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
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
|
/** @file
Console Platform DXE Driver, install Console Device Guids and update Console
Environment Variables.
Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
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 "ConPlatform.h"
EFI_DRIVER_BINDING_PROTOCOL gConPlatformTextInDriverBinding = {
ConPlatformTextInDriverBindingSupported,
ConPlatformTextInDriverBindingStart,
ConPlatformTextInDriverBindingStop,
0xa,
NULL,
NULL
};
EFI_DRIVER_BINDING_PROTOCOL gConPlatformTextOutDriverBinding = {
ConPlatformTextOutDriverBindingSupported,
ConPlatformTextOutDriverBindingStart,
ConPlatformTextOutDriverBindingStop,
0xa,
NULL,
NULL
};
/**
Entrypoint of this module.
This function is the entrypoint of this module. It installs Driver Binding
Protocols together with Component Name Protocols.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The entry point is executed successfully.
**/
EFI_STATUS
EFIAPI
InitializeConPlatform(
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
Status = EfiLibInstallDriverBindingComponentName2 (
ImageHandle,
SystemTable,
&gConPlatformTextInDriverBinding,
ImageHandle,
&gConPlatformComponentName,
&gConPlatformComponentName2
);
ASSERT_EFI_ERROR (Status);
Status = EfiLibInstallDriverBindingComponentName2 (
ImageHandle,
SystemTable,
&gConPlatformTextOutDriverBinding,
NULL,
&gConPlatformComponentName,
&gConPlatformComponentName2
);
ASSERT_EFI_ERROR (Status);
return EFI_SUCCESS;
}
/**
Test to see if EFI_SIMPLE_TEXT_INPUT_PROTOCOL is supported on ControllerHandle.
@param This Protocol instance pointer.
@param ControllerHandle Handle of device to test.
@param RemainingDevicePath Optional parameter use to pick a specific child
device to start.
@retval EFI_SUCCESS This driver supports this device.
@retval other This driver does not support this device.
**/
EFI_STATUS
EFIAPI
ConPlatformTextInDriverBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
)
{
return ConPlatformDriverBindingSupported (
This,
ControllerHandle,
&gEfiSimpleTextInProtocolGuid
);
}
/**
Test to see if EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL is supported on ControllerHandle.
@param This Protocol instance pointer.
@param ControllerHandle Handle of device to test.
@param RemainingDevicePath Optional parameter use to pick a specific child
device to start.
@retval EFI_SUCCESS This driver supports this device.
@retval other This driver does not support this device.
**/
EFI_STATUS
EFIAPI
ConPlatformTextOutDriverBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath OPTIONAL
)
{
return ConPlatformDriverBindingSupported (
This,
ControllerHandle,
&gEfiSimpleTextOutProtocolGuid
);
}
/**
Test to see if the specified protocol is supported on ControllerHandle.
@param This Protocol instance pointer.
@param ControllerHandle Handle of device to test.
@param ProtocolGuid The specfic protocol.
@retval EFI_SUCCESS This driver supports this device.
@retval other This driver does not support this device.
**/
EFI_STATUS
ConPlatformDriverBindingSupported (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_GUID *ProtocolGuid
)
{
EFI_STATUS Status;
VOID *Interface;
//
// Test to see if this is a physical device by checking if
// it has a Device Path Protocol.
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiDevicePathProtocolGuid,
NULL,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_TEST_PROTOCOL
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Test to see if this device supports the specified Protocol.
//
Status = gBS->OpenProtocol (
ControllerHandle,
ProtocolGuid,
(VOID **) &Interface,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (EFI_ERROR (Status)) {
return Status;
}
gBS->CloseProtocol (
ControllerHandle,
ProtocolGuid,
This->DriverBindingHandle,
ControllerHandle
);
return EFI_SUCCESS;
}
/**
Start this driver on the device for console input.
Start this driver on ControllerHandle by opening Simple Text Input Protocol,
reading Device Path, and installing Console In Devcice GUID on ControllerHandle.
If this devcie is not one hot-plug devce, append its device path into the
console environment variables ConInDev.
@param This Protocol instance pointer.
@param ControllerHandle 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
ConPlatformTextInDriverBindingStart (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
)
{
EFI_STATUS Status;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
EFI_SIMPLE_TEXT_INPUT_PROTOCOL *TextIn;
BOOLEAN IsInConInVariable;
//
// Get the Device Path Protocol so the environment variables can be updated
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiDevicePathProtocolGuid,
(VOID **) &DevicePath,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Open the Simple Text Input Protocol BY_DRIVER
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiSimpleTextInProtocolGuid,
(VOID **) &TextIn,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Check if the device path is in ConIn Variable
//
IsInConInVariable = FALSE;
Status = ConPlatformUpdateDeviceVariable (
L"ConIn",
DevicePath,
Check
);
if (!EFI_ERROR (Status)) {
IsInConInVariable = TRUE;
}
//
// Check the device path, if it is a hot plug device,
// do not put the device path into ConInDev, and install
// gEfiConsoleInDeviceGuid to the device handle directly.
// The policy is, make hot plug device plug in and play immediately.
//
if (IsHotPlugDevice (DevicePath)) {
gBS->InstallMultipleProtocolInterfaces (
&ControllerHandle,
&gEfiConsoleInDeviceGuid,
NULL,
NULL
);
//
// Append the device path to ConInDev only if it is in ConIn variable.
//
if (IsInConInVariable) {
ConPlatformUpdateDeviceVariable (
L"ConInDev",
DevicePath,
Append
);
}
} else {
//
// If it is not a hot-plug device, append the device path to the
// ConInDev environment variable
//
ConPlatformUpdateDeviceVariable (
L"ConInDev",
DevicePath,
Append
);
//
// If the device path is an instance in the ConIn environment variable,
// then install EfiConsoleInDeviceGuid onto ControllerHandle
//
if (IsInConInVariable) {
gBS->InstallMultipleProtocolInterfaces (
&ControllerHandle,
&gEfiConsoleInDeviceGuid,
NULL,
NULL
);
} else {
gBS->CloseProtocol (
ControllerHandle,
&gEfiSimpleTextInProtocolGuid,
This->DriverBindingHandle,
ControllerHandle
);
}
}
return EFI_SUCCESS;
}
/**
Start this driver on the device for console output and stardard error output.
Start this driver on ControllerHandle by opening Simple Text Output Protocol,
reading Device Path, and installing Console Out Devcic GUID, Standard Error
Device GUID on ControllerHandle.
If this devcie is not one hot-plug devce, append its device path into the
console environment variables ConOutDev, ErrOutDev.
@param This Protocol instance pointer.
@param ControllerHandle 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
ConPlatformTextOutDriverBindingStart (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN EFI_DEVICE_PATH_PROTOCOL *RemainingDevicePath
)
{
EFI_STATUS Status;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL *TextOut;
BOOLEAN NeedClose;
BOOLEAN IsInConOutVariable;
BOOLEAN IsInErrOutVariable;
NeedClose = TRUE;
//
// Get the Device Path Protocol so the environment variables can be updated
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiDevicePathProtocolGuid,
(VOID **) &DevicePath,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Open the Simple Text Output Protocol BY_DRIVER
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiSimpleTextOutProtocolGuid,
(VOID **) &TextOut,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_BY_DRIVER
);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Check if the device path is in ConOut & ErrOut Variable
//
IsInConOutVariable = FALSE;
Status = ConPlatformUpdateDeviceVariable (
L"ConOut",
DevicePath,
Check
);
if (!EFI_ERROR (Status)) {
IsInConOutVariable = TRUE;
}
IsInErrOutVariable = FALSE;
Status = ConPlatformUpdateDeviceVariable (
L"ErrOut",
DevicePath,
Check
);
if (!EFI_ERROR (Status)) {
IsInErrOutVariable = TRUE;
}
//
// Check the device path, if it is a hot plug device,
// do not put the device path into ConOutDev and ErrOutDev,
// and install gEfiConsoleOutDeviceGuid to the device handle directly.
// The policy is, make hot plug device plug in and play immediately.
//
if (IsHotPlugDevice (DevicePath)) {
gBS->InstallMultipleProtocolInterfaces (
&ControllerHandle,
&gEfiConsoleOutDeviceGuid,
NULL,
NULL
);
//
// Append the device path to ConOutDev only if it is in ConOut variable.
//
if (IsInConOutVariable) {
ConPlatformUpdateDeviceVariable (
L"ConOutDev",
DevicePath,
Append
);
}
//
// Append the device path to ErrOutDev only if it is in ErrOut variable.
//
if (IsInErrOutVariable) {
ConPlatformUpdateDeviceVariable (
L"ErrOutDev",
DevicePath,
Append
);
}
} else {
//
// If it is not a hot-plug device, first append the device path to the
// ConOutDev environment variable
//
ConPlatformUpdateDeviceVariable (
L"ConOutDev",
DevicePath,
Append
);
//
// Then append the device path to the ErrOutDev environment variable
//
ConPlatformUpdateDeviceVariable (
L"ErrOutDev",
DevicePath,
Append
);
//
// If the device path is an instance in the ConOut environment variable,
// then install EfiConsoleOutDeviceGuid onto ControllerHandle
//
if (IsInConOutVariable) {
NeedClose = FALSE;
Status = gBS->InstallMultipleProtocolInterfaces (
&ControllerHandle,
&gEfiConsoleOutDeviceGuid,
NULL,
NULL
);
}
//
// If the device path is an instance in the ErrOut environment variable,
// then install EfiStandardErrorDeviceGuid onto ControllerHandle
//
if (IsInErrOutVariable) {
NeedClose = FALSE;
gBS->InstallMultipleProtocolInterfaces (
&ControllerHandle,
&gEfiStandardErrorDeviceGuid,
NULL,
NULL
);
}
if (NeedClose) {
gBS->CloseProtocol (
ControllerHandle,
&gEfiSimpleTextOutProtocolGuid,
This->DriverBindingHandle,
ControllerHandle
);
}
}
return EFI_SUCCESS;
}
/**
Stop this driver on ControllerHandle by removing Console In Devcice GUID
and closing the Simple Text Input protocol on ControllerHandle.
@param This Protocol instance pointer.
@param ControllerHandle Handle of device to stop driver on
@param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of
children is zero stop the entire bus driver.
@param ChildHandleBuffer List of Child Handles to Stop.
@retval EFI_SUCCESS This driver is removed ControllerHandle
@retval other This driver was not removed from this device
**/
EFI_STATUS
EFIAPI
ConPlatformTextInDriverBindingStop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer
)
{
EFI_STATUS Status;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
//
// Get the Device Path Protocol firstly
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiDevicePathProtocolGuid,
(VOID **) &DevicePath,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
//
// If there is device path on ControllerHandle
//
if (!EFI_ERROR (Status)) {
//
// Remove DevicePath from ConInDev if exists.
//
ConPlatformUpdateDeviceVariable (
L"ConInDev",
DevicePath,
Delete
);
}
//
// Uninstall the Console Device GUIDs from Controller Handle
//
ConPlatformUnInstallProtocol (
This,
ControllerHandle,
&gEfiConsoleInDeviceGuid
);
//
// Close the Simple Text Input Protocol
//
gBS->CloseProtocol (
ControllerHandle,
&gEfiSimpleTextInProtocolGuid,
This->DriverBindingHandle,
ControllerHandle
);
return EFI_SUCCESS;
}
/**
Stop this driver on ControllerHandle by removing Console Out Devcice GUID
and closing the Simple Text Output protocol on ControllerHandle.
@param This Protocol instance pointer.
@param ControllerHandle Handle of device to stop driver on
@param NumberOfChildren Number of Handles in ChildHandleBuffer. If number of
children is zero stop the entire bus driver.
@param ChildHandleBuffer List of Child Handles to Stop.
@retval EFI_SUCCESS This driver is removed ControllerHandle
@retval other This driver was not removed from this device
**/
EFI_STATUS
EFIAPI
ConPlatformTextOutDriverBindingStop (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE ControllerHandle,
IN UINTN NumberOfChildren,
IN EFI_HANDLE *ChildHandleBuffer
)
{
EFI_STATUS Status;
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
//
// Get the Device Path Protocol firstly
//
Status = gBS->OpenProtocol (
ControllerHandle,
&gEfiDevicePathProtocolGuid,
(VOID **) &DevicePath,
This->DriverBindingHandle,
ControllerHandle,
EFI_OPEN_PROTOCOL_GET_PROTOCOL
);
if (!EFI_ERROR (Status)) {
//
// Remove DevicePath from ConOutDev and ErrOutDev if exists.
//
ConPlatformUpdateDeviceVariable (
L"ConOutDev",
DevicePath,
Delete
);
ConPlatformUpdateDeviceVariable (
L"ErrOutDev",
DevicePath,
Delete
);
}
//
// Uninstall the Console Device GUIDs from Controller Handle
//
ConPlatformUnInstallProtocol (
This,
ControllerHandle,
&gEfiConsoleOutDeviceGuid
);
ConPlatformUnInstallProtocol (
This,
ControllerHandle,
&gEfiStandardErrorDeviceGuid
);
//
// Close the Simple Text Output Protocol
//
gBS->CloseProtocol (
ControllerHandle,
&gEfiSimpleTextOutProtocolGuid,
This->DriverBindingHandle,
ControllerHandle
);
return EFI_SUCCESS;
}
/**
Uninstall the specified protocol.
@param This Protocol instance pointer.
@param Handle Handle of device to uninstall protocol on.
@param ProtocolGuid The specified protocol need to be uninstalled.
**/
VOID
ConPlatformUnInstallProtocol (
IN EFI_DRIVER_BINDING_PROTOCOL *This,
IN EFI_HANDLE Handle,
IN EFI_GUID *ProtocolGuid
)
{
EFI_STATUS Status;
Status = gBS->OpenProtocol (
Handle,
ProtocolGuid,
NULL,
This->DriverBindingHandle,
Handle,
EFI_OPEN_PROTOCOL_TEST_PROTOCOL
);
if (!EFI_ERROR (Status)) {
gBS->UninstallMultipleProtocolInterfaces (
Handle,
ProtocolGuid,
NULL,
NULL
);
}
return ;
}
/**
Get the necessary size of buffer and read the variable.
First get the necessary size of buffer. Then read the
EFI variable (Name) and return a dynamically allocated
buffer. On failure return NULL.
@param Name String part of EFI variable name
@return Dynamically allocated memory that contains a copy of the EFI variable.
Caller is repsoncible freeing the buffer. Return NULL means Variable
was not read.
**/
VOID *
ConPlatformGetVariable (
IN CHAR16 *Name
)
{
EFI_STATUS Status;
VOID *Buffer;
UINTN BufferSize;
BufferSize = 0;
Buffer = NULL;
//
// Test to see if the variable exists. If it doesn't, return NULL.
//
Status = gRT->GetVariable (
Name,
&gEfiGlobalVariableGuid,
NULL,
&BufferSize,
Buffer
);
if (Status == EFI_BUFFER_TOO_SMALL) {
//
// Allocate the buffer to return
//
Buffer = AllocatePool (BufferSize);
if (Buffer == NULL) {
return NULL;
}
//
// Read variable into the allocated buffer.
//
Status = gRT->GetVariable (
Name,
&gEfiGlobalVariableGuid,
NULL,
&BufferSize,
Buffer
);
if (EFI_ERROR (Status)) {
FreePool (Buffer);
//
// To make sure Buffer is NULL if any error occurs.
//
Buffer = NULL;
}
}
return Buffer;
}
/**
Function compares a device path data structure to that of all the nodes of a
second device path instance.
@param Multi A pointer to a multi-instance device path data structure.
@param Single A pointer to a single-instance device path data structure.
@param NewDevicePath If Delete is TRUE, this parameter must not be null, and it
points to the remaining device path data structure.
(remaining device path = Multi - Single.)
@param Delete If TRUE, means removing Single from Multi.
If FALSE, the routine just check whether Single matches
with any instance in Multi.
@retval EFI_SUCCESS If the Single is contained within Multi.
@retval EFI_NOT_FOUND If the Single is not contained within Multi.
@retval EFI_INVALID_PARAMETER Multi is NULL.
@retval EFI_INVALID_PARAMETER Single is NULL.
@retval EFI_INVALID_PARAMETER NewDevicePath is NULL when Delete is TRUE.
**/
EFI_STATUS
ConPlatformMatchDevicePaths (
IN EFI_DEVICE_PATH_PROTOCOL *Multi,
IN EFI_DEVICE_PATH_PROTOCOL *Single,
OUT EFI_DEVICE_PATH_PROTOCOL **NewDevicePath OPTIONAL,
IN BOOLEAN Delete
)
{
EFI_DEVICE_PATH_PROTOCOL *DevicePath;
EFI_DEVICE_PATH_PROTOCOL *TempDevicePath1;
EFI_DEVICE_PATH_PROTOCOL *TempDevicePath2;
EFI_DEVICE_PATH_PROTOCOL *DevicePathInst;
UINTN Size;
//
// The passed in DevicePath should not be NULL
//
if ((Multi == NULL) || (Single == NULL)) {
return EFI_INVALID_PARAMETER;
}
//
// If performing Delete operation, the NewDevicePath must not be NULL.
//
if (Delete) {
if (NewDevicePath == NULL) {
return EFI_INVALID_PARAMETER;
}
}
TempDevicePath1 = NULL;
DevicePath = Multi;
DevicePathInst = GetNextDevicePathInstance (&DevicePath, &Size);
//
// Search for the match of 'Single' in 'Multi'
//
while (DevicePathInst != NULL) {
if (CompareMem (Single, DevicePathInst, Size) == 0) {
if (!Delete) {
//
// If Delete is FALSE, return EFI_SUCCESS if Single is found in Multi.
//
FreePool (DevicePathInst);
return EFI_SUCCESS;
}
} else {
if (Delete) {
//
// If the node of Multi does not match Single, then added it back to the result.
// That is, the node matching Single will be dropped and deleted from result.
//
TempDevicePath2 = AppendDevicePathInstance (
TempDevicePath1,
DevicePathInst
);
if (TempDevicePath1 != NULL) {
FreePool (TempDevicePath1);
}
TempDevicePath1 = TempDevicePath2;
}
}
FreePool (DevicePathInst);
DevicePathInst = GetNextDevicePathInstance (&DevicePath, &Size);
}
if (Delete) {
//
// Return the new device path data structure with specified node deleted.
//
*NewDevicePath = TempDevicePath1;
return EFI_SUCCESS;
}
return EFI_NOT_FOUND;
}
/**
Update console environment variables.
@param VariableName Console environment variables, ConOutDev, ConInDev
ErrOutDev, ConIn ,ConOut or ErrOut.
@param DevicePath Console devcie's device path.
@param Operation Variable operations, including APPEND, CHECK and DELETE.
@retval EFI_SUCCESS Variable operates successfully.
@retval EFI_OUT_OF_RESOURCES If variable cannot be appended.
@retval other Variable updating failed.
**/
EFI_STATUS
ConPlatformUpdateDeviceVariable (
IN CHAR16 *VariableName,
IN EFI_DEVICE_PATH_PROTOCOL *DevicePath,
IN CONPLATFORM_VAR_OPERATION Operation
)
{
EFI_STATUS Status;
EFI_DEVICE_PATH_PROTOCOL *VariableDevicePath;
EFI_DEVICE_PATH_PROTOCOL *NewVariableDevicePath;
VariableDevicePath = NULL;
NewVariableDevicePath = NULL;
//
// Get Variable according to variable name.
// The memory for Variable is allocated within ConPlatformGetVarible(),
// it is the caller's responsibility to free the memory before return.
//
VariableDevicePath = ConPlatformGetVariable (VariableName);
if (Operation != Delete) {
//
// Match specified DevicePath in Console Variable.
//
Status = ConPlatformMatchDevicePaths (
VariableDevicePath,
DevicePath,
NULL,
FALSE
);
if ((Operation == Check) || (!EFI_ERROR (Status))) {
//
// Branch here includes 2 cases:
// 1. Operation is CHECK, simply return Status.
// 2. Operation is APPEND, and device path already exists in variable, also return.
//
if (VariableDevicePath != NULL) {
FreePool (VariableDevicePath);
}
return Status;
}
//
// We reach here to append a device path that does not exist in variable.
//
Status = EFI_SUCCESS;
NewVariableDevicePath = AppendDevicePathInstance (
VariableDevicePath,
DevicePath
);
if (NewVariableDevicePath == NULL) {
Status = EFI_OUT_OF_RESOURCES;
}
} else {
//
// We reach here to remove DevicePath from the environment variable that
// is a multi-instance device path.
//
Status = ConPlatformMatchDevicePaths (
VariableDevicePath,
DevicePath,
&NewVariableDevicePath,
TRUE
);
}
if (VariableDevicePath != NULL) {
FreePool (VariableDevicePath);
}
if (EFI_ERROR (Status)) {
return Status;
}
if (NewVariableDevicePath != NULL) {
//
// Update Console Environment Variable.
//
Status = gRT->SetVariable (
VariableName,
&gEfiGlobalVariableGuid,
EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS,
GetDevicePathSize (NewVariableDevicePath),
NewVariableDevicePath
);
FreePool (NewVariableDevicePath);
}
return Status;
}
/**
Check if the device supports hot-plug through its device path.
This function could be updated to check more types of Hot Plug devices.
Currently, it checks USB and PCCard device.
@param DevicePath Pointer to device's device path.
@retval TRUE The devcie is a hot-plug device
@retval FALSE The devcie is not a hot-plug device.
**/
BOOLEAN
IsHotPlugDevice (
IN EFI_DEVICE_PATH_PROTOCOL *DevicePath
)
{
EFI_DEVICE_PATH_PROTOCOL *CheckDevicePath;
CheckDevicePath = DevicePath;
while (!IsDevicePathEnd (CheckDevicePath)) {
//
// Check device whether is hot plug device or not throught Device Path
//
if ((DevicePathType (CheckDevicePath) == MESSAGING_DEVICE_PATH) &&
(DevicePathSubType (CheckDevicePath) == MSG_USB_DP ||
DevicePathSubType (CheckDevicePath) == MSG_USB_CLASS_DP ||
DevicePathSubType (CheckDevicePath) == MSG_USB_WWID_DP)) {
//
// If Device is USB device
//
return TRUE;
}
if ((DevicePathType (CheckDevicePath) == HARDWARE_DEVICE_PATH) &&
(DevicePathSubType (CheckDevicePath) == HW_PCCARD_DP)) {
//
// If Device is PCCard
//
return TRUE;
}
CheckDevicePath = NextDevicePathNode (CheckDevicePath);
}
return FALSE;
}
|