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
|
/** @file
SMM Memory page management functions.
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "PiSmmCore.h"
#include <Library/SmmServicesTableLib.h>
#define TRUNCATE_TO_PAGES(a) ((a) >> EFI_PAGE_SHIFT)
LIST_ENTRY mSmmMemoryMap = INITIALIZE_LIST_HEAD_VARIABLE (mSmmMemoryMap);
//
// For GetMemoryMap()
//
#define MEMORY_MAP_SIGNATURE SIGNATURE_32('m','m','a','p')
typedef struct {
UINTN Signature;
LIST_ENTRY Link;
BOOLEAN FromStack;
EFI_MEMORY_TYPE Type;
UINT64 Start;
UINT64 End;
} MEMORY_MAP;
LIST_ENTRY gMemoryMap = INITIALIZE_LIST_HEAD_VARIABLE (gMemoryMap);
#define MAX_MAP_DEPTH 6
///
/// mMapDepth - depth of new descriptor stack
///
UINTN mMapDepth = 0;
///
/// mMapStack - space to use as temp storage to build new map descriptors
///
MEMORY_MAP mMapStack[MAX_MAP_DEPTH];
UINTN mFreeMapStack = 0;
///
/// This list maintain the free memory map list
///
LIST_ENTRY mFreeMemoryMapEntryList = INITIALIZE_LIST_HEAD_VARIABLE (mFreeMemoryMapEntryList);
/**
Allocates pages from the memory map.
@param[in] Type The type of allocation to perform.
@param[in] MemoryType The type of memory to turn the allocated pages
into.
@param[in] NumberOfPages The number of pages to allocate.
@param[out] Memory A pointer to receive the base allocated memory
address.
@param[in] AddRegion If this memory is new added region.
@param[in] NeedGuard Flag to indicate Guard page is needed
or not
@retval EFI_INVALID_PARAMETER Parameters violate checking rules defined in spec.
@retval EFI_NOT_FOUND Could not allocate pages match the requirement.
@retval EFI_OUT_OF_RESOURCES No enough pages to allocate.
@retval EFI_SUCCESS Pages successfully allocated.
**/
EFI_STATUS
SmmInternalAllocatePagesEx (
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN NumberOfPages,
OUT EFI_PHYSICAL_ADDRESS *Memory,
IN BOOLEAN AddRegion,
IN BOOLEAN NeedGuard
);
/**
Internal function. Deque a descriptor entry from the mFreeMemoryMapEntryList.
If the list is emtry, then allocate a new page to refuel the list.
Please Note this algorithm to allocate the memory map descriptor has a property
that the memory allocated for memory entries always grows, and will never really be freed.
@return The Memory map descriptor dequed from the mFreeMemoryMapEntryList
**/
MEMORY_MAP *
AllocateMemoryMapEntry (
VOID
)
{
EFI_PHYSICAL_ADDRESS Mem;
EFI_STATUS Status;
MEMORY_MAP* FreeDescriptorEntries;
MEMORY_MAP* Entry;
UINTN Index;
//DEBUG((DEBUG_INFO, "AllocateMemoryMapEntry\n"));
if (IsListEmpty (&mFreeMemoryMapEntryList)) {
//DEBUG((DEBUG_INFO, "mFreeMemoryMapEntryList is empty\n"));
//
// The list is empty, to allocate one page to refuel the list
//
Status = SmmInternalAllocatePagesEx (
AllocateAnyPages,
EfiRuntimeServicesData,
EFI_SIZE_TO_PAGES (RUNTIME_PAGE_ALLOCATION_GRANULARITY),
&Mem,
TRUE,
FALSE
);
ASSERT_EFI_ERROR (Status);
if(!EFI_ERROR (Status)) {
FreeDescriptorEntries = (MEMORY_MAP *)(UINTN)Mem;
//DEBUG((DEBUG_INFO, "New FreeDescriptorEntries - 0x%x\n", FreeDescriptorEntries));
//
// Enque the free memmory map entries into the list
//
for (Index = 0; Index< RUNTIME_PAGE_ALLOCATION_GRANULARITY / sizeof(MEMORY_MAP); Index++) {
FreeDescriptorEntries[Index].Signature = MEMORY_MAP_SIGNATURE;
InsertTailList (&mFreeMemoryMapEntryList, &FreeDescriptorEntries[Index].Link);
}
} else {
return NULL;
}
}
//
// dequeue the first descriptor from the list
//
Entry = CR (mFreeMemoryMapEntryList.ForwardLink, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
RemoveEntryList (&Entry->Link);
return Entry;
}
/**
Internal function. Moves any memory descriptors that are on the
temporary descriptor stack to heap.
**/
VOID
CoreFreeMemoryMapStack (
VOID
)
{
MEMORY_MAP *Entry;
//
// If already freeing the map stack, then return
//
if (mFreeMapStack != 0) {
ASSERT (FALSE);
return ;
}
//
// Move the temporary memory descriptor stack into pool
//
mFreeMapStack += 1;
while (mMapDepth != 0) {
//
// Deque an memory map entry from mFreeMemoryMapEntryList
//
Entry = AllocateMemoryMapEntry ();
ASSERT (Entry);
//
// Update to proper entry
//
mMapDepth -= 1;
if (mMapStack[mMapDepth].Link.ForwardLink != NULL) {
CopyMem (Entry , &mMapStack[mMapDepth], sizeof (MEMORY_MAP));
Entry->FromStack = FALSE;
//
// Move this entry to general memory
//
InsertTailList (&mMapStack[mMapDepth].Link, &Entry->Link);
RemoveEntryList (&mMapStack[mMapDepth].Link);
mMapStack[mMapDepth].Link.ForwardLink = NULL;
}
}
mFreeMapStack -= 1;
}
/**
Insert new entry from memory map.
@param[in] Link The old memory map entry to be linked.
@param[in] Start The start address of new memory map entry.
@param[in] End The end address of new memory map entry.
@param[in] Type The type of new memory map entry.
@param[in] Next If new entry is inserted to the next of old entry.
@param[in] AddRegion If this memory is new added region.
**/
VOID
InsertNewEntry (
IN LIST_ENTRY *Link,
IN UINT64 Start,
IN UINT64 End,
IN EFI_MEMORY_TYPE Type,
IN BOOLEAN Next,
IN BOOLEAN AddRegion
)
{
MEMORY_MAP *Entry;
Entry = &mMapStack[mMapDepth];
mMapDepth += 1;
ASSERT (mMapDepth < MAX_MAP_DEPTH);
Entry->FromStack = TRUE;
Entry->Signature = MEMORY_MAP_SIGNATURE;
Entry->Type = Type;
Entry->Start = Start;
Entry->End = End;
if (Next) {
InsertHeadList (Link, &Entry->Link);
} else {
InsertTailList (Link, &Entry->Link);
}
}
/**
Remove old entry from memory map.
@param[in] Entry Memory map entry to be removed.
**/
VOID
RemoveOldEntry (
IN MEMORY_MAP *Entry
)
{
RemoveEntryList (&Entry->Link);
Entry->Link.ForwardLink = NULL;
if (!Entry->FromStack) {
InsertTailList (&mFreeMemoryMapEntryList, &Entry->Link);
}
}
/**
Update SMM memory map entry.
@param[in] Type The type of allocation to perform.
@param[in] Memory The base of memory address.
@param[in] NumberOfPages The number of pages to allocate.
@param[in] AddRegion If this memory is new added region.
**/
VOID
ConvertSmmMemoryMapEntry (
IN EFI_MEMORY_TYPE Type,
IN EFI_PHYSICAL_ADDRESS Memory,
IN UINTN NumberOfPages,
IN BOOLEAN AddRegion
)
{
LIST_ENTRY *Link;
MEMORY_MAP *Entry;
MEMORY_MAP *NextEntry;
LIST_ENTRY *NextLink;
MEMORY_MAP *PreviousEntry;
LIST_ENTRY *PreviousLink;
EFI_PHYSICAL_ADDRESS Start;
EFI_PHYSICAL_ADDRESS End;
Start = Memory;
End = Memory + EFI_PAGES_TO_SIZE(NumberOfPages) - 1;
//
// Exclude memory region
//
Link = gMemoryMap.ForwardLink;
while (Link != &gMemoryMap) {
Entry = CR (Link, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
Link = Link->ForwardLink;
//
// ---------------------------------------------------
// | +----------+ +------+ +------+ +------+ |
// ---|gMemoryMep|---|Entry1|---|Entry2|---|Entry3|---
// +----------+ ^ +------+ +------+ +------+
// |
// +------+
// |EntryX|
// +------+
//
if (Entry->Start > End) {
if ((Entry->Start == End + 1) && (Entry->Type == Type)) {
Entry->Start = Start;
return ;
}
InsertNewEntry (
&Entry->Link,
Start,
End,
Type,
FALSE,
AddRegion
);
return ;
}
if ((Entry->Start <= Start) && (Entry->End >= End)) {
if (Entry->Type != Type) {
if (Entry->Start < Start) {
//
// ---------------------------------------------------
// | +----------+ +------+ +------+ +------+ |
// ---|gMemoryMep|---|Entry1|---|EntryX|---|Entry3|---
// +----------+ +------+ ^ +------+ +------+
// |
// +------+
// |EntryA|
// +------+
//
InsertNewEntry (
&Entry->Link,
Entry->Start,
Start - 1,
Entry->Type,
FALSE,
AddRegion
);
}
if (Entry->End > End) {
//
// ---------------------------------------------------
// | +----------+ +------+ +------+ +------+ |
// ---|gMemoryMep|---|Entry1|---|EntryX|---|Entry3|---
// +----------+ +------+ +------+ ^ +------+
// |
// +------+
// |EntryZ|
// +------+
//
InsertNewEntry (
&Entry->Link,
End + 1,
Entry->End,
Entry->Type,
TRUE,
AddRegion
);
}
//
// Update this node
//
Entry->Start = Start;
Entry->End = End;
Entry->Type = Type;
//
// Check adjacent
//
NextLink = Entry->Link.ForwardLink;
if (NextLink != &gMemoryMap) {
NextEntry = CR (NextLink, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
//
// ---------------------------------------------------
// | +----------+ +------+ +-----------------+ |
// ---|gMemoryMep|---|Entry1|---|EntryX Entry3|---
// +----------+ +------+ +-----------------+
//
if ((Entry->Type == NextEntry->Type) && (Entry->End + 1 == NextEntry->Start)) {
Entry->End = NextEntry->End;
RemoveOldEntry (NextEntry);
}
}
PreviousLink = Entry->Link.BackLink;
if (PreviousLink != &gMemoryMap) {
PreviousEntry = CR (PreviousLink, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
//
// ---------------------------------------------------
// | +----------+ +-----------------+ +------+ |
// ---|gMemoryMep|---|Entry1 EntryX|---|Entry3|---
// +----------+ +-----------------+ +------+
//
if ((PreviousEntry->Type == Entry->Type) && (PreviousEntry->End + 1 == Entry->Start)) {
PreviousEntry->End = Entry->End;
RemoveOldEntry (Entry);
}
}
}
return ;
}
}
//
// ---------------------------------------------------
// | +----------+ +------+ +------+ +------+ |
// ---|gMemoryMep|---|Entry1|---|Entry2|---|Entry3|---
// +----------+ +------+ +------+ +------+ ^
// |
// +------+
// |EntryX|
// +------+
//
Link = gMemoryMap.BackLink;
if (Link != &gMemoryMap) {
Entry = CR (Link, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
if ((Entry->End + 1 == Start) && (Entry->Type == Type)) {
Entry->End = End;
return ;
}
}
InsertNewEntry (
&gMemoryMap,
Start,
End,
Type,
FALSE,
AddRegion
);
return ;
}
/**
Return the count of Smm memory map entry.
@return The count of Smm memory map entry.
**/
UINTN
GetSmmMemoryMapEntryCount (
VOID
)
{
LIST_ENTRY *Link;
UINTN Count;
Count = 0;
Link = gMemoryMap.ForwardLink;
while (Link != &gMemoryMap) {
Link = Link->ForwardLink;
Count++;
}
return Count;
}
/**
Internal Function. Allocate n pages from given free page node.
@param Pages The free page node.
@param NumberOfPages Number of pages to be allocated.
@param MaxAddress Request to allocate memory below this address.
@return Memory address of allocated pages.
**/
UINTN
InternalAllocPagesOnOneNode (
IN OUT FREE_PAGE_LIST *Pages,
IN UINTN NumberOfPages,
IN UINTN MaxAddress
)
{
UINTN Top;
UINTN Bottom;
FREE_PAGE_LIST *Node;
Top = TRUNCATE_TO_PAGES (MaxAddress + 1 - (UINTN)Pages);
if (Top > Pages->NumberOfPages) {
Top = Pages->NumberOfPages;
}
Bottom = Top - NumberOfPages;
if (Top < Pages->NumberOfPages) {
Node = (FREE_PAGE_LIST*)((UINTN)Pages + EFI_PAGES_TO_SIZE (Top));
Node->NumberOfPages = Pages->NumberOfPages - Top;
InsertHeadList (&Pages->Link, &Node->Link);
}
if (Bottom > 0) {
Pages->NumberOfPages = Bottom;
} else {
RemoveEntryList (&Pages->Link);
}
return (UINTN)Pages + EFI_PAGES_TO_SIZE (Bottom);
}
/**
Internal Function. Allocate n pages from free page list below MaxAddress.
@param FreePageList The free page node.
@param NumberOfPages Number of pages to be allocated.
@param MaxAddress Request to allocate memory below this address.
@return Memory address of allocated pages.
**/
UINTN
InternalAllocMaxAddress (
IN OUT LIST_ENTRY *FreePageList,
IN UINTN NumberOfPages,
IN UINTN MaxAddress
)
{
LIST_ENTRY *Node;
FREE_PAGE_LIST *Pages;
for (Node = FreePageList->BackLink; Node != FreePageList; Node = Node->BackLink) {
Pages = BASE_CR (Node, FREE_PAGE_LIST, Link);
if (Pages->NumberOfPages >= NumberOfPages &&
(UINTN)Pages + EFI_PAGES_TO_SIZE (NumberOfPages) - 1 <= MaxAddress) {
return InternalAllocPagesOnOneNode (Pages, NumberOfPages, MaxAddress);
}
}
return (UINTN)(-1);
}
/**
Internal Function. Allocate n pages from free page list at given address.
@param FreePageList The free page node.
@param NumberOfPages Number of pages to be allocated.
@param MaxAddress Request to allocate memory below this address.
@return Memory address of allocated pages.
**/
UINTN
InternalAllocAddress (
IN OUT LIST_ENTRY *FreePageList,
IN UINTN NumberOfPages,
IN UINTN Address
)
{
UINTN EndAddress;
LIST_ENTRY *Node;
FREE_PAGE_LIST *Pages;
if ((Address & EFI_PAGE_MASK) != 0) {
return ~Address;
}
EndAddress = Address + EFI_PAGES_TO_SIZE (NumberOfPages);
for (Node = FreePageList->BackLink; Node!= FreePageList; Node = Node->BackLink) {
Pages = BASE_CR (Node, FREE_PAGE_LIST, Link);
if ((UINTN)Pages <= Address) {
if ((UINTN)Pages + EFI_PAGES_TO_SIZE (Pages->NumberOfPages) < EndAddress) {
break;
}
return InternalAllocPagesOnOneNode (Pages, NumberOfPages, EndAddress);
}
}
return ~Address;
}
/**
Allocates pages from the memory map.
@param[in] Type The type of allocation to perform.
@param[in] MemoryType The type of memory to turn the allocated pages
into.
@param[in] NumberOfPages The number of pages to allocate.
@param[out] Memory A pointer to receive the base allocated memory
address.
@param[in] AddRegion If this memory is new added region.
@param[in] NeedGuard Flag to indicate Guard page is needed
or not
@retval EFI_INVALID_PARAMETER Parameters violate checking rules defined in spec.
@retval EFI_NOT_FOUND Could not allocate pages match the requirement.
@retval EFI_OUT_OF_RESOURCES No enough pages to allocate.
@retval EFI_SUCCESS Pages successfully allocated.
**/
EFI_STATUS
SmmInternalAllocatePagesEx (
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN NumberOfPages,
OUT EFI_PHYSICAL_ADDRESS *Memory,
IN BOOLEAN AddRegion,
IN BOOLEAN NeedGuard
)
{
UINTN RequestedAddress;
if (MemoryType != EfiRuntimeServicesCode &&
MemoryType != EfiRuntimeServicesData) {
return EFI_INVALID_PARAMETER;
}
if (NumberOfPages > TRUNCATE_TO_PAGES ((UINTN)-1) + 1) {
return EFI_OUT_OF_RESOURCES;
}
//
// We don't track memory type in SMM
//
RequestedAddress = (UINTN)*Memory;
switch (Type) {
case AllocateAnyPages:
RequestedAddress = (UINTN)(-1);
case AllocateMaxAddress:
if (NeedGuard) {
*Memory = InternalAllocMaxAddressWithGuard (
&mSmmMemoryMap,
NumberOfPages,
RequestedAddress,
MemoryType
);
if (*Memory == (UINTN)-1) {
return EFI_OUT_OF_RESOURCES;
} else {
ASSERT (VerifyMemoryGuard (*Memory, NumberOfPages) == TRUE);
return EFI_SUCCESS;
}
}
*Memory = InternalAllocMaxAddress (
&mSmmMemoryMap,
NumberOfPages,
RequestedAddress
);
if (*Memory == (UINTN)-1) {
return EFI_OUT_OF_RESOURCES;
}
break;
case AllocateAddress:
*Memory = InternalAllocAddress (
&mSmmMemoryMap,
NumberOfPages,
RequestedAddress
);
if (*Memory != RequestedAddress) {
return EFI_NOT_FOUND;
}
break;
default:
return EFI_INVALID_PARAMETER;
}
//
// Update SmmMemoryMap here.
//
ConvertSmmMemoryMapEntry (MemoryType, *Memory, NumberOfPages, AddRegion);
if (!AddRegion) {
CoreFreeMemoryMapStack();
}
return EFI_SUCCESS;
}
/**
Allocates pages from the memory map.
@param[in] Type The type of allocation to perform.
@param[in] MemoryType The type of memory to turn the allocated pages
into.
@param[in] NumberOfPages The number of pages to allocate.
@param[out] Memory A pointer to receive the base allocated memory
address.
@param[in] NeedGuard Flag to indicate Guard page is needed
or not
@retval EFI_INVALID_PARAMETER Parameters violate checking rules defined in spec.
@retval EFI_NOT_FOUND Could not allocate pages match the requirement.
@retval EFI_OUT_OF_RESOURCES No enough pages to allocate.
@retval EFI_SUCCESS Pages successfully allocated.
**/
EFI_STATUS
EFIAPI
SmmInternalAllocatePages (
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN NumberOfPages,
OUT EFI_PHYSICAL_ADDRESS *Memory,
IN BOOLEAN NeedGuard
)
{
return SmmInternalAllocatePagesEx (Type, MemoryType, NumberOfPages, Memory,
FALSE, NeedGuard);
}
/**
Allocates pages from the memory map.
@param Type The type of allocation to perform.
@param MemoryType The type of memory to turn the allocated pages
into.
@param NumberOfPages The number of pages to allocate.
@param Memory A pointer to receive the base allocated memory
address.
@retval EFI_INVALID_PARAMETER Parameters violate checking rules defined in spec.
@retval EFI_NOT_FOUND Could not allocate pages match the requirement.
@retval EFI_OUT_OF_RESOURCES No enough pages to allocate.
@retval EFI_SUCCESS Pages successfully allocated.
**/
EFI_STATUS
EFIAPI
SmmAllocatePages (
IN EFI_ALLOCATE_TYPE Type,
IN EFI_MEMORY_TYPE MemoryType,
IN UINTN NumberOfPages,
OUT EFI_PHYSICAL_ADDRESS *Memory
)
{
EFI_STATUS Status;
BOOLEAN NeedGuard;
NeedGuard = IsPageTypeToGuard (MemoryType, Type);
Status = SmmInternalAllocatePages (Type, MemoryType, NumberOfPages, Memory,
NeedGuard);
if (!EFI_ERROR (Status)) {
SmmCoreUpdateProfile (
(EFI_PHYSICAL_ADDRESS) (UINTN) RETURN_ADDRESS (0),
MemoryProfileActionAllocatePages,
MemoryType,
EFI_PAGES_TO_SIZE (NumberOfPages),
(VOID *) (UINTN) *Memory,
NULL
);
}
return Status;
}
/**
Internal Function. Merge two adjacent nodes.
@param First The first of two nodes to merge.
@return Pointer to node after merge (if success) or pointer to next node (if fail).
**/
FREE_PAGE_LIST *
InternalMergeNodes (
IN FREE_PAGE_LIST *First
)
{
FREE_PAGE_LIST *Next;
Next = BASE_CR (First->Link.ForwardLink, FREE_PAGE_LIST, Link);
ASSERT (
TRUNCATE_TO_PAGES ((UINTN)Next - (UINTN)First) >= First->NumberOfPages);
if (TRUNCATE_TO_PAGES ((UINTN)Next - (UINTN)First) == First->NumberOfPages) {
First->NumberOfPages += Next->NumberOfPages;
RemoveEntryList (&Next->Link);
Next = First;
}
return Next;
}
/**
Frees previous allocated pages.
@param[in] Memory Base address of memory being freed.
@param[in] NumberOfPages The number of pages to free.
@param[in] AddRegion If this memory is new added region.
@retval EFI_NOT_FOUND Could not find the entry that covers the range.
@retval EFI_INVALID_PARAMETER Address not aligned, Address is zero or NumberOfPages is zero.
@return EFI_SUCCESS Pages successfully freed.
**/
EFI_STATUS
SmmInternalFreePagesEx (
IN EFI_PHYSICAL_ADDRESS Memory,
IN UINTN NumberOfPages,
IN BOOLEAN AddRegion
)
{
LIST_ENTRY *Node;
FREE_PAGE_LIST *Pages;
if (((Memory & EFI_PAGE_MASK) != 0) || (Memory == 0) || (NumberOfPages == 0)) {
return EFI_INVALID_PARAMETER;
}
Pages = NULL;
Node = mSmmMemoryMap.ForwardLink;
while (Node != &mSmmMemoryMap) {
Pages = BASE_CR (Node, FREE_PAGE_LIST, Link);
if (Memory < (UINTN)Pages) {
break;
}
Node = Node->ForwardLink;
}
if (Node != &mSmmMemoryMap &&
Memory + EFI_PAGES_TO_SIZE (NumberOfPages) > (UINTN)Pages) {
return EFI_INVALID_PARAMETER;
}
if (Node->BackLink != &mSmmMemoryMap) {
Pages = BASE_CR (Node->BackLink, FREE_PAGE_LIST, Link);
if ((UINTN)Pages + EFI_PAGES_TO_SIZE (Pages->NumberOfPages) > Memory) {
return EFI_INVALID_PARAMETER;
}
}
Pages = (FREE_PAGE_LIST*)(UINTN)Memory;
Pages->NumberOfPages = NumberOfPages;
InsertTailList (Node, &Pages->Link);
if (Pages->Link.BackLink != &mSmmMemoryMap) {
Pages = InternalMergeNodes (
BASE_CR (Pages->Link.BackLink, FREE_PAGE_LIST, Link)
);
}
if (Node != &mSmmMemoryMap) {
InternalMergeNodes (Pages);
}
//
// Update SmmMemoryMap here.
//
ConvertSmmMemoryMapEntry (EfiConventionalMemory, Memory, NumberOfPages, AddRegion);
if (!AddRegion) {
CoreFreeMemoryMapStack();
}
return EFI_SUCCESS;
}
/**
Frees previous allocated pages.
@param[in] Memory Base address of memory being freed.
@param[in] NumberOfPages The number of pages to free.
@param[in] IsGuarded Is the memory to free guarded or not.
@retval EFI_NOT_FOUND Could not find the entry that covers the range.
@retval EFI_INVALID_PARAMETER Address not aligned, Address is zero or NumberOfPages is zero.
@return EFI_SUCCESS Pages successfully freed.
**/
EFI_STATUS
EFIAPI
SmmInternalFreePages (
IN EFI_PHYSICAL_ADDRESS Memory,
IN UINTN NumberOfPages,
IN BOOLEAN IsGuarded
)
{
if (IsGuarded) {
return SmmInternalFreePagesExWithGuard (Memory, NumberOfPages, FALSE);
}
return SmmInternalFreePagesEx (Memory, NumberOfPages, FALSE);
}
/**
Check whether the input range is in memory map.
@param Memory Base address of memory being inputed.
@param NumberOfPages The number of pages.
@retval TRUE In memory map.
@retval FALSE Not in memory map.
**/
BOOLEAN
InMemMap (
IN EFI_PHYSICAL_ADDRESS Memory,
IN UINTN NumberOfPages
)
{
LIST_ENTRY *Link;
MEMORY_MAP *Entry;
EFI_PHYSICAL_ADDRESS Last;
Last = Memory + EFI_PAGES_TO_SIZE (NumberOfPages) - 1;
Link = gMemoryMap.ForwardLink;
while (Link != &gMemoryMap) {
Entry = CR (Link, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
Link = Link->ForwardLink;
if ((Entry->Start <= Memory) && (Entry->End >= Last)) {
return TRUE;
}
}
return FALSE;
}
/**
Frees previous allocated pages.
@param Memory Base address of memory being freed.
@param NumberOfPages The number of pages to free.
@retval EFI_NOT_FOUND Could not find the entry that covers the range.
@retval EFI_INVALID_PARAMETER Address not aligned, Address is zero or NumberOfPages is zero.
@return EFI_SUCCESS Pages successfully freed.
**/
EFI_STATUS
EFIAPI
SmmFreePages (
IN EFI_PHYSICAL_ADDRESS Memory,
IN UINTN NumberOfPages
)
{
EFI_STATUS Status;
BOOLEAN IsGuarded;
if (!InMemMap(Memory, NumberOfPages)) {
return EFI_NOT_FOUND;
}
IsGuarded = IsHeapGuardEnabled () && IsMemoryGuarded (Memory);
Status = SmmInternalFreePages (Memory, NumberOfPages, IsGuarded);
if (!EFI_ERROR (Status)) {
SmmCoreUpdateProfile (
(EFI_PHYSICAL_ADDRESS) (UINTN) RETURN_ADDRESS (0),
MemoryProfileActionFreePages,
EfiMaxMemoryType,
EFI_PAGES_TO_SIZE (NumberOfPages),
(VOID *) (UINTN) Memory,
NULL
);
}
return Status;
}
/**
Add free SMRAM region for use by memory service.
@param MemBase Base address of memory region.
@param MemLength Length of the memory region.
@param Type Memory type.
@param Attributes Memory region state.
**/
VOID
SmmAddMemoryRegion (
IN EFI_PHYSICAL_ADDRESS MemBase,
IN UINT64 MemLength,
IN EFI_MEMORY_TYPE Type,
IN UINT64 Attributes
)
{
UINTN AlignedMemBase;
//
// Add EfiRuntimeServicesData for memory regions that is already allocated, needs testing, or needs ECC initialization
//
if ((Attributes & (EFI_ALLOCATED | EFI_NEEDS_TESTING | EFI_NEEDS_ECC_INITIALIZATION)) != 0) {
Type = EfiRuntimeServicesData;
} else {
Type = EfiConventionalMemory;
}
DEBUG ((DEBUG_INFO, "SmmAddMemoryRegion\n"));
DEBUG ((DEBUG_INFO, " MemBase - 0x%lx\n", MemBase));
DEBUG ((DEBUG_INFO, " MemLength - 0x%lx\n", MemLength));
DEBUG ((DEBUG_INFO, " Type - 0x%x\n", Type));
DEBUG ((DEBUG_INFO, " Attributes - 0x%lx\n", Attributes));
//
// Align range on an EFI_PAGE_SIZE boundary
//
AlignedMemBase = (UINTN)(MemBase + EFI_PAGE_MASK) & ~EFI_PAGE_MASK;
MemLength -= AlignedMemBase - MemBase;
if (Type == EfiConventionalMemory) {
SmmInternalFreePagesEx (AlignedMemBase, TRUNCATE_TO_PAGES ((UINTN)MemLength), TRUE);
} else {
ConvertSmmMemoryMapEntry (EfiRuntimeServicesData, AlignedMemBase, TRUNCATE_TO_PAGES ((UINTN)MemLength), TRUE);
}
CoreFreeMemoryMapStack ();
}
/**
This function returns a copy of the current memory map. The map is an array of
memory descriptors, each of which describes a contiguous block of memory.
@param[in, out] MemoryMapSize A pointer to the size, in bytes, of the
MemoryMap buffer. On input, this is the size of
the buffer allocated by the caller. On output,
it is the size of the buffer returned by the
firmware if the buffer was large enough, or the
size of the buffer needed to contain the map if
the buffer was too small.
@param[in, out] MemoryMap A pointer to the buffer in which firmware places
the current memory map.
@param[out] MapKey A pointer to the location in which firmware
returns the key for the current memory map.
@param[out] DescriptorSize A pointer to the location in which firmware
returns the size, in bytes, of an individual
EFI_MEMORY_DESCRIPTOR.
@param[out] DescriptorVersion A pointer to the location in which firmware
returns the version number associated with the
EFI_MEMORY_DESCRIPTOR.
@retval EFI_SUCCESS The memory map was returned in the MemoryMap
buffer.
@retval EFI_BUFFER_TOO_SMALL The MemoryMap buffer was too small. The current
buffer size needed to hold the memory map is
returned in MemoryMapSize.
@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
**/
EFI_STATUS
EFIAPI
SmmCoreGetMemoryMap (
IN OUT UINTN *MemoryMapSize,
IN OUT EFI_MEMORY_DESCRIPTOR *MemoryMap,
OUT UINTN *MapKey,
OUT UINTN *DescriptorSize,
OUT UINT32 *DescriptorVersion
)
{
UINTN Count;
LIST_ENTRY *Link;
MEMORY_MAP *Entry;
UINTN Size;
UINTN BufferSize;
Size = sizeof (EFI_MEMORY_DESCRIPTOR);
//
// Make sure Size != sizeof(EFI_MEMORY_DESCRIPTOR). This will
// prevent people from having pointer math bugs in their code.
// now you have to use *DescriptorSize to make things work.
//
Size += sizeof(UINT64) - (Size % sizeof (UINT64));
if (DescriptorSize != NULL) {
*DescriptorSize = Size;
}
if (DescriptorVersion != NULL) {
*DescriptorVersion = EFI_MEMORY_DESCRIPTOR_VERSION;
}
Count = GetSmmMemoryMapEntryCount ();
BufferSize = Size * Count;
if (*MemoryMapSize < BufferSize) {
*MemoryMapSize = BufferSize;
return EFI_BUFFER_TOO_SMALL;
}
*MemoryMapSize = BufferSize;
if (MemoryMap == NULL) {
return EFI_INVALID_PARAMETER;
}
ZeroMem (MemoryMap, BufferSize);
Link = gMemoryMap.ForwardLink;
while (Link != &gMemoryMap) {
Entry = CR (Link, MEMORY_MAP, Link, MEMORY_MAP_SIGNATURE);
Link = Link->ForwardLink;
MemoryMap->Type = Entry->Type;
MemoryMap->PhysicalStart = Entry->Start;
MemoryMap->NumberOfPages = RShiftU64 (Entry->End - Entry->Start + 1, EFI_PAGE_SHIFT);
MemoryMap = NEXT_MEMORY_DESCRIPTOR (MemoryMap, Size);
}
return EFI_SUCCESS;
}
|