forked from reactos/reactos
/
ex.h
1472 lines (1270 loc) · 34.5 KB
/
ex.h
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
#pragma once
/* GLOBAL VARIABLES *********************************************************/
extern TIME_ZONE_INFORMATION ExpTimeZoneInfo;
extern LARGE_INTEGER ExpTimeZoneBias;
extern ULONG ExpTimeZoneId;
extern ULONG ExpTickCountMultiplier;
extern ULONG ExpLastTimeZoneBias;
extern POBJECT_TYPE ExEventPairObjectType;
extern POBJECT_TYPE _ExEventObjectType, _ExSemaphoreObjectType;
extern FAST_MUTEX ExpEnvironmentLock;
extern ERESOURCE ExpFirmwareTableResource;
extern LIST_ENTRY ExpFirmwareTableProviderListHead;
extern BOOLEAN ExpIsWinPEMode;
extern LIST_ENTRY ExpSystemResourcesList;
extern ULONG ExpAnsiCodePageDataOffset, ExpOemCodePageDataOffset;
extern ULONG ExpUnicodeCaseTableDataOffset;
extern PVOID ExpNlsSectionPointer;
extern ULONG NtGlobalFlag;
extern UNICODE_STRING NtSystemRoot;
extern ULONG ExpInitializationPhase;
extern ULONG ExpAltTimeZoneBias;
extern LIST_ENTRY ExSystemLookasideListHead;
extern PCALLBACK_OBJECT PowerStateCallback;
extern LIST_ENTRY ExPoolLookasideListHead;
extern LIST_ENTRY ExpNonPagedLookasideListHead;
extern LIST_ENTRY ExpPagedLookasideListHead;
extern KSPIN_LOCK ExpNonPagedLookasideListLock;
extern KSPIN_LOCK ExpPagedLookasideListLock;
/*
* NT/Cm Version Info variables
*/
extern ULONG NtMajorVersion;
extern ULONG NtMinorVersion;
extern ULONG NtBuildNumber;
extern ULONG CmNtSpBuildNumber;
extern ULONG CmNtCSDVersion;
extern ULONG CmNtCSDReleaseType;
extern UNICODE_STRING CmVersionString;
extern UNICODE_STRING CmCSDVersionString;
extern CHAR NtBuildLab[];
// #ifdef _WINKD_
/*
* WinDBG Debugger Worker State Machine data (see dbgctrl.c)
*/
typedef enum _WINKD_WORKER_STATE
{
WinKdWorkerReady = 0,
WinKdWorkerStart,
WinKdWorkerInitialized
} WINKD_WORKER_STATE;
extern WORK_QUEUE_ITEM ExpDebuggerWorkItem;
extern WINKD_WORKER_STATE ExpDebuggerWork;
extern PEPROCESS ExpDebuggerProcessAttach;
extern PEPROCESS ExpDebuggerProcessKill;
extern ULONG_PTR ExpDebuggerPageIn;
VOID NTAPI ExpDebuggerWorker(IN PVOID Context);
// #endif /* _WINKD_ */
#ifdef _WIN64
#define HANDLE_LOW_BITS (PAGE_SHIFT - 4)
#define HANDLE_HIGH_BITS (PAGE_SHIFT - 3)
#else
#define HANDLE_LOW_BITS (PAGE_SHIFT - 3)
#define HANDLE_HIGH_BITS (PAGE_SHIFT - 2)
#endif
#define HANDLE_TAG_BITS (2)
#define HANDLE_INDEX_BITS (HANDLE_LOW_BITS + 2*HANDLE_HIGH_BITS)
#define KERNEL_FLAG_BITS (sizeof(PVOID)*8 - HANDLE_INDEX_BITS - HANDLE_TAG_BITS)
typedef union _EXHANDLE
{
struct
{
ULONG_PTR TagBits: HANDLE_TAG_BITS;
ULONG_PTR Index: HANDLE_INDEX_BITS;
ULONG_PTR KernelFlag : KERNEL_FLAG_BITS;
};
struct
{
ULONG_PTR TagBits2: HANDLE_TAG_BITS;
ULONG_PTR LowIndex: HANDLE_LOW_BITS;
ULONG_PTR MidIndex: HANDLE_HIGH_BITS;
ULONG_PTR HighIndex: HANDLE_HIGH_BITS;
ULONG_PTR KernelFlag2: KERNEL_FLAG_BITS;
};
HANDLE GenericHandleOverlay;
ULONG_PTR Value;
ULONG AsULONG;
} EXHANDLE, *PEXHANDLE;
typedef struct _ETIMER
{
KTIMER KeTimer;
KAPC TimerApc;
KDPC TimerDpc;
LIST_ENTRY ActiveTimerListEntry;
KSPIN_LOCK Lock;
LONG Period;
BOOLEAN ApcAssociated;
BOOLEAN WakeTimer;
LIST_ENTRY WakeTimerListEntry;
} ETIMER, *PETIMER;
typedef struct
{
PCALLBACK_OBJECT *CallbackObject;
PWSTR Name;
} SYSTEM_CALLBACKS;
typedef struct _HARDERROR_USER_PARAMETERS
{
ULONG_PTR Parameters[MAXIMUM_HARDERROR_PARAMETERS];
UNICODE_STRING Strings[MAXIMUM_HARDERROR_PARAMETERS];
WCHAR Buffer[ANYSIZE_ARRAY];
} HARDERROR_USER_PARAMETERS, *PHARDERROR_USER_PARAMETERS;
#define MAX_FAST_REFS 7
#define ExAcquireRundownProtection _ExAcquireRundownProtection
#define ExReleaseRundownProtection _ExReleaseRundownProtection
#define ExInitializeRundownProtection _ExInitializeRundownProtection
#define ExWaitForRundownProtectionRelease _ExWaitForRundownProtectionRelease
#define ExRundownCompleted _ExRundownCompleted
#define ExGetPreviousMode KeGetPreviousMode
//
// Various bits tagged on the handle or handle table
//
#define EXHANDLE_TABLE_ENTRY_LOCK_BIT 1
#define FREE_HANDLE_MASK -1
//
// Number of entries in each table level
//
#define LOW_LEVEL_ENTRIES (PAGE_SIZE / sizeof(HANDLE_TABLE_ENTRY))
#define MID_LEVEL_ENTRIES (PAGE_SIZE / sizeof(PHANDLE_TABLE_ENTRY))
#define HIGH_LEVEL_ENTRIES (16777216 / (LOW_LEVEL_ENTRIES * MID_LEVEL_ENTRIES))
//
// Maximum index in each table level before we need another table
//
#define MAX_LOW_INDEX LOW_LEVEL_ENTRIES
#define MAX_MID_INDEX (MID_LEVEL_ENTRIES * LOW_LEVEL_ENTRIES)
#define MAX_HIGH_INDEX (MID_LEVEL_ENTRIES * MID_LEVEL_ENTRIES * LOW_LEVEL_ENTRIES)
#define ExpChangeRundown(x, y, z) (ULONG_PTR)InterlockedCompareExchangePointer(&x->Ptr, (PVOID)y, (PVOID)z)
#define ExpChangePushlock(x, y, z) InterlockedCompareExchangePointer((PVOID*)x, (PVOID)y, (PVOID)z)
#define ExpSetRundown(x, y) InterlockedExchangePointer(&x->Ptr, (PVOID)y)
NTSTATUS
NTAPI
ExGetPoolTagInfo(
IN PSYSTEM_POOLTAG_INFORMATION SystemInformation,
IN ULONG SystemInformationLength,
IN OUT PULONG ReturnLength OPTIONAL
);
/* INITIALIZATION FUNCTIONS *************************************************/
BOOLEAN
NTAPI
ExpWin32kInit(VOID);
VOID
NTAPI
ExInit2(VOID);
VOID
NTAPI
Phase1Initialization(
IN PVOID Context
);
VOID
NTAPI
ExpInitializePushLocks(VOID);
BOOLEAN
NTAPI
ExRefreshTimeZoneInformation(
IN PLARGE_INTEGER SystemBootTime
);
VOID
NTAPI
ExpInitializeWorkerThreads(VOID);
VOID
NTAPI
ExSwapinWorkerThreads(IN BOOLEAN AllowSwap);
VOID
NTAPI
ExpInitLookasideLists(VOID);
VOID
NTAPI
ExInitializeSystemLookasideList(
IN PGENERAL_LOOKASIDE List,
IN POOL_TYPE Type,
IN ULONG Size,
IN ULONG Tag,
IN USHORT MaximumDepth,
IN PLIST_ENTRY ListHead
);
BOOLEAN
NTAPI
ExpInitializeCallbacks(VOID);
VOID
NTAPI
ExpInitUuids(VOID);
VOID
NTAPI
ExpInitializeExecutive(
IN ULONG Cpu,
IN PLOADER_PARAMETER_BLOCK LoaderBlock
);
BOOLEAN
NTAPI
ExpInitializeEventImplementation(VOID);
BOOLEAN
NTAPI
ExpInitializeKeyedEventImplementation(VOID);
BOOLEAN
NTAPI
ExpInitializeEventPairImplementation(VOID);
BOOLEAN
NTAPI
ExpInitializeSemaphoreImplementation(VOID);
BOOLEAN
NTAPI
ExpInitializeMutantImplementation(VOID);
BOOLEAN
NTAPI
ExpInitializeTimerImplementation(VOID);
BOOLEAN
NTAPI
ExpInitializeProfileImplementation(VOID);
VOID
NTAPI
ExpResourceInitialization(VOID);
VOID
NTAPI
ExInitPoolLookasidePointers(VOID);
/* Callback Functions ********************************************************/
VOID
NTAPI
ExInitializeCallBack(
IN OUT PEX_CALLBACK Callback
);
PEX_CALLBACK_ROUTINE_BLOCK
NTAPI
ExAllocateCallBack(
IN PEX_CALLBACK_FUNCTION Function,
IN PVOID Context
);
VOID
NTAPI
ExFreeCallBack(
IN PEX_CALLBACK_ROUTINE_BLOCK CallbackRoutineBlock
);
BOOLEAN
NTAPI
ExCompareExchangeCallBack (
IN OUT PEX_CALLBACK CallBack,
IN PEX_CALLBACK_ROUTINE_BLOCK NewBlock,
IN PEX_CALLBACK_ROUTINE_BLOCK OldBlock
);
PEX_CALLBACK_ROUTINE_BLOCK
NTAPI
ExReferenceCallBackBlock(
IN OUT PEX_CALLBACK CallBack
);
VOID
NTAPI
ExDereferenceCallBackBlock(
IN OUT PEX_CALLBACK CallBack,
IN PEX_CALLBACK_ROUTINE_BLOCK CallbackRoutineBlock
);
PEX_CALLBACK_FUNCTION
NTAPI
ExGetCallBackBlockRoutine(
IN PEX_CALLBACK_ROUTINE_BLOCK CallbackRoutineBlock
);
PVOID
NTAPI
ExGetCallBackBlockContext(
IN PEX_CALLBACK_ROUTINE_BLOCK CallbackRoutineBlock
);
VOID
NTAPI
ExWaitForCallBacks(
IN PEX_CALLBACK_ROUTINE_BLOCK CallbackRoutineBlock
);
/* Rundown Functions ********************************************************/
VOID
FASTCALL
ExfInitializeRundownProtection(
OUT PEX_RUNDOWN_REF RunRef
);
VOID
FASTCALL
ExfReInitializeRundownProtection(
OUT PEX_RUNDOWN_REF RunRef
);
BOOLEAN
FASTCALL
ExfAcquireRundownProtection(
IN OUT PEX_RUNDOWN_REF RunRef
);
BOOLEAN
FASTCALL
ExfAcquireRundownProtectionEx(
IN OUT PEX_RUNDOWN_REF RunRef,
IN ULONG Count
);
VOID
FASTCALL
ExfReleaseRundownProtection(
IN OUT PEX_RUNDOWN_REF RunRef
);
VOID
FASTCALL
ExfReleaseRundownProtectionEx(
IN OUT PEX_RUNDOWN_REF RunRef,
IN ULONG Count
);
VOID
FASTCALL
ExfRundownCompleted(
OUT PEX_RUNDOWN_REF RunRef
);
VOID
FASTCALL
ExfWaitForRundownProtectionRelease(
IN OUT PEX_RUNDOWN_REF RunRef
);
/* HANDLE TABLE FUNCTIONS ***************************************************/
typedef BOOLEAN
(NTAPI *PEX_SWEEP_HANDLE_CALLBACK)(
PHANDLE_TABLE_ENTRY HandleTableEntry,
HANDLE Handle,
PVOID Context
);
typedef BOOLEAN
(NTAPI *PEX_DUPLICATE_HANDLE_CALLBACK)(
IN PEPROCESS Process,
IN PHANDLE_TABLE HandleTable,
IN PHANDLE_TABLE_ENTRY HandleTableEntry,
IN PHANDLE_TABLE_ENTRY NewEntry
);
typedef BOOLEAN
(NTAPI *PEX_CHANGE_HANDLE_CALLBACK)(
PHANDLE_TABLE_ENTRY HandleTableEntry,
ULONG_PTR Context
);
VOID
NTAPI
ExpInitializeHandleTables(
VOID
);
PHANDLE_TABLE
NTAPI
ExCreateHandleTable(
IN PEPROCESS Process OPTIONAL
);
VOID
NTAPI
ExUnlockHandleTableEntry(
IN PHANDLE_TABLE HandleTable,
IN PHANDLE_TABLE_ENTRY HandleTableEntry
);
HANDLE
NTAPI
ExCreateHandle(
IN PHANDLE_TABLE HandleTable,
IN PHANDLE_TABLE_ENTRY HandleTableEntry
);
VOID
NTAPI
ExDestroyHandleTable(
IN PHANDLE_TABLE HandleTable,
IN PVOID DestroyHandleProcedure OPTIONAL
);
BOOLEAN
NTAPI
ExDestroyHandle(
IN PHANDLE_TABLE HandleTable,
IN HANDLE Handle,
IN PHANDLE_TABLE_ENTRY HandleTableEntry OPTIONAL
);
PHANDLE_TABLE_ENTRY
NTAPI
ExMapHandleToPointer(
IN PHANDLE_TABLE HandleTable,
IN HANDLE Handle
);
PHANDLE_TABLE
NTAPI
ExDupHandleTable(
IN PEPROCESS Process,
IN PHANDLE_TABLE HandleTable,
IN PEX_DUPLICATE_HANDLE_CALLBACK DupHandleProcedure,
IN ULONG_PTR Mask
);
BOOLEAN
NTAPI
ExChangeHandle(
IN PHANDLE_TABLE HandleTable,
IN HANDLE Handle,
IN PEX_CHANGE_HANDLE_CALLBACK ChangeRoutine,
IN ULONG_PTR Context
);
VOID
NTAPI
ExSweepHandleTable(
IN PHANDLE_TABLE HandleTable,
IN PEX_SWEEP_HANDLE_CALLBACK EnumHandleProcedure,
IN PVOID Context
);
PHANDLE_TABLE_ENTRY
NTAPI
ExpLookupHandleTableEntry(
IN PHANDLE_TABLE HandleTable,
IN EXHANDLE Handle
);
BOOLEAN
NTAPI
ExpLockHandleTableEntry(
IN PHANDLE_TABLE HandleTable,
IN PHANDLE_TABLE_ENTRY HandleTableEntry
);
/* PSEH EXCEPTION HANDLING **************************************************/
LONG
NTAPI
ExSystemExceptionFilter(VOID);
/* CALLBACKS *****************************************************************/
FORCEINLINE
VOID
ExDoCallBack(IN OUT PEX_CALLBACK Callback,
IN PVOID Context,
IN PVOID Argument1,
IN PVOID Argument2)
{
PEX_CALLBACK_ROUTINE_BLOCK CallbackBlock;
PEX_CALLBACK_FUNCTION Function;
/* Reference the block */
CallbackBlock = ExReferenceCallBackBlock(Callback);
if (CallbackBlock)
{
/* Get the function */
Function = ExGetCallBackBlockRoutine(CallbackBlock);
/* Do the callback */
Function(Context, Argument1, Argument2);
/* Now dereference it */
ExDereferenceCallBackBlock(Callback, CallbackBlock);
}
}
/* FAST REFS ******************************************************************/
FORCEINLINE
PVOID
ExGetObjectFastReference(IN EX_FAST_REF FastRef)
{
/* Return the unbiased pointer */
return (PVOID)(FastRef.Value & ~MAX_FAST_REFS);
}
FORCEINLINE
ULONG
ExGetCountFastReference(IN EX_FAST_REF FastRef)
{
/* Return the reference count */
return (ULONG)FastRef.RefCnt;
}
FORCEINLINE
VOID
ExInitializeFastReference(OUT PEX_FAST_REF FastRef,
IN OPTIONAL PVOID Object)
{
/* Sanity check */
ASSERT((((ULONG_PTR)Object) & MAX_FAST_REFS) == 0);
/* Check if an object is being set */
if (!Object)
{
/* Clear the field */
FastRef->Object = NULL;
}
else
{
/* Otherwise, we assume the object was referenced and is ready */
FastRef->Value = (ULONG_PTR)Object | MAX_FAST_REFS;
}
}
FORCEINLINE
EX_FAST_REF
ExAcquireFastReference(IN OUT PEX_FAST_REF FastRef)
{
EX_FAST_REF OldValue, NewValue;
/* Start reference loop */
for (;;)
{
/* Get the current reference count */
OldValue = *FastRef;
if (OldValue.RefCnt)
{
/* Increase the reference count */
NewValue.Value = OldValue.Value - 1;
NewValue.Object = ExpChangePushlock(&FastRef->Object,
NewValue.Object,
OldValue.Object);
if (NewValue.Object != OldValue.Object) continue;
}
/* We are done */
break;
}
/* Return the old value */
return OldValue;
}
FORCEINLINE
BOOLEAN
ExInsertFastReference(IN OUT PEX_FAST_REF FastRef,
IN PVOID Object)
{
EX_FAST_REF OldValue, NewValue;
/* Sanity checks */
ASSERT(!(((ULONG_PTR)Object) & MAX_FAST_REFS));
/* Start update loop */
for (;;)
{
/* Get the current reference count */
OldValue = *FastRef;
/* Check if the current count is too high or if the pointer changed */
if (((OldValue.RefCnt + MAX_FAST_REFS) > MAX_FAST_REFS) ||
((OldValue.Value &~ MAX_FAST_REFS) != (ULONG_PTR)Object))
{
/* Fail */
return FALSE;
}
/* Update the reference count */
NewValue.Value = OldValue.Value + MAX_FAST_REFS;
NewValue.Object = ExpChangePushlock(&FastRef->Object,
NewValue.Object,
OldValue.Object);
if (NewValue.Object != OldValue.Object) continue;
/* We are done */
break;
}
/* Return success */
return TRUE;
}
FORCEINLINE
BOOLEAN
ExReleaseFastReference(IN PEX_FAST_REF FastRef,
IN PVOID Object)
{
EX_FAST_REF OldValue, NewValue;
/* Sanity checks */
ASSERT(Object != NULL);
ASSERT(!(((ULONG_PTR)Object) & MAX_FAST_REFS));
/* Start reference loop */
for (;;)
{
/* Get the current reference count */
OldValue = *FastRef;
/* Check if we're full if if the pointer changed */
if ((OldValue.Value ^ (ULONG_PTR)Object) >= MAX_FAST_REFS) return FALSE;
/* Decrease the reference count */
NewValue.Value = OldValue.Value + 1;
NewValue.Object = ExpChangePushlock(&FastRef->Object,
NewValue.Object,
OldValue.Object);
if (NewValue.Object != OldValue.Object) continue;
/* We are done */
break;
}
/* Return success */
return TRUE;
}
FORCEINLINE
EX_FAST_REF
ExSwapFastReference(IN PEX_FAST_REF FastRef,
IN PVOID Object)
{
EX_FAST_REF NewValue, OldValue;
/* Sanity check */
ASSERT((((ULONG_PTR)Object) & MAX_FAST_REFS) == 0);
/* Check if an object is being set */
if (!Object)
{
/* Clear the field */
NewValue.Object = NULL;
}
else
{
/* Otherwise, we assume the object was referenced and is ready */
NewValue.Value = (ULONG_PTR)Object | MAX_FAST_REFS;
}
/* Update the object */
OldValue.Object = InterlockedExchangePointer(&FastRef->Object, NewValue.Object);
return OldValue;
}
FORCEINLINE
EX_FAST_REF
ExCompareSwapFastReference(IN PEX_FAST_REF FastRef,
IN PVOID Object,
IN PVOID OldObject)
{
EX_FAST_REF OldValue, NewValue;
/* Sanity check and start swap loop */
ASSERT(!(((ULONG_PTR)Object) & MAX_FAST_REFS));
for (;;)
{
/* Get the current value */
OldValue = *FastRef;
/* Make sure there's enough references to swap */
if (!((OldValue.Value ^ (ULONG_PTR)OldObject) <= MAX_FAST_REFS)) break;
/* Check if we have an object to swap */
if (Object)
{
/* Set up the value with maximum fast references */
NewValue.Value = (ULONG_PTR)Object | MAX_FAST_REFS;
}
else
{
/* Write the object address itself (which is empty) */
NewValue.Value = (ULONG_PTR)Object;
}
/* Do the actual compare exchange */
NewValue.Object = ExpChangePushlock(&FastRef->Object,
NewValue.Object,
OldValue.Object);
if (NewValue.Object != OldValue.Object) continue;
/* All done */
break;
}
/* Return the old value */
return OldValue;
}
/* RUNDOWN *******************************************************************/
/*++
* @name ExfAcquireRundownProtection
* INTERNAL MACRO
*
* The ExfAcquireRundownProtection routine acquires rundown protection for
* the specified descriptor.
*
* @param RunRef
* Pointer to a rundown reference descriptor.
*
* @return TRUE if access to the protected structure was granted, FALSE otherwise.
*
* @remarks This is the internal macro for system use only.In case the rundown
* was active, then the slow-path will be called through the exported
* function.
*
*--*/
FORCEINLINE
BOOLEAN
_ExAcquireRundownProtection(IN PEX_RUNDOWN_REF RunRef)
{
ULONG_PTR Value, NewValue;
/* Get the current value and mask the active bit */
Value = RunRef->Count &~ EX_RUNDOWN_ACTIVE;
/* Add a reference */
NewValue = Value + EX_RUNDOWN_COUNT_INC;
/* Change the value */
NewValue = ExpChangeRundown(RunRef, NewValue, Value);
if (NewValue != Value)
{
/* Rundown was active, use long path */
return ExfAcquireRundownProtection(RunRef);
}
/* Success */
return TRUE;
}
/*++
* @name ExReleaseRundownProtection
* INTERNAL MACRO
*
* The ExReleaseRundownProtection routine releases rundown protection for
* the specified descriptor.
*
* @param RunRef
* Pointer to a rundown reference descriptor.
*
* @return TRUE if access to the protected structure was granted, FALSE otherwise.
*
* @remarks This is the internal macro for system use only.In case the rundown
* was active, then the slow-path will be called through the exported
* function.
*
*--*/
FORCEINLINE
VOID
_ExReleaseRundownProtection(IN PEX_RUNDOWN_REF RunRef)
{
ULONG_PTR Value, NewValue;
/* Get the current value and mask the active bit */
Value = RunRef->Count &~ EX_RUNDOWN_ACTIVE;
/* Remove a reference */
NewValue = Value - EX_RUNDOWN_COUNT_INC;
/* Change the value */
NewValue = ExpChangeRundown(RunRef, NewValue, Value);
/* Check if the rundown was active */
if (NewValue != Value)
{
/* Rundown was active, use long path */
ExfReleaseRundownProtection(RunRef);
}
else
{
/* Sanity check */
ASSERT((Value >= EX_RUNDOWN_COUNT_INC) || (KeNumberProcessors > 1));
}
}
/*++
* @name ExInitializeRundownProtection
* INTERNAL MACRO
*
* The ExInitializeRundownProtection routine initializes a rundown
* protection descriptor.
*
* @param RunRef
* Pointer to a rundown reference descriptor.
*
* @return None.
*
* @remarks This is the internal macro for system use only.
*
*--*/
FORCEINLINE
VOID
_ExInitializeRundownProtection(IN PEX_RUNDOWN_REF RunRef)
{
/* Set the count to zero */
RunRef->Count = 0;
}
/*++
* @name ExWaitForRundownProtectionRelease
* INTERNAL MACRO
*
* The ExWaitForRundownProtectionRelease routine waits until the specified
* rundown descriptor has been released.
*
* @param RunRef
* Pointer to a rundown reference descriptor.
*
* @return None.
*
* @remarks This is the internal macro for system use only. If a wait is actually
* necessary, then the slow path is taken through the exported function.
*
*--*/
FORCEINLINE
VOID
_ExWaitForRundownProtectionRelease(IN PEX_RUNDOWN_REF RunRef)
{
ULONG_PTR Value;
/* Set the active bit */
Value = ExpChangeRundown(RunRef, EX_RUNDOWN_ACTIVE, 0);
if ((Value) && (Value != EX_RUNDOWN_ACTIVE))
{
/* If the the rundown wasn't already active, then take the long path */
ExfWaitForRundownProtectionRelease(RunRef);
}
}
/*++
* @name ExRundownCompleted
* INTERNAL MACRO
*
* The ExRundownCompleted routine completes the rundown of the specified
* descriptor by setting the active bit.
*
* @param RunRef
* Pointer to a rundown reference descriptor.
*
* @return None.
*
* @remarks This is the internal macro for system use only.
*
*--*/
FORCEINLINE
VOID
_ExRundownCompleted(IN PEX_RUNDOWN_REF RunRef)
{
/* Sanity check */
ASSERT((RunRef->Count & EX_RUNDOWN_ACTIVE) != 0);
/* Mark the counter as active */
ExpSetRundown(RunRef, EX_RUNDOWN_ACTIVE);
}
/* PUSHLOCKS *****************************************************************/
/* FIXME: VERIFY THESE! */
VOID
FASTCALL
ExBlockPushLock(
IN PEX_PUSH_LOCK PushLock,
IN PVOID WaitBlock
);
VOID
FASTCALL
ExfUnblockPushLock(
IN PEX_PUSH_LOCK PushLock,
IN PVOID CurrentWaitBlock
);
VOID
FASTCALL
ExWaitForUnblockPushLock(
IN PEX_PUSH_LOCK PushLock,
IN PVOID WaitBlock
);
/*++
* @name _ExInitializePushLock
* INTERNAL MACRO
*
* The _ExInitializePushLock macro initializes a PushLock.
*
* @params PushLock
* Pointer to the pushlock which is to be initialized.
*
* @return None.
*
* @remarks None.
*
*--*/
FORCEINLINE
VOID
_ExInitializePushLock(OUT PEX_PUSH_LOCK PushLock)
{
/* Set the value to 0 */
PushLock->Ptr = 0;
}
#define ExInitializePushLock _ExInitializePushLock
/*++
* @name ExAcquirePushLockExclusive
* INTERNAL MACRO
*
* The ExAcquirePushLockExclusive macro exclusively acquires a PushLock.
*
* @params PushLock
* Pointer to the pushlock which is to be acquired.
*
* @return None.
*
* @remarks The function attempts the quickest route to acquire the lock, which is
* to simply set the lock bit.
* However, if the pushlock is already shared, the slower path is taken.
*
* Callers of ExAcquirePushLockShared must be running at IRQL <= APC_LEVEL.
* This macro should usually be paired up with KeAcquireCriticalRegion.
*
*--*/
FORCEINLINE
VOID
ExAcquirePushLockExclusive(PEX_PUSH_LOCK PushLock)
{
/* Try acquiring the lock */
if (InterlockedBitTestAndSet((PLONG)PushLock, EX_PUSH_LOCK_LOCK_V))
{
/* Someone changed it, use the slow path */
ExfAcquirePushLockExclusive(PushLock);
}
/* Sanity check */
ASSERT(PushLock->Locked);
}
/*++
* @name ExTryToAcquirePushLockExclusive
* INTERNAL MACRO
*
* The ExAcquirePushLockExclusive macro exclusively acquires a PushLock.
*
* @params PushLock
* Pointer to the pushlock which is to be acquired.
*
* @return None.
*
* @remarks The function attempts the quickest route to acquire the lock, which is
* to simply set the lock bit.
* However, if the pushlock is already shared, the slower path is taken.
*
* Callers of ExAcquirePushLockShared must be running at IRQL <= APC_LEVEL.
* This macro should usually be paired up with KeAcquireCriticalRegion.
*