summaryrefslogtreecommitdiff
path: root/EmulatorPkg/EmuGopDxe/GopInput.c
blob: cf37a7bd70a2bb2fef88d08c4200ad9e07401a41 (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
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
/*++ @file

Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
Portions copyright (c) 2010 0 2011,Apple Inc. 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 "Gop.h"


BOOLEAN
GopPrivateIsKeyRegistered (
  IN EFI_KEY_DATA  *RegsiteredData,
  IN EFI_KEY_DATA  *InputData
  )
/*++

Routine Description:

Arguments:

  RegsiteredData    - A pointer to a buffer that is filled in with the keystroke
                      state data for the key that was registered.
  InputData         - A pointer to a buffer that is filled in with the keystroke
                      state data for the key that was pressed.

Returns:
  TRUE              - Key be pressed matches a registered key.
  FLASE             - Match failed.

**/
{
  ASSERT (RegsiteredData != NULL && InputData != NULL);

  if ((RegsiteredData->Key.ScanCode    != InputData->Key.ScanCode) ||
      (RegsiteredData->Key.UnicodeChar != InputData->Key.UnicodeChar)) {
    return FALSE;
  }

  //
  // Assume KeyShiftState/KeyToggleState = 0 in Registered key data means these state could be ignored.
  //
  if (RegsiteredData->KeyState.KeyShiftState != 0 &&
      RegsiteredData->KeyState.KeyShiftState != InputData->KeyState.KeyShiftState) {
    return FALSE;
  }
  if (RegsiteredData->KeyState.KeyToggleState != 0 &&
      RegsiteredData->KeyState.KeyToggleState != InputData->KeyState.KeyToggleState) {
    return FALSE;
  }

  return TRUE;

}


VOID
EFIAPI
GopPrivateMakeCallbackFunction (
  IN VOID           *Context,
  IN EFI_KEY_DATA   *KeyData
  )
{
  LIST_ENTRY                        *Link;
  EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY  *CurrentNotify;
  GOP_PRIVATE_DATA                  *Private = (GOP_PRIVATE_DATA *)Context;

  KeyMapMake (KeyData);

  for (Link = Private->NotifyList.ForwardLink; Link != &Private->NotifyList; Link = Link->ForwardLink) {
    CurrentNotify = CR (
                      Link,
                      EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY,
                      NotifyEntry,
                      EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY_SIGNATURE
                      );
    if (GopPrivateIsKeyRegistered (&CurrentNotify->KeyData, KeyData)) {
      // We could be called at a high TPL so signal an event to call the registered function
      // at a lower TPL.
      gBS->SignalEvent (CurrentNotify->Event);
    }
  }
}


VOID
EFIAPI
GopPrivateBreakCallbackFunction (
  IN VOID           *Context,
  IN EFI_KEY_DATA   *KeyData
  )
{
  KeyMapBreak (KeyData);
}



//
// Simple Text In implementation.
//

/**
  Reset the input device and optionally run diagnostics

  @param  This                 Protocol instance pointer.
  @param  ExtendedVerification Driver may perform diagnostics on reset.

  @retval EFI_SUCCESS          The device was reset.
  @retval EFI_DEVICE_ERROR     The device is not functioning properly and could not be reset.

**/
EFI_STATUS
EFIAPI
EmuGopSimpleTextInReset (
  IN EFI_SIMPLE_TEXT_INPUT_PROTOCOL       *This,
  IN BOOLEAN                              ExtendedVerification
  )
{
  GOP_PRIVATE_DATA  *Private;
  EFI_KEY_DATA      KeyData;
  EFI_TPL           OldTpl;

  Private = GOP_PRIVATE_DATA_FROM_TEXT_IN_THIS (This);
  if (Private->EmuGraphicsWindow == NULL) {
    return EFI_SUCCESS;
  }

  //
  // Enter critical section
  //
  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);

  //
  // A reset is draining the Queue
  //
  while (Private->EmuGraphicsWindow->GetKey (Private->EmuGraphicsWindow, &KeyData) == EFI_SUCCESS)
    ;

  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);
  return EFI_SUCCESS;
}


/**
  Reads the next keystroke from the input device. The WaitForKey Event can
  be used to test for existence of a keystroke via WaitForEvent () call.

  @param  This  Protocol instance pointer.
  @param  Key   A pointer to a buffer that is filled in with the keystroke
                information for the key that was pressed.

  @retval EFI_SUCCESS      The keystroke information was returned.
  @retval EFI_NOT_READY    There was no keystroke data available.
  @retval EFI_DEVICE_ERROR The keystroke information was not returned due to
                           hardware errors.

**/
EFI_STATUS
EFIAPI
EmuGopSimpleTextInReadKeyStroke (
  IN EFI_SIMPLE_TEXT_INPUT_PROTOCOL       *This,
  OUT EFI_INPUT_KEY                       *Key
  )
{
  GOP_PRIVATE_DATA  *Private;
  EFI_STATUS        Status;
  EFI_TPL           OldTpl;
  EFI_KEY_DATA      KeyData;

  Private = GOP_PRIVATE_DATA_FROM_TEXT_IN_THIS (This);
  if (Private->EmuGraphicsWindow == NULL) {
    return EFI_NOT_READY;
  }

  //
  // Enter critical section
  //
  OldTpl  = gBS->RaiseTPL (TPL_NOTIFY);

  Status  = Private->EmuGraphicsWindow->GetKey (Private->EmuGraphicsWindow, &KeyData);
  if (!EFI_ERROR (Status)) {
    if ((KeyData.Key.ScanCode == 0) && (KeyData.Key.UnicodeChar == 0)) {
      // Modifier key was pressed
      Status = EFI_NOT_READY;
    } else {
      CopyMem (Key, &KeyData.Key, sizeof (EFI_INPUT_KEY));
    }
  }

  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);

  return Status;
}



/**
  SimpleTextIn and SimpleTextInEx Notify Wait Event

  @param  Event                 Event whose notification function is being invoked.
  @param  Context               Pointer to GOP_PRIVATE_DATA.

**/
VOID
EFIAPI
EmuGopSimpleTextInWaitForKey (
  IN EFI_EVENT          Event,
  IN VOID               *Context
  )
{
  GOP_PRIVATE_DATA  *Private;
  EFI_STATUS        Status;
  EFI_TPL           OldTpl;

  Private = (GOP_PRIVATE_DATA *) Context;
  if (Private->EmuGraphicsWindow == NULL) {
    return;
  }

  //
  // Enter critical section
  //
  OldTpl  = gBS->RaiseTPL (TPL_NOTIFY);

  Status  = Private->EmuGraphicsWindow->CheckKey (Private->EmuGraphicsWindow);
  if (!EFI_ERROR (Status)) {
    //
    // If a there is a key in the queue signal our event.
    //
    gBS->SignalEvent (Event);
  }
  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);
}


//
// Simple Text Input Ex protocol functions
//


/**
  The Reset() function resets the input device hardware. As part
  of initialization process, the firmware/device will make a quick
  but reasonable attempt to verify that the device is functioning.
  If the ExtendedVerification flag is TRUE the firmware may take
  an extended amount of time to verify the device is operating on
  reset. Otherwise the reset operation is to occur as quickly as
  possible. The hardware verification process is not defined by
  this specification and is left up to the platform firmware or
  driver to implement.

  @param This                 A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param ExtendedVerification Indicates that the driver may
                              perform a more exhaustive
                              verification operation of the
                              device during reset.


  @retval EFI_SUCCESS       The device was reset.

  @retval EFI_DEVICE_ERROR  The device is not functioning
                            correctly and could not be reset.

**/
EFI_STATUS
EFIAPI
EmuGopSimpleTextInExResetEx (
  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
  IN BOOLEAN                            ExtendedVerification
  )
/*++

  Routine Description:
    Reset the input device and optionaly run diagnostics

  Arguments:
    This                 - Protocol instance pointer.
    ExtendedVerification - Driver may perform diagnostics on reset.

  Returns:
    EFI_SUCCESS           - The device was reset.

**/
{
  return EFI_SUCCESS;
}



/**
  The function reads the next keystroke from the input device. If
  there is no pending keystroke the function returns
  EFI_NOT_READY. If there is a pending keystroke, then
  KeyData.Key.ScanCode is the EFI scan code defined in Error!
  Reference source not found. The KeyData.Key.UnicodeChar is the
  actual printable character or is zero if the key does not
  represent a printable character (control key, function key,
  etc.). The KeyData.KeyState is shift state for the character
  reflected in KeyData.Key.UnicodeChar or KeyData.Key.ScanCode .
  When interpreting the data from this function, it should be
  noted that if a class of printable characters that are
  normally adjusted by shift modifiers (e.g. Shift Key + "f"
  key) would be presented solely as a KeyData.Key.UnicodeChar
  without the associated shift state. So in the previous example
  of a Shift Key + "f" key being pressed, the only pertinent
  data returned would be KeyData.Key.UnicodeChar with the value
  of "F". This of course would not typically be the case for
  non-printable characters such as the pressing of the Right
  Shift Key + F10 key since the corresponding returned data
  would be reflected both in the KeyData.KeyState.KeyShiftState
  and KeyData.Key.ScanCode values. UEFI drivers which implement
  the EFI_SIMPLE_TEXT_INPUT_EX protocol are required to return
  KeyData.Key and KeyData.KeyState values. These drivers must
  always return the most current state of
  KeyData.KeyState.KeyShiftState and
  KeyData.KeyState.KeyToggleState. It should also be noted that
  certain input devices may not be able to produce shift or toggle
  state information, and in those cases the high order bit in the
  respective Toggle and Shift state fields should not be active.


  @param This     A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param KeyData  A pointer to a buffer that is filled in with
                  the keystroke state data for the key that was
                  pressed.


  @retval EFI_SUCCESS     The keystroke information was
                          returned.

  @retval EFI_NOT_READY   There was no keystroke data available.
                          EFI_DEVICE_ERROR The keystroke
                          information was not returned due to
                          hardware errors.


**/
EFI_STATUS
EFIAPI
EmuGopSimpleTextInExReadKeyStrokeEx (
  IN  EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *This,
  OUT EFI_KEY_DATA                      *KeyData
  )
/*++

  Routine Description:
    Reads the next keystroke from the input device. The WaitForKey Event can
    be used to test for existance of a keystroke via WaitForEvent () call.

  Arguments:
    This       - Protocol instance pointer.
    KeyData    - A pointer to a buffer that is filled in with the keystroke
                 state data for the key that was pressed.

  Returns:
    EFI_SUCCESS           - The keystroke information was returned.
    EFI_NOT_READY         - There was no keystroke data availiable.
    EFI_DEVICE_ERROR      - The keystroke information was not returned due to
                            hardware errors.
    EFI_INVALID_PARAMETER - KeyData is NULL.

**/
{
  EFI_STATUS        Status;
  GOP_PRIVATE_DATA  *Private;
  EFI_TPL           OldTpl;


  if (KeyData == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  Private = GOP_PRIVATE_DATA_FROM_TEXT_IN_EX_THIS (This);
  if (Private->EmuGraphicsWindow == NULL) {
    return EFI_NOT_READY;
  }

  //
  // Enter critical section
  //
  OldTpl  = gBS->RaiseTPL (TPL_NOTIFY);

  Status  = Private->EmuGraphicsWindow->GetKey(Private->EmuGraphicsWindow, KeyData);

  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);

  return Status;
}



/**
  The SetState() function allows the input device hardware to
  have state settings adjusted.

  @param This           A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param KeyToggleState Pointer to the EFI_KEY_TOGGLE_STATE to
                        set the state for the input device.


  @retval EFI_SUCCESS       The device state was set appropriately.

  @retval EFI_DEVICE_ERROR  The device is not functioning
                            correctly and could not have the
                            setting adjusted.

  @retval EFI_UNSUPPORTED   The device does not support the
                            ability to have its state set.

**/
EFI_STATUS
EFIAPI
EmuGopSimpleTextInExSetState (
  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
  IN EFI_KEY_TOGGLE_STATE               *KeyToggleState
  )
{
  GOP_PRIVATE_DATA  *Private;
  EFI_STATUS        Status;
  EFI_TPL           OldTpl;

  Private = GOP_PRIVATE_DATA_FROM_TEXT_IN_EX_THIS (This);
  if (Private->EmuGraphicsWindow == NULL) {
    return EFI_NOT_READY;
  }

  //
  // Enter critical section
  //
  OldTpl  = gBS->RaiseTPL (TPL_NOTIFY);

  Status  = Private->EmuGraphicsWindow->KeySetState (Private->EmuGraphicsWindow, KeyToggleState);
  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);

  return Status;
}


/**
  SimpleTextIn and SimpleTextInEx Notify Wait Event

  @param  Event                 Event whose notification function is being invoked.
  @param  Context               Pointer to GOP_PRIVATE_DATA.

**/
VOID
EFIAPI
EmuGopRegisterKeyCallback (
  IN EFI_EVENT          Event,
  IN VOID               *Context
  )
{
  EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY *ExNotify = (EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY *)Context;

  ExNotify->KeyNotificationFn (&ExNotify->KeyData);
}



/**
  The RegisterKeystrokeNotify() function registers a function
  which will be called when a specified keystroke will occur.

  @param This                     A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param KeyData                  A pointer to a buffer that is filled in with
                                  the keystroke information for the key that was
                                  pressed.

  @param KeyNotificationFunction  Points to the function to be
                                  called when the key sequence
                                  is typed specified by KeyData.


  @param NotifyHandle             Points to the unique handle assigned to
                                  the registered notification.

  @retval EFI_SUCCESS           The device state was set
                                appropriately.

  @retval EFI_OUT_OF_RESOURCES  Unable to allocate necessary
                                data structures.

**/
EFI_STATUS
EFIAPI
EmuGopSimpleTextInExRegisterKeyNotify (
  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
  IN EFI_KEY_DATA                       *KeyData,
  IN EFI_KEY_NOTIFY_FUNCTION            KeyNotificationFunction,
  OUT EFI_HANDLE                        *NotifyHandle
  )
{
  EFI_STATUS                          Status;
  GOP_PRIVATE_DATA                    *Private;
  EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY     *CurrentNotify;
  LIST_ENTRY                          *Link;
  EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY     *NewNotify;

  if (KeyData == NULL || KeyNotificationFunction == NULL || NotifyHandle == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  Private = GOP_PRIVATE_DATA_FROM_TEXT_IN_EX_THIS (This);

  //
  // Return EFI_SUCCESS if the (KeyData, NotificationFunction) is already registered.
  //
  for (Link = Private->NotifyList.ForwardLink; Link != &Private->NotifyList; Link = Link->ForwardLink) {
    CurrentNotify = CR (
                      Link,
                      EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY,
                      NotifyEntry,
                      EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY_SIGNATURE
                      );
    if (GopPrivateIsKeyRegistered (&CurrentNotify->KeyData, KeyData)) {
      if (CurrentNotify->KeyNotificationFn == KeyNotificationFunction) {
        *NotifyHandle = CurrentNotify->NotifyHandle;
        return EFI_SUCCESS;
      }
    }
  }

  //
  // Allocate resource to save the notification function
  //
  NewNotify = (EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY *) AllocateZeroPool (sizeof (EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY));
  if (NewNotify == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  NewNotify->Signature         = EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY_SIGNATURE;
  NewNotify->KeyNotificationFn = KeyNotificationFunction;
  NewNotify->NotifyHandle      = (EFI_HANDLE) NewNotify;
  CopyMem (&NewNotify->KeyData, KeyData, sizeof (KeyData));
  InsertTailList (&Private->NotifyList, &NewNotify->NotifyEntry);

  Status = gBS->CreateEvent (
                  EVT_NOTIFY_SIGNAL,
                  TPL_NOTIFY,
                  EmuGopRegisterKeyCallback,
                  NewNotify,
                  &NewNotify->Event
                  );
  ASSERT_EFI_ERROR (Status);


  *NotifyHandle = NewNotify->NotifyHandle;

  return EFI_SUCCESS;

}


/**
  The UnregisterKeystrokeNotify() function removes the
  notification which was previously registered.

  @param This               A pointer to the EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL instance.

  @param NotificationHandle The handle of the notification
                            function being unregistered.

  @retval EFI_SUCCESS The device state was set appropriately.

  @retval EFI_INVALID_PARAMETER The NotificationHandle is
                                invalid.

**/
EFI_STATUS
EFIAPI
EmuGopSimpleTextInExUnregisterKeyNotify (
  IN EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL  *This,
  IN EFI_HANDLE                         NotificationHandle
  )
/*++

  Routine Description:
    Remove a registered notification function from a particular keystroke.

  Arguments:
    This                    - Protocol instance pointer.
    NotificationHandle      - The handle of the notification function being unregistered.

  Returns:
    EFI_SUCCESS             - The notification function was unregistered successfully.
    EFI_INVALID_PARAMETER   - The NotificationHandle is invalid.

**/
{
  GOP_PRIVATE_DATA                   *Private;
  LIST_ENTRY                         *Link;
  EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY *CurrentNotify;

  if (NotificationHandle == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  if (((EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY *) NotificationHandle)->Signature != EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY_SIGNATURE) {
    return EFI_INVALID_PARAMETER;
  }

  Private = GOP_PRIVATE_DATA_FROM_TEXT_IN_EX_THIS (This);

  for (Link = Private->NotifyList.ForwardLink; Link != &Private->NotifyList; Link = Link->ForwardLink) {
    CurrentNotify = CR (
                      Link,
                      EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY,
                      NotifyEntry,
                      EMU_GOP_SIMPLE_TEXTIN_EX_NOTIFY_SIGNATURE
                      );
    if (CurrentNotify->NotifyHandle == NotificationHandle) {
      //
      // Remove the notification function from NotifyList and free resources
      //
      RemoveEntryList (&CurrentNotify->NotifyEntry);

      gBS->CloseEvent (CurrentNotify->Event);

      gBS->FreePool (CurrentNotify);
      return EFI_SUCCESS;
    }
  }

  //
  // Can not find the specified Notification Handle
  //
  return EFI_INVALID_PARAMETER;
}



/**
  Initialize SimplelTextIn and SimpleTextInEx protocols in the Private
  context structure.

  @param  Private               Context structure to fill in.

  @return EFI_SUCCESS           Initialization was a success

**/
EFI_STATUS
EmuGopInitializeSimpleTextInForWindow (
  IN  GOP_PRIVATE_DATA    *Private
  )
{
  EFI_STATUS  Status;

  //
  // Initialize Simple Text In protoocol
  //
  Private->SimpleTextIn.Reset         = EmuGopSimpleTextInReset;
  Private->SimpleTextIn.ReadKeyStroke = EmuGopSimpleTextInReadKeyStroke;

  Status = gBS->CreateEvent (
                  EVT_NOTIFY_WAIT,
                  TPL_NOTIFY,
                  EmuGopSimpleTextInWaitForKey,
                  Private,
                  &Private->SimpleTextIn.WaitForKey
                  );
  ASSERT_EFI_ERROR (Status);


  //
  // Initialize Simple Text In Ex
  //

  Private->SimpleTextInEx.Reset               = EmuGopSimpleTextInExResetEx;
  Private->SimpleTextInEx.ReadKeyStrokeEx     = EmuGopSimpleTextInExReadKeyStrokeEx;
  Private->SimpleTextInEx.SetState            = EmuGopSimpleTextInExSetState;
  Private->SimpleTextInEx.RegisterKeyNotify   = EmuGopSimpleTextInExRegisterKeyNotify;
  Private->SimpleTextInEx.UnregisterKeyNotify = EmuGopSimpleTextInExUnregisterKeyNotify;

  Private->SimpleTextInEx.Reset (&Private->SimpleTextInEx, FALSE);

  InitializeListHead (&Private->NotifyList);

  Status = gBS->CreateEvent (
                  EVT_NOTIFY_WAIT,
                  TPL_NOTIFY,
                  EmuGopSimpleTextInWaitForKey,
                  Private,
                  &Private->SimpleTextInEx.WaitForKeyEx
                  );
  ASSERT_EFI_ERROR (Status);


  return Status;
}







//
// Simple Pointer implementation.
//


/**
  Resets the pointer device hardware.

  @param  This                  A pointer to the EFI_SIMPLE_POINTER_PROTOCOL
                                instance.
  @param  ExtendedVerification  Indicates that the driver may perform a more exhaustive
                                verification operation of the device during reset.

  @retval EFI_SUCCESS           The device was reset.
  @retval EFI_DEVICE_ERROR      The device is not functioning correctly and could not be reset.

**/
EFI_STATUS
EFIAPI
EmuGopSimplePointerReset (
  IN EFI_SIMPLE_POINTER_PROTOCOL          *This,
  IN BOOLEAN                              ExtendedVerification
  )
{
  GOP_PRIVATE_DATA             *Private;
  EFI_SIMPLE_POINTER_STATE     State;
  EFI_TPL                      OldTpl;

  Private = GOP_PRIVATE_DATA_FROM_POINTER_MODE_THIS (This);
  if (Private->EmuGraphicsWindow == NULL) {
    return EFI_SUCCESS;
  }

  //
  // Enter critical section
  //
  OldTpl = gBS->RaiseTPL (TPL_NOTIFY);

  //
  // A reset is draining the Queue
  //
  while (Private->EmuGraphicsWindow->GetPointerState (Private->EmuGraphicsWindow, &State) == EFI_SUCCESS)
    ;

  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);
  return EFI_SUCCESS;
}


/**
  Retrieves the current state of a pointer device.

  @param  This                  A pointer to the EFI_SIMPLE_POINTER_PROTOCOL
                                instance.
  @param  State                 A pointer to the state information on the pointer device.

  @retval EFI_SUCCESS           The state of the pointer device was returned in State.
  @retval EFI_NOT_READY         The state of the pointer device has not changed since the last call to
                                GetState().
  @retval EFI_DEVICE_ERROR      A device error occurred while attempting to retrieve the pointer device's
                                current state.

**/
EFI_STATUS
EFIAPI
EmuGopSimplePointerGetState (
  IN EFI_SIMPLE_POINTER_PROTOCOL          *This,
  IN OUT EFI_SIMPLE_POINTER_STATE         *State
  )
{
  GOP_PRIVATE_DATA  *Private;
  EFI_STATUS        Status;
  EFI_TPL           OldTpl;

  Private = GOP_PRIVATE_DATA_FROM_POINTER_MODE_THIS (This);
  if (Private->EmuGraphicsWindow == NULL) {
    return EFI_NOT_READY;
  }

  //
  // Enter critical section
  //
  OldTpl  = gBS->RaiseTPL (TPL_NOTIFY);

  Status  = Private->EmuGraphicsWindow->GetPointerState (Private->EmuGraphicsWindow, State);
  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);

  return Status;
}


/**
  SimplePointer Notify Wait Event

  @param  Event                 Event whose notification function is being invoked.
  @param  Context               Pointer to GOP_PRIVATE_DATA.

**/
VOID
EFIAPI
EmuGopSimplePointerWaitForInput (
  IN EFI_EVENT          Event,
  IN VOID               *Context
  )
{
  GOP_PRIVATE_DATA  *Private;
  EFI_STATUS        Status;
  EFI_TPL           OldTpl;

  Private = (GOP_PRIVATE_DATA *) Context;
  if (Private->EmuGraphicsWindow == NULL) {
    return;
  }

  //
  // Enter critical section
  //
  OldTpl  = gBS->RaiseTPL (TPL_NOTIFY);

  Status  = Private->EmuGraphicsWindow->CheckPointer (Private->EmuGraphicsWindow);
  if (!EFI_ERROR (Status)) {
    //
    // If the pointer state has changed, signal our event.
    //
    gBS->SignalEvent (Event);
  }
  //
  // Leave critical section and return
  //
  gBS->RestoreTPL (OldTpl);
}


/**
  SimplePointer constructor

  @param  Private Context structure to fill in.

  @retval EFI_SUCCESS Constructor had success

**/
EFI_STATUS
EmuGopInitializeSimplePointerForWindow (
  IN  GOP_PRIVATE_DATA    *Private
  )
{
  EFI_STATUS  Status;

  //
  // Initialize Simple Pointer protoocol
  //
  Private->PointerMode.ResolutionX = 1;
  Private->PointerMode.ResolutionY = 1;
  Private->PointerMode.ResolutionZ = 1;
  Private->PointerMode.LeftButton  = TRUE;
  Private->PointerMode.RightButton = TRUE;

  Private->SimplePointer.Reset     = EmuGopSimplePointerReset;
  Private->SimplePointer.GetState  = EmuGopSimplePointerGetState;
  Private->SimplePointer.Mode      = &Private->PointerMode;

  Status = gBS->CreateEvent (
                  EVT_NOTIFY_WAIT,
                  TPL_NOTIFY,
                  EmuGopSimplePointerWaitForInput,
                  Private,
                  &Private->SimplePointer.WaitForInput
                  );

  return Status;
}