the UEFI Driver Model
                  EFI_OPEN_PROTOCOL_BY_DRIVER // get exclusive PciIo access to
                                              // the device; to be released
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Read entire PCI configuration header for more extensive check ahead.
  //
  Status = PciIo->Pci.Read (
                        PciIo,                        // (protocol, device)
                                                      // handle
                        EfiPciIoWidthUint32,          // access width & copy
                                                      // mode
                        0,                            // Offset
                        sizeof Pci / sizeof (UINT32), // Count
                        &Pci                          // target buffer
                        );

  if (Status == EFI_SUCCESS) {
    //
    // virtio-0.9.5, 2.1 PCI Discovery
    //
    if ((Pci.Hdr.VendorId == VIRTIO_VENDOR_ID) &&
        (Pci.Hdr.DeviceId >= 0x1000) &&
        (Pci.Hdr.DeviceId <= 0x103F) &&
        (Pci.Hdr.RevisionID == 0x00)) {
      Status = EFI_SUCCESS;
    } else {
      Status = EFI_UNSUPPORTED;
    }
  }

  //
  // We needed PCI IO access only transitorily, to see whether we support the
  // device or not.
  //
  gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
         This->DriverBindingHandle, DeviceHandle);

  return Status;
}

/**

  Initialize the VirtIo PCI Device

  @param[in, out] Dev      The driver instance to configure. The caller is
                           responsible for Device->PciIo's validity (ie. working IO
                           access to the underlying virtio-pci device).

  @retval EFI_SUCCESS      Setup complete.

  @retval EFI_UNSUPPORTED  The underlying IO device doesn't support the
                           provided address offset and read size.

  @return                  Error codes from PciIo->Pci.Read().

**/
STATIC
EFI_STATUS
EFIAPI
VirtioPciInit (
  IN OUT VIRTIO_PCI_DEVICE *Device
  )
{
  EFI_STATUS            Status;
  EFI_PCI_IO_PROTOCOL   *PciIo;
  PCI_TYPE00            Pci;

  ASSERT (Device != NULL);
  PciIo = Device->PciIo;
  ASSERT (PciIo != NULL);
  ASSERT (PciIo->Pci.Read != NULL);

  Status = PciIo->Pci.Read (
                        PciIo,                        // (protocol, device)
                                                      // handle
                        EfiPciIoWidthUint32,          // access width & copy
                                                      // mode
                        0,                            // Offset
                        sizeof (Pci) / sizeof (UINT32), // Count
                        &Pci                          // target buffer
                        );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Copy protocol template
  //
  CopyMem (&Device->VirtioDevice, &mDeviceProtocolTemplate,
      sizeof (VIRTIO_DEVICE_PROTOCOL));

  //
  // Initialize the protocol interface attributes
  //
  Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (0, 9, 5);
  Device->VirtioDevice.SubSystemDeviceId = Pci.Device.SubsystemID;

  //
  // Note: We don't support the MSI-X capability.  If we did,
  //       the offset would become 24 after enabling MSI-X.
  //
  Device->DeviceSpecificConfigurationOffset =
      VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_PCI;

  return EFI_SUCCESS;
}

/**

  Uninitialize the internals of a virtio-pci device that has been successfully
  set up with VirtioPciInit().

  @param[in, out]  Dev  The device to clean up.

**/

STATIC
VOID
EFIAPI
VirtioPciUninit (
  IN OUT VIRTIO_PCI_DEVICE *Device
  )
{
  // Note: This function mirrors VirtioPciInit() that does not allocate any
  //       resources - there's nothing to free here.
}

/**

  After we've pronounced support for a specific device in
  DriverBindingSupported(), we start managing said device (passed in by the
  Driver Exeuction Environment) with the following service.

  See DriverBindingSupported() for specification references.

  @param[in]  This                The EFI_DRIVER_BINDING_PROTOCOL object
                                  incorporating this driver (independently of
                                  any device).

  @param[in] DeviceHandle         The supported device to drive.

  @param[in] RemainingDevicePath  Relevant only for bus drivers, ignored.


  @retval EFI_SUCCESS           Driver instance has been created and
                                initialized  for the virtio-pci device, it
                                is now accessible via VIRTIO_DEVICE_PROTOCOL.

  @retval EFI_OUT_OF_RESOURCES  Memory allocation failed.

  @return                       Error codes from the OpenProtocol() boot
                                service, the PciIo protocol, VirtioPciInit(),
                                or the InstallProtocolInterface() boot service.

**/
STATIC
EFI_STATUS
EFIAPI
VirtioPciDeviceBindingStart (
  IN EFI_DRIVER_BINDING_PROTOCOL *This,
  IN EFI_HANDLE                  DeviceHandle,
  IN EFI_DEVICE_PATH_PROTOCOL    *RemainingDevicePath
  )
{
  VIRTIO_PCI_DEVICE   *Device;
  EFI_STATUS           Status;

  Device = (VIRTIO_PCI_DEVICE *) AllocateZeroPool (sizeof *Device);
  if (Device == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  Status = gBS->OpenProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
                  (VOID **)&Device->PciIo, This->DriverBindingHandle,
                  DeviceHandle, EFI_OPEN_PROTOCOL_BY_DRIVER);
  if (EFI_ERROR (Status)) {
    goto FreeVirtioPci;
  }

  //
  // We must retain and ultimately restore the original PCI attributes of the
  // device. See Driver Writer's Guide for UEFI 2.3.1 v1.01, 18.3 PCI drivers /
  // 18.3.2 Start() and Stop().
  //
  // The third parameter ("Attributes", input) is ignored by the Get operation.
  // The fourth parameter ("Result", output) is ignored by the Enable and Set
  // operations.
  //
  // For virtio-pci we only need IO space access.
  //
  Status = Device->PciIo->Attributes (Device->PciIo,
      EfiPciIoAttributeOperationGet, 0, &Device->OriginalPciAttributes);
  if (EFI_ERROR (Status)) {
    goto ClosePciIo;
  }

  Status = Device->PciIo->Attributes (Device->PciIo,
                         EfiPciIoAttributeOperationEnable,
                         EFI_PCI_IO_ATTRIBUTE_IO, NULL);
  if (EFI_ERROR (Status)) {
    goto ClosePciIo;
  }

  //
  // PCI IO access granted, configure protocol instance
  //

  Status = VirtioPciInit (Device);
  if (EFI_ERROR (Status)) {
    goto RestorePciAttributes;
  }

  //
  // Setup complete, attempt to export the driver instance's VirtioDevice
  // interface.
  //
  Device->Signature = VIRTIO_PCI_DEVICE_SIGNATURE;
  Status = gBS->InstallProtocolInterface (&DeviceHandle,
                  &gVirtioDeviceProtocolGuid, EFI_NATIVE_INTERFACE,
                  &Device->VirtioDevice);
  if (EFI_ERROR (Status)) {
    goto UninitDev;
  }

  return EFI_SUCCESS;

UninitDev:
  VirtioPciUninit (Device);

RestorePciAttributes:
  Device->PciIo->Attributes (Device->PciIo, EfiPciIoAttributeOperationSet,
                Device->OriginalPciAttributes, NULL);

ClosePciIo:
  gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
         This->DriverBindingHandle, DeviceHandle);

FreeVirtioPci:
  FreePool (Device);

  return Status;
}

/**

  Stop driving the Virtio PCI device

  @param[in] This               The EFI_DRIVER_BINDING_PROTOCOL object
                                incorporating this driver (independently of any
                                device).

  @param[in] DeviceHandle       Stop driving this device.

  @param[in] NumberOfChildren   Since this function belongs to a device driver
                                only (as opposed to a bus driver), the caller
                                environment sets NumberOfChildren to zero, and
                                we ignore it.

  @param[in] ChildHandleBuffer  Ignored (corresponding to NumberOfChildren).

  @retval EFI_SUCCESS           Driver instance has been stopped and the PCI
                                configuration attributes have been restored.

  @return                       Error codes from the OpenProtocol() or
                                CloseProtocol(), UninstallProtocolInterface()
                                boot services.

**/
STATIC
EFI_STATUS
EFIAPI
VirtioPciDeviceBindingStop (
  IN EFI_DRIVER_BINDING_PROTOCOL *This,
  IN EFI_HANDLE                  DeviceHandle,
  IN UINTN                       NumberOfChildren,
  IN EFI_HANDLE                  *ChildHandleBuffer
  )
{
  EFI_STATUS               Status;
  VIRTIO_DEVICE_PROTOCOL  *VirtioDevice;
  VIRTIO_PCI_DEVICE       *Device;

  Status = gBS->OpenProtocol (
                  DeviceHandle,                  // candidate device
                  &gVirtioDeviceProtocolGuid,    // retrieve the VirtIo iface
                  (VOID **)&VirtioDevice,        // target pointer
                  This->DriverBindingHandle,     // requestor driver identity
                  DeviceHandle,                  // requesting lookup for dev.
                  EFI_OPEN_PROTOCOL_GET_PROTOCOL // lookup only, no ref. added
                  );
  if (EFI_ERROR (Status)) {
    return Status;
  }

  Device = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (VirtioDevice);

  //
  // Handle Stop() requests for in-use driver instances gracefully.
  //
  Status = gBS->UninstallProtocolInterface (DeviceHandle,
                  &gVirtioDeviceProtocolGuid, &Device->VirtioDevice);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  VirtioPciUninit (Device);

  Device->PciIo->Attributes (Device->PciIo, EfiPciIoAttributeOperationSet,
                Device->OriginalPciAttributes, NULL);

  Status = gBS->CloseProtocol (DeviceHandle, &gEfiPciIoProtocolGuid,
         This->DriverBindingHandle, DeviceHandle);

  FreePool (Device);

  return Status;
}


//
// The static object that groups the Supported() (ie. probe), Start() and
// Stop() functions of the driver together. Refer to UEFI Spec 2.3.1 + Errata
// C, 10.1 EFI Driver Binding Protocol.
//
STATIC EFI_DRIVER_BINDING_PROTOCOL gDriverBinding = {
  &VirtioPciDeviceBindingSupported,
  &VirtioPciDeviceBindingStart,
  &VirtioPciDeviceBindingStop,
  0x10, // Version, must be in [0x10 .. 0xFFFFFFEF] for IHV-developed drivers
  NULL, // ImageHandle, to be overwritten by
        // EfiLibInstallDriverBindingComponentName2() in VirtioPciEntryPoint()
  NULL  // DriverBindingHandle, ditto
};


//
// The purpose of the following scaffolding (EFI_COMPONENT_NAME_PROTOCOL and
// EFI_COMPONENT_NAME2_PROTOCOL implementation) is to format the driver's name
// in English, for display on standard console devices. This is recommended for
// UEFI drivers that follow the UEFI Driver Model. Refer to the Driver Writer's
// Guide for UEFI 2.3.1 v1.01, 11 UEFI Driver and Controller Names.
//
STATIC
EFI_UNICODE_STRING_TABLE mDriverNameTable[] = {
  { "eng;en", L"Virtio PCI Driver" },
  { NULL,     NULL                   }
};

STATIC
EFI_COMPONENT_NAME_PROTOCOL gComponentName;

EFI_STATUS
EFIAPI
VirtioPciGetDriverName (
  IN  EFI_COMPONENT_NAME_PROTOCOL *This,
  IN  CHAR8                       *Language,
  OUT CHAR16                      **DriverName
  )
{
  return LookupUnicodeString2 (
           Language,
           This->SupportedLanguages,
           mDriverNameTable,
           DriverName,
           (BOOLEAN)(This == &gComponentName) // Iso639Language
           );
}

EFI_STATUS
EFIAPI
VirtioPciGetDeviceName (
  IN  EFI_COMPONENT_NAME_PROTOCOL *This,
  IN  EFI_HANDLE                  DeviceHandle,
  IN  EFI_HANDLE                  ChildHandle,
  IN  CHAR8                       *Language,
  OUT CHAR16                      **ControllerName
  )
{
  return EFI_UNSUPPORTED;
}

STATIC
EFI_COMPONENT_NAME_PROTOCOL gComponentName = {
  &VirtioPciGetDriverName,
  &VirtioPciGetDeviceName,
  "eng" // SupportedLanguages, ISO 639-2 language codes
};

STATIC
EFI_COMPONENT_NAME2_PROTOCOL gComponentName2 = {
  (EFI_COMPONENT_NAME2_GET_DRIVER_NAME)     &VirtioPciGetDriverName,
  (EFI_COMPONENT_NAME2_GET_CONTROLLER_NAME) &VirtioPciGetDeviceName,
  "en" // SupportedLanguages, RFC 4646 language codes
};


//
// Entry point of this driver.
//
EFI_STATUS
EFIAPI
VirtioPciDeviceEntryPoint (
  IN EFI_HANDLE       ImageHandle,
  IN EFI_SYSTEM_TABLE *SystemTable
  )
{
  return EfiLibInstallDriverBindingComponentName2 (
           ImageHandle,
           SystemTable,
           &gDriverBinding,
           ImageHandle,
           &gComponentName,
           &gComponentName2
           );
}