summaryrefslogtreecommitdiff
path: root/PcAtChipsetPkg/PciHostBridgeDxe/PciHostBridge.c
blob: aa02641d8ae8346d919f5f22db092acea5f2e2b5 (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
/** @file
  Provides the basic interfaces to abstract a PCI Host Bridge Resource
  Allocation

  Copyright (c) 2008 - 2013, 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 "PciHostBridge.h"

//
// Hard code: Root Bridge Number within the host bridge
//            Root Bridge's attribute
//            Root Bridge's device path
//            Root Bridge's resource aperture
//
UINTN RootBridgeNumber[1] = { 1 };

UINT64 RootBridgeAttribute[1][1] = {
  { EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM }
};

EFI_PCI_ROOT_BRIDGE_DEVICE_PATH mEfiPciRootBridgeDevicePath[1][1] = {
  {
    {
      {
        {
          ACPI_DEVICE_PATH,
          ACPI_DP,
          {
            (UINT8) (sizeof(ACPI_HID_DEVICE_PATH)),
            (UINT8) ((sizeof(ACPI_HID_DEVICE_PATH)) >> 8)
          }
        },
        EISA_PNP_ID(0x0A03),
        0
      },

      {
        END_DEVICE_PATH_TYPE,
        END_ENTIRE_DEVICE_PATH_SUBTYPE,
        {
          END_DEVICE_PATH_LENGTH,
          0
        }
      }
    }
  }
};

PCI_ROOT_BRIDGE_RESOURCE_APERTURE  mResAperture[1][1] = {
  {{0, 0xff, 0x80000000, 0xffffffff, 0, 0xffff}}
};

EFI_HANDLE mDriverImageHandle;

PCI_HOST_BRIDGE_INSTANCE mPciHostBridgeInstanceTemplate = {
  PCI_HOST_BRIDGE_SIGNATURE,  // Signature
  NULL,                       // HostBridgeHandle
  0,                          // RootBridgeNumber
  {NULL, NULL},               // Head
  FALSE,                      // ResourceSubiteed
  TRUE,                       // CanRestarted
  {
    NotifyPhase,
    GetNextRootBridge,
    GetAttributes,
    StartBusEnumeration,
    SetBusNumbers,
    SubmitResources,
    GetProposedResources,
    PreprocessController
  }
};

//
// Implementation
//

/**
  Entry point of this driver

  @param ImageHandle     Handle of driver image
  @param SystemTable     Point to EFI_SYSTEM_TABLE

  @retval EFI_OUT_OF_RESOURCES  Can not allocate memory resource
  @retval EFI_DEVICE_ERROR      Can not install the protocol instance
  @retval EFI_SUCCESS           Success to initialize the Pci host bridge.
**/
EFI_STATUS
EFIAPI
InitializePciHostBridge (
  IN EFI_HANDLE        ImageHandle,
  IN EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS                  Status;
  UINTN                       Loop1;
  UINTN                       Loop2;
  PCI_HOST_BRIDGE_INSTANCE    *HostBridge;
  PCI_ROOT_BRIDGE_INSTANCE    *PrivateData;

  mDriverImageHandle = ImageHandle;

  //
  // Create Host Bridge Device Handle
  //
  for (Loop1 = 0; Loop1 < HOST_BRIDGE_NUMBER; Loop1++) {
    HostBridge = AllocateCopyPool (sizeof(PCI_HOST_BRIDGE_INSTANCE),
                   &mPciHostBridgeInstanceTemplate);
    if (HostBridge == NULL) {
      return EFI_OUT_OF_RESOURCES;
    }

    HostBridge->RootBridgeNumber = RootBridgeNumber[Loop1];
    InitializeListHead (&HostBridge->Head);

    Status = gBS->InstallMultipleProtocolInterfaces (
                    &HostBridge->HostBridgeHandle,
                    &gEfiPciHostBridgeResourceAllocationProtocolGuid,
                    &HostBridge->ResAlloc,
                    NULL
                    );
    if (EFI_ERROR (Status)) {
      FreePool (HostBridge);
      return EFI_DEVICE_ERROR;
    }

    //
    // Create Root Bridge Device Handle in this Host Bridge
    //

    for (Loop2 = 0; Loop2 < HostBridge->RootBridgeNumber; Loop2++) {
      PrivateData = AllocateZeroPool (sizeof(PCI_ROOT_BRIDGE_INSTANCE));
      if (PrivateData == NULL) {
        return EFI_OUT_OF_RESOURCES;
      }

      PrivateData->Signature = PCI_ROOT_BRIDGE_SIGNATURE;
      PrivateData->DevicePath =
        (EFI_DEVICE_PATH_PROTOCOL *)&mEfiPciRootBridgeDevicePath[Loop1][Loop2];

      RootBridgeConstructor (
        &PrivateData->Io,
        HostBridge->HostBridgeHandle,
        RootBridgeAttribute[Loop1][Loop2],
        &mResAperture[Loop1][Loop2]
        );

      Status = gBS->InstallMultipleProtocolInterfaces(
                      &PrivateData->Handle,
                      &gEfiDevicePathProtocolGuid,
                      PrivateData->DevicePath,
                      &gEfiPciRootBridgeIoProtocolGuid,
                      &PrivateData->Io,
                      NULL
                      );
      if (EFI_ERROR (Status)) {
        FreePool(PrivateData);
        return EFI_DEVICE_ERROR;
      }

      InsertTailList (&HostBridge->Head, &PrivateData->Link);
    }
  }

  return EFI_SUCCESS;
}


/**
  These are the notifications from the PCI bus driver that it is about to enter
  a certain phase of the PCI enumeration process.

  This member function can be used to notify the host bridge driver to perform
  specific actions, including any chipset-specific initialization, so that the
  chipset is ready to enter the next phase. Eight notification points are
  defined at this time. See belows:

  EfiPciHostBridgeBeginEnumeration       Resets the host bridge PCI apertures
                                         and internal data structures. The PCI
                                         enumerator should issue this
                                         notification before starting a fresh
                                         enumeration process. Enumeration
                                         cannot be restarted after sending any
                                         other notification such as
                                         EfiPciHostBridgeBeginBusAllocation.

  EfiPciHostBridgeBeginBusAllocation     The bus allocation phase is about to
                                         begin. No specific action is required
                                         here. This notification can be used to
                                         perform any chipset-specific
                                         programming.

  EfiPciHostBridgeEndBusAllocation       The bus allocation and bus programming
                                         phase is complete. No specific action
                                         is required here. This notification
                                         can be used to perform any
                                         chipset-specific programming.

  EfiPciHostBridgeBeginResourceAllocation
                                         The resource allocation phase is about
                                         to begin. No specific action is
                                         required here. This notification can
                                         be used to perform any
                                         chipset-specific programming.

  EfiPciHostBridgeAllocateResources      Allocates resources per previously
                                         submitted requests for all the PCI
                                         root bridges. These resource settings
                                         are returned on the next call to
                                         GetProposedResources(). Before calling
                                         NotifyPhase() with a Phase of
                                         EfiPciHostBridgeAllocateResource, the
                                         PCI bus enumerator is responsible for
                                         gathering I/O and memory requests for
                                         all the PCI root bridges and
                                         submitting these requests using
                                         SubmitResources(). This function pads
                                         the resource amount to suit the root
                                         bridge hardware, takes care of
                                         dependencies between the PCI root
                                         bridges, and calls the Global
                                         Coherency Domain (GCD) with the
                                         allocation request. In the case of
                                         padding, the allocated range could be
                                         bigger than what was requested.

  EfiPciHostBridgeSetResources           Programs the host bridge hardware to
                                         decode previously allocated resources
                                         (proposed resources) for all the PCI
                                         root bridges. After the hardware is
                                         programmed, reassigning resources will
                                         not be supported. The bus settings are
                                         not affected.

  EfiPciHostBridgeFreeResources          Deallocates resources that were
                                         previously allocated for all the PCI
                                         root bridges and resets the I/O and
                                         memory apertures to their initial
                                         state. The bus settings are not
                                         affected. If the request to allocate
                                         resources fails, the PCI enumerator
                                         can use this notification to
                                         deallocate previous resources, adjust
                                         the requests, and retry allocation.

  EfiPciHostBridgeEndResourceAllocation  The resource allocation phase is
                                         completed. No specific action is
                                         required here. This notification can
                                         be used to perform any chipsetspecific
                                         programming.

  @param[in] This                The instance pointer of
                               EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL

  @param[in] Phase               The phase during enumeration

  @retval EFI_NOT_READY          This phase cannot be entered at this time. For
                                 example, this error is valid for a Phase of
                                 EfiPciHostBridgeAllocateResources if
                                 SubmitResources() has not been called for one
                                 or more PCI root bridges before this call

  @retval EFI_DEVICE_ERROR       Programming failed due to a hardware error.
                                 This error is valid for a Phase of
                                 EfiPciHostBridgeSetResources.

  @retval EFI_INVALID_PARAMETER  Invalid phase parameter

  @retval EFI_OUT_OF_RESOURCES   The request could not be completed due to a
                                 lack of resources. This error is valid for a
                                 Phase of EfiPciHostBridgeAllocateResources if
                                 the previously submitted resource requests
                                 cannot be fulfilled or were only partially
                                 fulfilled.

  @retval EFI_SUCCESS            The notification was accepted without any
                                 errors.
**/
EFI_STATUS
EFIAPI
NotifyPhase(
  IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL *This,
  IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PHASE    Phase
  )
{
  PCI_HOST_BRIDGE_INSTANCE              *HostBridgeInstance;
  PCI_ROOT_BRIDGE_INSTANCE              *RootBridgeInstance;
  PCI_RESOURCE_TYPE                     Index;
  LIST_ENTRY                            *List;
  EFI_PHYSICAL_ADDRESS                  BaseAddress;
  UINT64                                AddrLen;
  UINTN                                 BitsOfAlignment;
  EFI_STATUS                            Status;
  EFI_STATUS                            ReturnStatus;

  HostBridgeInstance = INSTANCE_FROM_RESOURCE_ALLOCATION_THIS (This);

  switch (Phase) {

  case EfiPciHostBridgeBeginEnumeration:
    if (HostBridgeInstance->CanRestarted) {
      //
      // Reset the Each Root Bridge
      //
      List = HostBridgeInstance->Head.ForwardLink;

      while (List != &HostBridgeInstance->Head) {
        RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
        for (Index = TypeIo; Index < TypeMax; Index++) {
          RootBridgeInstance->ResAllocNode[Index].Type      = Index;
          RootBridgeInstance->ResAllocNode[Index].Base      = 0;
          RootBridgeInstance->ResAllocNode[Index].Length    = 0;
          RootBridgeInstance->ResAllocNode[Index].Status    = ResNone;
        }

        List = List->ForwardLink;
      }

      HostBridgeInstance->ResourceSubmited = FALSE;
      HostBridgeInstance->CanRestarted     = TRUE;
    } else {
      //
      // Can not restart
      //
      return EFI_NOT_READY;
    }
    break;

  case EfiPciHostBridgeEndEnumeration:
    break;

  case EfiPciHostBridgeBeginBusAllocation:
    //
    // No specific action is required here, can perform any chipset specific
    // programing
    //
    HostBridgeInstance->CanRestarted = FALSE;
    break;

  case EfiPciHostBridgeEndBusAllocation:
    //
    // No specific action is required here, can perform any chipset specific
    // programing
    //
    //HostBridgeInstance->CanRestarted = FALSE;
    break;

  case EfiPciHostBridgeBeginResourceAllocation:
    //
    // No specific action is required here, can perform any chipset specific
    // programing
    //
    //HostBridgeInstance->CanRestarted = FALSE;
    break;

  case EfiPciHostBridgeAllocateResources:
    ReturnStatus = EFI_SUCCESS;
    if (HostBridgeInstance->ResourceSubmited) {
      //
      // Take care of the resource dependencies between the root bridges
      //
      List = HostBridgeInstance->Head.ForwardLink;

      while (List != &HostBridgeInstance->Head) {
        RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
        for (Index = TypeIo; Index < TypeBus; Index++) {
          if (RootBridgeInstance->ResAllocNode[Index].Status != ResNone) {

            AddrLen = RootBridgeInstance->ResAllocNode[Index].Length;

            //
            // Get the number of '1' in Alignment.
            //
            BitsOfAlignment =
              (UINTN)(HighBitSet64 (
                        RootBridgeInstance->ResAllocNode[Index].Alignment
                        ) + 1);

            switch (Index) {

              case TypeIo:
                //
                // It is impossible for this chipset to align 0xFFFF for IO16
                // So clear it
                //
                if (BitsOfAlignment >= 16) {
                  BitsOfAlignment = 0;
                }

                Status = gDS->AllocateIoSpace (
                                EfiGcdAllocateAnySearchBottomUp,
                                EfiGcdIoTypeIo,
                                BitsOfAlignment,
                                AddrLen,
                                &BaseAddress,
                                mDriverImageHandle,
                                NULL
                                );

                if (!EFI_ERROR (Status)) {
                  RootBridgeInstance->ResAllocNode[Index].Base   =
                    (UINTN)BaseAddress;
                  RootBridgeInstance->ResAllocNode[Index].Status =
                    ResAllocated;
                } else {
                  ReturnStatus = Status;
                  if (Status != EFI_OUT_OF_RESOURCES) {
                    RootBridgeInstance->ResAllocNode[Index].Length = 0;
                  }
                }

                break;


              case TypeMem32:
                //
                // It is impossible for this chipset to align 0xFFFFFFFF for
                // Mem32
                // So clear it
                //

                if (BitsOfAlignment >= 32) {
                  BitsOfAlignment = 0;
                }

                Status = gDS->AllocateMemorySpace (
                                EfiGcdAllocateAnySearchBottomUp,
                                EfiGcdMemoryTypeMemoryMappedIo,
                                BitsOfAlignment,
                                AddrLen,
                                &BaseAddress,
                                mDriverImageHandle,
                                NULL
                                );

                if (!EFI_ERROR (Status)) {
                  // We were able to allocate the PCI memory
                  RootBridgeInstance->ResAllocNode[Index].Base   =
                    (UINTN)BaseAddress;
                  RootBridgeInstance->ResAllocNode[Index].Status =
                    ResAllocated;

                } else {
                  // Not able to allocate enough PCI memory
                  ReturnStatus = Status;

                  if (Status != EFI_OUT_OF_RESOURCES) {
                    RootBridgeInstance->ResAllocNode[Index].Length = 0;
                  }
                  ASSERT (FALSE);
                }
                break;

              case TypePMem32:
              case TypeMem64:
              case TypePMem64:
                  ReturnStatus = EFI_ABORTED;
                  break;
              default:
                ASSERT (FALSE);
                break;
              }; //end switch
          }
        }

        List = List->ForwardLink;
      }

      return ReturnStatus;

    } else {
      return EFI_NOT_READY;
    }
    break;

  case EfiPciHostBridgeSetResources:
    break;

  case EfiPciHostBridgeFreeResources:
    ReturnStatus = EFI_SUCCESS;
    List = HostBridgeInstance->Head.ForwardLink;
    while (List != &HostBridgeInstance->Head) {
      RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
      for (Index = TypeIo; Index < TypeBus; Index++) {
        if (RootBridgeInstance->ResAllocNode[Index].Status == ResAllocated) {
          AddrLen = RootBridgeInstance->ResAllocNode[Index].Length;
          BaseAddress = RootBridgeInstance->ResAllocNode[Index].Base;
          switch (Index) {

          case TypeIo:
            Status = gDS->FreeIoSpace (BaseAddress, AddrLen);
            if (EFI_ERROR (Status)) {
              ReturnStatus = Status;
            }
            break;

          case TypeMem32:
            Status = gDS->FreeMemorySpace (BaseAddress, AddrLen);
            if (EFI_ERROR (Status)) {
              ReturnStatus = Status;
            }
            break;

          case TypePMem32:
            break;

          case TypeMem64:
            break;

          case TypePMem64:
            break;

          default:
            ASSERT (FALSE);
            break;

          }; //end switch
          RootBridgeInstance->ResAllocNode[Index].Type      = Index;
          RootBridgeInstance->ResAllocNode[Index].Base      = 0;
          RootBridgeInstance->ResAllocNode[Index].Length    = 0;
          RootBridgeInstance->ResAllocNode[Index].Status    = ResNone;
        }
      }

      List = List->ForwardLink;
    }

    HostBridgeInstance->ResourceSubmited = FALSE;
    HostBridgeInstance->CanRestarted     = TRUE;
    return ReturnStatus;

  case EfiPciHostBridgeEndResourceAllocation:
    HostBridgeInstance->CanRestarted = FALSE;
    break;

  default:
    return EFI_INVALID_PARAMETER;
  }

  return EFI_SUCCESS;
}

/**
  Return the device handle of the next PCI root bridge that is associated with
  this Host Bridge.

  This function is called multiple times to retrieve the device handles of all
  the PCI root bridges that are associated with this PCI host bridge. Each PCI
  host bridge is associated with one or more PCI root bridges. On each call,
  the handle that was returned by the previous call is passed into the
  interface, and on output the interface returns the device handle of the next
  PCI root bridge. The caller can use the handle to obtain the instance of the
  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL for that root bridge. When there are no more
  PCI root bridges to report, the interface returns EFI_NOT_FOUND. A PCI
  enumerator must enumerate the PCI root bridges in the order that they are
  returned by this function.

  For D945 implementation, there is only one root bridge in PCI host bridge.

  @param[in]       This              The instance pointer of
                               EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL

  @param[in, out]  RootBridgeHandle  Returns the device handle of the next PCI
                                     root bridge.

  @retval EFI_SUCCESS            If parameter RootBridgeHandle = NULL, then
                                 return the first Rootbridge handle of the
                                 specific Host bridge and return EFI_SUCCESS.

  @retval EFI_NOT_FOUND          Can not find the any more root bridge in
                                 specific host bridge.

  @retval EFI_INVALID_PARAMETER  RootBridgeHandle is not an EFI_HANDLE that was
                                 returned on a previous call to
                                 GetNextRootBridge().
**/
EFI_STATUS
EFIAPI
GetNextRootBridge(
  IN       EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL *This,
  IN OUT   EFI_HANDLE                                       *RootBridgeHandle
  )
{
  BOOLEAN                               NoRootBridge;
  LIST_ENTRY                            *List;
  PCI_HOST_BRIDGE_INSTANCE              *HostBridgeInstance;
  PCI_ROOT_BRIDGE_INSTANCE              *RootBridgeInstance;

  NoRootBridge = TRUE;
  HostBridgeInstance = INSTANCE_FROM_RESOURCE_ALLOCATION_THIS (This);
  List = HostBridgeInstance->Head.ForwardLink;


  while (List != &HostBridgeInstance->Head) {
    NoRootBridge = FALSE;
    RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
    if (*RootBridgeHandle == NULL) {
      //
      // Return the first Root Bridge Handle of the Host Bridge
      //
      *RootBridgeHandle = RootBridgeInstance->Handle;
      return EFI_SUCCESS;
    } else {
      if (*RootBridgeHandle == RootBridgeInstance->Handle) {
        //
        // Get next if have
        //
        List = List->ForwardLink;
        if (List!=&HostBridgeInstance->Head) {
          RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
          *RootBridgeHandle = RootBridgeInstance->Handle;
          return EFI_SUCCESS;
        } else {
          return EFI_NOT_FOUND;
        }
      }
    }

    List = List->ForwardLink;
  } //end while

  if (NoRootBridge) {
    return EFI_NOT_FOUND;
  } else {
    return EFI_INVALID_PARAMETER;
  }
}

/**
  Returns the allocation attributes of a PCI root bridge.

  The function returns the allocation attributes of a specific PCI root bridge.
  The attributes can vary from one PCI root bridge to another. These attributes
  are different from the decode-related attributes that are returned by the
  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL.GetAttributes() member function. The
  RootBridgeHandle parameter is used to specify the instance of the PCI root
  bridge. The device handles of all the root bridges that are associated with
  this host bridge must be obtained by calling GetNextRootBridge(). The
  attributes are static in the sense that they do not change during or after
  the enumeration process. The hardware may provide mechanisms to change the
  attributes on the fly, but such changes must be completed before
  EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL is installed. The permitted
  values of EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_ATTRIBUTES are defined in
  "Related Definitions" below. The caller uses these attributes to combine
  multiple resource requests.

  For example, if the flag EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM is set, the PCI
  bus enumerator needs to include requests for the prefetchable memory in the
  nonprefetchable memory pool and not request any prefetchable memory.

  Attribute                             Description
  ------------------------------------  ---------------------------------------
  EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM  If this bit is set, then the PCI root
                                        bridge does not support separate
                                        windows for nonprefetchable and
                                        prefetchable memory. A PCI bus driver
                                        needs to include requests for
                                        prefetchable memory in the
                                        nonprefetchable memory pool.

  EFI_PCI_HOST_BRIDGE_MEM64_DECODE      If this bit is set, then the PCI root
                                        bridge supports 64-bit memory windows.
                                        If this bit is not set, the PCI bus
                                        driver needs to include requests for a
                                        64-bit memory address in the
                                        corresponding 32-bit memory pool.

  @param[in]   This               The instance pointer of
                               EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL

  @param[in]   RootBridgeHandle   The device handle of the PCI root bridge in
                                  which the caller is interested. Type
                                  EFI_HANDLE is defined in
                                  InstallProtocolInterface() in the UEFI 2.0
                                  Specification.

  @param[out]  Attributes         The pointer to attribte of root bridge, it is
                                  output parameter

  @retval EFI_INVALID_PARAMETER   Attribute pointer is NULL

  @retval EFI_INVALID_PARAMETER   RootBridgehandle is invalid.

  @retval EFI_SUCCESS             Success to get attribute of interested root
                                  bridge.
**/
EFI_STATUS
EFIAPI
GetAttributes(
  IN  EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL *This,
  IN  EFI_HANDLE                                       RootBridgeHandle,
  OUT UINT64                                           *Attributes
  )
{
  LIST_ENTRY                            *List;
  PCI_HOST_BRIDGE_INSTANCE              *HostBridgeInstance;
  PCI_ROOT_BRIDGE_INSTANCE              *RootBridgeInstance;

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

  HostBridgeInstance = INSTANCE_FROM_RESOURCE_ALLOCATION_THIS (This);
  List = HostBridgeInstance->Head.ForwardLink;

  while (List != &HostBridgeInstance->Head) {
    RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
    if (RootBridgeHandle == RootBridgeInstance->Handle) {
      *Attributes = RootBridgeInstance->RootBridgeAttrib;
      return EFI_SUCCESS;
    }
    List = List->ForwardLink;
  }

  //
  // RootBridgeHandle is not an EFI_HANDLE
  // that was returned on a previous call to GetNextRootBridge()
  //
  return EFI_INVALID_PARAMETER;
}

/**
  Sets up the specified PCI root bridge for the bus enumeration process.

  This member function sets up the root bridge for bus enumeration and returns
  the PCI bus range over which the search should be performed in ACPI 2.0
  resource descriptor format.

  @param[in]   This              The
                               EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
                                 instance.

  @param[in]   RootBridgeHandle  The PCI Root Bridge to be set up.

  @param[out]  Configuration     Pointer to the pointer to the PCI bus resource
                                 descriptor.

  @retval EFI_INVALID_PARAMETER Invalid Root bridge's handle

  @retval EFI_OUT_OF_RESOURCES  Fail to allocate ACPI resource descriptor tag.

  @retval EFI_SUCCESS           Sucess to allocate ACPI resource descriptor.
**/
EFI_STATUS
EFIAPI
StartBusEnumeration(
  IN  EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL *This,
  IN  EFI_HANDLE                                       RootBridgeHandle,
  OUT VOID                                             **Configuration
  )
{
  LIST_ENTRY                            *List;
  PCI_HOST_BRIDGE_INSTANCE              *HostBridgeInstance;
  PCI_ROOT_BRIDGE_INSTANCE              *RootBridgeInstance;
  VOID                                  *Buffer;
  UINT8                                 *Temp;
  UINT64                                BusStart;
  UINT64                                BusEnd;

  HostBridgeInstance = INSTANCE_FROM_RESOURCE_ALLOCATION_THIS (This);
  List = HostBridgeInstance->Head.ForwardLink;

  while (List != &HostBridgeInstance->Head) {
    RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
    if (RootBridgeHandle == RootBridgeInstance->Handle) {
      //
      // Set up the Root Bridge for Bus Enumeration
      //
      BusStart = RootBridgeInstance->BusBase;
      BusEnd   = RootBridgeInstance->BusLimit;
      //
      // Program the Hardware(if needed) if error return EFI_DEVICE_ERROR
      //

      Buffer = AllocatePool (
                 sizeof(EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) +
                 sizeof(EFI_ACPI_END_TAG_DESCRIPTOR)
                 );
      if (Buffer == NULL) {
        return EFI_OUT_OF_RESOURCES;
      }

      Temp = (UINT8 *)Buffer;

      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->Desc = 0x8A;
      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->Len  = 0x2B;
      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->ResType = 2;
      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->GenFlag = 0;
      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->SpecificFlag = 0;
      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->AddrSpaceGranularity = 0;
      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->AddrRangeMin = BusStart;
      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->AddrRangeMax = 0;
      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->AddrTranslationOffset = 0;
      ((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Temp)->AddrLen =
        BusEnd - BusStart + 1;

      Temp = Temp + sizeof(EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR);
      ((EFI_ACPI_END_TAG_DESCRIPTOR *)Temp)->Desc = 0x79;
      ((EFI_ACPI_END_TAG_DESCRIPTOR *)Temp)->Checksum = 0x0;

      *Configuration = Buffer;
      return EFI_SUCCESS;
    }
    List = List->ForwardLink;
  }

  return EFI_INVALID_PARAMETER;
}

/**
  Programs the PCI root bridge hardware so that it decodes the specified PCI
  bus range.

  This member function programs the specified PCI root bridge to decode the bus
  range that is specified by the input parameter Configuration.
  The bus range information is specified in terms of the ACPI 2.0 resource
  descriptor format.

  @param[in] This              The
                               EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
                               instance

  @param[in] RootBridgeHandle  The PCI Root Bridge whose bus range is to be
                               programmed

  @param[in] Configuration     The pointer to the PCI bus resource descriptor

  @retval EFI_INVALID_PARAMETER  RootBridgeHandle is not a valid root bridge
                                 handle.

  @retval EFI_INVALID_PARAMETER  Configuration is NULL.

  @retval EFI_INVALID_PARAMETER  Configuration does not point to a valid ACPI
                                 2.0 resource descriptor.

  @retval EFI_INVALID_PARAMETER  Configuration does not include a valid ACPI
                                 2.0 bus resource descriptor.

  @retval EFI_INVALID_PARAMETER  Configuration includes valid ACPI 2.0 resource
                                 descriptors other than bus descriptors.

  @retval EFI_INVALID_PARAMETER  Configuration contains one or more invalid
                                 ACPI resource descriptors.

  @retval EFI_INVALID_PARAMETER  "Address Range Minimum" is invalid for this
                                 root bridge.

  @retval EFI_INVALID_PARAMETER  "Address Range Length" is invalid for this
                                 root bridge.

  @retval EFI_DEVICE_ERROR       Programming failed due to a hardware error.

  @retval EFI_SUCCESS            The bus range for the PCI root bridge was
                                 programmed.
**/
EFI_STATUS
EFIAPI
SetBusNumbers(
  IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL *This,
  IN EFI_HANDLE                                       RootBridgeHandle,
  IN VOID                                             *Configuration
  )
{
  LIST_ENTRY                            *List;
  PCI_HOST_BRIDGE_INSTANCE              *HostBridgeInstance;
  PCI_ROOT_BRIDGE_INSTANCE              *RootBridgeInstance;
  UINT8                                 *Ptr;
  UINTN                                 BusStart;
  UINTN                                 BusEnd;
  UINTN                                 BusLen;

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

  Ptr = Configuration;

  //
  // Check the Configuration is valid
  //
  if(*Ptr != ACPI_ADDRESS_SPACE_DESCRIPTOR) {
    return EFI_INVALID_PARAMETER;
  }

  if (((EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Ptr)->ResType != 2) {
    return EFI_INVALID_PARAMETER;
  }

  Ptr += sizeof(EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR);
  if (*Ptr != ACPI_END_TAG_DESCRIPTOR) {
    return EFI_INVALID_PARAMETER;
  }

  HostBridgeInstance = INSTANCE_FROM_RESOURCE_ALLOCATION_THIS (This);
  List = HostBridgeInstance->Head.ForwardLink;

  Ptr = Configuration;

  while (List != &HostBridgeInstance->Head) {
    RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
    if (RootBridgeHandle == RootBridgeInstance->Handle) {
      EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *Desc;

      Desc = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *)Ptr;
      BusStart = (UINTN)Desc->AddrRangeMin;
      BusLen = (UINTN)Desc->AddrLen;
      BusEnd = BusStart + BusLen - 1;

      if (BusStart > BusEnd) {
        return EFI_INVALID_PARAMETER;
      }

      if ((BusStart < RootBridgeInstance->BusBase) ||
          (BusEnd > RootBridgeInstance->BusLimit)) {
        return EFI_INVALID_PARAMETER;
      }

      //
      // Update the Bus Range
      //
      RootBridgeInstance->ResAllocNode[TypeBus].Base   = BusStart;
      RootBridgeInstance->ResAllocNode[TypeBus].Length = BusLen;
      RootBridgeInstance->ResAllocNode[TypeBus].Status = ResAllocated;

      //
      // Program the Root Bridge Hardware
      //

      return EFI_SUCCESS;
    }

    List = List->ForwardLink;
  }

  return EFI_INVALID_PARAMETER;
}


/**
  Submits the I/O and memory resource requirements for the specified PCI root
  bridge.

  This function is used to submit all the I/O and memory resources that are
  required by the specified PCI root bridge. The input parameter Configuration
  is used to specify the following:
  - The various types of resources that are required
  - The associated lengths in terms of ACPI 2.0 resource descriptor format

  @param[in] This              Pointer to the
                               EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
                               instance.

  @param[in] RootBridgeHandle  The PCI root bridge whose I/O and memory
                               resource requirements are being submitted.

  @param[in] Configuration     The pointer to the PCI I/O and PCI memory
                               resource descriptor.

  @retval EFI_SUCCESS            The I/O and memory resource requests for a PCI
                                 root bridge were accepted.

  @retval EFI_INVALID_PARAMETER  RootBridgeHandle is not a valid root bridge
                                 handle.

  @retval EFI_INVALID_PARAMETER  Configuration is NULL.

  @retval EFI_INVALID_PARAMETER  Configuration does not point to a valid ACPI
                                 2.0 resource descriptor.

  @retval EFI_INVALID_PARAMETER  Configuration includes requests for one or
                                 more resource types that are not supported by
                                 this PCI root bridge. This error will happen
                                 if the caller did not combine resources
                                 according to Attributes that were returned by
                                 GetAllocAttributes().

  @retval EFI_INVALID_PARAMETER  Address Range Maximum" is invalid.

  @retval EFI_INVALID_PARAMETER  "Address Range Length" is invalid for this PCI
                                 root bridge.

  @retval EFI_INVALID_PARAMETER  "Address Space Granularity" is invalid for
                                 this PCI root bridge.
**/
EFI_STATUS
EFIAPI
SubmitResources(
  IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL *This,
  IN EFI_HANDLE                                       RootBridgeHandle,
  IN VOID                                             *Configuration
  )
{
  LIST_ENTRY                            *List;
  PCI_HOST_BRIDGE_INSTANCE              *HostBridgeInstance;
  PCI_ROOT_BRIDGE_INSTANCE              *RootBridgeInstance;
  UINT8                                 *Temp;
  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR     *Ptr;
  UINT64                                AddrLen;
  UINT64                                Alignment;

  //
  // Check the input parameter: Configuration
  //
  if (Configuration == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  HostBridgeInstance = INSTANCE_FROM_RESOURCE_ALLOCATION_THIS (This);
  List = HostBridgeInstance->Head.ForwardLink;

  Temp = (UINT8 *)Configuration;
  while ( *Temp == 0x8A) {
    Temp += sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) ;
  }
  if (*Temp != 0x79) {
    return EFI_INVALID_PARAMETER;
  }

  Temp = (UINT8 *)Configuration;
  while (List != &HostBridgeInstance->Head) {
    RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
    if (RootBridgeHandle == RootBridgeInstance->Handle) {
      while ( *Temp == 0x8A) {
        Ptr = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Temp ;

        //
        // Check Address Length
        //
        if (Ptr->AddrLen > 0xffffffff) {
          return EFI_INVALID_PARAMETER;
        }

        //
        // Check address range alignment
        //
        if (Ptr->AddrRangeMax >= 0xffffffff ||
            Ptr->AddrRangeMax != (GetPowerOfTwo64 (
                                    Ptr->AddrRangeMax + 1) - 1)) {
          return EFI_INVALID_PARAMETER;
        }

        switch (Ptr->ResType) {

        case 0:

          //
          // Check invalid Address Sapce Granularity
          //
          if (Ptr->AddrSpaceGranularity != 32) {
            return EFI_INVALID_PARAMETER;
          }

          //
          // check the memory resource request is supported by PCI root bridge
          //
          if (RootBridgeInstance->RootBridgeAttrib ==
                EFI_PCI_HOST_BRIDGE_COMBINE_MEM_PMEM &&
              Ptr->SpecificFlag == 0x06) {
            return EFI_INVALID_PARAMETER;
          }

          AddrLen = Ptr->AddrLen;
          Alignment = Ptr->AddrRangeMax;
          if (Ptr->AddrSpaceGranularity == 32) {
            if (Ptr->SpecificFlag == 0x06) {
              //
              // Apply from GCD
              //
              RootBridgeInstance->ResAllocNode[TypePMem32].Status =
                ResSubmitted;
            } else {
              RootBridgeInstance->ResAllocNode[TypeMem32].Length = AddrLen;
              RootBridgeInstance->ResAllocNode[TypeMem32].Alignment =
                Alignment;
              RootBridgeInstance->ResAllocNode[TypeMem32].Status =
                ResRequested;
              HostBridgeInstance->ResourceSubmited = TRUE;
            }
          }

          if (Ptr->AddrSpaceGranularity == 64) {
            if (Ptr->SpecificFlag == 0x06) {
              RootBridgeInstance->ResAllocNode[TypePMem64].Status =
                ResSubmitted;
            } else {
              RootBridgeInstance->ResAllocNode[TypeMem64].Status =
                ResSubmitted;
            }
          }
          break;

        case 1:
          AddrLen = (UINTN) Ptr->AddrLen;
          Alignment = (UINTN) Ptr->AddrRangeMax;
          RootBridgeInstance->ResAllocNode[TypeIo].Length  = AddrLen;
          RootBridgeInstance->ResAllocNode[TypeIo].Alignment = Alignment;
          RootBridgeInstance->ResAllocNode[TypeIo].Status  = ResRequested;
          HostBridgeInstance->ResourceSubmited = TRUE;
          break;

        default:
            break;
        };

        Temp += sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) ;
      }

      return EFI_SUCCESS;
    }

    List = List->ForwardLink;
  }

  return EFI_INVALID_PARAMETER;
}

/**
   Returns the proposed resource settings for the specified PCI root bridge.

   This member function returns the proposed resource settings for the
   specified PCI root bridge. The proposed resource settings are prepared when
   NotifyPhase() is called with a Phase of EfiPciHostBridgeAllocateResources.
   The output parameter Configuration specifies the following:
   - The various types of resources, excluding bus resources, that are
     allocated
   - The associated lengths in terms of ACPI 2.0 resource descriptor format

   @param[in]  This              Pointer to the
                               EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
                                 instance.

   @param[in]  RootBridgeHandle  The PCI root bridge handle. Type EFI_HANDLE is
                                 defined in InstallProtocolInterface() in the
                                 UEFI 2.0 Specification.

   @param[out] Configuration     The pointer to the pointer to the PCI I/O and
                                 memory resource descriptor.

   @retval EFI_SUCCESS            The requested parameters were returned.

   @retval EFI_INVALID_PARAMETER  RootBridgeHandle is not a valid root bridge
                                  handle.

   @retval EFI_DEVICE_ERROR       Programming failed due to a hardware error.

   @retval EFI_OUT_OF_RESOURCES   The request could not be completed due to a
                                  lack of resources.
**/
EFI_STATUS
EFIAPI
GetProposedResources(
  IN  EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL *This,
  IN  EFI_HANDLE                                       RootBridgeHandle,
  OUT VOID                                             **Configuration
  )
{
  LIST_ENTRY                            *List;
  PCI_HOST_BRIDGE_INSTANCE              *HostBridgeInstance;
  PCI_ROOT_BRIDGE_INSTANCE              *RootBridgeInstance;
  UINTN                                 Index;
  UINTN                                 Number;
  VOID                                  *Buffer;
  UINT8                                 *Temp;
  EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR     *Ptr;
  UINT64                                ResStatus;

  Buffer = NULL;
  Number = 0;
  //
  // Get the Host Bridge Instance from the resource allocation protocol
  //
  HostBridgeInstance = INSTANCE_FROM_RESOURCE_ALLOCATION_THIS (This);
  List = HostBridgeInstance->Head.ForwardLink;

  //
  // Enumerate the root bridges in this host bridge
  //
  while (List != &HostBridgeInstance->Head) {
    RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
    if (RootBridgeHandle == RootBridgeInstance->Handle) {
      for (Index = 0; Index < TypeBus; Index ++) {
        if (RootBridgeInstance->ResAllocNode[Index].Status != ResNone) {
          Number ++;
        }
      }

      if (Number ==  0) {
        return EFI_INVALID_PARAMETER;
      }

      Buffer = AllocateZeroPool (
                 Number * sizeof(EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR) +
                 sizeof(EFI_ACPI_END_TAG_DESCRIPTOR)
                 );
      if (Buffer == NULL) {
        return EFI_OUT_OF_RESOURCES;
      }

      Temp = Buffer;
      for (Index = 0; Index < TypeBus; Index ++) {
        if (RootBridgeInstance->ResAllocNode[Index].Status != ResNone) {
          Ptr = (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *) Temp ;
          ResStatus = RootBridgeInstance->ResAllocNode[Index].Status;

          switch (Index) {

          case TypeIo:
            //
            // Io
            //
            Ptr->Desc = 0x8A;
            Ptr->Len  = 0x2B;
            Ptr->ResType = 1;
            Ptr->GenFlag = 0;
            Ptr->SpecificFlag = 0;
            Ptr->AddrRangeMin = RootBridgeInstance->ResAllocNode[Index].Base;
            Ptr->AddrRangeMax = 0;
            Ptr->AddrTranslationOffset = (ResStatus == ResAllocated) ?
                                           EFI_RESOURCE_SATISFIED :
                                           EFI_RESOURCE_LESS;
            Ptr->AddrLen = RootBridgeInstance->ResAllocNode[Index].Length;
            break;

          case TypeMem32:
            //
            // Memory 32
            //
            Ptr->Desc = 0x8A;
            Ptr->Len  = 0x2B;
            Ptr->ResType = 0;
            Ptr->GenFlag = 0;
            Ptr->SpecificFlag = 0;
            Ptr->AddrSpaceGranularity = 32;
            Ptr->AddrRangeMin = RootBridgeInstance->ResAllocNode[Index].Base;
            Ptr->AddrRangeMax = 0;
            Ptr->AddrTranslationOffset = (ResStatus == ResAllocated) ?
                                           EFI_RESOURCE_SATISFIED :
                                           EFI_RESOURCE_LESS;
            Ptr->AddrLen = RootBridgeInstance->ResAllocNode[Index].Length;
            break;

          case TypePMem32:
            //
            // Prefetch memory 32
            //
            Ptr->Desc = 0x8A;
            Ptr->Len  = 0x2B;
            Ptr->ResType = 0;
            Ptr->GenFlag = 0;
            Ptr->SpecificFlag = 6;
            Ptr->AddrSpaceGranularity = 32;
            Ptr->AddrRangeMin = 0;
            Ptr->AddrRangeMax = 0;
            Ptr->AddrTranslationOffset = EFI_RESOURCE_NONEXISTENT;
            Ptr->AddrLen = 0;
            break;

          case TypeMem64:
            //
            // Memory 64
            //
            Ptr->Desc = 0x8A;
            Ptr->Len  = 0x2B;
            Ptr->ResType = 0;
            Ptr->GenFlag = 0;
            Ptr->SpecificFlag = 0;
            Ptr->AddrSpaceGranularity = 64;
            Ptr->AddrRangeMin = 0;
            Ptr->AddrRangeMax = 0;
            Ptr->AddrTranslationOffset = EFI_RESOURCE_NONEXISTENT;
            Ptr->AddrLen = 0;
            break;

          case TypePMem64:
            //
            // Prefetch memory 64
            //
            Ptr->Desc = 0x8A;
            Ptr->Len  = 0x2B;
            Ptr->ResType = 0;
            Ptr->GenFlag = 0;
            Ptr->SpecificFlag = 6;
            Ptr->AddrSpaceGranularity = 64;
            Ptr->AddrRangeMin = 0;
            Ptr->AddrRangeMax = 0;
            Ptr->AddrTranslationOffset = EFI_RESOURCE_NONEXISTENT;
            Ptr->AddrLen = 0;
            break;
          };

          Temp += sizeof (EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR);
        }
      }

      ((EFI_ACPI_END_TAG_DESCRIPTOR *)Temp)->Desc = 0x79;
      ((EFI_ACPI_END_TAG_DESCRIPTOR *)Temp)->Checksum = 0x0;

      *Configuration = Buffer;

      return EFI_SUCCESS;
    }

    List = List->ForwardLink;
  }

  return EFI_INVALID_PARAMETER;
}

/**
  Provides the hooks from the PCI bus driver to every PCI controller
  (device/function) at various stages of the PCI enumeration process that allow
  the host bridge driver to preinitialize individual PCI controllers before
  enumeration.

  This function is called during the PCI enumeration process. No specific
  action is expected from this member function. It allows the host bridge
  driver to preinitialize individual PCI controllers before enumeration.

  @param This              Pointer to the
                           EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL
                           instance.

  @param RootBridgeHandle  The associated PCI root bridge handle. Type
                           EFI_HANDLE is defined in InstallProtocolInterface()
                           in the UEFI 2.0 Specification.

  @param PciAddress        The address of the PCI device on the PCI bus. This
                           address can be passed to the
                           EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL member functions to
                           access the PCI configuration space of the device.
                           See Table 12-1 in the UEFI 2.0 Specification for the
                           definition of
                           EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS.

  @param Phase             The phase of the PCI device enumeration.

  @retval EFI_SUCCESS              The requested parameters were returned.

  @retval EFI_INVALID_PARAMETER    RootBridgeHandle is not a valid root bridge
                                   handle.

  @retval EFI_INVALID_PARAMETER    Phase is not a valid phase that is defined
                                   in
                                  EFI_PCI_CONTROLLER_RESOURCE_ALLOCATION_PHASE.

  @retval EFI_DEVICE_ERROR         Programming failed due to a hardware error.
                                   The PCI enumerator should not enumerate this
                                   device, including its child devices if it is
                                   a PCI-to-PCI bridge.
**/
EFI_STATUS
EFIAPI
PreprocessController (
  IN  EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL        *This,
  IN  EFI_HANDLE                                              RootBridgeHandle,
  IN  EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_PCI_ADDRESS             PciAddress,
  IN  EFI_PCI_CONTROLLER_RESOURCE_ALLOCATION_PHASE            Phase
  )
{
  PCI_HOST_BRIDGE_INSTANCE              *HostBridgeInstance;
  PCI_ROOT_BRIDGE_INSTANCE              *RootBridgeInstance;
  LIST_ENTRY                            *List;

  HostBridgeInstance = INSTANCE_FROM_RESOURCE_ALLOCATION_THIS (This);
  List = HostBridgeInstance->Head.ForwardLink;

  //
  // Enumerate the root bridges in this host bridge
  //
  while (List != &HostBridgeInstance->Head) {
    RootBridgeInstance = DRIVER_INSTANCE_FROM_LIST_ENTRY (List);
    if (RootBridgeHandle == RootBridgeInstance->Handle) {
      break;
    }
    List = List->ForwardLink;
  }
  if (List == &HostBridgeInstance->Head) {
    return EFI_INVALID_PARAMETER;
  }

  if ((UINT32)Phase > EfiPciBeforeResourceCollection) {
    return EFI_INVALID_PARAMETER;
  }

  return EFI_SUCCESS;
}