summaryrefslogtreecommitdiff
path: root/IntelFrameworkModulePkg/Library/GenericBdsLib/BdsMisc.c
blob: 4ea30bdf7defb1fa8e5356a80d24629d1da46b3d (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
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
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
/** @file
  Misc BDS library function

Copyright (c) 2004 - 2014, 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 "InternalBdsLib.h"


#define MAX_STRING_LEN        200

BOOLEAN   mFeaturerSwitch = TRUE;
BOOLEAN   mResetRequired  = FALSE;

extern UINT16 gPlatformBootTimeOutDefault;

/**
  The function will go through the driver option link list, load and start
  every driver the driver option device path point to.

  @param  BdsDriverLists        The header of the current driver option link list

**/
VOID
EFIAPI
BdsLibLoadDrivers (
  IN LIST_ENTRY                   *BdsDriverLists
  )
{
  EFI_STATUS                Status;
  LIST_ENTRY                *Link;
  BDS_COMMON_OPTION         *Option;
  EFI_HANDLE                ImageHandle;
  EFI_LOADED_IMAGE_PROTOCOL *ImageInfo;
  UINTN                     ExitDataSize;
  CHAR16                    *ExitData;
  BOOLEAN                   ReconnectAll;

  ReconnectAll = FALSE;

  //
  // Process the driver option
  //
  for (Link = BdsDriverLists->ForwardLink; Link != BdsDriverLists; Link = Link->ForwardLink) {
    Option = CR (Link, BDS_COMMON_OPTION, Link, BDS_LOAD_OPTION_SIGNATURE);
    
    //
    // If a load option is not marked as LOAD_OPTION_ACTIVE,
    // the boot manager will not automatically load the option.
    //
    if (!IS_LOAD_OPTION_TYPE (Option->Attribute, LOAD_OPTION_ACTIVE)) {
      continue;
    }
    
    //
    // If a driver load option is marked as LOAD_OPTION_FORCE_RECONNECT,
    // then all of the EFI drivers in the system will be disconnected and
    // reconnected after the last driver load option is processed.
    //
    if (IS_LOAD_OPTION_TYPE (Option->Attribute, LOAD_OPTION_FORCE_RECONNECT)) {
      ReconnectAll = TRUE;
    }
    
    //
    // Make sure the driver path is connected.
    //
    BdsLibConnectDevicePath (Option->DevicePath);

    //
    // Load and start the image that Driver#### describes
    //
    Status = gBS->LoadImage (
                    FALSE,
                    gImageHandle,
                    Option->DevicePath,
                    NULL,
                    0,
                    &ImageHandle
                    );

    if (!EFI_ERROR (Status)) {
      gBS->HandleProtocol (ImageHandle, &gEfiLoadedImageProtocolGuid, (VOID **) &ImageInfo);

      //
      // Verify whether this image is a driver, if not,
      // exit it and continue to parse next load option
      //
      if (ImageInfo->ImageCodeType != EfiBootServicesCode && ImageInfo->ImageCodeType != EfiRuntimeServicesCode) {
        gBS->Exit (ImageHandle, EFI_INVALID_PARAMETER, 0, NULL);
        continue;
      }

      if (Option->LoadOptionsSize != 0) {
        ImageInfo->LoadOptionsSize  = Option->LoadOptionsSize;
        ImageInfo->LoadOptions      = Option->LoadOptions;
      }
      //
      // Before calling the image, enable the Watchdog Timer for
      // the 5 Minute period
      //
      gBS->SetWatchdogTimer (5 * 60, 0x0000, 0x00, NULL);

      Status = gBS->StartImage (ImageHandle, &ExitDataSize, &ExitData);
      DEBUG ((DEBUG_INFO | DEBUG_LOAD, "Driver Return Status = %r\n", Status));

      //
      // Clear the Watchdog Timer after the image returns
      //
      gBS->SetWatchdogTimer (0x0000, 0x0000, 0x0000, NULL);
    }
  }
  
  //
  // Process the LOAD_OPTION_FORCE_RECONNECT driver option
  //
  if (ReconnectAll) {
    BdsLibDisconnectAllEfi ();
    BdsLibConnectAll ();
  }

}

/**
  Get the Option Number that does not used.
  Try to locate the specific option variable one by one utile find a free number.

  @param  VariableName          Indicate if the boot#### or driver#### option

  @return The Minimal Free Option Number

**/
UINT16
BdsLibGetFreeOptionNumber (
  IN  CHAR16    *VariableName
  )
{
  UINTN         Index;
  CHAR16        StrTemp[10];
  UINT16        *OptionBuffer;
  UINTN         OptionSize;

  //
  // Try to find the minimum free number from 0, 1, 2, 3....
  //
  Index = 0;
  do {
    if (*VariableName == 'B') {
      UnicodeSPrint (StrTemp, sizeof (StrTemp), L"Boot%04x", Index);
    } else {
      UnicodeSPrint (StrTemp, sizeof (StrTemp), L"Driver%04x", Index);
    }
    //
    // try if the option number is used
    //
    OptionBuffer = BdsLibGetVariableAndSize (
                     StrTemp,
                     &gEfiGlobalVariableGuid,
                     &OptionSize
                     );
    if (OptionBuffer == NULL) {
      break;
    }
    Index++;
  } while (TRUE);

  return ((UINT16) Index);
}


/**
  This function will register the new boot#### or driver#### option base on
  the VariableName. The new registered boot#### or driver#### will be linked
  to BdsOptionList and also update to the VariableName. After the boot#### or
  driver#### updated, the BootOrder or DriverOrder will also be updated.

  @param  BdsOptionList         The header of the boot#### or driver#### link list
  @param  DevicePath            The device path which the boot#### or driver####
                                option present
  @param  String                The description of the boot#### or driver####
  @param  VariableName          Indicate if the boot#### or driver#### option

  @retval EFI_SUCCESS           The boot#### or driver#### have been success
                                registered
  @retval EFI_STATUS            Return the status of gRT->SetVariable ().

**/
EFI_STATUS
EFIAPI
BdsLibRegisterNewOption (
  IN  LIST_ENTRY                     *BdsOptionList,
  IN  EFI_DEVICE_PATH_PROTOCOL       *DevicePath,
  IN  CHAR16                         *String,
  IN  CHAR16                         *VariableName
  )
{
  EFI_STATUS                Status;
  UINTN                     Index;
  UINT16                    RegisterOptionNumber;
  UINT16                    *TempOptionPtr;
  UINTN                     TempOptionSize;
  UINT16                    *OptionOrderPtr;
  VOID                      *OptionPtr;
  UINTN                     OptionSize;
  UINT8                     *TempPtr;
  EFI_DEVICE_PATH_PROTOCOL  *OptionDevicePath;
  CHAR16                    *Description;
  CHAR16                    OptionName[10];
  BOOLEAN                   UpdateDescription;
  UINT16                    BootOrderEntry;
  UINTN                     OrderItemNum;


  OptionPtr             = NULL;
  OptionSize            = 0;
  TempPtr               = NULL;
  OptionDevicePath      = NULL;
  Description           = NULL;
  OptionOrderPtr        = NULL;
  UpdateDescription     = FALSE;
  Status                = EFI_SUCCESS;
  ZeroMem (OptionName, sizeof (OptionName));

  TempOptionSize = 0;
  TempOptionPtr = BdsLibGetVariableAndSize (
                    VariableName,
                    &gEfiGlobalVariableGuid,
                    &TempOptionSize
                    );
  //
  // Compare with current option variable if the previous option is set in global variable.
  //
  for (Index = 0; Index < TempOptionSize / sizeof (UINT16); Index++) {
    //
    // TempOptionPtr must not be NULL if we have non-zero TempOptionSize.
    //
    ASSERT (TempOptionPtr != NULL);

    if (*VariableName == 'B') {
      UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", TempOptionPtr[Index]);
    } else {
      UnicodeSPrint (OptionName, sizeof (OptionName), L"Driver%04x", TempOptionPtr[Index]);
    }

    OptionPtr = BdsLibGetVariableAndSize (
                  OptionName,
                  &gEfiGlobalVariableGuid,
                  &OptionSize
                  );
    if (OptionPtr == NULL) {
      continue;
    }

    //
    // Validate the variable.
    //
    if (!ValidateOption(OptionPtr, OptionSize)) {
      continue;
    }

    TempPtr         =   OptionPtr;
    TempPtr         +=  sizeof (UINT32) + sizeof (UINT16);
    Description     =   (CHAR16 *) TempPtr;
    TempPtr         +=  StrSize ((CHAR16 *) TempPtr);
    OptionDevicePath =  (EFI_DEVICE_PATH_PROTOCOL *) TempPtr;

    //
    // Notes: the description may will change base on the GetStringToken
    //
    if (CompareMem (OptionDevicePath, DevicePath, GetDevicePathSize (OptionDevicePath)) == 0) {
      if (CompareMem (Description, String, StrSize (Description)) == 0) { 
        //
        // Got the option, so just return
        //
        FreePool (OptionPtr);
        FreePool (TempOptionPtr);
        return EFI_SUCCESS;
      } else {
        //
        // Option description changed, need update.
        //
        UpdateDescription = TRUE;
        FreePool (OptionPtr);
        break;
      }
    }

    FreePool (OptionPtr);
  }

  OptionSize          = sizeof (UINT32) + sizeof (UINT16) + StrSize (String);
  OptionSize          += GetDevicePathSize (DevicePath);
  OptionPtr           = AllocateZeroPool (OptionSize);
  ASSERT (OptionPtr != NULL);
  
  TempPtr             = OptionPtr;
  *(UINT32 *) TempPtr = LOAD_OPTION_ACTIVE;
  TempPtr             += sizeof (UINT32);
  *(UINT16 *) TempPtr = (UINT16) GetDevicePathSize (DevicePath);
  TempPtr             += sizeof (UINT16);
  CopyMem (TempPtr, String, StrSize (String));
  TempPtr             += StrSize (String);
  CopyMem (TempPtr, DevicePath, GetDevicePathSize (DevicePath));

  if (UpdateDescription) {
    //
    // The number in option#### to be updated. 
    // In this case, we must have non-NULL TempOptionPtr.
    //
    ASSERT (TempOptionPtr != NULL);
    RegisterOptionNumber = TempOptionPtr[Index];
  } else {
    //
    // The new option#### number
    //
    RegisterOptionNumber = BdsLibGetFreeOptionNumber(VariableName);
  }

  if (*VariableName == 'B') {
    UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", RegisterOptionNumber);
  } else {
    UnicodeSPrint (OptionName, sizeof (OptionName), L"Driver%04x", RegisterOptionNumber);
  }

  Status = gRT->SetVariable (
                  OptionName,
                  &gEfiGlobalVariableGuid,
                  EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
                  OptionSize,
                  OptionPtr
                  );
  //
  // Return if only need to update a changed description or fail to set option.
  //
  if (EFI_ERROR (Status) || UpdateDescription) {
    FreePool (OptionPtr);
    if (TempOptionPtr != NULL) {
      FreePool (TempOptionPtr);
    }
    return Status;
  }

  FreePool (OptionPtr);

  //
  // Update the option order variable
  //

  //
  // If no option order
  //
  if (TempOptionSize == 0) {
    BootOrderEntry = 0;
    Status = gRT->SetVariable (
                    VariableName,
                    &gEfiGlobalVariableGuid,
                    EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
                    sizeof (UINT16),
                    &BootOrderEntry
                    );
    if (TempOptionPtr != NULL) {
      FreePool (TempOptionPtr);
    }
    return Status;
  }
  
  //
  // TempOptionPtr must not be NULL if TempOptionSize is not zero.
  //
  ASSERT (TempOptionPtr != NULL);
  //
  // Append the new option number to the original option order
  //
  OrderItemNum = (TempOptionSize / sizeof (UINT16)) + 1 ;
  OptionOrderPtr = AllocateZeroPool ( OrderItemNum * sizeof (UINT16));
  ASSERT (OptionOrderPtr!= NULL);
  CopyMem (OptionOrderPtr, TempOptionPtr, (OrderItemNum - 1) * sizeof (UINT16));

  OptionOrderPtr[Index] = RegisterOptionNumber;

  Status = gRT->SetVariable (
                  VariableName,
                  &gEfiGlobalVariableGuid,
                  EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
                  OrderItemNum * sizeof (UINT16),
                  OptionOrderPtr
                  );
  FreePool (TempOptionPtr);
  FreePool (OptionOrderPtr);

  return Status;
}

/**
  Returns the size of a device path in bytes.

  This function returns the size, in bytes, of the device path data structure 
  specified by DevicePath including the end of device path node. If DevicePath 
  is NULL, then 0 is returned. If the length of the device path is bigger than
  MaxSize, also return 0 to indicate this is an invalidate device path.

  @param  DevicePath         A pointer to a device path data structure.
  @param  MaxSize            Max valid device path size. If big than this size, 
                             return error.
  
  @retval 0                  An invalid device path.
  @retval Others             The size of a device path in bytes.

**/
UINTN
GetDevicePathSizeEx (
  IN CONST EFI_DEVICE_PATH_PROTOCOL  *DevicePath,
  IN UINTN                           MaxSize
  )
{
  UINTN  Size;
  UINTN  NodeSize;

  if (DevicePath == NULL) {
    return 0;
  }

  //
  // Search for the end of the device path structure
  //
  Size = 0;
  while (!IsDevicePathEnd (DevicePath)) {
    NodeSize = DevicePathNodeLength (DevicePath);
    if (NodeSize < END_DEVICE_PATH_LENGTH) {
      return 0;
    }
    Size += NodeSize;
    if (Size > MaxSize) {
      return 0;
    }
    DevicePath = NextDevicePathNode (DevicePath);
  }
  Size += DevicePathNodeLength (DevicePath);
  if (Size > MaxSize) {
    return 0;
  }

  return Size;
}

/**
  Returns the length of a Null-terminated Unicode string. If the length is 
  bigger than MaxStringLen, return length 0 to indicate that this is an 
  invalidate string.

  This function returns the byte length of Unicode characters in the Null-terminated
  Unicode string specified by String. 

  If String is NULL, then ASSERT().
  If String is not aligned on a 16-bit boundary, then ASSERT().

  @param  String           A pointer to a Null-terminated Unicode string.
  @param  MaxStringLen     Max string len in this string.

  @retval 0                An invalid string.
  @retval Others           The length of String.

**/
UINTN
StrSizeEx (
  IN      CONST CHAR16              *String,
  IN      UINTN                     MaxStringLen
  )
{
  UINTN                             Length;

  ASSERT (String != NULL && MaxStringLen != 0);
  ASSERT (((UINTN) String & BIT0) == 0);

  for (Length = 0; *String != L'\0' && MaxStringLen != Length; String++, Length+=2);

  if (*String != L'\0' && MaxStringLen == Length) {
    return 0;
  }

  return Length + 2;
}

/**
  Validate the EFI Boot#### variable (VendorGuid/Name)

  @param  Variable              Boot#### variable data.
  @param  VariableSize          Returns the size of the EFI variable that was read

  @retval TRUE                  The variable data is correct.
  @retval FALSE                 The variable data is corrupted.

**/
BOOLEAN 
ValidateOption (
  UINT8                     *Variable,
  UINTN                     VariableSize
  )
{
  UINT16                    FilePathSize;
  UINT8                     *TempPtr;
  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
  UINTN                     TempSize;

  if (VariableSize <= sizeof (UINT16) + sizeof (UINT32)) {
    return FALSE;
  }

  //
  // Skip the option attribute
  //
  TempPtr    = Variable;
  TempPtr   += sizeof (UINT32);

  //
  // Get the option's device path size
  //
  FilePathSize  = *(UINT16 *) TempPtr;
  TempPtr      += sizeof (UINT16);

  //
  // Get the option's description string size
  //
  TempSize = StrSizeEx ((CHAR16 *) TempPtr, VariableSize - sizeof (UINT16) - sizeof (UINT32));
  TempPtr += TempSize;

  //
  // Get the option's device path
  //
  DevicePath =  (EFI_DEVICE_PATH_PROTOCOL *) TempPtr;
  TempPtr   += FilePathSize;

  //
  // Validation boot option variable.
  //
  if ((FilePathSize == 0) || (TempSize == 0)) {
    return FALSE;
  }

  if (TempSize + FilePathSize + sizeof (UINT16) + sizeof (UINT32) > VariableSize) {
    return FALSE;
  }

  return (BOOLEAN) (GetDevicePathSizeEx (DevicePath, FilePathSize) != 0);
}

/**
  Convert a single character to number.
  It assumes the input Char is in the scope of L'0' ~ L'9' and L'A' ~ L'F'
  
  @param Char    The input char which need to change to a hex number.
  
**/
UINTN
CharToUint (
  IN CHAR16                           Char
  )
{
  if ((Char >= L'0') && (Char <= L'9')) {
    return (UINTN) (Char - L'0');
  }

  if ((Char >= L'A') && (Char <= L'F')) {
    return (UINTN) (Char - L'A' + 0xA);
  }

  ASSERT (FALSE);
  return 0;
}

/**
  Build the boot#### or driver#### option from the VariableName, the
  build boot#### or driver#### will also be linked to BdsCommonOptionList.

  @param  BdsCommonOptionList   The header of the boot#### or driver#### option
                                link list
  @param  VariableName          EFI Variable name indicate if it is boot#### or
                                driver####

  @retval BDS_COMMON_OPTION     Get the option just been created
  @retval NULL                  Failed to get the new option

**/
BDS_COMMON_OPTION *
EFIAPI
BdsLibVariableToOption (
  IN OUT LIST_ENTRY                   *BdsCommonOptionList,
  IN  CHAR16                          *VariableName
  )
{
  UINT32                    Attribute;
  UINT16                    FilePathSize;
  UINT8                     *Variable;
  UINT8                     *TempPtr;
  UINTN                     VariableSize;
  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
  BDS_COMMON_OPTION         *Option;
  VOID                      *LoadOptions;
  UINT32                    LoadOptionsSize;
  CHAR16                    *Description;
  UINT8                     NumOff;

  //
  // Read the variable. We will never free this data.
  //
  Variable = BdsLibGetVariableAndSize (
              VariableName,
              &gEfiGlobalVariableGuid,
              &VariableSize
              );
  if (Variable == NULL) {
    return NULL;
  }

  //
  // Validate Boot#### variable data.
  //
  if (!ValidateOption(Variable, VariableSize)) {
    return NULL;
  }

  //
  // Notes: careful defined the variable of Boot#### or
  // Driver####, consider use some macro to abstract the code
  //
  //
  // Get the option attribute
  //
  TempPtr   =  Variable;
  Attribute =  *(UINT32 *) Variable;
  TempPtr   += sizeof (UINT32);

  //
  // Get the option's device path size
  //
  FilePathSize =  *(UINT16 *) TempPtr;
  TempPtr      += sizeof (UINT16);

  //
  // Get the option's description string
  //
  Description = (CHAR16 *) TempPtr;

  //
  // Get the option's description string size
  //
  TempPtr += StrSize((CHAR16 *) TempPtr);

  //
  // Get the option's device path
  //
  DevicePath =  (EFI_DEVICE_PATH_PROTOCOL *) TempPtr;
  TempPtr    += FilePathSize;

  //
  // Get load opion data.
  //
  LoadOptions     = TempPtr;
  LoadOptionsSize = (UINT32) (VariableSize - (UINTN) (TempPtr - Variable));

  //
  // The Console variables may have multiple device paths, so make
  // an Entry for each one.
  //
  Option = AllocateZeroPool (sizeof (BDS_COMMON_OPTION));
  if (Option == NULL) {
    return NULL;
  }

  Option->Signature   = BDS_LOAD_OPTION_SIGNATURE;
  Option->DevicePath  = AllocateZeroPool (GetDevicePathSize (DevicePath));
  ASSERT(Option->DevicePath != NULL);
  CopyMem (Option->DevicePath, DevicePath, GetDevicePathSize (DevicePath));

  Option->Attribute   = Attribute;
  Option->Description = AllocateZeroPool (StrSize (Description));
  ASSERT(Option->Description != NULL);
  CopyMem (Option->Description, Description, StrSize (Description));

  Option->LoadOptions = AllocateZeroPool (LoadOptionsSize);
  ASSERT(Option->LoadOptions != NULL);
  CopyMem (Option->LoadOptions, LoadOptions, LoadOptionsSize);
  Option->LoadOptionsSize = LoadOptionsSize;

  //
  // Get the value from VariableName Unicode string
  // since the ISO standard assumes ASCII equivalent abbreviations, we can be safe in converting this
  // Unicode stream to ASCII without any loss in meaning.
  //
  if (*VariableName == 'B') {
    NumOff = (UINT8) (sizeof (L"Boot") / sizeof (CHAR16) - 1);
    Option->BootCurrent = (UINT16) (CharToUint (VariableName[NumOff+0]) * 0x1000) 
               + (UINT16) (CharToUint (VariableName[NumOff+1]) * 0x100)
               + (UINT16) (CharToUint (VariableName[NumOff+2]) * 0x10)
               + (UINT16) (CharToUint (VariableName[NumOff+3]) * 0x1);
  }
  InsertTailList (BdsCommonOptionList, &Option->Link);
  FreePool (Variable);
  return Option;
}

/**
  Process BootOrder, or DriverOrder variables, by calling
  BdsLibVariableToOption () for each UINT16 in the variables.

  @param  BdsCommonOptionList   The header of the option list base on variable
                                VariableName
  @param  VariableName          EFI Variable name indicate the BootOrder or
                                DriverOrder

  @retval EFI_SUCCESS           Success create the boot option or driver option
                                list
  @retval EFI_OUT_OF_RESOURCES  Failed to get the boot option or driver option list

**/
EFI_STATUS
EFIAPI
BdsLibBuildOptionFromVar (
  IN  LIST_ENTRY                      *BdsCommonOptionList,
  IN  CHAR16                          *VariableName
  )
{
  UINT16            *OptionOrder;
  UINTN             OptionOrderSize;
  UINTN             Index;
  BDS_COMMON_OPTION *Option;
  CHAR16            OptionName[20];

  //
  // Zero Buffer in order to get all BOOT#### variables
  //
  ZeroMem (OptionName, sizeof (OptionName));

  //
  // Read the BootOrder, or DriverOrder variable.
  //
  OptionOrder = BdsLibGetVariableAndSize (
                  VariableName,
                  &gEfiGlobalVariableGuid,
                  &OptionOrderSize
                  );
  if (OptionOrder == NULL) {
    return EFI_OUT_OF_RESOURCES;
  }

  for (Index = 0; Index < OptionOrderSize / sizeof (UINT16); Index++) {
    if (*VariableName == 'B') {
      UnicodeSPrint (OptionName, sizeof (OptionName), L"Boot%04x", OptionOrder[Index]);
    } else {
      UnicodeSPrint (OptionName, sizeof (OptionName), L"Driver%04x", OptionOrder[Index]);
    }

    Option              = BdsLibVariableToOption (BdsCommonOptionList, OptionName);
    if (Option != NULL) {
      Option->BootCurrent = OptionOrder[Index];
    }
  }

  FreePool (OptionOrder);

  return EFI_SUCCESS;
}

/**
  Get boot mode by looking up configuration table and parsing HOB list

  @param  BootMode              Boot mode from PEI handoff HOB.

  @retval EFI_SUCCESS           Successfully get boot mode

**/
EFI_STATUS
EFIAPI
BdsLibGetBootMode (
  OUT EFI_BOOT_MODE       *BootMode
  )
{
  *BootMode = GetBootModeHob ();

  return EFI_SUCCESS;
}

/**
  Read the EFI variable (VendorGuid/Name) and return a dynamically allocated
  buffer, and the size of the buffer. If failure return NULL.

  @param  Name                  String part of EFI variable name
  @param  VendorGuid            GUID part of EFI variable name
  @param  VariableSize          Returns the size of the EFI variable that was read

  @return                       Dynamically allocated memory that contains a copy of the EFI variable
                                Caller is responsible freeing the buffer.
  @retval NULL                  Variable was not read

**/
VOID *
EFIAPI
BdsLibGetVariableAndSize (
  IN  CHAR16              *Name,
  IN  EFI_GUID            *VendorGuid,
  OUT UINTN               *VariableSize
  )
{
  EFI_STATUS  Status;
  UINTN       BufferSize;
  VOID        *Buffer;

  Buffer = NULL;

  //
  // Pass in a zero size buffer to find the required buffer size.
  //
  BufferSize  = 0;
  Status      = gRT->GetVariable (Name, VendorGuid, NULL, &BufferSize, Buffer);
  if (Status == EFI_BUFFER_TOO_SMALL) {
    //
    // Allocate the buffer to return
    //
    Buffer = AllocateZeroPool (BufferSize);
    if (Buffer == NULL) {
      *VariableSize = 0;
      return NULL;
    }
    //
    // Read variable into the allocated buffer.
    //
    Status = gRT->GetVariable (Name, VendorGuid, NULL, &BufferSize, Buffer);
    if (EFI_ERROR (Status)) {
      FreePool (Buffer);
      BufferSize = 0;
      Buffer     = NULL;
    }
  }

  ASSERT (((Buffer == NULL) && (BufferSize == 0)) ||
          ((Buffer != NULL) && (BufferSize != 0))
          );
  *VariableSize = BufferSize;
  return Buffer;
}

/**
  Delete the instance in Multi which matches partly with Single 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.

  @return This function will remove the device path instances in Multi which partly
          match with the Single, and return the result device path. If there is no
          remaining device path as a result, this function will return NULL.

**/
EFI_DEVICE_PATH_PROTOCOL *
EFIAPI
BdsLibDelPartMatchInstance (
  IN     EFI_DEVICE_PATH_PROTOCOL  *Multi,
  IN     EFI_DEVICE_PATH_PROTOCOL  *Single
  )
{
  EFI_DEVICE_PATH_PROTOCOL  *Instance;
  EFI_DEVICE_PATH_PROTOCOL  *NewDevicePath;
  EFI_DEVICE_PATH_PROTOCOL  *TempNewDevicePath;
  UINTN                     InstanceSize;
  UINTN                     SingleDpSize;
  UINTN                     Size;

  NewDevicePath     = NULL;
  TempNewDevicePath = NULL;

  if (Multi == NULL || Single == NULL) {
    return Multi;
  }

  Instance        =  GetNextDevicePathInstance (&Multi, &InstanceSize);
  SingleDpSize    =  GetDevicePathSize (Single) - END_DEVICE_PATH_LENGTH;
  InstanceSize    -= END_DEVICE_PATH_LENGTH;

  while (Instance != NULL) {

    Size = (SingleDpSize < InstanceSize) ? SingleDpSize : InstanceSize;

    if ((CompareMem (Instance, Single, Size) != 0)) {
      //
      // Append the device path instance which does not match with Single
      //
      TempNewDevicePath = NewDevicePath;
      NewDevicePath = AppendDevicePathInstance (NewDevicePath, Instance);
      if (TempNewDevicePath != NULL) {
        FreePool(TempNewDevicePath);
      }
    }
    FreePool(Instance);
    Instance = GetNextDevicePathInstance (&Multi, &InstanceSize);
    InstanceSize  -= END_DEVICE_PATH_LENGTH;
  }

  return NewDevicePath;
}

/**
  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.

  @retval TRUE                  If the Single device path is contained within Multi device path.
  @retval FALSE                 The Single device path is not match within Multi device path.

**/
BOOLEAN
EFIAPI
BdsLibMatchDevicePaths (
  IN  EFI_DEVICE_PATH_PROTOCOL  *Multi,
  IN  EFI_DEVICE_PATH_PROTOCOL  *Single
  )
{
  EFI_DEVICE_PATH_PROTOCOL  *DevicePath;
  EFI_DEVICE_PATH_PROTOCOL  *DevicePathInst;
  UINTN                     Size;

  if (Multi == NULL || Single  == NULL) {
    return FALSE;
  }

  DevicePath      = Multi;
  DevicePathInst  = GetNextDevicePathInstance (&DevicePath, &Size);

  //
  // Search for the match of 'Single' in 'Multi'
  //
  while (DevicePathInst != NULL) {
    //
    // If the single device path is found in multiple device paths,
    // return success
    //
    if (CompareMem (Single, DevicePathInst, Size) == 0) {
      FreePool (DevicePathInst);
      return TRUE;
    }

    FreePool (DevicePathInst);
    DevicePathInst = GetNextDevicePathInstance (&DevicePath, &Size);
  }

  return FALSE;
}

/**
  This function prints a series of strings.

  @param  ConOut                Pointer to EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL
  @param  ...                   A variable argument list containing series of
                                strings, the last string must be NULL.

  @retval EFI_SUCCESS           Success print out the string using ConOut.
  @retval EFI_STATUS            Return the status of the ConOut->OutputString ().

**/
EFI_STATUS
EFIAPI
BdsLibOutputStrings (
  IN EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL   *ConOut,
  ...
  )
{
  VA_LIST     Args;
  EFI_STATUS  Status;
  CHAR16      *String;

  Status = EFI_SUCCESS;
  VA_START (Args, ConOut);

  while (!EFI_ERROR (Status)) {
    //
    // If String is NULL, then it's the end of the list
    //
    String = VA_ARG (Args, CHAR16 *);
    if (String == NULL) {
      break;
    }

    Status = ConOut->OutputString (ConOut, String);

    if (EFI_ERROR (Status)) {
      break;
    }
  }
  
  VA_END(Args);
  return Status;
}

//
//  Following are BDS Lib functions which contain all the code about setup browser reset reminder feature.
//  Setup Browser reset reminder feature is that an reset reminder will be given before user leaves the setup browser  if
//  user change any option setting which needs a reset to be effective, and  the reset will be applied according to  the user selection.
//


/**
  Enable the setup browser reset reminder feature.
  This routine is used in platform tip. If the platform policy need the feature, use the routine to enable it.

**/
VOID
EFIAPI
EnableResetReminderFeature (
  VOID
  )
{
  mFeaturerSwitch = TRUE;
}


/**
  Disable the setup browser reset reminder feature.
  This routine is used in platform tip. If the platform policy do not want the feature, use the routine to disable it.

**/
VOID
EFIAPI
DisableResetReminderFeature (
  VOID
  )
{
  mFeaturerSwitch = FALSE;
}


/**
  Record the info that  a reset is required.
  A  module boolean variable is used to record whether a reset is required.

**/
VOID
EFIAPI
EnableResetRequired (
  VOID
  )
{
  mResetRequired = TRUE;
}


/**
  Record the info that  no reset is required.
  A  module boolean variable is used to record whether a reset is required.

**/
VOID
EFIAPI
DisableResetRequired (
  VOID
  )
{
  mResetRequired = FALSE;
}


/**
  Check whether platform policy enable the reset reminder feature. The default is enabled.

**/
BOOLEAN
EFIAPI
IsResetReminderFeatureEnable (
  VOID
  )
{
  return mFeaturerSwitch;
}


/**
  Check if  user changed any option setting which needs a system reset to be effective.

**/
BOOLEAN
EFIAPI
IsResetRequired (
  VOID
  )
{
  return mResetRequired;
}


/**
  Check whether a reset is needed, and finish the reset reminder feature.
  If a reset is needed, Popup a menu to notice user, and finish the feature
  according to the user selection.

**/
VOID
EFIAPI
SetupResetReminder (
  VOID
  )
{
  EFI_INPUT_KEY                 Key;
  CHAR16                        *StringBuffer1;
  CHAR16                        *StringBuffer2;


  //
  //check any reset required change is applied? if yes, reset system
  //
  if (IsResetReminderFeatureEnable ()) {
    if (IsResetRequired ()) {

      StringBuffer1 = AllocateZeroPool (MAX_STRING_LEN * sizeof (CHAR16));
      ASSERT (StringBuffer1 != NULL);
      StringBuffer2 = AllocateZeroPool (MAX_STRING_LEN * sizeof (CHAR16));
      ASSERT (StringBuffer2 != NULL);
      StrCpy (StringBuffer1, L"Configuration changed. Reset to apply it Now.");
      StrCpy (StringBuffer2, L"Press ENTER to reset");
      //
      // Popup a menu to notice user
      //
      do {
        CreatePopUp (EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE, &Key, StringBuffer1, StringBuffer2, NULL);
      } while (Key.UnicodeChar != CHAR_CARRIAGE_RETURN);

      FreePool (StringBuffer1);
      FreePool (StringBuffer2);

      gRT->ResetSystem (EfiResetCold, EFI_SUCCESS, 0, NULL);
    }
  }
}

/**
  Get the headers (dos, image, optional header) from an image

  @param  Device                SimpleFileSystem device handle
  @param  FileName              File name for the image
  @param  DosHeader             Pointer to dos header
  @param  Hdr                   The buffer in which to return the PE32, PE32+, or TE header.

  @retval EFI_SUCCESS           Successfully get the machine type.
  @retval EFI_NOT_FOUND         The file is not found.
  @retval EFI_LOAD_ERROR        File is not a valid image file.

**/
EFI_STATUS
EFIAPI
BdsLibGetImageHeader (
  IN  EFI_HANDLE                  Device,
  IN  CHAR16                      *FileName,
  OUT EFI_IMAGE_DOS_HEADER        *DosHeader,
  OUT EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION   Hdr
  )
{
  EFI_STATUS                       Status;
  EFI_SIMPLE_FILE_SYSTEM_PROTOCOL  *Volume;
  EFI_FILE_HANDLE                  Root;
  EFI_FILE_HANDLE                  ThisFile;
  UINTN                            BufferSize;
  UINT64                           FileSize;
  EFI_FILE_INFO                    *Info;

  Root     = NULL;
  ThisFile = NULL;
  //
  // Handle the file system interface to the device
  //
  Status = gBS->HandleProtocol (
                  Device,
                  &gEfiSimpleFileSystemProtocolGuid,
                  (VOID *) &Volume
                  );
  if (EFI_ERROR (Status)) {
    goto Done;
  }

  Status = Volume->OpenVolume (
                     Volume,
                     &Root
                     );
  if (EFI_ERROR (Status)) {
    Root = NULL;
    goto Done;
  }
  ASSERT (Root != NULL);
  Status = Root->Open (Root, &ThisFile, FileName, EFI_FILE_MODE_READ, 0);
  if (EFI_ERROR (Status)) {
    goto Done;
  }
  ASSERT (ThisFile != NULL);

  //
  // Get file size
  //
  BufferSize  = SIZE_OF_EFI_FILE_INFO + 200;
  do {
    Info   = NULL;
    Status = gBS->AllocatePool (EfiBootServicesData, BufferSize, (VOID **) &Info);
    if (EFI_ERROR (Status)) {
      goto Done;
    }
    Status = ThisFile->GetInfo (
                         ThisFile,
                         &gEfiFileInfoGuid,
                         &BufferSize,
                         Info
                         );
    if (!EFI_ERROR (Status)) {
      break;
    }
    if (Status != EFI_BUFFER_TOO_SMALL) {
      FreePool (Info);
      goto Done;
    }
    FreePool (Info);
  } while (TRUE);

  FileSize = Info->FileSize;
  FreePool (Info);

  //
  // Read dos header
  //
  BufferSize = sizeof (EFI_IMAGE_DOS_HEADER);
  Status = ThisFile->Read (ThisFile, &BufferSize, DosHeader);
  if (EFI_ERROR (Status) ||
      BufferSize < sizeof (EFI_IMAGE_DOS_HEADER) ||
      FileSize <= DosHeader->e_lfanew ||
      DosHeader->e_magic != EFI_IMAGE_DOS_SIGNATURE) {
    Status = EFI_LOAD_ERROR;
    goto Done;
  }

  //
  // Move to PE signature
  //
  Status = ThisFile->SetPosition (ThisFile, DosHeader->e_lfanew);
  if (EFI_ERROR (Status)) {
    Status = EFI_LOAD_ERROR;
    goto Done;
  }

  //
  // Read and check PE signature
  //
  BufferSize = sizeof (EFI_IMAGE_OPTIONAL_HEADER_UNION);
  Status = ThisFile->Read (ThisFile, &BufferSize, Hdr.Pe32);
  if (EFI_ERROR (Status) ||
      BufferSize < sizeof (EFI_IMAGE_OPTIONAL_HEADER_UNION) ||
      Hdr.Pe32->Signature != EFI_IMAGE_NT_SIGNATURE) {
    Status = EFI_LOAD_ERROR;
    goto Done;
  }

  //
  // Check PE32 or PE32+ magic
  //
  if (Hdr.Pe32->OptionalHeader.Magic != EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC &&
      Hdr.Pe32->OptionalHeader.Magic != EFI_IMAGE_NT_OPTIONAL_HDR64_MAGIC) {
    Status = EFI_LOAD_ERROR;
    goto Done;
  }

 Done:
  if (ThisFile != NULL) {
    ThisFile->Close (ThisFile);
  }
  if (Root != NULL) {
    Root->Close (Root);
  }
  return Status;
}

/**
  This routine adjust the memory information for different memory type and 
  save them into the variables for next boot.
**/
VOID
BdsSetMemoryTypeInformationVariable (
  VOID
  )
{
  EFI_STATUS                   Status;
  EFI_MEMORY_TYPE_INFORMATION  *PreviousMemoryTypeInformation;
  EFI_MEMORY_TYPE_INFORMATION  *CurrentMemoryTypeInformation;
  UINTN                        VariableSize;
  UINTN                        Index;
  UINTN                        Index1;
  UINT32                       Previous;
  UINT32                       Current;
  UINT32                       Next;
  EFI_HOB_GUID_TYPE            *GuidHob;
  BOOLEAN                      MemoryTypeInformationModified;
  BOOLEAN                      MemoryTypeInformationVariableExists;
  EFI_BOOT_MODE                BootMode;

  MemoryTypeInformationModified       = FALSE;
  MemoryTypeInformationVariableExists = FALSE;


  BootMode = GetBootModeHob ();
  //
  // In BOOT_IN_RECOVERY_MODE, Variable region is not reliable.
  //
  if (BootMode == BOOT_IN_RECOVERY_MODE) {
    return;
  }

  //
  // Only check the the Memory Type Information variable in the boot mode 
  // other than BOOT_WITH_DEFAULT_SETTINGS because the Memory Type
  // Information is not valid in this boot mode.
  //
  if (BootMode != BOOT_WITH_DEFAULT_SETTINGS) {
    VariableSize = 0;
    Status = gRT->GetVariable (
                    EFI_MEMORY_TYPE_INFORMATION_VARIABLE_NAME,
                    &gEfiMemoryTypeInformationGuid,
                    NULL, 
                    &VariableSize, 
                    NULL
                    );
    if (Status == EFI_BUFFER_TOO_SMALL) {
      MemoryTypeInformationVariableExists = TRUE;
    }
  }

  //
  // Retrieve the current memory usage statistics.  If they are not found, then
  // no adjustments can be made to the Memory Type Information variable.
  //
  Status = EfiGetSystemConfigurationTable (
             &gEfiMemoryTypeInformationGuid,
             (VOID **) &CurrentMemoryTypeInformation
             );
  if (EFI_ERROR (Status) || CurrentMemoryTypeInformation == NULL) {
    return;
  }

  //
  // Get the Memory Type Information settings from Hob if they exist,
  // PEI is responsible for getting them from variable and build a Hob to save them.
  // If the previous Memory Type Information is not available, then set defaults
  //
  GuidHob = GetFirstGuidHob (&gEfiMemoryTypeInformationGuid);
  if (GuidHob == NULL) {
    //
    // If Platform has not built Memory Type Info into the Hob, just return.
    //
    return;
  }
  PreviousMemoryTypeInformation = GET_GUID_HOB_DATA (GuidHob);
  VariableSize = GET_GUID_HOB_DATA_SIZE (GuidHob);

  //
  // Use a heuristic to adjust the Memory Type Information for the next boot
  //
  DEBUG ((EFI_D_INFO, "Memory  Previous  Current    Next   \n"));
  DEBUG ((EFI_D_INFO, " Type    Pages     Pages     Pages  \n"));
  DEBUG ((EFI_D_INFO, "======  ========  ========  ========\n"));

  for (Index = 0; PreviousMemoryTypeInformation[Index].Type != EfiMaxMemoryType; Index++) {

    for (Index1 = 0; CurrentMemoryTypeInformation[Index1].Type != EfiMaxMemoryType; Index1++) {
      if (PreviousMemoryTypeInformation[Index].Type == CurrentMemoryTypeInformation[Index1].Type) {
        break;
      }
    }
    if (CurrentMemoryTypeInformation[Index1].Type == EfiMaxMemoryType) {
      continue;
    }

    //
    // Previous is the number of pages pre-allocated
    // Current is the number of pages actually needed
    //
    Previous = PreviousMemoryTypeInformation[Index].NumberOfPages;
    Current  = CurrentMemoryTypeInformation[Index1].NumberOfPages;
    Next     = Previous;

    //
    // Inconsistent Memory Reserved across bootings may lead to S4 fail
    // Write next varible to 125% * current when the pre-allocated memory is:
    //  1. More than 150% of needed memory and boot mode is BOOT_WITH_DEFAULT_SETTING
    //  2. Less than the needed memory
    //
    if ((Current + (Current >> 1)) < Previous) {
      if (BootMode == BOOT_WITH_DEFAULT_SETTINGS) {
        Next = Current + (Current >> 2);
      }
    } else if (Current > Previous) {
      Next = Current + (Current >> 2);
    }
    if (Next > 0 && Next < 4) {
      Next = 4;
    }

    if (Next != Previous) {
      PreviousMemoryTypeInformation[Index].NumberOfPages = Next;
      MemoryTypeInformationModified = TRUE;
    }

    DEBUG ((EFI_D_INFO, "  %02x    %08x  %08x  %08x\n", PreviousMemoryTypeInformation[Index].Type, Previous, Current, Next));
  }

  //
  // If any changes were made to the Memory Type Information settings, then set the new variable value;
  // Or create the variable in first boot.
  //
  if (MemoryTypeInformationModified || !MemoryTypeInformationVariableExists) {
    Status = SetVariableAndReportStatusCodeOnError (
               EFI_MEMORY_TYPE_INFORMATION_VARIABLE_NAME,
               &gEfiMemoryTypeInformationGuid,
               EFI_VARIABLE_NON_VOLATILE  | EFI_VARIABLE_BOOTSERVICE_ACCESS,
               VariableSize,
               PreviousMemoryTypeInformation
               );

    if (!EFI_ERROR (Status)) {
      //
      // If the Memory Type Information settings have been modified, then reset the platform
      // so the new Memory Type Information setting will be used to guarantee that an S4
      // entry/resume cycle will not fail.
      //
      if (MemoryTypeInformationModified && PcdGetBool (PcdResetOnMemoryTypeInformationChange)) {
        DEBUG ((EFI_D_INFO, "Memory Type Information settings change. Warm Reset!!!\n"));
        gRT->ResetSystem (EfiResetWarm, EFI_SUCCESS, 0, NULL);
      }
    } else {
      DEBUG ((EFI_D_ERROR, "Memory Type Information settings cannot be saved. OS S4 may fail!\n"));
    }
  }
}

/**
  This routine is kept for backward compatibility.
**/
VOID
EFIAPI
BdsLibSaveMemoryTypeInformation (
  VOID
  )
{
}


/**
  Identify a user and, if authenticated, returns the current user profile handle.

  @param[out]  User           Point to user profile handle.
  
  @retval EFI_SUCCESS         User is successfully identified, or user identification
                              is not supported.
  @retval EFI_ACCESS_DENIED   User is not successfully identified

**/
EFI_STATUS
EFIAPI
BdsLibUserIdentify (
  OUT EFI_USER_PROFILE_HANDLE         *User
  )
{
  EFI_STATUS                          Status;
  EFI_USER_MANAGER_PROTOCOL           *Manager;
  
  Status = gBS->LocateProtocol (
                  &gEfiUserManagerProtocolGuid,
                  NULL,
                  (VOID **) &Manager
                  );
  if (EFI_ERROR (Status)) {
    return EFI_SUCCESS;
  }

  return Manager->Identify (Manager, User);
}

/**
  Set the variable and report the error through status code upon failure.

  @param  VariableName           A Null-terminated string that is the name of the vendor's variable.
                                 Each VariableName is unique for each VendorGuid. VariableName must
                                 contain 1 or more characters. If VariableName is an empty string,
                                 then EFI_INVALID_PARAMETER is returned.
  @param  VendorGuid             A unique identifier for the vendor.
  @param  Attributes             Attributes bitmask to set for the variable.
  @param  DataSize               The size in bytes of the Data buffer. Unless the EFI_VARIABLE_APPEND_WRITE, 
                                 EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS, or 
                                 EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS attribute is set, a size of zero 
                                 causes the variable to be deleted. When the EFI_VARIABLE_APPEND_WRITE attribute is 
                                 set, then a SetVariable() call with a DataSize of zero will not cause any change to 
                                 the variable value (the timestamp associated with the variable may be updated however 
                                 even if no new data value is provided,see the description of the 
                                 EFI_VARIABLE_AUTHENTICATION_2 descriptor below. In this case the DataSize will not 
                                 be zero since the EFI_VARIABLE_AUTHENTICATION_2 descriptor will be populated). 
  @param  Data                   The contents for the variable.

  @retval EFI_SUCCESS            The firmware has successfully stored the variable and its data as
                                 defined by the Attributes.
  @retval EFI_INVALID_PARAMETER  An invalid combination of attribute bits, name, and GUID was supplied, or the
                                 DataSize exceeds the maximum allowed.
  @retval EFI_INVALID_PARAMETER  VariableName is an empty string.
  @retval EFI_OUT_OF_RESOURCES   Not enough storage is available to hold the variable and its data.
  @retval EFI_DEVICE_ERROR       The variable could not be retrieved due to a hardware error.
  @retval EFI_WRITE_PROTECTED    The variable in question is read-only.
  @retval EFI_WRITE_PROTECTED    The variable in question cannot be deleted.
  @retval EFI_SECURITY_VIOLATION The variable could not be written due to EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS 
                                 or EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACESS being set, but the AuthInfo 
                                 does NOT pass the validation check carried out by the firmware.

  @retval EFI_NOT_FOUND          The variable trying to be updated or deleted was not found.
**/
EFI_STATUS
SetVariableAndReportStatusCodeOnError (
  IN CHAR16     *VariableName,
  IN EFI_GUID   *VendorGuid,
  IN UINT32     Attributes,
  IN UINTN      DataSize,
  IN VOID       *Data
  )
{
  EFI_STATUS                 Status;
  EDKII_SET_VARIABLE_STATUS  *SetVariableStatus;
  UINTN                      NameSize;

  Status = gRT->SetVariable (
                  VariableName,
                  VendorGuid,
                  Attributes,
                  DataSize,
                  Data
                  );
  if (EFI_ERROR (Status)) {
    NameSize = StrSize (VariableName);
    SetVariableStatus = AllocatePool (sizeof (EDKII_SET_VARIABLE_STATUS) + NameSize + DataSize);
    if (SetVariableStatus != NULL) {
      CopyGuid (&SetVariableStatus->Guid, VendorGuid);
      SetVariableStatus->NameSize   = NameSize;
      SetVariableStatus->DataSize   = DataSize;
      SetVariableStatus->SetStatus  = Status;
      SetVariableStatus->Attributes = Attributes;
      CopyMem (SetVariableStatus + 1,                          VariableName, NameSize);
      CopyMem (((UINT8 *) (SetVariableStatus + 1)) + NameSize, Data,         DataSize);

      REPORT_STATUS_CODE_EX (
        EFI_ERROR_CODE,
        PcdGet32 (PcdErrorCodeSetVariable),
        0,
        NULL,
        &gEdkiiStatusCodeDataTypeVariableGuid,
        SetVariableStatus,
        sizeof (EDKII_SET_VARIABLE_STATUS) + NameSize + DataSize
        );

      FreePool (SetVariableStatus);
    }
  }

  return Status;
}