/** @file\r
-\r
The internal header file includes the common header files, defines\r
internal structure and functions used by Variable modules.\r
\r
-Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>\r
+Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution. The full text of the license may be found at\r
#include <Protocol/FirmwareVolumeBlock.h>\r
#include <Protocol/Variable.h>\r
#include <Protocol/VariableLock.h>\r
+#include <Protocol/VarCheck.h>\r
#include <Library/PcdLib.h>\r
#include <Library/HobLib.h>\r
#include <Library/UefiDriverEntryPoint.h>\r
#include <Library/BaseLib.h>\r
#include <Library/SynchronizationLib.h>\r
#include <Library/MemoryAllocationLib.h>\r
+#include <Library/AuthVariableLib.h>\r
+#include <Library/VarCheckLib.h>\r
#include <Guid/GlobalVariable.h>\r
#include <Guid/EventGroup.h>\r
#include <Guid/VariableFormat.h>\r
#include <Guid/SystemNvDataGuid.h>\r
#include <Guid/FaultTolerantWrite.h>\r
-#include <Guid/HardwareErrorVariable.h>\r
-\r
-#define VARIABLE_ATTRIBUTE_BS_RT (EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS)\r
-#define VARIABLE_ATTRIBUTE_NV_BS_RT (VARIABLE_ATTRIBUTE_BS_RT | EFI_VARIABLE_NON_VOLATILE)\r
-#define VARIABLE_ATTRIBUTE_NV_BS_RT_AT (VARIABLE_ATTRIBUTE_NV_BS_RT | EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)\r
+#include <Guid/VarErrorFlag.h>\r
\r
-typedef struct {\r
- CHAR16 *Name;\r
- UINT32 Attributes;\r
-} GLOBAL_VARIABLE_ENTRY;\r
+#define EFI_VARIABLE_ATTRIBUTES_MASK (EFI_VARIABLE_NON_VOLATILE | \\r
+ EFI_VARIABLE_BOOTSERVICE_ACCESS | \\r
+ EFI_VARIABLE_RUNTIME_ACCESS | \\r
+ EFI_VARIABLE_HARDWARE_ERROR_RECORD | \\r
+ EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS | \\r
+ EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS | \\r
+ EFI_VARIABLE_APPEND_WRITE)\r
\r
///\r
/// The size of a 3 character ISO639 language code.\r
EFI_PHYSICAL_ADDRESS NonVolatileVariableBase;\r
EFI_LOCK VariableServicesLock;\r
UINT32 ReentrantState;\r
+ BOOLEAN AuthFormat;\r
+ BOOLEAN AuthSupport;\r
} VARIABLE_GLOBAL;\r
\r
typedef struct {\r
VARIABLE_GLOBAL VariableGlobal;\r
UINTN VolatileLastVariableOffset;\r
UINTN NonVolatileLastVariableOffset;\r
+ UINTN CommonVariableSpace;\r
+ UINTN CommonMaxUserVariableSpace;\r
+ UINTN CommonRuntimeVariableSpace;\r
UINTN CommonVariableTotalSize;\r
+ UINTN CommonUserVariableTotalSize;\r
UINTN HwErrVariableTotalSize;\r
+ UINTN MaxVariableSize;\r
+ UINTN MaxAuthVariableSize;\r
+ UINTN ScratchBufferSize;\r
CHAR8 *PlatformLangCodes;\r
CHAR8 *LangCodes;\r
CHAR8 *PlatformLang;\r
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *FvbInstance;\r
} VARIABLE_MODULE_GLOBAL;\r
\r
-typedef struct {\r
- EFI_GUID *Guid;\r
- CHAR16 *Name;\r
- UINTN VariableSize;\r
-} VARIABLE_ENTRY_CONSISTENCY;\r
-\r
-typedef struct {\r
- EFI_GUID Guid;\r
- CHAR16 *Name;\r
- LIST_ENTRY Link;\r
-} VARIABLE_ENTRY;\r
-\r
/**\r
Flush the HOB variable to flash.\r
\r
IN VARIABLE_STORE_HEADER *VariableBuffer\r
);\r
\r
+/**\r
+ Finds variable in storage blocks of volatile and non-volatile storage areas.\r
+\r
+ This code finds variable in storage blocks of volatile and non-volatile storage areas.\r
+ If VariableName is an empty string, then we just return the first\r
+ qualified variable without comparing VariableName and VendorGuid.\r
+ If IgnoreRtCheck is TRUE, then we ignore the EFI_VARIABLE_RUNTIME_ACCESS attribute check\r
+ at runtime when searching existing variable, only VariableName and VendorGuid are compared.\r
+ Otherwise, variables without EFI_VARIABLE_RUNTIME_ACCESS are not visible at runtime.\r
+\r
+ @param[in] VariableName Name of the variable to be found.\r
+ @param[in] VendorGuid Vendor GUID to be found.\r
+ @param[out] PtrTrack VARIABLE_POINTER_TRACK structure for output,\r
+ including the range searched and the target position.\r
+ @param[in] Global Pointer to VARIABLE_GLOBAL structure, including\r
+ base of volatile variable storage area, base of\r
+ NV variable storage area, and a lock.\r
+ @param[in] IgnoreRtCheck Ignore EFI_VARIABLE_RUNTIME_ACCESS attribute\r
+ check at runtime when searching variable.\r
+\r
+ @retval EFI_INVALID_PARAMETER If VariableName is not an empty string, while\r
+ VendorGuid is NULL.\r
+ @retval EFI_SUCCESS Variable successfully found.\r
+ @retval EFI_NOT_FOUND Variable not found\r
+\r
+**/\r
+EFI_STATUS\r
+FindVariable (\r
+ IN CHAR16 *VariableName,\r
+ IN EFI_GUID *VendorGuid,\r
+ OUT VARIABLE_POINTER_TRACK *PtrTrack,\r
+ IN VARIABLE_GLOBAL *Global,\r
+ IN BOOLEAN IgnoreRtCheck\r
+ );\r
\r
/**\r
- Update the variable region with Variable information. These are the same \r
- arguments as the EFI Variable services.\r
\r
- @param[in] VariableName Name of variable.\r
+ Gets the pointer to the end of the variable storage area.\r
\r
- @param[in] VendorGuid Guid of variable.\r
+ This function gets pointer to the end of the variable storage\r
+ area, according to the input variable store header.\r
\r
- @param[in] Data Variable data.\r
+ @param VarStoreHeader Pointer to the Variable Store Header.\r
\r
- @param[in] DataSize Size of data. 0 means delete.\r
+ @return Pointer to the end of the variable storage area.\r
+\r
+**/\r
+VARIABLE_HEADER *\r
+GetEndPointer (\r
+ IN VARIABLE_STORE_HEADER *VarStoreHeader\r
+ );\r
+\r
+/**\r
+ This code gets the size of variable header.\r
+\r
+ @return Size of variable header in bytes in type UINTN.\r
+\r
+**/\r
+UINTN\r
+GetVariableHeaderSize (\r
+ VOID\r
+ );\r
+\r
+/**\r
+\r
+ This code gets the pointer to the variable name.\r
+\r
+ @param Variable Pointer to the Variable Header.\r
+\r
+ @return Pointer to Variable Name which is Unicode encoding.\r
+\r
+**/\r
+CHAR16 *\r
+GetVariableNamePtr (\r
+ IN VARIABLE_HEADER *Variable\r
+ );\r
+\r
+/**\r
+ This code gets the pointer to the variable guid.\r
+\r
+ @param Variable Pointer to the Variable Header.\r
+\r
+ @return A EFI_GUID* pointer to Vendor Guid.\r
+\r
+**/\r
+EFI_GUID *\r
+GetVendorGuidPtr (\r
+ IN VARIABLE_HEADER *Variable\r
+ );\r
+\r
+/**\r
+\r
+ This code gets the pointer to the variable data.\r
+\r
+ @param Variable Pointer to the Variable Header.\r
+\r
+ @return Pointer to Variable Data.\r
+\r
+**/\r
+UINT8 *\r
+GetVariableDataPtr (\r
+ IN VARIABLE_HEADER *Variable\r
+ );\r
+\r
+/**\r
+\r
+ This code gets the size of variable data.\r
+\r
+ @param Variable Pointer to the Variable Header.\r
\r
- @param[in] Attributes Attribues of the variable.\r
+ @return Size of variable in bytes.\r
\r
+**/\r
+UINTN\r
+DataSizeOfVariable (\r
+ IN VARIABLE_HEADER *Variable\r
+ );\r
+\r
+/**\r
+ This function is to check if the remaining variable space is enough to set\r
+ all Variables from argument list successfully. The purpose of the check\r
+ is to keep the consistency of the Variables to be in variable storage.\r
+\r
+ Note: Variables are assumed to be in same storage.\r
+ The set sequence of Variables will be same with the sequence of VariableEntry from argument list,\r
+ so follow the argument sequence to check the Variables.\r
+\r
+ @param[in] Attributes Variable attributes for Variable entries.\r
+ @param[in] Marker VA_LIST style variable argument list.\r
+ The variable argument list with type VARIABLE_ENTRY_CONSISTENCY *.\r
+ A NULL terminates the list. The VariableSize of\r
+ VARIABLE_ENTRY_CONSISTENCY is the variable data size as input.\r
+ It will be changed to variable total size as output.\r
+\r
+ @retval TRUE Have enough variable space to set the Variables successfully.\r
+ @retval FALSE No enough variable space to set the Variables successfully.\r
+\r
+**/\r
+BOOLEAN\r
+EFIAPI\r
+CheckRemainingSpaceForConsistencyInternal (\r
+ IN UINT32 Attributes,\r
+ IN VA_LIST Marker\r
+ );\r
+\r
+/**\r
+ Update the variable region with Variable information. If EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS is set,\r
+ index of associated public key is needed.\r
+\r
+ @param[in] VariableName Name of variable.\r
+ @param[in] VendorGuid Guid of variable.\r
+ @param[in] Data Variable data.\r
+ @param[in] DataSize Size of data. 0 means delete.\r
+ @param[in] Attributes Attributes of the variable.\r
+ @param[in] KeyIndex Index of associated public key.\r
+ @param[in] MonotonicCount Value of associated monotonic count.\r
@param[in, out] Variable The variable information that is used to keep track of variable usage.\r
\r
- @retval EFI_SUCCESS The update operation is success.\r
+ @param[in] TimeStamp Value of associated TimeStamp.\r
\r
+ @retval EFI_SUCCESS The update operation is success.\r
@retval EFI_OUT_OF_RESOURCES Variable region is full, cannot write other data into this region.\r
\r
**/\r
IN VOID *Data,\r
IN UINTN DataSize,\r
IN UINT32 Attributes OPTIONAL,\r
- IN OUT VARIABLE_POINTER_TRACK *Variable\r
+ IN UINT32 KeyIndex OPTIONAL,\r
+ IN UINT64 MonotonicCount OPTIONAL,\r
+ IN OUT VARIABLE_POINTER_TRACK *Variable,\r
+ IN EFI_TIME *TimeStamp OPTIONAL\r
);\r
\r
\r
/**\r
Return TRUE if ExitBootServices () has been called.\r
- \r
+\r
@retval TRUE If ExitBootServices () has been called.\r
**/\r
BOOLEAN\r
/**\r
Initializes a basic mutual exclusion lock.\r
\r
- This function initializes a basic mutual exclusion lock to the released state \r
- and returns the lock. Each lock provides mutual exclusion access at its task \r
+ This function initializes a basic mutual exclusion lock to the released state\r
+ and returns the lock. Each lock provides mutual exclusion access at its task\r
priority level. Since there is no preemption or multiprocessor support in EFI,\r
acquiring the lock only consists of raising to the locks TPL.\r
If Lock is NULL, then ASSERT().\r
IN EFI_TPL Priority\r
);\r
\r
- \r
+\r
/**\r
Acquires lock only at boot time. Simply returns at runtime.\r
\r
VOID\r
ReleaseLockOnlyAtBootTime (\r
IN EFI_LOCK *Lock\r
- ); \r
+ );\r
\r
/**\r
- Retrive the FVB protocol interface by HANDLE.\r
+ Retrieve the FVB protocol interface by HANDLE.\r
\r
@param[in] FvBlockHandle The handle of FVB protocol that provides services for\r
reading, writing, and erasing the target block.\r
@retval EFI_SUCCESS The interface information for the specified protocol was returned.\r
@retval EFI_UNSUPPORTED The device does not support the FVB protocol.\r
@retval EFI_INVALID_PARAMETER FvBlockHandle is not a valid EFI_HANDLE or FvBlock is NULL.\r
- \r
+\r
**/\r
EFI_STATUS\r
GetFvbByHandle (\r
OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvBlock\r
);\r
\r
-\r
-/**\r
- Retrive the Swap Address Range protocol interface.\r
-\r
- @param[out] SarProtocol The interface of SAR protocol\r
-\r
- @retval EFI_SUCCESS The SAR protocol instance was found and returned in SarProtocol.\r
- @retval EFI_NOT_FOUND The SAR protocol instance was not found.\r
- @retval EFI_INVALID_PARAMETER SarProtocol is NULL.\r
-\r
-**/\r
-EFI_STATUS\r
-GetSarProtocol (\r
- OUT VOID **SarProtocol\r
- );\r
-\r
/**\r
Function returns an array of handles that support the FVB protocol\r
- in a buffer allocated from pool. \r
+ in a buffer allocated from pool.\r
\r
@param[out] NumberHandles The number of handles returned in Buffer.\r
@param[out] Buffer A pointer to the buffer to return the requested\r
@retval EFI_NOT_FOUND No FVB handle was found.\r
@retval EFI_OUT_OF_RESOURCES There is not enough pool memory to store the matching results.\r
@retval EFI_INVALID_PARAMETER NumberHandles is NULL or Buffer is NULL.\r
- \r
+\r
**/\r
EFI_STATUS\r
GetFvbCountAndBuffer (\r
\r
/**\r
This function reclaims variable storage if free size is below the threshold.\r
- \r
+\r
**/\r
VOID\r
ReclaimForOS(\r
VOID\r
- ); \r
+ );\r
+\r
+/**\r
+ Get non-volatile maximum variable size.\r
\r
+ @return Non-volatile maximum variable size.\r
+\r
+**/\r
+UINTN\r
+GetNonVolatileMaxVariableSize (\r
+ VOID\r
+ );\r
\r
/**\r
Initializes variable write service after FVB was ready.\r
VariableWriteServiceInitialize (\r
VOID\r
);\r
- \r
+\r
/**\r
- Retrive the SMM Fault Tolerent Write protocol interface.\r
+ Retrieve the SMM Fault Tolerent Write protocol interface.\r
\r
@param[out] FtwProtocol The interface of SMM Ftw protocol\r
\r
\r
This code finds variable in storage blocks (Volatile or Non-Volatile).\r
\r
+ Caution: This function may receive untrusted input.\r
+ This function may be invoked in SMM mode, and datasize and data are external input.\r
+ This function will do basic validation, before parse the data.\r
+\r
@param VariableName Name of Variable to be found.\r
@param VendorGuid Variable vendor GUID.\r
@param Attributes Attribute value of the variable found.\r
@param DataSize Size of Data found. If size is less than the\r
data, this value contains the required size.\r
@param Data Data pointer.\r
- \r
+\r
@return EFI_INVALID_PARAMETER Invalid parameter.\r
@return EFI_SUCCESS Find the specified variable.\r
@return EFI_NOT_FOUND Not found.\r
OUT VOID *Data\r
);\r
\r
+/**\r
+ This code Finds the Next available variable.\r
+\r
+ Caution: This function may receive untrusted input.\r
+ This function may be invoked in SMM mode. This function will do basic validation, before parse the data.\r
+\r
+ @param[in] VariableName Pointer to variable name.\r
+ @param[in] VendorGuid Variable Vendor Guid.\r
+ @param[out] VariablePtr Pointer to variable header address.\r
+\r
+ @return EFI_SUCCESS Find the specified variable.\r
+ @return EFI_NOT_FOUND Not found.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VariableServiceGetNextVariableInternal (\r
+ IN CHAR16 *VariableName,\r
+ IN EFI_GUID *VendorGuid,\r
+ OUT VARIABLE_HEADER **VariablePtr\r
+ );\r
+\r
/**\r
\r
This code Finds the Next available variable.\r
\r
+ Caution: This function may receive untrusted input.\r
+ This function may be invoked in SMM mode. This function will do basic validation, before parse the data.\r
+\r
@param VariableNameSize Size of the variable name.\r
@param VariableName Pointer to variable name.\r
@param VendorGuid Variable Vendor Guid.\r
\r
This code sets variable in storage blocks (Volatile or Non-Volatile).\r
\r
+ Caution: This function may receive untrusted input.\r
+ This function may be invoked in SMM mode, and datasize and data are external input.\r
+ This function will do basic validation, before parse the data.\r
+ This function will parse the authentication carefully to avoid security issues, like\r
+ buffer overflow, integer overflow.\r
+ This function will check attribute carefully to avoid authentication bypass.\r
+\r
@param VariableName Name of Variable to be found.\r
@param VendorGuid Variable vendor GUID.\r
@param Attributes Attribute value of the variable found\r
\r
This code returns information about the EFI variables.\r
\r
+ Caution: This function may receive untrusted input.\r
+ This function may be invoked in SMM mode. This function will do basic validation, before parse the data.\r
+\r
@param Attributes Attributes bitmask to specify the type of variables\r
on which to return information.\r
@param MaximumVariableStorageSize Pointer to the maximum size of the storage space available\r
\r
This code returns information about the EFI variables.\r
\r
+ Caution: This function may receive untrusted input.\r
+ This function may be invoked in SMM mode. This function will do basic validation, before parse the data.\r
+\r
@param Attributes Attributes bitmask to specify the type of variables\r
on which to return information.\r
@param MaximumVariableStorageSize Pointer to the maximum size of the storage space available\r
OUT UINT64 *MaximumVariableStorageSize,\r
OUT UINT64 *RemainingVariableStorageSize,\r
OUT UINT64 *MaximumVariableSize\r
- ); \r
+ );\r
\r
/**\r
Mark a variable that will become read-only after leaving the DXE phase of execution.\r
IN EFI_GUID *VendorGuid\r
);\r
\r
+/**\r
+ Register SetVariable check handler.\r
+\r
+ @param[in] Handler Pointer to check handler.\r
+\r
+ @retval EFI_SUCCESS The SetVariable check handler was registered successfully.\r
+ @retval EFI_INVALID_PARAMETER Handler is NULL.\r
+ @retval EFI_ACCESS_DENIED EFI_END_OF_DXE_EVENT_GROUP_GUID or EFI_EVENT_GROUP_READY_TO_BOOT has\r
+ already been signaled.\r
+ @retval EFI_OUT_OF_RESOURCES There is not enough resource for the SetVariable check handler register request.\r
+ @retval EFI_UNSUPPORTED This interface is not implemented.\r
+ For example, it is unsupported in VarCheck protocol if both VarCheck and SmmVarCheck protocols are present.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VarCheckRegisterSetVariableCheckHandler (\r
+ IN VAR_CHECK_SET_VARIABLE_CHECK_HANDLER Handler\r
+ );\r
+\r
+/**\r
+ Variable property set.\r
+\r
+ @param[in] Name Pointer to the variable name.\r
+ @param[in] Guid Pointer to the vendor GUID.\r
+ @param[in] VariableProperty Pointer to the input variable property.\r
+\r
+ @retval EFI_SUCCESS The property of variable specified by the Name and Guid was set successfully.\r
+ @retval EFI_INVALID_PARAMETER Name, Guid or VariableProperty is NULL, or Name is an empty string,\r
+ or the fields of VariableProperty are not valid.\r
+ @retval EFI_ACCESS_DENIED EFI_END_OF_DXE_EVENT_GROUP_GUID or EFI_EVENT_GROUP_READY_TO_BOOT has\r
+ already been signaled.\r
+ @retval EFI_OUT_OF_RESOURCES There is not enough resource for the variable property set request.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VarCheckVariablePropertySet (\r
+ IN CHAR16 *Name,\r
+ IN EFI_GUID *Guid,\r
+ IN VAR_CHECK_VARIABLE_PROPERTY *VariableProperty\r
+ );\r
+\r
+/**\r
+ Variable property get.\r
+\r
+ @param[in] Name Pointer to the variable name.\r
+ @param[in] Guid Pointer to the vendor GUID.\r
+ @param[out] VariableProperty Pointer to the output variable property.\r
+\r
+ @retval EFI_SUCCESS The property of variable specified by the Name and Guid was got successfully.\r
+ @retval EFI_INVALID_PARAMETER Name, Guid or VariableProperty is NULL, or Name is an empty string.\r
+ @retval EFI_NOT_FOUND The property of variable specified by the Name and Guid was not found.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VarCheckVariablePropertyGet (\r
+ IN CHAR16 *Name,\r
+ IN EFI_GUID *Guid,\r
+ OUT VAR_CHECK_VARIABLE_PROPERTY *VariableProperty\r
+ );\r
+\r
+/**\r
+ Initialize variable quota.\r
+\r
+**/\r
+VOID\r
+InitializeVariableQuota (\r
+ VOID\r
+ );\r
+\r
extern VARIABLE_MODULE_GLOBAL *mVariableModuleGlobal;\r
\r
+extern AUTH_VAR_LIB_CONTEXT_OUT mAuthContextOut;\r
+\r
+/**\r
+ Finds variable in storage blocks of volatile and non-volatile storage areas.\r
+\r
+ This code finds variable in storage blocks of volatile and non-volatile storage areas.\r
+ If VariableName is an empty string, then we just return the first\r
+ qualified variable without comparing VariableName and VendorGuid.\r
+\r
+ @param[in] VariableName Name of the variable to be found.\r
+ @param[in] VendorGuid Variable vendor GUID to be found.\r
+ @param[out] AuthVariableInfo Pointer to AUTH_VARIABLE_INFO structure for\r
+ output of the variable found.\r
+\r
+ @retval EFI_INVALID_PARAMETER If VariableName is not an empty string,\r
+ while VendorGuid is NULL.\r
+ @retval EFI_SUCCESS Variable successfully found.\r
+ @retval EFI_NOT_FOUND Variable not found\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VariableExLibFindVariable (\r
+ IN CHAR16 *VariableName,\r
+ IN EFI_GUID *VendorGuid,\r
+ OUT AUTH_VARIABLE_INFO *AuthVariableInfo\r
+ );\r
+\r
+/**\r
+ Finds next variable in storage blocks of volatile and non-volatile storage areas.\r
+\r
+ This code finds next variable in storage blocks of volatile and non-volatile storage areas.\r
+ If VariableName is an empty string, then we just return the first\r
+ qualified variable without comparing VariableName and VendorGuid.\r
+\r
+ @param[in] VariableName Name of the variable to be found.\r
+ @param[in] VendorGuid Variable vendor GUID to be found.\r
+ @param[out] AuthVariableInfo Pointer to AUTH_VARIABLE_INFO structure for\r
+ output of the next variable.\r
+\r
+ @retval EFI_INVALID_PARAMETER If VariableName is not an empty string,\r
+ while VendorGuid is NULL.\r
+ @retval EFI_SUCCESS Variable successfully found.\r
+ @retval EFI_NOT_FOUND Variable not found\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VariableExLibFindNextVariable (\r
+ IN CHAR16 *VariableName,\r
+ IN EFI_GUID *VendorGuid,\r
+ OUT AUTH_VARIABLE_INFO *AuthVariableInfo\r
+ );\r
+\r
+/**\r
+ Update the variable region with Variable information.\r
+\r
+ @param[in] AuthVariableInfo Pointer AUTH_VARIABLE_INFO structure for\r
+ input of the variable.\r
+\r
+ @retval EFI_SUCCESS The update operation is success.\r
+ @retval EFI_INVALID_PARAMETER Invalid parameter.\r
+ @retval EFI_WRITE_PROTECTED Variable is write-protected.\r
+ @retval EFI_OUT_OF_RESOURCES There is not enough resource.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VariableExLibUpdateVariable (\r
+ IN AUTH_VARIABLE_INFO *AuthVariableInfo\r
+ );\r
+\r
+/**\r
+ Get scratch buffer.\r
+\r
+ @param[in, out] ScratchBufferSize Scratch buffer size. If input size is greater than\r
+ the maximum supported buffer size, this value contains\r
+ the maximum supported buffer size as output.\r
+ @param[out] ScratchBuffer Pointer to scratch buffer address.\r
+\r
+ @retval EFI_SUCCESS Get scratch buffer successfully.\r
+ @retval EFI_UNSUPPORTED If input size is greater than the maximum supported buffer size.\r
+\r
+**/\r
+EFI_STATUS\r
+EFIAPI\r
+VariableExLibGetScratchBuffer (\r
+ IN OUT UINTN *ScratchBufferSize,\r
+ OUT VOID **ScratchBuffer\r
+ );\r
+\r
+/**\r
+ This function is to check if the remaining variable space is enough to set\r
+ all Variables from argument list successfully. The purpose of the check\r
+ is to keep the consistency of the Variables to be in variable storage.\r
+\r
+ Note: Variables are assumed to be in same storage.\r
+ The set sequence of Variables will be same with the sequence of VariableEntry from argument list,\r
+ so follow the argument sequence to check the Variables.\r
+\r
+ @param[in] Attributes Variable attributes for Variable entries.\r
+ @param ... The variable argument list with type VARIABLE_ENTRY_CONSISTENCY *.\r
+ A NULL terminates the list. The VariableSize of\r
+ VARIABLE_ENTRY_CONSISTENCY is the variable data size as input.\r
+ It will be changed to variable total size as output.\r
+\r
+ @retval TRUE Have enough variable space to set the Variables successfully.\r
+ @retval FALSE No enough variable space to set the Variables successfully.\r
+\r
+**/\r
+BOOLEAN\r
+EFIAPI\r
+VariableExLibCheckRemainingSpaceForConsistency (\r
+ IN UINT32 Attributes,\r
+ ...\r
+ );\r
+\r
+/**\r
+ Return TRUE if at OS runtime.\r
+\r
+ @retval TRUE If at OS runtime.\r
+ @retval FALSE If at boot time.\r
+\r
+**/\r
+BOOLEAN\r
+EFIAPI\r
+VariableExLibAtRuntime (\r
+ VOID\r
+ );\r
+\r
#endif\r
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