3 Implement ReadOnly Variable Services required by PEIM and install
4 PEI ReadOnly Varaiable2 PPI. These services operates the non volatile storage space.
6 Copyright (c) 2006 - 2013, Intel Corporation. All rights reserved.<BR>
7 This program and the accompanying materials
8 are licensed and made available under the terms and conditions of the BSD License
9 which accompanies this distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
24 EFI_PEI_READ_ONLY_VARIABLE2_PPI mVariablePpi
= {
26 PeiGetNextVariableName
29 EFI_PEI_PPI_DESCRIPTOR mPpiListVariable
= {
30 (EFI_PEI_PPI_DESCRIPTOR_PPI
| EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST
),
31 &gEfiPeiReadOnlyVariable2PpiGuid
,
37 Provide the functionality of the variable services.
39 @param FileHandle Handle of the file being invoked.
40 Type EFI_PEI_FILE_HANDLE is defined in FfsFindNextFile().
41 @param PeiServices General purpose services available to every PEIM.
43 @retval EFI_SUCCESS If the interface could be successfully installed
44 @retval Others Returned from PeiServicesInstallPpi()
48 PeimInitializeVariableServices (
49 IN EFI_PEI_FILE_HANDLE FileHandle
,
50 IN CONST EFI_PEI_SERVICES
**PeiServices
53 return PeiServicesInstallPpi (&mPpiListVariable
);
58 Gets the pointer to the first variable header in given variable store area.
60 @param VarStoreHeader Pointer to the Variable Store Header.
62 @return Pointer to the first variable header
67 IN VARIABLE_STORE_HEADER
*VarStoreHeader
71 // The end of variable store
73 return (VARIABLE_HEADER
*) HEADER_ALIGN (VarStoreHeader
+ 1);
78 This code gets the pointer to the last variable memory pointer byte.
80 @param VarStoreHeader Pointer to the Variable Store Header.
82 @return VARIABLE_HEADER* pointer to last unavailable Variable Header.
87 IN VARIABLE_STORE_HEADER
*VarStoreHeader
91 // The end of variable store
93 return (VARIABLE_HEADER
*) HEADER_ALIGN ((UINTN
) VarStoreHeader
+ VarStoreHeader
->Size
);
98 This code checks if variable header is valid or not.
100 @param Variable Pointer to the Variable Header.
102 @retval TRUE Variable header is valid.
103 @retval FALSE Variable header is not valid.
107 IsValidVariableHeader (
108 IN VARIABLE_HEADER
*Variable
111 if (Variable
== NULL
|| Variable
->StartId
!= VARIABLE_DATA
) {
120 This code gets the size of name of variable.
122 @param Variable Pointer to the Variable Header.
124 @return Size of variable in bytes in type UINTN.
129 IN VARIABLE_HEADER
*Variable
132 if (Variable
->State
== (UINT8
) (-1) ||
133 Variable
->DataSize
== (UINT32
) (-1) ||
134 Variable
->NameSize
== (UINT32
) (-1) ||
135 Variable
->Attributes
== (UINT32
) (-1)) {
138 return (UINTN
) Variable
->NameSize
;
143 This code gets the size of data of variable.
145 @param Variable Pointer to the Variable Header.
147 @return Size of variable in bytes in type UINTN.
152 IN VARIABLE_HEADER
*Variable
155 if (Variable
->State
== (UINT8
) (-1) ||
156 Variable
->DataSize
== (UINT32
) (-1) ||
157 Variable
->NameSize
== (UINT32
) (-1) ||
158 Variable
->Attributes
== (UINT32
) (-1)) {
161 return (UINTN
) Variable
->DataSize
;
165 This code gets the pointer to the variable name.
167 @param Variable Pointer to the Variable Header.
169 @return A CHAR16* pointer to Variable Name.
174 IN VARIABLE_HEADER
*Variable
178 return (CHAR16
*) (Variable
+ 1);
183 This code gets the pointer to the variable data.
185 @param Variable Pointer to the Variable Header.
187 @return A UINT8* pointer to Variable Data.
192 IN VARIABLE_HEADER
*Variable
198 // Be careful about pad size for alignment
200 Value
= (UINTN
) GetVariableNamePtr (Variable
);
201 Value
+= NameSizeOfVariable (Variable
);
202 Value
+= GET_PAD_SIZE (NameSizeOfVariable (Variable
));
204 return (UINT8
*) Value
;
209 This code gets the pointer to the next variable header.
211 @param Variable Pointer to the Variable Header.
213 @return A VARIABLE_HEADER* pointer to next variable header.
218 IN VARIABLE_HEADER
*Variable
223 if (!IsValidVariableHeader (Variable
)) {
227 Value
= (UINTN
) GetVariableDataPtr (Variable
);
228 Value
+= DataSizeOfVariable (Variable
);
229 Value
+= GET_PAD_SIZE (DataSizeOfVariable (Variable
));
232 // Be careful about pad size for alignment
234 return (VARIABLE_HEADER
*) HEADER_ALIGN (Value
);
238 This code gets the pointer to the variable name.
240 @param VarStoreHeader Pointer to the Variable Store Header.
242 @retval EfiRaw Variable store is raw
243 @retval EfiValid Variable store is valid
244 @retval EfiInvalid Variable store is invalid
247 VARIABLE_STORE_STATUS
248 GetVariableStoreStatus (
249 IN VARIABLE_STORE_HEADER
*VarStoreHeader
253 if (CompareGuid (&VarStoreHeader
->Signature
, &gEfiVariableGuid
) &&
254 VarStoreHeader
->Format
== VARIABLE_STORE_FORMATTED
&&
255 VarStoreHeader
->State
== VARIABLE_STORE_HEALTHY
261 if (((UINT32
*)(&VarStoreHeader
->Signature
))[0] == 0xffffffff &&
262 ((UINT32
*)(&VarStoreHeader
->Signature
))[1] == 0xffffffff &&
263 ((UINT32
*)(&VarStoreHeader
->Signature
))[2] == 0xffffffff &&
264 ((UINT32
*)(&VarStoreHeader
->Signature
))[3] == 0xffffffff &&
265 VarStoreHeader
->Size
== 0xffffffff &&
266 VarStoreHeader
->Format
== 0xff &&
267 VarStoreHeader
->State
== 0xff
278 This function compares a variable with variable entries in database.
280 @param Variable Pointer to the variable in our database
281 @param VariableName Name of the variable to compare to 'Variable'
282 @param VendorGuid GUID of the variable to compare to 'Variable'
283 @param PtrTrack Variable Track Pointer structure that contains Variable Information.
285 @retval EFI_SUCCESS Found match variable
286 @retval EFI_NOT_FOUND Variable not found
290 CompareWithValidVariable (
291 IN VARIABLE_HEADER
*Variable
,
292 IN CONST CHAR16
*VariableName
,
293 IN CONST EFI_GUID
*VendorGuid
,
294 OUT VARIABLE_POINTER_TRACK
*PtrTrack
299 if (VariableName
[0] == 0) {
300 PtrTrack
->CurrPtr
= Variable
;
304 // Don't use CompareGuid function here for performance reasons.
305 // Instead we compare the GUID a UINT32 at a time and branch
306 // on the first failed comparison.
308 if ((((INT32
*) VendorGuid
)[0] == ((INT32
*) &Variable
->VendorGuid
)[0]) &&
309 (((INT32
*) VendorGuid
)[1] == ((INT32
*) &Variable
->VendorGuid
)[1]) &&
310 (((INT32
*) VendorGuid
)[2] == ((INT32
*) &Variable
->VendorGuid
)[2]) &&
311 (((INT32
*) VendorGuid
)[3] == ((INT32
*) &Variable
->VendorGuid
)[3])
313 ASSERT (NameSizeOfVariable (Variable
) != 0);
314 Point
= (VOID
*) GetVariableNamePtr (Variable
);
315 if (CompareMem (VariableName
, Point
, NameSizeOfVariable (Variable
)) == 0) {
316 PtrTrack
->CurrPtr
= Variable
;
322 return EFI_NOT_FOUND
;
326 Return the variable store header and the index table based on the Index.
328 @param Type The type of the variable store.
329 @param IndexTable Return the index table.
331 @return Pointer to the variable store header.
333 VARIABLE_STORE_HEADER
*
335 IN VARIABLE_STORE_TYPE Type
,
336 OUT VARIABLE_INDEX_TABLE
**IndexTable OPTIONAL
339 EFI_HOB_GUID_TYPE
*GuidHob
;
340 EFI_FIRMWARE_VOLUME_HEADER
*FvHeader
;
341 VARIABLE_STORE_HEADER
*VariableStoreHeader
;
343 if (IndexTable
!= NULL
) {
346 VariableStoreHeader
= NULL
;
348 case VariableStoreTypeHob
:
349 GuidHob
= GetFirstGuidHob (&gEfiVariableGuid
);
350 if (GuidHob
!= NULL
) {
351 VariableStoreHeader
= (VARIABLE_STORE_HEADER
*) GET_GUID_HOB_DATA (GuidHob
);
355 case VariableStoreTypeNv
:
356 if (GetBootModeHob () != BOOT_IN_RECOVERY_MODE
) {
358 // The content of NV storage for variable is not reliable in recovery boot mode.
360 FvHeader
= (EFI_FIRMWARE_VOLUME_HEADER
*) (UINTN
) (PcdGet64 (PcdFlashNvStorageVariableBase64
) != 0 ?
361 PcdGet64 (PcdFlashNvStorageVariableBase64
) :
362 PcdGet32 (PcdFlashNvStorageVariableBase
)
366 // Check if the Firmware Volume is not corrupted
368 if ((FvHeader
->Signature
!= EFI_FVH_SIGNATURE
) || (!CompareGuid (&gEfiSystemNvDataFvGuid
, &FvHeader
->FileSystemGuid
))) {
369 DEBUG ((EFI_D_ERROR
, "Firmware Volume for Variable Store is corrupted\n"));
373 VariableStoreHeader
= (VARIABLE_STORE_HEADER
*) ((UINT8
*) FvHeader
+ FvHeader
->HeaderLength
);
375 if (IndexTable
!= NULL
) {
376 GuidHob
= GetFirstGuidHob (&gEfiVariableIndexTableGuid
);
377 if (GuidHob
!= NULL
) {
378 *IndexTable
= GET_GUID_HOB_DATA (GuidHob
);
381 // If it's the first time to access variable region in flash, create a guid hob to record
382 // VAR_ADDED type variable info.
383 // Note that as the resource of PEI phase is limited, only store the limited number of
384 // VAR_ADDED type variables to reduce access time.
386 *IndexTable
= BuildGuidHob (&gEfiVariableIndexTableGuid
, sizeof (VARIABLE_INDEX_TABLE
));
387 (*IndexTable
)->Length
= 0;
388 (*IndexTable
)->StartPtr
= GetStartPointer (VariableStoreHeader
);
389 (*IndexTable
)->EndPtr
= GetEndPointer (VariableStoreHeader
);
390 (*IndexTable
)->GoneThrough
= 0;
401 return VariableStoreHeader
;
405 Find the variable in the specified variable store.
407 @param VariableStoreHeader Pointer to the variable store header.
408 @param IndexTable Pointer to the index table.
409 @param VariableName Name of the variable to be found
410 @param VendorGuid Vendor GUID to be found.
411 @param PtrTrack Variable Track Pointer structure that contains Variable Information.
413 @retval EFI_SUCCESS Variable found successfully
414 @retval EFI_NOT_FOUND Variable not found
415 @retval EFI_INVALID_PARAMETER Invalid variable name
420 IN VARIABLE_STORE_HEADER
*VariableStoreHeader
,
421 IN VARIABLE_INDEX_TABLE
*IndexTable
,
422 IN CONST CHAR16
*VariableName
,
423 IN CONST EFI_GUID
*VendorGuid
,
424 OUT VARIABLE_POINTER_TRACK
*PtrTrack
427 VARIABLE_HEADER
*Variable
;
428 VARIABLE_HEADER
*LastVariable
;
429 VARIABLE_HEADER
*MaxIndex
;
433 VARIABLE_HEADER
*InDeletedVariable
;
435 if (VariableStoreHeader
== NULL
) {
436 return EFI_INVALID_PARAMETER
;
439 if (GetVariableStoreStatus (VariableStoreHeader
) != EfiValid
) {
440 return EFI_UNSUPPORTED
;
443 if (~VariableStoreHeader
->Size
== 0) {
444 return EFI_NOT_FOUND
;
447 PtrTrack
->StartPtr
= GetStartPointer (VariableStoreHeader
);
448 PtrTrack
->EndPtr
= GetEndPointer (VariableStoreHeader
);
450 InDeletedVariable
= NULL
;
453 // No Variable Address equals zero, so 0 as initial value is safe.
457 if (IndexTable
!= NULL
) {
459 // traverse the variable index table to look for varible.
460 // The IndexTable->Index[Index] records the distance of two neighbouring VAR_ADDED type variables.
462 for (Offset
= 0, Index
= 0; Index
< IndexTable
->Length
; Index
++) {
463 ASSERT (Index
< sizeof (IndexTable
->Index
) / sizeof (IndexTable
->Index
[0]));
464 Offset
+= IndexTable
->Index
[Index
];
465 MaxIndex
= (VARIABLE_HEADER
*) ((UINT8
*) IndexTable
->StartPtr
+ Offset
);
466 if (CompareWithValidVariable (MaxIndex
, VariableName
, VendorGuid
, PtrTrack
) == EFI_SUCCESS
) {
467 if (PtrTrack
->CurrPtr
->State
== (VAR_IN_DELETED_TRANSITION
& VAR_ADDED
)) {
468 InDeletedVariable
= PtrTrack
->CurrPtr
;
475 if (IndexTable
->GoneThrough
!= 0) {
477 // If the table has all the existing variables indexed, return.
479 PtrTrack
->CurrPtr
= InDeletedVariable
;
480 return (PtrTrack
->CurrPtr
== NULL
) ? EFI_NOT_FOUND
: EFI_SUCCESS
;
484 if (MaxIndex
!= NULL
) {
486 // HOB exists but the variable cannot be found in HOB
487 // If not found in HOB, then let's start from the MaxIndex we've found.
489 Variable
= GetNextVariablePtr (MaxIndex
);
490 LastVariable
= MaxIndex
;
493 // Start Pointers for the variable.
494 // Actual Data Pointer where data can be written.
496 Variable
= PtrTrack
->StartPtr
;
497 LastVariable
= PtrTrack
->StartPtr
;
501 // Find the variable by walk through variable store
504 while ((Variable
< PtrTrack
->EndPtr
) && IsValidVariableHeader (Variable
)) {
505 if (Variable
->State
== VAR_ADDED
|| Variable
->State
== (VAR_IN_DELETED_TRANSITION
& VAR_ADDED
)) {
507 // Record Variable in VariableIndex HOB
509 if ((IndexTable
!= NULL
) && !StopRecord
) {
510 Offset
= (UINTN
) Variable
- (UINTN
) LastVariable
;
511 if ((Offset
> 0x0FFFF) || (IndexTable
->Length
== sizeof (IndexTable
->Index
) / sizeof (IndexTable
->Index
[0]))) {
513 // Stop to record if the distance of two neighbouring VAR_ADDED variable is larger than the allowable scope(UINT16),
514 // or the record buffer is full.
518 IndexTable
->Index
[IndexTable
->Length
++] = (UINT16
) Offset
;
519 LastVariable
= Variable
;
523 if (CompareWithValidVariable (Variable
, VariableName
, VendorGuid
, PtrTrack
) == EFI_SUCCESS
) {
524 if (PtrTrack
->CurrPtr
->State
== (VAR_IN_DELETED_TRANSITION
& VAR_ADDED
)) {
525 InDeletedVariable
= PtrTrack
->CurrPtr
;
532 Variable
= GetNextVariablePtr (Variable
);
535 // If gone through the VariableStore, that means we never find in Firmware any more.
537 if ((IndexTable
!= NULL
) && !StopRecord
) {
538 IndexTable
->GoneThrough
= 1;
541 PtrTrack
->CurrPtr
= InDeletedVariable
;
543 return (PtrTrack
->CurrPtr
== NULL
) ? EFI_NOT_FOUND
: EFI_SUCCESS
;
547 Find the variable in HOB and Non-Volatile variable storages.
549 @param VariableName Name of the variable to be found
550 @param VendorGuid Vendor GUID to be found.
551 @param PtrTrack Variable Track Pointer structure that contains Variable Information.
553 @retval EFI_SUCCESS Variable found successfully
554 @retval EFI_NOT_FOUND Variable not found
555 @retval EFI_INVALID_PARAMETER Invalid variable name
559 IN CONST CHAR16
*VariableName
,
560 IN CONST EFI_GUID
*VendorGuid
,
561 OUT VARIABLE_POINTER_TRACK
*PtrTrack
565 VARIABLE_STORE_HEADER
*VariableStoreHeader
;
566 VARIABLE_INDEX_TABLE
*IndexTable
;
567 VARIABLE_STORE_TYPE Type
;
569 if (VariableName
[0] != 0 && VendorGuid
== NULL
) {
570 return EFI_INVALID_PARAMETER
;
573 for (Type
= (VARIABLE_STORE_TYPE
) 0; Type
< VariableStoreTypeMax
; Type
++) {
574 VariableStoreHeader
= GetVariableStore (Type
, &IndexTable
);
575 Status
= FindVariableEx (
582 if (!EFI_ERROR (Status
)) {
587 return EFI_NOT_FOUND
;
591 This service retrieves a variable's value using its name and GUID.
593 Read the specified variable from the UEFI variable store. If the Data
594 buffer is too small to hold the contents of the variable, the error
595 EFI_BUFFER_TOO_SMALL is returned and DataSize is set to the required buffer
596 size to obtain the data.
598 @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
599 @param VariableName A pointer to a null-terminated string that is the variable's name.
600 @param VariableGuid A pointer to an EFI_GUID that is the variable's GUID. The combination of
601 VariableGuid and VariableName must be unique.
602 @param Attributes If non-NULL, on return, points to the variable's attributes.
603 @param DataSize On entry, points to the size in bytes of the Data buffer.
604 On return, points to the size of the data returned in Data.
605 @param Data Points to the buffer which will hold the returned variable value.
607 @retval EFI_SUCCESS The variable was read successfully.
608 @retval EFI_NOT_FOUND The variable could not be found.
609 @retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the resulting data.
610 DataSize is updated with the size required for
611 the specified variable.
612 @retval EFI_INVALID_PARAMETER VariableName, VariableGuid, DataSize or Data is NULL.
613 @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.
619 IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI
*This
,
620 IN CONST CHAR16
*VariableName
,
621 IN CONST EFI_GUID
*VariableGuid
,
622 OUT UINT32
*Attributes
,
623 IN OUT UINTN
*DataSize
,
627 VARIABLE_POINTER_TRACK Variable
;
631 if (VariableName
== NULL
|| VariableGuid
== NULL
|| DataSize
== NULL
) {
632 return EFI_INVALID_PARAMETER
;
636 // Find existing variable
638 Status
= FindVariable (VariableName
, VariableGuid
, &Variable
);
639 if (EFI_ERROR (Status
)) {
645 VarDataSize
= DataSizeOfVariable (Variable
.CurrPtr
);
646 if (*DataSize
>= VarDataSize
) {
648 return EFI_INVALID_PARAMETER
;
651 CopyMem (Data
, GetVariableDataPtr (Variable
.CurrPtr
), VarDataSize
);
653 if (Attributes
!= NULL
) {
654 *Attributes
= Variable
.CurrPtr
->Attributes
;
657 *DataSize
= VarDataSize
;
660 *DataSize
= VarDataSize
;
661 return EFI_BUFFER_TOO_SMALL
;
666 Return the next variable name and GUID.
668 This function is called multiple times to retrieve the VariableName
669 and VariableGuid of all variables currently available in the system.
670 On each call, the previous results are passed into the interface,
671 and, on return, the interface returns the data for the next
672 interface. When the entire variable list has been returned,
673 EFI_NOT_FOUND is returned.
675 @param This A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.
677 @param VariableNameSize On entry, points to the size of the buffer pointed to by VariableName.
678 On return, the size of the variable name buffer.
679 @param VariableName On entry, a pointer to a null-terminated string that is the variable's name.
680 On return, points to the next variable's null-terminated name string.
681 @param VariableGuid On entry, a pointer to an EFI_GUID that is the variable's GUID.
682 On return, a pointer to the next variable's GUID.
684 @retval EFI_SUCCESS The variable was read successfully.
685 @retval EFI_NOT_FOUND The variable could not be found.
686 @retval EFI_BUFFER_TOO_SMALL The VariableNameSize is too small for the resulting
687 data. VariableNameSize is updated with the size
688 required for the specified variable.
689 @retval EFI_INVALID_PARAMETER VariableName, VariableGuid or
690 VariableNameSize is NULL.
691 @retval EFI_DEVICE_ERROR The variable could not be retrieved because of a device error.
696 PeiGetNextVariableName (
697 IN CONST EFI_PEI_READ_ONLY_VARIABLE2_PPI
*This
,
698 IN OUT UINTN
*VariableNameSize
,
699 IN OUT CHAR16
*VariableName
,
700 IN OUT EFI_GUID
*VariableGuid
703 VARIABLE_STORE_TYPE Type
;
704 VARIABLE_POINTER_TRACK Variable
;
705 VARIABLE_POINTER_TRACK VariableInHob
;
706 VARIABLE_POINTER_TRACK VariablePtrTrack
;
707 VARIABLE_INDEX_TABLE
*IndexTable
;
710 VARIABLE_STORE_HEADER
*VariableStoreHeader
[VariableStoreTypeMax
];
712 if (VariableName
== NULL
|| VariableGuid
== NULL
|| VariableNameSize
== NULL
) {
713 return EFI_INVALID_PARAMETER
;
716 Status
= FindVariable (VariableName
, VariableGuid
, &Variable
);
717 if (Variable
.CurrPtr
== NULL
|| Status
!= EFI_SUCCESS
) {
721 if (VariableName
[0] != 0) {
723 // If variable name is not NULL, get next variable
725 Variable
.CurrPtr
= GetNextVariablePtr (Variable
.CurrPtr
);
728 VariableStoreHeader
[VariableStoreTypeHob
] = GetVariableStore (VariableStoreTypeHob
, NULL
);
729 VariableStoreHeader
[VariableStoreTypeNv
] = GetVariableStore (VariableStoreTypeNv
, NULL
);
733 // Switch from HOB to Non-Volatile.
735 while ((Variable
.CurrPtr
>= Variable
.EndPtr
) ||
736 (Variable
.CurrPtr
== NULL
) ||
737 !IsValidVariableHeader (Variable
.CurrPtr
)
740 // Find current storage index
742 for (Type
= (VARIABLE_STORE_TYPE
) 0; Type
< VariableStoreTypeMax
; Type
++) {
743 if ((VariableStoreHeader
[Type
] != NULL
) && (Variable
.StartPtr
== GetStartPointer (VariableStoreHeader
[Type
]))) {
747 ASSERT (Type
< VariableStoreTypeMax
);
749 // Switch to next storage
751 for (Type
++; Type
< VariableStoreTypeMax
; Type
++) {
752 if (VariableStoreHeader
[Type
] != NULL
) {
757 // Capture the case that
758 // 1. current storage is the last one, or
759 // 2. no further storage
761 if (Type
== VariableStoreTypeMax
) {
762 return EFI_NOT_FOUND
;
764 Variable
.StartPtr
= GetStartPointer (VariableStoreHeader
[Type
]);
765 Variable
.EndPtr
= GetEndPointer (VariableStoreHeader
[Type
]);
766 Variable
.CurrPtr
= Variable
.StartPtr
;
769 if (Variable
.CurrPtr
->State
== VAR_ADDED
|| Variable
.CurrPtr
->State
== (VAR_IN_DELETED_TRANSITION
& VAR_ADDED
)) {
770 if (Variable
.CurrPtr
->State
== (VAR_IN_DELETED_TRANSITION
& VAR_ADDED
)) {
772 // If it is a IN_DELETED_TRANSITION variable,
773 // and there is also a same ADDED one at the same time,
776 for (Type
= (VARIABLE_STORE_TYPE
) 0; Type
< VariableStoreTypeMax
; Type
++) {
777 if ((VariableStoreHeader
[Type
] != NULL
) && (Variable
.StartPtr
== GetStartPointer (VariableStoreHeader
[Type
]))) {
781 ASSERT (Type
< VariableStoreTypeMax
);
782 GetVariableStore (Type
, &IndexTable
);
783 Status
= FindVariableEx (
784 VariableStoreHeader
[Type
],
786 GetVariableNamePtr (Variable
.CurrPtr
),
787 &Variable
.CurrPtr
->VendorGuid
,
790 if (!EFI_ERROR (Status
) && VariablePtrTrack
.CurrPtr
->State
== VAR_ADDED
) {
791 Variable
.CurrPtr
= GetNextVariablePtr (Variable
.CurrPtr
);
797 // Don't return NV variable when HOB overrides it
799 if ((VariableStoreHeader
[VariableStoreTypeHob
] != NULL
) && (VariableStoreHeader
[VariableStoreTypeNv
] != NULL
) &&
800 (Variable
.StartPtr
== GetStartPointer (VariableStoreHeader
[VariableStoreTypeNv
]))
802 Status
= FindVariableEx (
803 VariableStoreHeader
[VariableStoreTypeHob
],
805 GetVariableNamePtr (Variable
.CurrPtr
),
806 &Variable
.CurrPtr
->VendorGuid
,
809 if (!EFI_ERROR (Status
)) {
810 Variable
.CurrPtr
= GetNextVariablePtr (Variable
.CurrPtr
);
815 VarNameSize
= NameSizeOfVariable (Variable
.CurrPtr
);
816 ASSERT (VarNameSize
!= 0);
818 if (VarNameSize
<= *VariableNameSize
) {
819 CopyMem (VariableName
, GetVariableNamePtr (Variable
.CurrPtr
), VarNameSize
);
821 CopyMem (VariableGuid
, &Variable
.CurrPtr
->VendorGuid
, sizeof (EFI_GUID
));
823 Status
= EFI_SUCCESS
;
825 Status
= EFI_BUFFER_TOO_SMALL
;
828 *VariableNameSize
= VarNameSize
;
834 Variable
.CurrPtr
= GetNextVariablePtr (Variable
.CurrPtr
);