diff options
| author | gdong1 <gdong1@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-09-02 07:49:32 +0000 |
|---|---|---|
| committer | gdong1 <gdong1@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-09-02 07:49:32 +0000 |
| commit | 0c18794ea4289f03fefc7117b56740414cc0536c (patch) | |
| tree | 4e51c5cc23c69a67cead8c58464da870daa4c029 /SecurityPkg/VariableAuthenticated/EsalVariableDxeSal/Variable.c | |
| parent | 986d1dfb0813d6a7623531e85c2e2a7e1f956cf8 (diff) | |
| download | edk2-0c18794ea4289f03fefc7117b56740414cc0536c.zip edk2-0c18794ea4289f03fefc7117b56740414cc0536c.tar.gz edk2-0c18794ea4289f03fefc7117b56740414cc0536c.tar.bz2 | |
Add security package to repository.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12261 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'SecurityPkg/VariableAuthenticated/EsalVariableDxeSal/Variable.c')
| -rw-r--r-- | SecurityPkg/VariableAuthenticated/EsalVariableDxeSal/Variable.c | 3198 |
1 files changed, 3198 insertions, 0 deletions
diff --git a/SecurityPkg/VariableAuthenticated/EsalVariableDxeSal/Variable.c b/SecurityPkg/VariableAuthenticated/EsalVariableDxeSal/Variable.c new file mode 100644 index 0000000..d6c6686 --- /dev/null +++ b/SecurityPkg/VariableAuthenticated/EsalVariableDxeSal/Variable.c @@ -0,0 +1,3198 @@ +/** @file
+ The implementation of Extended SAL variable services.
+
+Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution. The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include "Variable.h"
+#include "AuthService.h"
+
+//
+// Don't use module globals after the SetVirtualAddress map is signaled
+//
+ESAL_VARIABLE_GLOBAL *mVariableModuleGlobal;
+CHAR16 *mVariableName[NUM_VAR_NAME] = {
+ L"PlatformLangCodes",
+ L"LangCodes",
+ L"PlatformLang",
+ L"Lang",
+ L"HwErrRec",
+ AUTHVAR_KEYDB_NAME,
+ EFI_SETUP_MODE_NAME,
+ EFI_PLATFORM_KEY_NAME,
+ EFI_KEY_EXCHANGE_KEY_NAME
+};
+
+GLOBAL_REMOVE_IF_UNREFERENCED VARIABLE_INFO_ENTRY *gVariableInfo = NULL;
+
+//
+// The current Hii implementation accesses this variable a larg # of times on every boot.
+// Other common variables are only accessed a single time. This is why this cache algorithm
+// only targets a single variable. Probably to get an performance improvement out of
+// a Cache you would need a cache that improves the search performance for a variable.
+//
+VARIABLE_CACHE_ENTRY mVariableCache[] = {
+ {
+ &gEfiGlobalVariableGuid,
+ L"Lang",
+ 0x00000000,
+ 0x00,
+ NULL
+ },
+ {
+ &gEfiGlobalVariableGuid,
+ L"PlatformLang",
+ 0x00000000,
+ 0x00,
+ NULL
+ }
+};
+
+/**
+ Acquires lock only at boot time. Simply returns at runtime.
+
+ This is a temperary function which will be removed when
+ EfiAcquireLock() in UefiLib can handle the call in UEFI
+ Runtimer driver in RT phase.
+ It calls EfiAcquireLock() at boot time, and simply returns
+ at runtime.
+
+ @param[in] Lock A pointer to the lock to acquire.
+
+**/
+VOID
+AcquireLockOnlyAtBootTime (
+ IN EFI_LOCK *Lock
+ )
+{
+ if (!EfiAtRuntime ()) {
+ EfiAcquireLock (Lock);
+ }
+}
+
+/**
+ Releases lock only at boot time. Simply returns at runtime.
+
+ This is a temperary function which will be removed when
+ EfiReleaseLock() in UefiLib can handle the call in UEFI
+ Runtimer driver in RT phase.
+ It calls EfiReleaseLock() at boot time, and simply returns
+ at runtime
+
+ @param[in] Lock A pointer to the lock to release.
+
+**/
+VOID
+ReleaseLockOnlyAtBootTime (
+ IN EFI_LOCK *Lock
+ )
+{
+ if (!EfiAtRuntime ()) {
+ EfiReleaseLock (Lock);
+ }
+}
+
+/**
+ Reads/Writes variable storage, volatile or non-volatile.
+
+ This function reads or writes volatile or non-volatile variable stroage.
+ For volatile storage, it performs memory copy.
+ For non-volatile storage, it accesses data on firmware storage. Data
+ area to access can span multiple firmware blocks.
+
+ @param[in] Write TRUE - Write variable store.
+ FALSE - Read variable store.
+ @param[in] Global Pointer to VARAIBLE_GLOBAL structure.
+ @param[in] Volatile TRUE - Variable is volatile.
+ FALSE - Variable is non-volatile.
+ @param[in] Instance Instance of FV Block services.
+ @param[in] StartAddress Start address of data to access.
+ @param[in] DataSize Size of data to access.
+ @param[in, out] Buffer For write, pointer to the buffer from which data is written.
+ For read, pointer to the buffer to hold the data read.
+
+ @retval EFI_SUCCESS Variable store successfully accessed.
+ @retval EFI_INVALID_PARAMETER Data area to access exceeds valid variable storage.
+
+**/
+EFI_STATUS
+AccessVariableStore (
+ IN BOOLEAN Write,
+ IN VARIABLE_GLOBAL *Global,
+ IN BOOLEAN Volatile,
+ IN UINTN Instance,
+ IN EFI_PHYSICAL_ADDRESS StartAddress,
+ IN UINT32 DataSize,
+ IN OUT VOID *Buffer
+ )
+{
+ EFI_FV_BLOCK_MAP_ENTRY *PtrBlockMapEntry;
+ UINTN BlockIndex;
+ UINTN LinearOffset;
+ UINTN CurrWriteSize;
+ UINTN CurrWritePtr;
+ UINT8 *CurrBuffer;
+ EFI_LBA LbaNumber;
+ UINTN Size;
+ EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
+ VARIABLE_STORE_HEADER *VolatileBase;
+ EFI_PHYSICAL_ADDRESS FvVolHdr;
+ EFI_STATUS Status;
+ VARIABLE_STORE_HEADER *VariableStoreHeader;
+
+ FvVolHdr = 0;
+ FwVolHeader = NULL;
+
+ if (Volatile) {
+ //
+ // If data is volatile, simply calculate the data pointer and copy memory.
+ // Data pointer should point to the actual address where data is to be
+ // accessed.
+ //
+ VolatileBase = (VARIABLE_STORE_HEADER *) ((UINTN) Global->VolatileVariableBase);
+
+ if ((StartAddress + DataSize) > ((UINTN) ((UINT8 *) VolatileBase + VolatileBase->Size))) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // For volatile variable, a simple memory copy is enough.
+ //
+ if (Write) {
+ CopyMem ((VOID *) StartAddress, Buffer, DataSize);
+ } else {
+ CopyMem (Buffer, (VOID *) StartAddress, DataSize);
+ }
+
+ return EFI_SUCCESS;
+ }
+
+ //
+ // If data is non-volatile, calculate firmware volume header and data pointer.
+ //
+ Status = (EFI_STATUS) EsalCall (
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_LO,
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_HI,
+ GetPhysicalAddressFunctionId,
+ Instance,
+ (UINT64) &FvVolHdr,
+ 0,
+ 0,
+ 0,
+ 0,
+ 0
+ ).Status;
+ ASSERT_EFI_ERROR (Status);
+
+ FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) FvVolHdr);
+ ASSERT (FwVolHeader != NULL);
+ VariableStoreHeader = (VARIABLE_STORE_HEADER *)(FwVolHeader + 1);
+
+ if ((StartAddress + DataSize) > ((EFI_PHYSICAL_ADDRESS) (UINTN) ((CHAR8 *)VariableStoreHeader + VariableStoreHeader->Size))) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ LinearOffset = (UINTN) FwVolHeader;
+ CurrWritePtr = StartAddress;
+ CurrWriteSize = DataSize;
+ CurrBuffer = Buffer;
+ LbaNumber = 0;
+
+ if (CurrWritePtr < LinearOffset) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // Traverse data blocks of this firmware storage to find the one where CurrWritePtr locates
+ //
+ for (PtrBlockMapEntry = FwVolHeader->BlockMap; PtrBlockMapEntry->NumBlocks != 0; PtrBlockMapEntry++) {
+ for (BlockIndex = 0; BlockIndex < PtrBlockMapEntry->NumBlocks; BlockIndex++) {
+ if ((CurrWritePtr >= LinearOffset) && (CurrWritePtr < LinearOffset + PtrBlockMapEntry->Length)) {
+ //
+ // Check to see if the data area to access spans multiple blocks.
+ //
+ if ((CurrWritePtr + CurrWriteSize) <= (LinearOffset + PtrBlockMapEntry->Length)) {
+ //
+ // If data area to access is contained in one block, just access and return.
+ //
+ if (Write) {
+ Status = (EFI_STATUS) EsalCall (
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_LO,
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_HI,
+ WriteFunctionId,
+ Instance,
+ LbaNumber,
+ (CurrWritePtr - LinearOffset),
+ (UINT64) &CurrWriteSize,
+ (UINT64) CurrBuffer,
+ 0,
+ 0
+ ).Status;
+ } else {
+ Status = (EFI_STATUS) EsalCall (
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_LO,
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_HI,
+ ReadFunctionId,
+ Instance,
+ LbaNumber,
+ (CurrWritePtr - LinearOffset),
+ (UINT64) &CurrWriteSize,
+ (UINT64) CurrBuffer,
+ 0,
+ 0
+ ).Status;
+ }
+ return Status;
+ } else {
+ //
+ // If data area to access spans multiple blocks, access this one and adjust for the next one.
+ //
+ Size = (UINT32) (LinearOffset + PtrBlockMapEntry->Length - CurrWritePtr);
+ if (Write) {
+ Status = (EFI_STATUS) EsalCall (
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_LO,
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_HI,
+ WriteFunctionId,
+ Instance,
+ LbaNumber,
+ (CurrWritePtr - LinearOffset),
+ (UINT64) &Size,
+ (UINT64) CurrBuffer,
+ 0,
+ 0
+ ).Status;
+ } else {
+ Status = (EFI_STATUS) EsalCall (
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_LO,
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_HI,
+ ReadFunctionId,
+ Instance,
+ LbaNumber,
+ (CurrWritePtr - LinearOffset),
+ (UINT64) &Size,
+ (UINT64) CurrBuffer,
+ 0,
+ 0
+ ).Status;
+ }
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ //
+ // Adjust for the remaining data.
+ //
+ CurrWritePtr = LinearOffset + PtrBlockMapEntry->Length;
+ CurrBuffer = CurrBuffer + Size;
+ CurrWriteSize = CurrWriteSize - Size;
+ }
+ }
+
+ LinearOffset += PtrBlockMapEntry->Length;
+ LbaNumber++;
+ }
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
+ Retrieves header of volatile or non-volatile variable stroage.
+
+ @param[in] VarStoreAddress Start address of variable storage.
+ @param[in] Volatile TRUE - Variable storage is volatile.
+ FALSE - Variable storage is non-volatile.
+ @param[in] Global Pointer to VARAIBLE_GLOBAL structure.
+ @param[in] Instance Instance of FV Block services.
+ @param[out] VarStoreHeader Pointer to VARIABLE_STORE_HEADER for output.
+
+**/
+VOID
+GetVarStoreHeader (
+ IN EFI_PHYSICAL_ADDRESS VarStoreAddress,
+ IN BOOLEAN Volatile,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINTN Instance,
+ OUT VARIABLE_STORE_HEADER *VarStoreHeader
+ )
+{
+ EFI_STATUS Status;
+
+ Status = AccessVariableStore (
+ FALSE,
+ Global,
+ Volatile,
+ Instance,
+ VarStoreAddress,
+ sizeof (VARIABLE_STORE_HEADER),
+ VarStoreHeader
+ );
+ ASSERT_EFI_ERROR (Status);
+}
+
+/**
+ Checks variable header.
+
+ This function checks if variable header is valid or not.
+
+ @param[in] VariableAddress Start address of variable header.
+ @param[in] Volatile TRUE - Variable is volatile.
+ FALSE - Variable is non-volatile.
+ @param[in] Global Pointer to VARAIBLE_GLOBAL structure.
+ @param[in] Instance Instance of FV Block services.
+ @param[out] VariableHeader Pointer to VARIABLE_HEADER for output.
+
+ @retval TRUE Variable header is valid.
+ @retval FALSE Variable header is not valid.
+
+**/
+BOOLEAN
+IsValidVariableHeader (
+ IN EFI_PHYSICAL_ADDRESS VariableAddress,
+ IN BOOLEAN Volatile,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINTN Instance,
+ OUT VARIABLE_HEADER *VariableHeader OPTIONAL
+ )
+{
+ EFI_STATUS Status;
+ VARIABLE_HEADER LocalVariableHeader;
+
+ Status = AccessVariableStore (
+ FALSE,
+ Global,
+ Volatile,
+ Instance,
+ VariableAddress,
+ sizeof (VARIABLE_HEADER),
+ &LocalVariableHeader
+ );
+
+ if (EFI_ERROR (Status) || LocalVariableHeader.StartId != VARIABLE_DATA) {
+ return FALSE;
+ }
+
+ if (VariableHeader != NULL) {
+ CopyMem (VariableHeader, &LocalVariableHeader, sizeof (VARIABLE_HEADER));
+ }
+
+ return TRUE;
+}
+
+/**
+ Gets status of variable store.
+
+ This function gets the current status of variable store.
+
+ @param[in] VarStoreHeader Pointer to header of variable store.
+
+ @retval EfiRaw Variable store status is raw.
+ @retval EfiValid Variable store status is valid.
+ @retval EfiInvalid Variable store status is invalid.
+
+**/
+VARIABLE_STORE_STATUS
+GetVariableStoreStatus (
+ IN VARIABLE_STORE_HEADER *VarStoreHeader
+ )
+{
+
+ if (CompareGuid (&VarStoreHeader->Signature, &gEfiAuthenticatedVariableGuid) &&
+ VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&
+ VarStoreHeader->State == VARIABLE_STORE_HEALTHY
+ ) {
+
+ return EfiValid;
+ } else if (((UINT32 *)(&VarStoreHeader->Signature))[0] == 0xffffffff &&
+ ((UINT32 *)(&VarStoreHeader->Signature))[1] == 0xffffffff &&
+ ((UINT32 *)(&VarStoreHeader->Signature))[2] == 0xffffffff &&
+ ((UINT32 *)(&VarStoreHeader->Signature))[3] == 0xffffffff &&
+ VarStoreHeader->Size == 0xffffffff &&
+ VarStoreHeader->Format == 0xff &&
+ VarStoreHeader->State == 0xff
+ ) {
+
+ return EfiRaw;
+ } else {
+ return EfiInvalid;
+ }
+}
+
+/**
+ Gets the size of variable name.
+
+ This function gets the size of variable name.
+ The variable is specified by its variable header.
+ If variable header contains raw data, just return 0.
+
+ @param[in] Variable Pointer to the variable header.
+
+ @return Size of variable name in bytes.
+
+**/
+UINTN
+NameSizeOfVariable (
+ IN VARIABLE_HEADER *Variable
+ )
+{
+ if (Variable->State == (UINT8) (-1) ||
+ Variable->DataSize == (UINT32) -1 ||
+ Variable->NameSize == (UINT32) -1 ||
+ Variable->Attributes == (UINT32) -1) {
+ return 0;
+ }
+ return (UINTN) Variable->NameSize;
+}
+
+/**
+ Gets the size of variable data area.
+
+ This function gets the size of variable data area.
+ The variable is specified by its variable header.
+ If variable header contains raw data, just return 0.
+
+ @param[in] Variable Pointer to the variable header.
+
+ @return Size of variable data area in bytes.
+
+**/
+UINTN
+DataSizeOfVariable (
+ IN VARIABLE_HEADER *Variable
+ )
+{
+ if (Variable->State == (UINT8) -1 ||
+ Variable->DataSize == (UINT32) -1 ||
+ Variable->NameSize == (UINT32) -1 ||
+ Variable->Attributes == (UINT32) -1) {
+ return 0;
+ }
+ return (UINTN) Variable->DataSize;
+}
+
+/**
+ Gets the pointer to variable name.
+
+ This function gets the pointer to variable name.
+ The variable is specified by its variable header.
+
+ @param[in] VariableAddress Start address of variable header.
+ @param[in] Volatile TRUE - Variable is volatile.
+ FALSE - Variable is non-volatile.
+ @param[in] Global Pointer to VARAIBLE_GLOBAL structure.
+ @param[in] Instance Instance of FV Block services.
+ @param[out] VariableName Buffer to hold variable name for output.
+
+**/
+VOID
+GetVariableNamePtr (
+ IN EFI_PHYSICAL_ADDRESS VariableAddress,
+ IN BOOLEAN Volatile,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINTN Instance,
+ OUT CHAR16 *VariableName
+ )
+{
+ EFI_STATUS Status;
+ EFI_PHYSICAL_ADDRESS Address;
+ VARIABLE_HEADER VariableHeader;
+ BOOLEAN IsValid;
+
+ IsValid = IsValidVariableHeader (VariableAddress, Volatile, Global, Instance, &VariableHeader);
+ ASSERT (IsValid);
+
+ //
+ // Name area follows variable header.
+ //
+ Address = VariableAddress + sizeof (VARIABLE_HEADER);
+
+ Status = AccessVariableStore (
+ FALSE,
+ Global,
+ Volatile,
+ Instance,
+ Address,
+ VariableHeader.NameSize,
+ VariableName
+ );
+ ASSERT_EFI_ERROR (Status);
+}
+
+/**
+ Gets the pointer to variable data area.
+
+ This function gets the pointer to variable data area.
+ The variable is specified by its variable header.
+
+ @param[in] VariableAddress Start address of variable header.
+ @param[in] Volatile TRUE - Variable is volatile.
+ FALSE - Variable is non-volatile.
+ @param[in] Global Pointer to VARAIBLE_GLOBAL structure.
+ @param[in] Instance Instance of FV Block services.
+ @param[out] VariableData Buffer to hold variable data for output.
+
+**/
+VOID
+GetVariableDataPtr (
+ IN EFI_PHYSICAL_ADDRESS VariableAddress,
+ IN BOOLEAN Volatile,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINTN Instance,
+ OUT CHAR16 *VariableData
+ )
+{
+ EFI_STATUS Status;
+ EFI_PHYSICAL_ADDRESS Address;
+ VARIABLE_HEADER VariableHeader;
+ BOOLEAN IsValid;
+
+ IsValid = IsValidVariableHeader (VariableAddress, Volatile, Global, Instance, &VariableHeader);
+ ASSERT (IsValid);
+
+ //
+ // Data area follows variable name.
+ // Be careful about pad size for alignment
+ //
+ Address = VariableAddress + sizeof (VARIABLE_HEADER);
+ Address += NameSizeOfVariable (&VariableHeader);
+ Address += GET_PAD_SIZE (NameSizeOfVariable (&VariableHeader));
+
+ Status = AccessVariableStore (
+ FALSE,
+ Global,
+ Volatile,
+ Instance,
+ Address,
+ VariableHeader.DataSize,
+ VariableData
+ );
+ ASSERT_EFI_ERROR (Status);
+}
+
+
+/**
+ Gets the pointer to the next variable header.
+
+ This function gets the pointer to the next variable header.
+ The variable is specified by its variable header.
+
+ @param[in] VariableAddress Start address of variable header.
+ @param[in] Volatile TRUE - Variable is volatile.
+ FALSE - Variable is non-volatile.
+ @param[in] Global Pointer to VARAIBLE_GLOBAL structure.
+ @param[in] Instance Instance of FV Block services.
+
+ @return Pointer to the next variable header.
+ NULL if variable header is invalid.
+
+**/
+EFI_PHYSICAL_ADDRESS
+GetNextVariablePtr (
+ IN EFI_PHYSICAL_ADDRESS VariableAddress,
+ IN BOOLEAN Volatile,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINTN Instance
+ )
+{
+ EFI_PHYSICAL_ADDRESS Address;
+ VARIABLE_HEADER VariableHeader;
+
+ if (!IsValidVariableHeader (VariableAddress, Volatile, Global, Instance, &VariableHeader)) {
+ return 0x0;
+ }
+
+ //
+ // Header of next variable follows data area of this variable
+ //
+ Address = VariableAddress + sizeof (VARIABLE_HEADER);
+ Address += NameSizeOfVariable (&VariableHeader);
+ Address += GET_PAD_SIZE (NameSizeOfVariable (&VariableHeader));
+ Address += DataSizeOfVariable (&VariableHeader);
+ Address += GET_PAD_SIZE (DataSizeOfVariable (&VariableHeader));
+
+ //
+ // Be careful about pad size for alignment
+ //
+ return HEADER_ALIGN (Address);
+}
+
+/**
+ Gets the pointer to the first variable header in given variable store area.
+
+ This function gets the pointer to the first variable header in given variable
+ store area. The variable store area is given by its start address.
+
+ @param[in] VarStoreHeaderAddress Pointer to the header of variable store area.
+
+ @return Pointer to the first variable header.
+
+**/
+EFI_PHYSICAL_ADDRESS
+GetStartPointer (
+ IN EFI_PHYSICAL_ADDRESS VarStoreHeaderAddress
+ )
+{
+ return HEADER_ALIGN (VarStoreHeaderAddress + sizeof (VARIABLE_STORE_HEADER));
+}
+
+/**
+ Gets the pointer to the end of given variable store area.
+
+ This function gets the pointer to the end of given variable store area.
+ The variable store area is given by its start address.
+
+ @param[in] VarStoreHeaderAddress Pointer to the header of variable store area.
+ @param[in] Volatile TRUE - Variable is volatile.
+ FALSE - Variable is non-volatile.
+ @param[in] Global Pointer to VARAIBLE_GLOBAL structure.
+ @param[in] Instance Instance of FV Block services.
+
+ @return Pointer to the end of given variable store area.
+
+**/
+EFI_PHYSICAL_ADDRESS
+GetEndPointer (
+ IN EFI_PHYSICAL_ADDRESS VarStoreHeaderAddress,
+ IN BOOLEAN Volatile,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINTN Instance
+ )
+{
+ EFI_STATUS Status;
+ VARIABLE_STORE_HEADER VariableStoreHeader;
+
+ Status = AccessVariableStore (
+ FALSE,
+ Global,
+ Volatile,
+ Instance,
+ VarStoreHeaderAddress,
+ sizeof (VARIABLE_STORE_HEADER),
+ &VariableStoreHeader
+ );
+
+ ASSERT_EFI_ERROR (Status);
+ return HEADER_ALIGN (VarStoreHeaderAddress + VariableStoreHeader.Size);
+}
+
+/**
+ Updates variable info entry in EFI system table for statistical information.
+
+ Routine used to track statistical information about variable usage.
+ The data is stored in the EFI system table so it can be accessed later.
+ VariableInfo.efi can dump out the table. Only Boot Services variable
+ accesses are tracked by this code. The PcdVariableCollectStatistics
+ build flag controls if this feature is enabled.
+ A read that hits in the cache will have Read and Cache true for
+ the transaction. Data is allocated by this routine, but never
+ freed.
+
+ @param[in] VariableName Name of the Variable to track.
+ @param[in] VendorGuid Guid of the Variable to track.
+ @param[in] Volatile TRUE if volatile FALSE if non-volatile.
+ @param[in] Read TRUE if GetVariable() was called.
+ @param[in] Write TRUE if SetVariable() was called.
+ @param[in] Delete TRUE if deleted via SetVariable().
+ @param[in] Cache TRUE for a cache hit.
+
+**/
+VOID
+UpdateVariableInfo (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN BOOLEAN Volatile,
+ IN BOOLEAN Read,
+ IN BOOLEAN Write,
+ IN BOOLEAN Delete,
+ IN BOOLEAN Cache
+ )
+{
+ VARIABLE_INFO_ENTRY *Entry;
+
+ if (FeaturePcdGet (PcdVariableCollectStatistics)) {
+
+ if (EfiAtRuntime ()) {
+ //
+ // Don't collect statistics at runtime
+ //
+ return;
+ }
+
+ if (gVariableInfo == NULL) {
+ //
+ // on the first call allocate a entry and place a pointer to it in
+ // the EFI System Table
+ //
+ gVariableInfo = AllocateZeroPool (sizeof (VARIABLE_INFO_ENTRY));
+ ASSERT (gVariableInfo != NULL);
+
+ CopyGuid (&gVariableInfo->VendorGuid, VendorGuid);
+ gVariableInfo->Name = AllocatePool (StrSize (VariableName));
+ ASSERT (gVariableInfo->Name != NULL);
+ StrCpy (gVariableInfo->Name, VariableName);
+ gVariableInfo->Volatile = Volatile;
+
+ gBS->InstallConfigurationTable (&gEfiAuthenticatedVariableGuid, gVariableInfo);
+ }
+
+
+ for (Entry = gVariableInfo; Entry != NULL; Entry = Entry->Next) {
+ if (CompareGuid (VendorGuid, &Entry->VendorGuid)) {
+ if (StrCmp (VariableName, Entry->Name) == 0) {
+ //
+ // Find the entry matching both variable name and vender GUID,
+ // and update counters for all types.
+ //
+ if (Read) {
+ Entry->ReadCount++;
+ }
+ if (Write) {
+ Entry->WriteCount++;
+ }
+ if (Delete) {
+ Entry->DeleteCount++;
+ }
+ if (Cache) {
+ Entry->CacheCount++;
+ }
+
+ return;
+ }
+ }
+
+ if (Entry->Next == NULL) {
+ //
+ // If the entry is not in the table add it.
+ // Next iteration of the loop will fill in the data
+ //
+ Entry->Next = AllocateZeroPool (sizeof (VARIABLE_INFO_ENTRY));
+ ASSERT (Entry->Next != NULL);
+
+ CopyGuid (&Entry->Next->VendorGuid, VendorGuid);
+ Entry->Next->Name = AllocatePool (StrSize (VariableName));
+ ASSERT (Entry->Next->Name != NULL);
+ StrCpy (Entry->Next->Name, VariableName);
+ Entry->Next->Volatile = Volatile;
+ }
+
+ }
+ }
+}
+
+/**
+ Updates variable in cache.
+
+ This function searches the variable cache. If the variable to set exists in the cache,
+ it updates the variable in cache. It has the same parameters with UEFI SetVariable()
+ service.
+
+ @param[in] VariableName A Null-terminated Unicode string that is the name of the vendor's
+ variable. Each VariableName is unique for each VendorGuid.
+ @param[in] VendorGuid A unique identifier for the vendor.
+ @param[in] Attributes Attributes bitmask to set for the variable.
+ @param[in] DataSize The size in bytes of the Data buffer. A size of zero causes the
+ variable to be deleted.
+ @param[in] Data The contents for the variable.
+
+**/
+VOID
+UpdateVariableCache (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN UINT32 Attributes,
+ IN UINTN DataSize,
+ IN VOID *Data
+ )
+{
+ VARIABLE_CACHE_ENTRY *Entry;
+ UINTN Index;
+
+ if (EfiAtRuntime ()) {
+ //
+ // Don't use the cache at runtime
+ //
+ return;
+ }
+
+ //
+ // Searches cache for the variable to update. If it exists, update it.
+ //
+ for (Index = 0, Entry = mVariableCache; Index < sizeof (mVariableCache)/sizeof (VARIABLE_CACHE_ENTRY); Index++, Entry++) {
+ if (CompareGuid (VendorGuid, Entry->Guid)) {
+ if (StrCmp (VariableName, Entry->Name) == 0) {
+ Entry->Attributes = Attributes;
+ if (DataSize == 0) {
+ //
+ // If DataSize is 0, delete the variable.
+ //
+ if (Entry->DataSize != 0) {
+ FreePool (Entry->Data);
+ }
+ Entry->DataSize = DataSize;
+ } else if (DataSize == Entry->DataSize) {
+ //
+ // If size of data does not change, simply copy data
+ //
+ CopyMem (Entry->Data, Data, DataSize);
+ } else {
+ //
+ // If size of data changes, allocate pool and copy data.
+ //
+ Entry->Data = AllocatePool (DataSize);
+ Entry->DataSize = DataSize;
+ CopyMem (Entry->Data, Data, DataSize);
+ }
+ }
+ }
+ }
+}
+
+
+/**
+ Search the cache to check if the variable is in it.
+
+ This function searches the variable cache. If the variable to find exists, return its data
+ and attributes.
+
+ @param[in] VariableName A Null-terminated Unicode string that is the name of the vendor's
+ variable. Each VariableName is unique for each VendorGuid.
+ @param[in] VendorGuid A unique identifier for the vendor
+ @param[out] Attributes Pointer to the attributes bitmask of the variable for output.
+ @param[in, out] DataSize On input, size of the buffer of Data.
+ On output, size of the variable's data.
+ @param[out] Data Pointer to the data buffer for output.
+
+ @retval EFI_SUCCESS VariableGuid & VariableName data was returned.
+ @retval EFI_NOT_FOUND No matching variable found in cache.
+ @retval EFI_BUFFER_TOO_SMALL *DataSize is smaller than size of the variable's data to return.
+
+**/
+EFI_STATUS
+FindVariableInCache (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ OUT UINT32 *Attributes OPTIONAL,
+ IN OUT UINTN *DataSize,
+ OUT VOID *Data
+ )
+{
+ VARIABLE_CACHE_ENTRY *Entry;
+ UINTN Index;
+
+ if (EfiAtRuntime ()) {
+ //
+ // Don't use the cache at runtime
+ //
+ return EFI_NOT_FOUND;
+ }
+
+ //
+ // Searches cache for the variable
+ //
+ for (Index = 0, Entry = mVariableCache; Index < sizeof (mVariableCache)/sizeof (VARIABLE_CACHE_ENTRY); Index++, Entry++) {
+ if (CompareGuid (VendorGuid, Entry->Guid)) {
+ if (StrCmp (VariableName, Entry->Name) == 0) {
+ if (Entry->DataSize == 0) {
+ //
+ // Variable has been deleted so return EFI_NOT_FOUND
+ //
+ return EFI_NOT_FOUND;
+ } else if (Entry->DataSize > *DataSize) {
+ //
+ // If buffer is too small, return the size needed and EFI_BUFFER_TOO_SMALL
+ //
+ *DataSize = Entry->DataSize;
+ return EFI_BUFFER_TOO_SMALL;
+ } else {
+ //
+ // If buffer is large enough, return the data
+ //
+ *DataSize = Entry->DataSize;
+ CopyMem (Data, Entry->Data, Entry->DataSize);
+ //
+ // If Attributes is not NULL, return the variable's attribute.
+ //
+ if (Attributes != NULL) {
+ *Attributes = Entry->Attributes;
+ }
+ return EFI_SUCCESS;
+ }
+ }
+ }
+ }
+
+ return EFI_NOT_FOUND;
+}
+
+/**
+ Finds variable in volatile and non-volatile storage areas.
+
+ This code finds variable in volatile and non-volatile storage areas.
+ If VariableName is an empty string, then we just return the first
+ qualified variable without comparing VariableName and VendorGuid.
+ Otherwise, VariableName and VendorGuid are compared.
+
+ @param[in] VariableName Name of the variable to be found.
+ @param[in] VendorGuid Vendor GUID to be found.
+ @param[out] PtrTrack VARIABLE_POINTER_TRACK structure for output,
+ including the range searched and the target position.
+ @param[in] Global Pointer to VARIABLE_GLOBAL structure, including
+ base of volatile variable storage area, base of
+ NV variable storage area, and a lock.
+ @param[in] Instance Instance of FV Block services.
+
+ @retval EFI_INVALID_PARAMETER If VariableName is not an empty string, while
+ VendorGuid is NULL.
+ @retval EFI_SUCCESS Variable successfully found.
+ @retval EFI_INVALID_PARAMETER Variable not found.
+
+**/
+EFI_STATUS
+FindVariable (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ OUT VARIABLE_POINTER_TRACK *PtrTrack,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINTN Instance
+ )
+{
+ EFI_PHYSICAL_ADDRESS Variable[2];
+ EFI_PHYSICAL_ADDRESS InDeletedVariable;
+ EFI_PHYSICAL_ADDRESS VariableStoreHeader[2];
+ UINTN InDeletedStorageIndex;
+ UINTN Index;
+ CHAR16 LocalVariableName[MAX_NAME_SIZE];
+ BOOLEAN Volatile;
+ VARIABLE_HEADER VariableHeader;
+
+ //
+ // 0: Volatile, 1: Non-Volatile
+ // The index and attributes mapping must be kept in this order as RuntimeServiceGetNextVariableName
+ // make use of this mapping to implement search algorithme.
+ //
+ VariableStoreHeader[0] = Global->VolatileVariableBase;
+ VariableStoreHeader[1] = Global->NonVolatileVariableBase;
+
+ //
+ // Start Pointers for the variable.
+ // Actual Data Pointer where data can be written.
+ //
+ Variable[0] = GetStartPointer (VariableStoreHeader[0]);
+ Variable[1] = GetStartPointer (VariableStoreHeader[1]);
+
+ if (VariableName[0] != 0 && VendorGuid == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // Find the variable by walk through volatile and then non-volatile variable store
+ //
+ InDeletedVariable = 0x0;
+ InDeletedStorageIndex = 0;
+ Volatile = TRUE;
+ for (Index = 0; Index < 2; Index++) {
+ if (Index == 1) {
+ Volatile = FALSE;
+ }
+ while (IsValidVariableHeader (Variable[Index], Volatile, Global, Instance, &VariableHeader)) {
+ if (VariableHeader.State == VAR_ADDED ||
+ VariableHeader.State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)
+ ) {
+ if (!EfiAtRuntime () || ((VariableHeader.Attributes & EFI_VARIABLE_RUNTIME_ACCESS) != 0)) {
+ if (VariableName[0] == 0) {
+ //
+ // If VariableName is an empty string, then we just find the first qualified variable
+ // without comparing VariableName and VendorGuid
+ //
+ if (VariableHeader.State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
+ //
+ // If variable is in delete transition, record it.
+ //
+ InDeletedVariable = Variable[Index];
+ InDeletedStorageIndex = Index;
+ } else {
+ //
+ // If variable is not in delete transition, return it.
+ //
+ PtrTrack->StartPtr = GetStartPointer (VariableStoreHeader[Index]);
+ PtrTrack->EndPtr = GetEndPointer (VariableStoreHeader[Index], Volatile, Global, Instance);
+ PtrTrack->CurrPtr = Variable[Index];
+ PtrTrack->Volatile = Volatile;
+
+ return EFI_SUCCESS;
+ }
+ } else {
+ //
+ // If VariableName is not an empty string, then VariableName and VendorGuid are compared.
+ //
+ if (CompareGuid (VendorGuid, &VariableHeader.VendorGuid)) {
+ GetVariableNamePtr (
+ Variable[Index],
+ Volatile,
+ Global,
+ Instance,
+ LocalVariableName
+ );
+
+ ASSERT (NameSizeOfVariable (&VariableHeader) != 0);
+ if (CompareMem (VariableName, LocalVariableName, NameSizeOfVariable (&VariableHeader)) == 0) {
+ if (VariableHeader.State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
+ //
+ // If variable is in delete transition, record it.
+ // We will use if only no VAR_ADDED variable is found.
+ //
+ InDeletedVariable = Variable[Index];
+ InDeletedStorageIndex = Index;
+ } else {
+ //
+ // If variable is not in delete transition, return it.
+ //
+ PtrTrack->StartPtr = GetStartPointer (VariableStoreHeader[Index]);
+ PtrTrack->EndPtr = GetEndPointer (VariableStoreHeader[Index], Volatile, Global, Instance);
+ PtrTrack->CurrPtr = Variable[Index];
+ PtrTrack->Volatile = Volatile;
+
+ return EFI_SUCCESS;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ Variable[Index] = GetNextVariablePtr (
+ Variable[Index],
+ Volatile,
+ Global,
+ Instance
+ );
+ }
+ if (InDeletedVariable != 0x0) {
+ //
+ // If no VAR_ADDED variable is found, and only variable in delete transition, then use this one.
+ //
+ PtrTrack->StartPtr = GetStartPointer (VariableStoreHeader[InDeletedStorageIndex]);
+ PtrTrack->EndPtr = GetEndPointer (
+ VariableStoreHeader[InDeletedStorageIndex],
+ (BOOLEAN)(InDeletedStorageIndex == 0),
+ Global,
+ Instance
+ );
+ PtrTrack->CurrPtr = InDeletedVariable;
+ PtrTrack->Volatile = (BOOLEAN)(InDeletedStorageIndex == 0);
+ return EFI_SUCCESS;
+ }
+ }
+ PtrTrack->CurrPtr = 0x0;
+ return EFI_NOT_FOUND;
+}
+
+/**
+ Variable store garbage collection and reclaim operation.
+
+ @param[in] VariableBase Base address of variable store area.
+ @param[out] LastVariableOffset Offset of last variable.
+ @param[in] IsVolatile The variable store is volatile or not,
+ if it is non-volatile, need FTW.
+ @param[in] VirtualMode Current calling mode for this function.
+ @param[in] Global Context of this Extended SAL Variable Services Class call.
+ @param[in] UpdatingVariable Pointer to header of the variable that is being updated.
+
+ @retval EFI_SUCCESS Variable store successfully reclaimed.
+ @retval EFI_OUT_OF_RESOURCES Fail to allocate memory buffer to hold all valid variables.
+
+**/
+EFI_STATUS
+Reclaim (
+ IN EFI_PHYSICAL_ADDRESS VariableBase,
+ OUT UINTN *LastVariableOffset,
+ IN BOOLEAN IsVolatile,
+ IN BOOLEAN VirtualMode,
+ IN ESAL_VARIABLE_GLOBAL *Global,
+ IN EFI_PHYSICAL_ADDRESS UpdatingVariable
+ )
+{
+ EFI_PHYSICAL_ADDRESS Variable;
+ EFI_PHYSICAL_ADDRESS AddedVariable;
+ EFI_PHYSICAL_ADDRESS NextVariable;
+ EFI_PHYSICAL_ADDRESS NextAddedVariable;
+ VARIABLE_STORE_HEADER VariableStoreHeader;
+ VARIABLE_HEADER VariableHeader;
+ VARIABLE_HEADER AddedVariableHeader;
+ CHAR16 VariableName[MAX_NAME_SIZE];
+ CHAR16 AddedVariableName[MAX_NAME_SIZE];
+ UINT8 *ValidBuffer;
+ UINTN MaximumBufferSize;
+ UINTN VariableSize;
+ UINTN NameSize;
+ UINT8 *CurrPtr;
+ BOOLEAN FoundAdded;
+ EFI_STATUS Status;
+ VARIABLE_GLOBAL *VariableGlobal;
+ UINT32 Instance;
+
+ VariableGlobal = &Global->VariableGlobal[VirtualMode];
+ Instance = Global->FvbInstance;
+
+ GetVarStoreHeader (VariableBase, IsVolatile, VariableGlobal, Instance, &VariableStoreHeader);
+ //
+ // recaluate the total size of Common/HwErr type variables in non-volatile area.
+ //
+ if (!IsVolatile) {
+ Global->CommonVariableTotalSize = 0;
+ Global->HwErrVariableTotalSize = 0;
+ }
+
+ //
+ // Calculate the size of buffer needed to gather all valid variables
+ //
+ Variable = GetStartPointer (VariableBase);
+ MaximumBufferSize = sizeof (VARIABLE_STORE_HEADER);
+
+ while (IsValidVariableHeader (Variable, IsVolatile, VariableGlobal, Instance, &VariableHeader)) {
+ NextVariable = GetNextVariablePtr (Variable, IsVolatile, VariableGlobal, Instance);
+ //
+ // Collect VAR_ADDED variables, and variables in delete transition status.
+ //
+ if (VariableHeader.State == VAR_ADDED ||
+ VariableHeader.State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)
+ ) {
+ VariableSize = NextVariable - Variable;
+ MaximumBufferSize += VariableSize;
+ }
+
+ Variable = NextVariable;
+ }
+
+ //
+ // Reserve the 1 Bytes with Oxff to identify the
+ // end of the variable buffer.
+ //
+ MaximumBufferSize += 1;
+ ValidBuffer = AllocatePool (MaximumBufferSize);
+ if (ValidBuffer == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ SetMem (ValidBuffer, MaximumBufferSize, 0xff);
+
+ //
+ // Copy variable store header
+ //
+ CopyMem (ValidBuffer, &VariableStoreHeader, sizeof (VARIABLE_STORE_HEADER));
+ CurrPtr = (UINT8 *) GetStartPointer ((EFI_PHYSICAL_ADDRESS) ValidBuffer);
+
+ //
+ // Reinstall all ADDED variables
+ //
+ Variable = GetStartPointer (VariableBase);
+ while (IsValidVariableHeader (Variable, IsVolatile, VariableGlobal, Instance, &VariableHeader)) {
+ NextVariable = GetNextVariablePtr (Variable, IsVolatile, VariableGlobal, Instance);
+ if (VariableHeader.State == VAR_ADDED) {
+ VariableSize = NextVariable - Variable;
+ CopyMem (CurrPtr, (UINT8 *) Variable, VariableSize);
+ CurrPtr += VariableSize;
+ if ((!IsVolatile) && ((((VARIABLE_HEADER*)Variable)->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
+ Global->HwErrVariableTotalSize += VariableSize;
+ } else if ((!IsVolatile) && ((((VARIABLE_HEADER*)Variable)->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
+ Global->CommonVariableTotalSize += VariableSize;
+ }
+ }
+ Variable = NextVariable;
+ }
+ //
+ // Reinstall in delete transition variables
+ //
+ Variable = GetStartPointer (VariableBase);
+ while (IsValidVariableHeader (Variable, IsVolatile, VariableGlobal, Instance, &VariableHeader)) {
+ NextVariable = GetNextVariablePtr (Variable, IsVolatile, VariableGlobal, Instance);
+ if (VariableHeader.State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
+
+ //
+ // Buffer has cached all ADDED variable.
+ // Per IN_DELETED variable, we have to guarantee that
+ // no ADDED one in previous buffer.
+ //
+ FoundAdded = FALSE;
+ AddedVariable = GetStartPointer ((EFI_PHYSICAL_ADDRESS) ValidBuffer);
+ while (IsValidVariableHeader (AddedVariable, IsVolatile, VariableGlobal, Instance, &AddedVariableHeader)) {
+ NextAddedVariable = GetNextVariablePtr (AddedVariable, IsVolatile, VariableGlobal, Instance);
+ NameSize = NameSizeOfVariable (&AddedVariableHeader);
+ if (CompareGuid (&AddedVariableHeader.VendorGuid, &VariableHeader.VendorGuid) &&
+ NameSize == NameSizeOfVariable (&VariableHeader)
+ ) {
+ GetVariableNamePtr (Variable, IsVolatile, VariableGlobal, Instance, VariableName);
+ GetVariableNamePtr (AddedVariable, IsVolatile, VariableGlobal, Instance, AddedVariableName);
+ if (CompareMem (VariableName, AddedVariableName, NameSize) == 0) {
+ //
+ // If ADDED variable with the same name and vender GUID has been reinstalled,
+ // then discard this IN_DELETED copy.
+ //
+ FoundAdded = TRUE;
+ break;
+ }
+ }
+ AddedVariable = NextAddedVariable;
+ }
+ //
+ // Add IN_DELETE variables that have not been added to buffer
+ //
+ if (!FoundAdded) {
+ VariableSize = NextVariable - Variable;
+ CopyMem (CurrPtr, (UINT8 *) Variable, VariableSize);
+ if (Variable != UpdatingVariable) {
+ //
+ // Make this IN_DELETE instance valid if:
+ // 1. No valid instance of this variable exists.
+ // 2. It is not the variable that is going to be updated.
+ //
+ ((VARIABLE_HEADER *) CurrPtr)->State = VAR_ADDED;
+ }
+ CurrPtr += VariableSize;
+ if ((!IsVolatile) && ((((VARIABLE_HEADER*)Variable)->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
+ Global->HwErrVariableTotalSize += VariableSize;
+ } else if ((!IsVolatile) && ((((VARIABLE_HEADER*)Variable)->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
+ Global->CommonVariableTotalSize += VariableSize;
+ }
+ }
+ }
+ Variable = NextVariable;
+ }
+
+ if (IsVolatile) {
+ //
+ // If volatile variable store, just copy valid buffer
+ //
+ SetMem ((UINT8 *) (UINTN) VariableBase, VariableStoreHeader.Size, 0xff);
+ CopyMem ((UINT8 *) (UINTN) VariableBase, ValidBuffer, (UINTN) (CurrPtr - (UINT8 *) ValidBuffer));
+ Status = EFI_SUCCESS;
+ } else {
+ //
+ // If non-volatile variable store, perform FTW here.
+ // Write ValidBuffer to destination specified by VariableBase.
+ //
+ Status = FtwVariableSpace (
+ VariableBase,
+ ValidBuffer,
+ (UINTN) (CurrPtr - (UINT8 *) ValidBuffer)
+ );
+ }
+ if (!EFI_ERROR (Status)) {
+ *LastVariableOffset = (UINTN) (CurrPtr - (UINT8 *) ValidBuffer);
+ } else {
+ *LastVariableOffset = 0;
+ }
+
+ FreePool (ValidBuffer);
+
+ return Status;
+}
+
+/**
+ Get index from supported language codes according to language string.
+
+ This code is used to get corresponding index in supported language codes. It can handle
+ RFC4646 and ISO639 language tags.
+ In ISO639 language tags, take 3-characters as a delimitation to find matched string and calculate the index.
+ In RFC4646 language tags, take semicolon as a delimitation to find matched string and calculate the index.
+
+ For example:
+ SupportedLang = "engfraengfra"
+ Lang = "eng"
+ Iso639Language = TRUE
+ The return value is "0".
+ Another example:
+ SupportedLang = "en;fr;en-US;fr-FR"
+ Lang = "fr-FR"
+ Iso639Language = FALSE
+ The return value is "3".
+
+ @param[in] SupportedLang Platform supported language codes.
+ @param[in] Lang Configured language.
+ @param[in] Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646.
+
+ @return The index of language in the language codes.
+
+**/
+UINTN
+GetIndexFromSupportedLangCodes(
+ IN CHAR8 *SupportedLang,
+ IN CHAR8 *Lang,
+ IN BOOLEAN Iso639Language
+ )
+{
+ UINTN Index;
+ UINTN CompareLength;
+ UINTN LanguageLength;
+
+ if (Iso639Language) {
+ CompareLength = ISO_639_2_ENTRY_SIZE;
+ for (Index = 0; Index < AsciiStrLen (SupportedLang); Index += CompareLength) {
+ if (AsciiStrnCmp (Lang, SupportedLang + Index, CompareLength) == 0) {
+ //
+ // Successfully find the index of Lang string in SupportedLang string.
+ //
+ Index = Index / CompareLength;
+ return Index;
+ }
+ }
+ ASSERT (FALSE);
+ return 0;
+ } else {
+ //
+ // Compare RFC4646 language code
+ //
+ Index = 0;
+ for (LanguageLength = 0; Lang[LanguageLength] != '\0'; LanguageLength++);
+
+ for (Index = 0; *SupportedLang != '\0'; Index++, SupportedLang += CompareLength) {
+ //
+ // Skip ';' characters in SupportedLang
+ //
+ for (; *SupportedLang != '\0' && *SupportedLang == ';'; SupportedLang++);
+ //
+ // Determine the length of the next language code in SupportedLang
+ //
+ for (CompareLength = 0; SupportedLang[CompareLength] != '\0' && SupportedLang[CompareLength] != ';'; CompareLength++);
+
+ if ((CompareLength == LanguageLength) &&
+ (AsciiStrnCmp (Lang, SupportedLang, CompareLength) == 0)) {
+ //
+ // Successfully find the index of Lang string in SupportedLang string.
+ //
+ return Index;
+ }
+ }
+ ASSERT (FALSE);
+ return 0;
+ }
+}
+
+/**
+ Get language string from supported language codes according to index.
+
+ This code is used to get corresponding language string in supported language codes. It can handle
+ RFC4646 and ISO639 language tags.
+ In ISO639 language tags, take 3-characters as a delimitation. Find language string according to the index.
+ In RFC4646 language tags, take semicolon as a delimitation. Find language string according to the index.
+
+ For example:
+ SupportedLang = "engfraengfra"
+ Index = "1"
+ Iso639Language = TRUE
+ The return value is "fra".
+ Another example:
+ SupportedLang = "en;fr;en-US;fr-FR"
+ Index = "1"
+ Iso639Language = FALSE
+ The return value is "fr".
+
+ @param[in] SupportedLang Platform supported language codes.
+ @param[in] Index the index in supported language codes.
+ @param[in] Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646.
+ @param[in] VirtualMode Current calling mode for this function.
+ @param[in] Global Context of this Extended SAL Variable Services Class call.
+
+ @return The language string in the language codes.
+
+**/
+CHAR8 *
+GetLangFromSupportedLangCodes (
+ IN CHAR8 *SupportedLang,
+ IN UINTN Index,
+ IN BOOLEAN Iso639Language,
+ IN BOOLEAN VirtualMode,
+ IN ESAL_VARIABLE_GLOBAL *Global
+ )
+{
+ UINTN SubIndex;
+ UINTN CompareLength;
+ CHAR8 *Supported;
+
+ SubIndex = 0;
+ Supported = SupportedLang;
+ if (Iso639Language) {
+ //
+ // according to the index of Lang string in SupportedLang string to get the language.
+ // As this code will be invoked in RUNTIME, therefore there is not memory allocate/free operation.
+ // In driver entry, it pre-allocates a runtime attribute memory to accommodate this string.
+ //
+ CompareLength = ISO_639_2_ENTRY_SIZE;
+ Global->Lang[CompareLength] = '\0';
+ return CopyMem (Global->Lang, SupportedLang + Index * CompareLength, CompareLength);
+
+ } else {
+ while (TRUE) {
+ //
+ // take semicolon as delimitation, sequentially traverse supported language codes.
+ //
+ for (CompareLength = 0; *Supported != ';' && *Supported != '\0'; CompareLength++) {
+ Supported++;
+ }
+ if ((*Supported == '\0') && (SubIndex != Index)) {
+ //
+ // Have completed the traverse, but not find corrsponding string.
+ // This case is not allowed to happen.
+ //
+ ASSERT(FALSE);
+ return NULL;
+ }
+ if (SubIndex == Index) {
+ //
+ // according to the index of Lang string in SupportedLang string to get the language.
+ // As this code will be invoked in RUNTIME, therefore there is not memory allocate/free operation.
+ // In driver entry, it pre-allocates a runtime attribute memory to accommodate this string.
+ //
+ Global->PlatformLang[VirtualMode][CompareLength] = '\0';
+ return CopyMem (Global->PlatformLang[VirtualMode], Supported - CompareLength, CompareLength);
+ }
+ SubIndex++;
+
+ //
+ // Skip ';' characters in Supported
+ //
+ for (; *Supported != '\0' && *Supported == ';'; Supported++);
+ }
+ }
+}
+
+/**
+ Returns a pointer to an allocated buffer that contains the best matching language
+ from a set of supported languages.
+
+ This function supports both ISO 639-2 and RFC 4646 language codes, but language
+ code types may not be mixed in a single call to this function. This function
+ supports a variable argument list that allows the caller to pass in a prioritized
+ list of language codes to test against all the language codes in SupportedLanguages.
+
+ If SupportedLanguages is NULL, then ASSERT().
+
+ @param[in] SupportedLanguages A pointer to a Null-terminated ASCII string that
+ contains a set of language codes in the format
+ specified by Iso639Language.
+ @param[in] Iso639Language If TRUE, then all language codes are assumed to be
+ in ISO 639-2 format. If FALSE, then all language
+ codes are assumed to be in RFC 4646 language format.
+ @param[in] VirtualMode Current calling mode for this function.
+ @param[in] ... A variable argument list that contains pointers to
+ Null-terminated ASCII strings that contain one or more
+ language codes in the format specified by Iso639Language.
+ The first language code from each of these language
+ code lists is used to determine if it is an exact or
+ close match to any of the language codes in
+ SupportedLanguages. Close matches only apply to RFC 4646
+ language codes, and the matching algorithm from RFC 4647
+ is used to determine if a close match is present. If
+ an exact or close match is found, then the matching
+ language code from SupportedLanguages is returned. If
+ no matches are found, then the next variable argument
+ parameter is evaluated. The variable argument list
+ is terminated by a NULL.
+
+ @retval NULL The best matching language could not be found in SupportedLanguages.
+ @retval NULL There are not enough resources available to return the best matching
+ language.
+ @retval Other A pointer to a Null-terminated ASCII string that is the best matching
+ language in SupportedLanguages.
+
+**/
+CHAR8 *
+VariableGetBestLanguage (
+ IN CONST CHAR8 *SupportedLanguages,
+ IN BOOLEAN Iso639Language,
+ IN BOOLEAN VirtualMode,
+ ...
+ )
+{
+ VA_LIST Args;
+ CHAR8 *Language;
+ UINTN CompareLength;
+ UINTN LanguageLength;
+ CONST CHAR8 *Supported;
+ CHAR8 *Buffer;
+
+ ASSERT (SupportedLanguages != NULL);
+
+ VA_START (Args, VirtualMode);
+ while ((Language = VA_ARG (Args, CHAR8 *)) != NULL) {
+ //
+ // Default to ISO 639-2 mode
+ //
+ CompareLength = 3;
+ LanguageLength = MIN (3, AsciiStrLen (Language));
+
+ //
+ // If in RFC 4646 mode, then determine the length of the first RFC 4646 language code in Language
+ //
+ if (!Iso639Language) {
+ for (LanguageLength = 0; Language[LanguageLength] != 0 && Language[LanguageLength] != ';'; LanguageLength++);
+ }
+
+ //
+ // Trim back the length of Language used until it is empty
+ //
+ while (LanguageLength > 0) {
+ //
+ // Loop through all language codes in SupportedLanguages
+ //
+ for (Supported = SupportedLanguages; *Supported != '\0'; Supported += CompareLength) {
+ //
+ // In RFC 4646 mode, then Loop through all language codes in SupportedLanguages
+ //
+ if (!Iso639Language) {
+ //
+ // Skip ';' characters in Supported
+ //
+ for (; *Supported != '\0' && *Supported == ';'; Supported++);
+ //
+ // Determine the length of the next language code in Supported
+ //
+ for (CompareLength = 0; Supported[CompareLength] != 0 && Supported[CompareLength] != ';'; CompareLength++);
+ //
+ // If Language is longer than the Supported, then skip to the next language
+ //
+ if (LanguageLength > CompareLength) {
+ continue;
+ }
+ }
+ //
+ // See if the first LanguageLength characters in Supported match Language
+ //
+ if (AsciiStrnCmp (Supported, Language, LanguageLength) == 0) {
+ VA_END (Args);
+
+ Buffer = Iso639Language ? mVariableModuleGlobal->Lang : mVariableModuleGlobal->PlatformLang[VirtualMode];
+ Buffer[CompareLength] = '\0';
+ return CopyMem (Buffer, Supported, CompareLength);
+ }
+ }
+
+ if (Iso639Language) {
+ //
+ // If ISO 639 mode, then each language can only be tested once
+ //
+ LanguageLength = 0;
+ } else {
+ //
+ // If RFC 4646 mode, then trim Language from the right to the next '-' character
+ //
+ for (LanguageLength--; LanguageLength > 0 && Language[LanguageLength] != '-'; LanguageLength--);
+ }
+ }
+ }
+ VA_END (Args);
+
+ //
+ // No matches were found
+ //
+ return NULL;
+}
+
+/**
+ Hook the operations in PlatformLangCodes, LangCodes, PlatformLang and Lang.
+
+ When setting Lang/LangCodes, simultaneously update PlatformLang/PlatformLangCodes.
+ According to UEFI spec, PlatformLangCodes/LangCodes are only set once in firmware initialization,
+ and are read-only. Therefore, in variable driver, only store the original value for other use.
+
+ @param[in] VariableName Name of variable.
+ @param[in] Data Variable data.
+ @param[in] DataSize Size of data. 0 means delete.
+ @param[in] VirtualMode Current calling mode for this function.
+ @param[in] Global Context of this Extended SAL Variable Services Class call.
+
+**/
+VOID
+AutoUpdateLangVariable(
+ IN CHAR16 *VariableName,
+ IN VOID *Data,
+ IN UINTN DataSize,
+ IN BOOLEAN VirtualMode,
+ IN ESAL_VARIABLE_GLOBAL *Global
+ )
+{
+ EFI_STATUS Status;
+ CHAR8 *BestPlatformLang;
+ CHAR8 *BestLang;
+ UINTN Index;
+ UINT32 Attributes;
+ VARIABLE_POINTER_TRACK Variable;
+ BOOLEAN SetLanguageCodes;
+ CHAR16 **PredefinedVariableName;
+ VARIABLE_GLOBAL *VariableGlobal;
+ UINT32 Instance;
+
+ //
+ // Don't do updates for delete operation
+ //
+ if (DataSize == 0) {
+ return;
+ }
+
+ SetLanguageCodes = FALSE;
+ VariableGlobal = &Global->VariableGlobal[VirtualMode];
+ Instance = Global->FvbInstance;
+
+
+ PredefinedVariableName = &Global->VariableName[VirtualMode][0];
+ if (StrCmp (VariableName, PredefinedVariableName[VAR_PLATFORM_LANG_CODES]) == 0) {
+ //
+ // PlatformLangCodes is a volatile variable, so it can not be updated at runtime.
+ //
+ if (EfiAtRuntime ()) {
+ return;
+ }
+
+ SetLanguageCodes = TRUE;
+
+ //
+ // According to UEFI spec, PlatformLangCodes is only set once in firmware initialization, and is read-only
+ // Therefore, in variable driver, only store the original value for other use.
+ //
+ if (Global->PlatformLangCodes[VirtualMode] != NULL) {
+ FreePool (Global->PlatformLangCodes[VirtualMode]);
+ }
+ Global->PlatformLangCodes[VirtualMode] = AllocateRuntimeCopyPool (DataSize, Data);
+ ASSERT (mVariableModuleGlobal->PlatformLangCodes[VirtualMode] != NULL);
+
+ //
+ // PlatformLang holds a single language from PlatformLangCodes,
+ // so the size of PlatformLangCodes is enough for the PlatformLang.
+ //
+ if (Global->PlatformLang[VirtualMode] != NULL) {
+ FreePool (Global->PlatformLang[VirtualMode]);
+ }
+ Global->PlatformLang[VirtualMode] = AllocateRuntimePool (DataSize);
+ ASSERT (Global->PlatformLang[VirtualMode] != NULL);
+
+ } else if (StrCmp (VariableName, PredefinedVariableName[VAR_LANG_CODES]) == 0) {
+ //
+ // LangCodes is a volatile variable, so it can not be updated at runtime.
+ //
+ if (EfiAtRuntime ()) {
+ return;
+ }
+
+ SetLanguageCodes = TRUE;
+
+ //
+ // According to UEFI spec, LangCodes is only set once in firmware initialization, and is read-only
+ // Therefore, in variable driver, only store the original value for other use.
+ //
+ if (Global->LangCodes[VirtualMode] != NULL) {
+ FreePool (Global->LangCodes[VirtualMode]);
+ }
+ Global->LangCodes[VirtualMode] = AllocateRuntimeCopyPool (DataSize, Data);
+ ASSERT (Global->LangCodes[VirtualMode] != NULL);
+ }
+
+ if (SetLanguageCodes
+ && (Global->PlatformLangCodes[VirtualMode] != NULL)
+ && (Global->LangCodes[VirtualMode] != NULL)) {
+ //
+ // Update Lang if PlatformLang is already set
+ // Update PlatformLang if Lang is already set
+ //
+ Status = FindVariable (PredefinedVariableName[VAR_PLATFORM_LANG], Global->GlobalVariableGuid[VirtualMode], &Variable, VariableGlobal, Instance);
+ if (!EFI_ERROR (Status)) {
+ //
+ // Update Lang
+ //
+ VariableName = PredefinedVariableName[VAR_PLATFORM_LANG];
+ } else {
+ Status = FindVariable (PredefinedVariableName[VAR_LANG], Global->GlobalVariableGuid[VirtualMode], &Variable, VariableGlobal, Instance);
+ if (!EFI_ERROR (Status)) {
+ //
+ // Update PlatformLang
+ //
+ VariableName = PredefinedVariableName[VAR_LANG];
+ } else {
+ //
+ // Neither PlatformLang nor Lang is set, directly return
+ //
+ return;
+ }
+ }
+ Data = (VOID *) GetEndPointer (VariableGlobal->VolatileVariableBase, TRUE, VariableGlobal, Instance);
+ GetVariableDataPtr ((EFI_PHYSICAL_ADDRESS) Variable.CurrPtr, Variable.Volatile, VariableGlobal, Instance, (CHAR16 *) Data);
+
+ Status = AccessVariableStore (
+ FALSE,
+ VariableGlobal,
+ Variable.Volatile,
+ Instance,
+ (UINTN) &(((VARIABLE_HEADER *)Variable.CurrPtr)->DataSize),
+ sizeof (DataSize),
+ &DataSize
+ );
+ ASSERT_EFI_ERROR (Status);
+ }
+
+ //
+ // According to UEFI spec, "Lang" and "PlatformLang" is NV|BS|RT attributions.
+ //
+ Attributes = EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS;
+
+ if (StrCmp (VariableName, PredefinedVariableName[VAR_PLATFORM_LANG]) == 0) {
+ //
+ // Update Lang when PlatformLangCodes/LangCodes were set.
+ //
+ if ((Global->PlatformLangCodes[VirtualMode] != NULL) && (Global->LangCodes[VirtualMode] != NULL)) {
+ //
+ // When setting PlatformLang, firstly get most matched language string from supported language codes.
+ //
+ BestPlatformLang = VariableGetBestLanguage (Global->PlatformLangCodes[VirtualMode], FALSE, VirtualMode, Data, NULL);
+ if (BestPlatformLang != NULL) {
+ //
+ // Get the corresponding index in language codes.
+ //
+ Index = GetIndexFromSupportedLangCodes (Global->PlatformLangCodes[VirtualMode], BestPlatformLang, FALSE);
+
+ //
+ // Get the corresponding ISO639 language tag according to RFC4646 language tag.
+ //
+ BestLang = GetLangFromSupportedLangCodes (Global->LangCodes[VirtualMode], Index, TRUE, VirtualMode, Global);
+
+ //
+ // Successfully convert PlatformLang to Lang, and set the BestLang value into Lang variable simultaneously.
+ //
+ FindVariable (PredefinedVariableName[VAR_LANG], Global->GlobalVariableGuid[VirtualMode], &Variable, VariableGlobal, Instance);
+
+ Status = UpdateVariable (
+ PredefinedVariableName[VAR_LANG],
+ Global->GlobalVariableGuid[VirtualMode],
+ BestLang,
+ ISO_639_2_ENTRY_SIZE + 1,
+ Attributes,
+ 0,
+ 0,
+ VirtualMode,
+ Global,
+ &Variable
+ );
+
+ DEBUG ((EFI_D_INFO, "Variable Driver Auto Update PlatformLang, PlatformLang:%a, Lang:%a\n", BestPlatformLang, BestLang));
+
+ ASSERT_EFI_ERROR (Status);
+ }
+ }
+
+ } else if (StrCmp (VariableName, PredefinedVariableName[VAR_LANG]) == 0) {
+ //
+ // Update PlatformLang when PlatformLangCodes/LangCodes were set.
+ //
+ if ((Global->PlatformLangCodes[VirtualMode] != NULL) && (Global->LangCodes[VirtualMode] != NULL)) {
+ //
+ // When setting Lang, firstly get most matched language string from supported language codes.
+ //
+ BestLang = VariableGetBestLanguage (Global->LangCodes[VirtualMode], TRUE, VirtualMode, Data, NULL);
+ if (BestLang != NULL) {
+ //
+ // Get the corresponding index in language codes.
+ //
+ Index = GetIndexFromSupportedLangCodes (Global->LangCodes[VirtualMode], BestLang, TRUE);
+
+ //
+ // Get the corresponding RFC4646 language tag according to ISO639 language tag.
+ //
+ BestPlatformLang = GetLangFromSupportedLangCodes (Global->PlatformLangCodes[VirtualMode], Index, FALSE, VirtualMode, Global);
+
+ //
+ // Successfully convert Lang to PlatformLang, and set the BestPlatformLang value into PlatformLang variable simultaneously.
+ //
+ FindVariable (PredefinedVariableName[VAR_PLATFORM_LANG], Global->GlobalVariableGuid[VirtualMode], &Variable, VariableGlobal, Instance);
+
+ Status = UpdateVariable (
+ PredefinedVariableName[VAR_PLATFORM_LANG],
+ Global->GlobalVariableGuid[VirtualMode],
+ BestPlatformLang,
+ AsciiStrSize (BestPlatformLang),
+ Attributes,
+ 0,
+ 0,
+ VirtualMode,
+ Global,
+ &Variable
+ );
+
+ DEBUG ((EFI_D_INFO, "Variable Driver Auto Update Lang, Lang:%a, PlatformLang:%a\n", BestLang, BestPlatformLang));
+ ASSERT_EFI_ERROR (Status);
+ }
+ }
+ }
+}
+
+/**
+ Update the variable region with Variable information. These are the same
+ arguments as the EFI Variable services.
+
+ @param[in] VariableName Name of variable.
+ @param[in] VendorGuid Guid of variable.
+ @param[in] Data Variable data.
+ @param[in] DataSize Size of data. 0 means delete.
+ @param[in] Attributes Attributes of the variable.
+ @param[in] KeyIndex Index of associated public key.
+ @param[in] MonotonicCount Value of associated monotonic count.
+ @param[in] VirtualMode Current calling mode for this function.
+ @param[in] Global Context of this Extended SAL Variable Services Class call.
+ @param[in] Variable The variable information which is used to keep track of variable usage.
+
+ @retval EFI_SUCCESS The update operation is success.
+ @retval EFI_OUT_OF_RESOURCES Variable region is full, can not write other data into this region.
+
+**/
+EFI_STATUS
+EFIAPI
+UpdateVariable (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN VOID *Data,
+ IN UINTN DataSize,
+ IN UINT32 Attributes OPTIONAL,
+ IN UINT32 KeyIndex OPTIONAL,
+ IN UINT64 MonotonicCount OPTIONAL,
+ IN BOOLEAN VirtualMode,
+ IN ESAL_VARIABLE_GLOBAL *Global,
+ IN VARIABLE_POINTER_TRACK *Variable
+ )
+{
+ EFI_STATUS Status;
+ VARIABLE_HEADER *NextVariable;
+ UINTN VarNameOffset;
+ UINTN VarDataOffset;
+ UINTN VarNameSize;
+ UINTN VarSize;
+ BOOLEAN Volatile;
+ UINT8 State;
+ VARIABLE_HEADER VariableHeader;
+ VARIABLE_HEADER *NextVariableHeader;
+ BOOLEAN Valid;
+ BOOLEAN Reclaimed;
+ VARIABLE_STORE_HEADER VariableStoreHeader;
+ UINTN ScratchSize;
+ VARIABLE_GLOBAL *VariableGlobal;
+ UINT32 Instance;
+
+ VariableGlobal = &Global->VariableGlobal[VirtualMode];
+ Instance = Global->FvbInstance;
+
+ Reclaimed = FALSE;
+
+ if (Variable->CurrPtr != 0) {
+
+ Valid = IsValidVariableHeader (Variable->CurrPtr, Variable->Volatile, VariableGlobal, Instance, &VariableHeader);
+ if (!Valid) {
+ Status = EFI_NOT_FOUND;
+ goto Done;
+ }
+
+ //
+ // Update/Delete existing variable
+ //
+ Volatile = Variable->Volatile;
+
+ if (EfiAtRuntime ()) {
+ //
+ // If EfiAtRuntime and the variable is Volatile and Runtime Access,
+ // the volatile is ReadOnly, and SetVariable should be aborted and
+ // return EFI_WRITE_PROTECTED.
+ //
+ if (Variable->Volatile) {
+ Status = EFI_WRITE_PROTECTED;
+ goto Done;
+ }
+ //
+ // Only variable have NV attribute can be updated/deleted in Runtime
+ //
+ if ((VariableHeader.Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ }
+ }
+ //
+ // Setting a data variable with no access, or zero DataSize attributes
+ // specified causes it to be deleted.
+ //
+ if (DataSize == 0 || (Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0) {
+ State = VariableHeader.State;
+ State &= VAR_DELETED;
+
+ Status = AccessVariableStore (
+ TRUE,
+ VariableGlobal,
+ Variable->Volatile,
+ Instance,
+ (UINTN) &(((VARIABLE_HEADER *)Variable->CurrPtr)->State),
+ sizeof (UINT8),
+ &State
+ );
+ if (!EFI_ERROR (Status)) {
+ UpdateVariableInfo (VariableName, VendorGuid, Volatile, FALSE, FALSE, TRUE, FALSE);
+ UpdateVariableCache (VariableName, VendorGuid, Attributes, DataSize, Data);
+ }
+ goto Done;
+ }
+ //
+ // Logic comes here to update variable.
+ // If the variable is marked valid and the same data has been passed in
+ // then return to the caller immediately.
+ //
+ if (DataSizeOfVariable (&VariableHeader) == DataSize) {
+ NextVariable = (VARIABLE_HEADER *)GetEndPointer (VariableGlobal->VolatileVariableBase, TRUE, VariableGlobal, Instance);
+ GetVariableDataPtr (Variable->CurrPtr, Variable->Volatile, VariableGlobal, Instance, (CHAR16 *) NextVariable);
+ if (CompareMem (Data, (VOID *) NextVariable, DataSize) == 0) {
+ UpdateVariableInfo (VariableName, VendorGuid, Volatile, FALSE, TRUE, FALSE, FALSE);
+ Status = EFI_SUCCESS;
+ goto Done;
+ }
+ }
+ if ((VariableHeader.State == VAR_ADDED) ||
+ (VariableHeader.State == (VAR_ADDED & VAR_IN_DELETED_TRANSITION))) {
+ //
+ // If new data is different from the old one, mark the old one as VAR_IN_DELETED_TRANSITION.
+ // It will be deleted if new variable is successfully written.
+ //
+ State = VariableHeader.State;
+ State &= VAR_IN_DELETED_TRANSITION;
+
+ Status = AccessVariableStore (
+ TRUE,
+ VariableGlobal,
+ Variable->Volatile,
+ Instance,
+ (UINTN) &(((VARIABLE_HEADER *)Variable->CurrPtr)->State),
+ sizeof (UINT8),
+ &State
+ );
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ }
+ } else {
+ //
+ // Create a new variable
+ //
+
+ //
+ // Make sure we are trying to create a new variable.
+ // Setting a data variable with no access, or zero DataSize attributes means to delete it.
+ //
+ if (DataSize == 0 || (Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0) {
+ Status = EFI_NOT_FOUND;
+ goto Done;
+ }
+
+ //
+ // Only variable have NV|RT attribute can be created in Runtime
+ //
+ if (EfiAtRuntime () &&
+ (((Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0) || ((Attributes & EFI_VARIABLE_NON_VOLATILE) == 0))) {
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ }
+ }
+
+ //
+ // Function part - create a new variable and copy the data.
+ // Both update a variable and create a variable will come here.
+ //
+ // Tricky part: Use scratch data area at the end of volatile variable store
+ // as a temporary storage.
+ //
+ NextVariable = (VARIABLE_HEADER *)GetEndPointer (VariableGlobal->VolatileVariableBase, TRUE, VariableGlobal, Instance);
+ ScratchSize = MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize));
+ NextVariableHeader = (VARIABLE_HEADER *) NextVariable;
+
+ SetMem (NextVariableHeader, ScratchSize, 0xff);
+
+ NextVariableHeader->StartId = VARIABLE_DATA;
+ NextVariableHeader->Attributes = Attributes;
+ NextVariableHeader->PubKeyIndex = KeyIndex;
+ NextVariableHeader->MonotonicCount = MonotonicCount;
+ NextVariableHeader->Reserved = 0;
+ VarNameOffset = sizeof (VARIABLE_HEADER);
+ VarNameSize = StrSize (VariableName);
+ CopyMem (
+ (UINT8 *) ((UINTN)NextVariable + VarNameOffset),
+ VariableName,
+ VarNameSize
+ );
+ VarDataOffset = VarNameOffset + VarNameSize + GET_PAD_SIZE (VarNameSize);
+ CopyMem (
+ (UINT8 *) ((UINTN)NextVariable + VarDataOffset),
+ Data,
+ DataSize
+ );
+ CopyMem (&NextVariableHeader->VendorGuid, VendorGuid, sizeof (EFI_GUID));
+ //
+ // There will be pad bytes after Data, the NextVariable->NameSize and
+ // NextVariable->DataSize should not include pad size so that variable
+ // service can get actual size in GetVariable.
+ //
+ NextVariableHeader->NameSize = (UINT32)VarNameSize;
+ NextVariableHeader->DataSize = (UINT32)DataSize;
+
+ //
+ // The actual size of the variable that stores in storage should
+ // include pad size.
+ //
+ VarSize = VarDataOffset + DataSize + GET_PAD_SIZE (DataSize);
+ if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
+ //
+ // Create a nonvolatile variable
+ //
+ Volatile = FALSE;
+
+ GetVarStoreHeader (VariableGlobal->NonVolatileVariableBase, FALSE, VariableGlobal, Instance, &VariableStoreHeader);
+ if ((((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0)
+ && ((HEADER_ALIGN (VarSize) + Global->HwErrVariableTotalSize) > PcdGet32(PcdHwErrStorageSize)))
+ || (((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == 0)
+ && ((HEADER_ALIGN (VarSize) + Global->CommonVariableTotalSize) > VariableStoreHeader.Size - sizeof (VARIABLE_STORE_HEADER) - PcdGet32(PcdHwErrStorageSize)))) {
+ if (EfiAtRuntime ()) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto Done;
+ }
+ //
+ // Perform garbage collection & reclaim operation
+ //
+ Status = Reclaim (VariableGlobal->NonVolatileVariableBase, &(Global->NonVolatileLastVariableOffset), FALSE, VirtualMode, Global, Variable->CurrPtr);
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ Reclaimed = TRUE;
+ //
+ // If still no enough space, return out of resources
+ //
+ if ((((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0)
+ && ((HEADER_ALIGN (VarSize) + Global->HwErrVariableTotalSize) > PcdGet32(PcdHwErrStorageSize)))
+ || (((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == 0)
+ && ((HEADER_ALIGN (VarSize) + Global->CommonVariableTotalSize) > VariableStoreHeader.Size - sizeof (VARIABLE_STORE_HEADER) - PcdGet32(PcdHwErrStorageSize)))) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto Done;
+ }
+ }
+ //
+ // Four steps
+ // 1. Write variable header
+ // 2. Set variable state to header valid
+ // 3. Write variable data
+ // 4. Set variable state to valid
+ //
+ //
+ // Step 1:
+ //
+ Status = AccessVariableStore (
+ TRUE,
+ VariableGlobal,
+ FALSE,
+ Instance,
+ VariableGlobal->NonVolatileVariableBase + Global->NonVolatileLastVariableOffset,
+ sizeof (VARIABLE_HEADER),
+ (UINT8 *) NextVariable
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ //
+ // Step 2:
+ //
+ NextVariableHeader->State = VAR_HEADER_VALID_ONLY;
+ Status = AccessVariableStore (
+ TRUE,
+ VariableGlobal,
+ FALSE,
+ Instance,
+ VariableGlobal->NonVolatileVariableBase + Global->NonVolatileLastVariableOffset,
+ sizeof (VARIABLE_HEADER),
+ (UINT8 *) NextVariable
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // Step 3:
+ //
+ Status = AccessVariableStore (
+ TRUE,
+ VariableGlobal,
+ FALSE,
+ Instance,
+ VariableGlobal->NonVolatileVariableBase + Global->NonVolatileLastVariableOffset + sizeof (VARIABLE_HEADER),
+ (UINT32) VarSize - sizeof (VARIABLE_HEADER),
+ (UINT8 *) NextVariable + sizeof (VARIABLE_HEADER)
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // Step 4:
+ //
+ NextVariableHeader->State = VAR_ADDED;
+ Status = AccessVariableStore (
+ TRUE,
+ VariableGlobal,
+ FALSE,
+ Instance,
+ VariableGlobal->NonVolatileVariableBase + Global->NonVolatileLastVariableOffset,
+ sizeof (VARIABLE_HEADER),
+ (UINT8 *) NextVariable
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ Global->NonVolatileLastVariableOffset += HEADER_ALIGN (VarSize);
+
+ if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0) {
+ Global->HwErrVariableTotalSize += HEADER_ALIGN (VarSize);
+ } else {
+ Global->CommonVariableTotalSize += HEADER_ALIGN (VarSize);
+ }
+ } else {
+ //
+ // Create a volatile variable
+ //
+ Volatile = TRUE;
+
+ if ((UINT32) (HEADER_ALIGN(VarSize) + Global->VolatileLastVariableOffset) >
+ ((VARIABLE_STORE_HEADER *) ((UINTN) (VariableGlobal->VolatileVariableBase)))->Size) {
+ //
+ // Perform garbage collection & reclaim operation
+ //
+ Status = Reclaim (VariableGlobal->VolatileVariableBase, &Global->VolatileLastVariableOffset, TRUE, VirtualMode, Global, Variable->CurrPtr);
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // If still no enough space, return out of resources
+ //
+ if ((UINT32) (HEADER_ALIGN (VarSize) + Global->VolatileLastVariableOffset) >
+ ((VARIABLE_STORE_HEADER *) ((UINTN) (VariableGlobal->VolatileVariableBase)))->Size
+ ) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto Done;
+ }
+ Reclaimed = TRUE;
+ }
+
+ NextVariableHeader->State = VAR_ADDED;
+ Status = AccessVariableStore (
+ TRUE,
+ VariableGlobal,
+ TRUE,
+ Instance,
+ VariableGlobal->VolatileVariableBase + Global->VolatileLastVariableOffset,
+ (UINT32) VarSize,
+ (UINT8 *) NextVariable
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ Global->VolatileLastVariableOffset += HEADER_ALIGN (VarSize);
+ }
+ //
+ // Mark the old variable as deleted
+ // If storage has just been reclaimed, the old variable marked as VAR_IN_DELETED_TRANSITION
+ // has already been eliminated, so no need to delete it.
+ //
+ if (!Reclaimed && !EFI_ERROR (Status) && Variable->CurrPtr != 0) {
+ State = ((VARIABLE_HEADER *)Variable->CurrPtr)->State;
+ State &= VAR_DELETED;
+
+ Status = AccessVariableStore (
+ TRUE,
+ VariableGlobal,
+ Variable->Volatile,
+ Instance,
+ (UINTN) &(((VARIABLE_HEADER *)Variable->CurrPtr)->State),
+ sizeof (UINT8),
+ &State
+ );
+ }
+
+ if (!EFI_ERROR (Status)) {
+ UpdateVariableInfo (VariableName, VendorGuid, Volatile, FALSE, TRUE, FALSE, FALSE);
+ UpdateVariableCache (VariableName, VendorGuid, Attributes, DataSize, Data);
+ }
+
+Done:
+ return Status;
+}
+
+/**
+ Implements EsalGetVariable function of Extended SAL Variable Services Class.
+
+ This function implements EsalGetVariable function of Extended SAL Variable Services Class.
+ It is equivalent in functionality to the EFI Runtime Service GetVariable().
+
+ @param[in] VariableName A Null-terminated Unicode string that is the name of
+ the vendor's variable.
+ @param[in] VendorGuid A unique identifier for the vendor.
+ @param[out] Attributes If not NULL, a pointer to the memory location to return the
+ attributes bitmask for the variable.
+ @param[in, out] DataSize Size of Data found. If size is less than the
+ data, this value contains the required size.
+ @param[out] Data On input, the size in bytes of the return Data buffer.
+ On output, the size of data returned in Data.
+ @param[in] VirtualMode Current calling mode for this function.
+ @param[in] Global Context of this Extended SAL Variable Services Class call.
+
+ @retval EFI_SUCCESS The function completed successfully.
+ @retval EFI_NOT_FOUND The variable was not found.
+ @retval EFI_BUFFER_TOO_SMALL DataSize is too small for the result. DataSize has
+ been updated with the size needed to complete the request.
+ @retval EFI_INVALID_PARAMETER VariableName is NULL.
+ @retval EFI_INVALID_PARAMETER VendorGuid is NULL.
+ @retval EFI_INVALID_PARAMETER DataSize is NULL.
+ @retval EFI_INVALID_PARAMETER DataSize is not too small and Data is NULL.
+ @retval EFI_DEVICE_ERROR The variable could not be retrieved due to a hardware error.
+ @retval EFI_SECURITY_VIOLATION The variable could not be retrieved due to an authentication failure.
+
+**/
+EFI_STATUS
+EFIAPI
+EsalGetVariable (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ OUT UINT32 *Attributes OPTIONAL,
+ IN OUT UINTN *DataSize,
+ OUT VOID *Data,
+ IN BOOLEAN VirtualMode,
+ IN ESAL_VARIABLE_GLOBAL *Global
+ )
+{
+ VARIABLE_POINTER_TRACK Variable;
+ UINTN VarDataSize;
+ EFI_STATUS Status;
+ VARIABLE_HEADER VariableHeader;
+ BOOLEAN Valid;
+ VARIABLE_GLOBAL *VariableGlobal;
+ UINT32 Instance;
+
+ if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ VariableGlobal = &Global->VariableGlobal[VirtualMode];
+ Instance = Global->FvbInstance;
+
+ AcquireLockOnlyAtBootTime(&VariableGlobal->VariableServicesLock);
+
+ //
+ // Check if this variable exists in cache.
+ //
+ Status = FindVariableInCache (VariableName, VendorGuid, Attributes, DataSize, Data);
+ if ((Status == EFI_BUFFER_TOO_SMALL) || (Status == EFI_SUCCESS)){
+ //
+ // If variable exists in cache, just update statistical information for it and finish.
+ // Here UpdateVariableInfo() has already retrieved data & attributes for output.
+ //
+ UpdateVariableInfo (VariableName, VendorGuid, FALSE, TRUE, FALSE, FALSE, TRUE);
+ goto Done;
+ }
+ //
+ // If variable does not exist in cache, search for it in variable storage area.
+ //
+ Status = FindVariable (VariableName, VendorGuid, &Variable, VariableGlobal, Instance);
+ if (Variable.CurrPtr == 0x0 || EFI_ERROR (Status)) {
+ //
+ // If it cannot be found in variable storage area, goto Done.
+ //
+ goto Done;
+ }
+
+ Valid = IsValidVariableHeader (Variable.CurrPtr, Variable.Volatile, VariableGlobal, Instance, &VariableHeader);
+ if (!Valid) {
+ Status = EFI_NOT_FOUND;
+ goto Done;
+ }
+ //
+ // If variable exists, but not in cache, get its data and attributes, update
+ // statistical information, and update cache.
+ //
+ VarDataSize = DataSizeOfVariable (&VariableHeader);
+ ASSERT (VarDataSize != 0);
+
+ if (*DataSize >= VarDataSize) {
+ if (Data == NULL) {
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ }
+
+ GetVariableDataPtr (
+ Variable.CurrPtr,
+ Variable.Volatile,
+ VariableGlobal,
+ Instance,
+ Data
+ );
+ if (Attributes != NULL) {
+ *Attributes = VariableHeader.Attributes;
+ }
+
+ *DataSize = VarDataSize;
+ UpdateVariableInfo (VariableName, VendorGuid, Variable.Volatile, TRUE, FALSE, FALSE, FALSE);
+ UpdateVariableCache (VariableName, VendorGuid, VariableHeader.Attributes, VarDataSize, Data);
+
+ Status = EFI_SUCCESS;
+ goto Done;
+ } else {
+ //
+ // If DataSize is too small for the result, return EFI_BUFFER_TOO_SMALL.
+ //
+ *DataSize = VarDataSize;
+ Status = EFI_BUFFER_TOO_SMALL;
+ goto Done;
+ }
+
+Done:
+ ReleaseLockOnlyAtBootTime (&VariableGlobal->VariableServicesLock);
+ return Status;
+}
+
+/**
+ Implements EsalGetNextVariableName function of Extended SAL Variable Services Class.
+
+ This function implements EsalGetNextVariableName function of Extended SAL Variable Services Class.
+ It is equivalent in functionality to the EFI Runtime Service GetNextVariableName().
+
+ @param[in, out] VariableNameSize Size of the variable
+ @param[in, out] VariableName On input, supplies the last VariableName that was returned by GetNextVariableName().
+ On output, returns the Null-terminated Unicode string of the current variable.
+ @param[in, out] VendorGuid On input, supplies the last VendorGuid that was returned by GetNextVariableName().
+ On output, returns the VendorGuid of the current variable.
+ @param[in] VirtualMode Current calling mode for this function.
+ @param[in] Global Context of this Extended SAL Variable Services Class call.
+
+ @retval EFI_SUCCESS The function completed successfully.
+ @retval EFI_NOT_FOUND The next variable was not found.
+ @retval EFI_BUFFER_TOO_SMALL VariableNameSize is too small for the result.
+ VariableNameSize has been updated with the size needed to complete the request.
+ @retval EFI_INVALID_PARAMETER VariableNameSize is NULL.
+ @retval EFI_INVALID_PARAMETER VariableName is NULL.
+ @retval EFI_INVALID_PARAMETER VendorGuid is NULL.
+ @retval EFI_DEVICE_ERROR The variable name could not be retrieved due to a hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+EsalGetNextVariableName (
+ IN OUT UINTN *VariableNameSize,
+ IN OUT CHAR16 *VariableName,
+ IN OUT EFI_GUID *VendorGuid,
+ IN BOOLEAN VirtualMode,
+ IN ESAL_VARIABLE_GLOBAL *Global
+ )
+{
+ VARIABLE_POINTER_TRACK Variable;
+ UINTN VarNameSize;
+ EFI_STATUS Status;
+ VARIABLE_HEADER VariableHeader;
+ VARIABLE_GLOBAL *VariableGlobal;
+ UINT32 Instance;
+
+ if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ VariableGlobal = &Global->VariableGlobal[VirtualMode];
+ Instance = Global->FvbInstance;
+
+ AcquireLockOnlyAtBootTime(&VariableGlobal->VariableServicesLock);
+
+ Status = FindVariable (VariableName, VendorGuid, &Variable, VariableGlobal, Instance);
+ //
+ // If the variable does not exist, goto Done and return.
+ //
+ if (Variable.CurrPtr == 0x0 || EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ if (VariableName[0] != 0) {
+ //
+ // If variable name is not NULL, get next variable
+ //
+ Variable.CurrPtr = GetNextVariablePtr (
+ Variable.CurrPtr,
+ Variable.Volatile,
+ VariableGlobal,
+ Instance
+ );
+ }
+
+ while (TRUE) {
+ if (Variable.CurrPtr >= Variable.EndPtr || Variable.CurrPtr == 0x0) {
+ //
+ // If fail to find a variable in current area, reverse the volatile attribute of area to search.
+ //
+ Variable.Volatile = (BOOLEAN) (Variable.Volatile ^ ((BOOLEAN) 0x1));
+ //
+ // Here we depend on the searching sequence of FindVariable().
+ // It first searches volatile area, then NV area.
+ // So if the volatile attribute after switching is non-volatile, it means that we have finished searching volatile area,
+ // and EFI_NOT_FOUND is returnd.
+ // Otherwise, it means that we have finished searchig non-volatile area, and we will continue to search volatile area.
+ //
+ if (!Variable.Volatile) {
+ Variable.StartPtr = GetStartPointer (VariableGlobal->NonVolatileVariableBase);
+ Variable.EndPtr = GetEndPointer (VariableGlobal->NonVolatileVariableBase, FALSE, VariableGlobal, Instance);
+ } else {
+ Status = EFI_NOT_FOUND;
+ goto Done;
+ }
+
+ Variable.CurrPtr = Variable.StartPtr;
+ if (!IsValidVariableHeader (Variable.CurrPtr, Variable.Volatile, VariableGlobal, Instance, NULL)) {
+ continue;
+ }
+ }
+ //
+ // Variable is found
+ //
+ if (IsValidVariableHeader (Variable.CurrPtr, Variable.Volatile, VariableGlobal, Instance, &VariableHeader)) {
+ if ((VariableHeader.State == VAR_ADDED) &&
+ (!(EfiAtRuntime () && ((VariableHeader.Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0)))) {
+ VarNameSize = NameSizeOfVariable (&VariableHeader);
+ ASSERT (VarNameSize != 0);
+
+ if (VarNameSize <= *VariableNameSize) {
+ GetVariableNamePtr (
+ Variable.CurrPtr,
+ Variable.Volatile,
+ VariableGlobal,
+ Instance,
+ VariableName
+ );
+ CopyMem (
+ VendorGuid,
+ &VariableHeader.VendorGuid,
+ sizeof (EFI_GUID)
+ );
+ Status = EFI_SUCCESS;
+ } else {
+ Status = EFI_BUFFER_TOO_SMALL;
+ }
+
+ *VariableNameSize = VarNameSize;
+ goto Done;
+ }
+ }
+
+ Variable.CurrPtr = GetNextVariablePtr (
+ Variable.CurrPtr,
+ Variable.Volatile,
+ VariableGlobal,
+ Instance
+ );
+ }
+
+Done:
+ ReleaseLockOnlyAtBootTime (&VariableGlobal->VariableServicesLock);
+ return Status;
+}
+
+/**
+ Implements EsalSetVariable function of Extended SAL Variable Services Class.
+
+ This function implements EsalSetVariable function of Extended SAL Variable Services Class.
+ It is equivalent in functionality to the EFI Runtime Service SetVariable().
+
+ @param[in] VariableName A Null-terminated Unicode string that is the name of the vendor's
+ variable. Each VariableName is unique for each
+ VendorGuid. VariableName must contain 1 or more
+ Unicode characters. If VariableName is an empty Unicode
+ string, then EFI_INVALID_PARAMETER is returned.
+ @param[in] VendorGuid A unique identifier for the vendor.
+ @param[in] Attributes Attributes bitmask to set for the variable.
+ @param[in] DataSize The size in bytes of the Data buffer. A size of zero causes the
+ variable to be deleted.
+ @param[in] Data The contents for the variable.
+ @param[in] VirtualMode Current calling mode for this function.
+ @param[in] Global Context of this Extended SAL Variable Services Class call.
+
+ @retval EFI_SUCCESS The firmware has successfully stored the variable and its data as
+ defined by the Attributes.
+ @retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied, or the
+ DataSize exceeds the maximum allowed.
+ @retval EFI_INVALID_PARAMETER VariableName is an empty Unicode string.
+ @retval EFI_OUT_OF_RESOURCES Not enough storage is available to hold the variable and its data.
+ @retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.
+ @retval EFI_WRITE_PROTECTED The variable in question is read-only.
+ @retval EFI_WRITE_PROTECTED The variable in question cannot be deleted.
+ @retval EFI_SECURITY_VIOLATION The variable could not be retrieved due to an authentication failure.
+ @retval EFI_NOT_FOUND The variable trying to be updated or deleted was not found.
+
+**/
+EFI_STATUS
+EFIAPI
+EsalSetVariable (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN UINT32 Attributes,
+ IN UINTN DataSize,
+ IN VOID *Data,
+ IN BOOLEAN VirtualMode,
+ IN ESAL_VARIABLE_GLOBAL *Global
+ )
+{
+ VARIABLE_POINTER_TRACK Variable;
+ EFI_STATUS Status;
+ EFI_PHYSICAL_ADDRESS NextVariable;
+ EFI_PHYSICAL_ADDRESS Point;
+ VARIABLE_GLOBAL *VariableGlobal;
+ UINT32 Instance;
+ UINT32 KeyIndex;
+ UINT64 MonotonicCount;
+ UINTN PayloadSize;
+
+ //
+ // Check input parameters
+ //
+ if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if (DataSize != 0 && Data == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ //
+ // EFI_VARIABLE_RUNTIME_ACCESS bit cannot be set without EFI_VARIABLE_BOOTSERVICE_ACCESS bit.
+ //
+ if ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == EFI_VARIABLE_RUNTIME_ACCESS) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) == EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) {
+ if (DataSize < AUTHINFO_SIZE) {
+ //
+ // Try to write Authencated Variable without AuthInfo
+ //
+ return EFI_SECURITY_VIOLATION;
+ }
+ PayloadSize = DataSize - AUTHINFO_SIZE;
+ } else {
+ PayloadSize = DataSize;
+ }
+
+ VariableGlobal = &Global->VariableGlobal[VirtualMode];
+ Instance = Global->FvbInstance;
+
+ if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
+ //
+ // For variable for hardware error record, the size of the VariableName, including the Unicode Null
+ // in bytes plus the DataSize is limited to maximum size of PcdGet32(PcdMaxHardwareErrorVariableSize) bytes.
+ //
+ if ((PayloadSize > PcdGet32(PcdMaxHardwareErrorVariableSize)) ||
+ (sizeof (VARIABLE_HEADER) + StrSize (VariableName) + PayloadSize > PcdGet32(PcdMaxHardwareErrorVariableSize))) {
+ return EFI_INVALID_PARAMETER;
+ }
+ //
+ // According to UEFI spec, HARDWARE_ERROR_RECORD variable name convention should be L"HwErrRecXXXX"
+ //
+ if (StrnCmp (VariableName, \
+ Global->VariableName[VirtualMode][VAR_HW_ERR_REC], \
+ StrLen(Global->VariableName[VirtualMode][VAR_HW_ERR_REC])) != 0) {
+ return EFI_INVALID_PARAMETER;
+ }
+ } else {
+ //
+ // For variable not for hardware error record, the size of the VariableName, including the
+ // Unicode Null in bytes plus the DataSize is limited to maximum size of PcdGet32(PcdMaxVariableSize) bytes.
+ //
+ if ((PayloadSize > PcdGet32(PcdMaxVariableSize)) ||
+ (sizeof (VARIABLE_HEADER) + StrSize (VariableName) + PayloadSize > PcdGet32(PcdMaxVariableSize))) {
+ return EFI_INVALID_PARAMETER;
+ }
+ }
+
+ AcquireLockOnlyAtBootTime(&VariableGlobal->VariableServicesLock);
+
+ //
+ // Consider reentrant in MCA/INIT/NMI. It needs be reupdated;
+ //
+ if (InterlockedIncrement (&Global->ReentrantState) > 1) {
+ Point = VariableGlobal->NonVolatileVariableBase;;
+ //
+ // Parse non-volatile variable data and get last variable offset
+ //
+ NextVariable = GetStartPointer (Point);
+ while (IsValidVariableHeader (NextVariable, FALSE, VariableGlobal, Instance, NULL)) {
+ NextVariable = GetNextVariablePtr (NextVariable, FALSE, VariableGlobal, Instance);
+ }
+ Global->NonVolatileLastVariableOffset = NextVariable - Point;
+ }
+
+ //
+ // Check whether the input variable exists
+ //
+
+ Status = FindVariable (VariableName, VendorGuid, &Variable, VariableGlobal, Instance);
+
+ //
+ // Hook the operation of setting PlatformLangCodes/PlatformLang and LangCodes/Lang
+ //
+ AutoUpdateLangVariable (VariableName, Data, PayloadSize, VirtualMode, Global);
+
+ //
+ // Process PK, KEK, Sigdb seperately
+ //
+ if (CompareGuid (VendorGuid, Global->GlobalVariableGuid[VirtualMode]) && (StrCmp (VariableName, Global->VariableName[VirtualMode][VAR_PLATFORM_KEY]) == 0)) {
+ Status = ProcessVarWithPk (VariableName, VendorGuid, Data, DataSize, VirtualMode, Global, &Variable, Attributes, TRUE);
+ } else if (CompareGuid (VendorGuid, Global->GlobalVariableGuid[VirtualMode]) && (StrCmp (VariableName, Global->VariableName[VirtualMode][VAR_KEY_EXCHANGE_KEY]) == 0)) {
+ Status = ProcessVarWithPk (VariableName, VendorGuid, Data, DataSize, VirtualMode, Global, &Variable, Attributes, FALSE);
+ } else if (CompareGuid (VendorGuid, Global->ImageSecurityDatabaseGuid[VirtualMode])) {
+ Status = ProcessVarWithKek (VariableName, VendorGuid, Data, DataSize, VirtualMode, Global, &Variable, Attributes);
+ } else {
+ Status = VerifyVariable (Data, DataSize, VirtualMode, Global, &Variable, Attributes, &KeyIndex, &MonotonicCount);
+ if (!EFI_ERROR(Status)) {
+ //
+ // Verification pass
+ //
+ if ((Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) != 0) {
+ //
+ // Cut the certificate size before set
+ //
+ Status = UpdateVariable (
+ VariableName,
+ VendorGuid,
+ (UINT8*)Data + AUTHINFO_SIZE,
+ DataSize - AUTHINFO_SIZE,
+ Attributes,
+ KeyIndex,
+ MonotonicCount,
+ VirtualMode,
+ Global,
+ &Variable
+ );
+ } else {
+ //
+ // Update variable as usual
+ //
+ Status = UpdateVariable (
+ VariableName,
+ VendorGuid,
+ Data,
+ DataSize,
+ Attributes,
+ 0,
+ 0,
+ VirtualMode,
+ Global,
+ &Variable
+ );
+ }
+ }
+ }
+
+ InterlockedDecrement (&Global->ReentrantState);
+ ReleaseLockOnlyAtBootTime (&VariableGlobal->VariableServicesLock);
+ return Status;
+}
+
+/**
+ Implements EsalQueryVariableInfo function of Extended SAL Variable Services Class.
+
+ This function implements EsalQueryVariableInfo function of Extended SAL Variable Services Class.
+ It is equivalent in functionality to the EFI Runtime Service QueryVariableInfo().
+
+ @param[in] Attributes Attributes bitmask to specify the type of variables
+ on which to return information.
+ @param[out] MaximumVariableStorageSize On output the maximum size of the storage space available for
+ the EFI variables associated with the attributes specified.
+ @param[out] RemainingVariableStorageSize Returns the remaining size of the storage space available for EFI
+ variables associated with the attributes specified.
+ @param[out] MaximumVariableSize Returns the maximum size of an individual EFI variable
+ associated with the attributes specified.
+ @param[in] VirtualMode Current calling mode for this function
+ @param[in] Global Context of this Extended SAL Variable Services Class call
+
+ @retval EFI_SUCCESS Valid answer returned.
+ @retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied.
+ @retval EFI_UNSUPPORTED The attribute is not supported on this platform, and the
+ MaximumVariableStorageSize, RemainingVariableStorageSize,
+ MaximumVariableSize are undefined.
+**/
+EFI_STATUS
+EFIAPI
+EsalQueryVariableInfo (
+ IN UINT32 Attributes,
+ OUT UINT64 *MaximumVariableStorageSize,
+ OUT UINT64 *RemainingVariableStorageSize,
+ OUT UINT64 *MaximumVariableSize,
+ IN BOOLEAN VirtualMode,
+ IN ESAL_VARIABLE_GLOBAL *Global
+ )
+{
+ EFI_PHYSICAL_ADDRESS Variable;
+ EFI_PHYSICAL_ADDRESS NextVariable;
+ UINT64 VariableSize;
+ EFI_PHYSICAL_ADDRESS VariableStoreHeaderAddress;
+ BOOLEAN Volatile;
+ VARIABLE_STORE_HEADER VarStoreHeader;
+ VARIABLE_HEADER VariableHeader;
+ UINT64 CommonVariableTotalSize;
+ UINT64 HwErrVariableTotalSize;
+ VARIABLE_GLOBAL *VariableGlobal;
+ UINT32 Instance;
+
+ CommonVariableTotalSize = 0;
+ HwErrVariableTotalSize = 0;
+
+ if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == 0) {
+ //
+ // Make sure the Attributes combination is supported by the platform.
+ //
+ return EFI_UNSUPPORTED;
+ } else if ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == EFI_VARIABLE_RUNTIME_ACCESS) {
+ //
+ // Make sure if runtime bit is set, boot service bit is set also.
+ //
+ return EFI_INVALID_PARAMETER;
+ } else if (EfiAtRuntime () && ((Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0)) {
+ //
+ // Make sure RT Attribute is set if we are in Runtime phase.
+ //
+ return EFI_INVALID_PARAMETER;
+ } else if ((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
+ //
+ // Make sure Hw Attribute is set with NV.
+ //
+ return EFI_INVALID_PARAMETER;
+ }
+
+ VariableGlobal = &Global->VariableGlobal[VirtualMode];
+ Instance = Global->FvbInstance;
+
+ AcquireLockOnlyAtBootTime(&VariableGlobal->VariableServicesLock);
+
+ if((Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
+ //
+ // Query is Volatile related.
+ //
+ Volatile = TRUE;
+ VariableStoreHeaderAddress = VariableGlobal->VolatileVariableBase;
+ } else {
+ //
+ // Query is Non-Volatile related.
+ //
+ Volatile = FALSE;
+ VariableStoreHeaderAddress = VariableGlobal->NonVolatileVariableBase;
+ }
+
+ //
+ // Now let's fill *MaximumVariableStorageSize *RemainingVariableStorageSize
+ // with the storage size (excluding the storage header size).
+ //
+ GetVarStoreHeader (VariableStoreHeaderAddress, Volatile, VariableGlobal, Instance, &VarStoreHeader);
+
+ *MaximumVariableStorageSize = VarStoreHeader.Size - sizeof (VARIABLE_STORE_HEADER);
+
+ // Harware error record variable needs larger size.
+ //
+ if ((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
+ *MaximumVariableStorageSize = PcdGet32(PcdHwErrStorageSize);
+ *MaximumVariableSize = PcdGet32(PcdMaxHardwareErrorVariableSize) - sizeof (VARIABLE_HEADER);
+ } else {
+ if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
+ ASSERT (PcdGet32(PcdHwErrStorageSize) < VarStoreHeader.Size);
+ *MaximumVariableStorageSize = VarStoreHeader.Size - sizeof (VARIABLE_STORE_HEADER) - PcdGet32(PcdHwErrStorageSize);
+ }
+
+ //
+ // Let *MaximumVariableSize be PcdGet32(PcdMaxVariableSize) with the exception of the variable header size.
+ //
+ *MaximumVariableSize = PcdGet32(PcdMaxVariableSize) - sizeof (VARIABLE_HEADER);
+ }
+
+ //
+ // Point to the starting address of the variables.
+ //
+ Variable = GetStartPointer (VariableStoreHeaderAddress);
+
+ //
+ // Now walk through the related variable store.
+ //
+ while (IsValidVariableHeader (Variable, Volatile, VariableGlobal, Instance, &VariableHeader) &&
+ (Variable < GetEndPointer (VariableStoreHeaderAddress, Volatile, VariableGlobal, Instance))) {
+ NextVariable = GetNextVariablePtr (Variable, Volatile, VariableGlobal, Instance);
+ VariableSize = NextVariable - Variable;
+
+ if (EfiAtRuntime ()) {
+ //
+ // we don't take the state of the variables in mind
+ // when calculating RemainingVariableStorageSize,
+ // since the space occupied by variables not marked with
+ // VAR_ADDED is not allowed to be reclaimed in Runtime.
+ //
+ if ((VariableHeader.Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
+ HwErrVariableTotalSize += VariableSize;
+ } else {
+ CommonVariableTotalSize += VariableSize;
+ }
+ } else {
+ //
+ // Only care about Variables with State VAR_ADDED,because
+ // the space not marked as VAR_ADDED is reclaimable now.
+ //
+ if (VariableHeader.State == VAR_ADDED) {
+ if ((VariableHeader.Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
+ HwErrVariableTotalSize += VariableSize;
+ } else {
+ CommonVariableTotalSize += VariableSize;
+ }
+ }
+ }
+
+ //
+ // Go to the next one
+ //
+ Variable = NextVariable;
+ }
+
+ if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD){
+ *RemainingVariableStorageSize = *MaximumVariableStorageSize - HwErrVariableTotalSize;
+ }else {
+ *RemainingVariableStorageSize = *MaximumVariableStorageSize - CommonVariableTotalSize;
+ }
+
+ if (*RemainingVariableStorageSize < sizeof (VARIABLE_HEADER)) {
+ *MaximumVariableSize = 0;
+ } else if ((*RemainingVariableStorageSize - sizeof (VARIABLE_HEADER)) < *MaximumVariableSize) {
+ *MaximumVariableSize = *RemainingVariableStorageSize - sizeof (VARIABLE_HEADER);
+ }
+
+ ReleaseLockOnlyAtBootTime (&VariableGlobal->VariableServicesLock);
+ return EFI_SUCCESS;
+}
+
+/**
+ Notification function of EVT_GROUP_READY_TO_BOOT event group.
+
+ This is a notification function registered on EVT_GROUP_READY_TO_BOOT event group.
+ When the Boot Manager is about to load and execute a boot option, it reclaims variable
+ storage if free size is below the threshold.
+
+ @param[in] Event Event whose notification function is being invoked.
+ @param[in] Context Pointer to the notification function's context.
+
+**/
+VOID
+EFIAPI
+ReclaimForOS(
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ UINT32 VarSize;
+ EFI_STATUS Status;
+ UINTN CommonVariableSpace;
+ UINTN RemainingCommonVariableSpace;
+ UINTN RemainingHwErrVariableSpace;
+
+ VarSize = ((VARIABLE_STORE_HEADER *) ((UINTN) mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase))->Size;
+ Status = EFI_SUCCESS;
+ //
+ //Allowable max size of common variable storage space
+ //
+ CommonVariableSpace = VarSize - sizeof (VARIABLE_STORE_HEADER) - PcdGet32(PcdHwErrStorageSize);
+
+ RemainingCommonVariableSpace = CommonVariableSpace - mVariableModuleGlobal->CommonVariableTotalSize;
+
+ RemainingHwErrVariableSpace = PcdGet32 (PcdHwErrStorageSize) - mVariableModuleGlobal->HwErrVariableTotalSize;
+ //
+ // If the free area is below a threshold, then performs reclaim operation.
+ //
+ if ((RemainingCommonVariableSpace < PcdGet32 (PcdMaxVariableSize))
+ || ((PcdGet32 (PcdHwErrStorageSize) != 0) &&
+ (RemainingHwErrVariableSpace < PcdGet32 (PcdMaxHardwareErrorVariableSize)))){
+ Status = Reclaim (
+ mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase,
+ &mVariableModuleGlobal->NonVolatileLastVariableOffset,
+ FALSE,
+ Physical,
+ mVariableModuleGlobal,
+ 0x0
+ );
+ ASSERT_EFI_ERROR (Status);
+ }
+}
+
+/**
+ Initializes variable store area for non-volatile and volatile variable.
+
+ This function allocates and initializes memory space for global context of ESAL
+ variable service and variable store area for non-volatile and volatile variable.
+
+ @param[in] ImageHandle The Image handle of this driver.
+ @param[in] SystemTable The pointer of EFI_SYSTEM_TABLE.
+
+ @retval EFI_SUCCESS Function successfully executed.
+ @retval EFI_OUT_OF_RESOURCES Fail to allocate enough memory resource.
+
+**/
+EFI_STATUS
+VariableCommonInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+ EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
+ EFI_PHYSICAL_ADDRESS CurrPtr;
+ VARIABLE_STORE_HEADER *VolatileVariableStore;
+ VARIABLE_STORE_HEADER *VariableStoreHeader;
+ EFI_PHYSICAL_ADDRESS Variable;
+ EFI_PHYSICAL_ADDRESS NextVariable;
+ UINTN VariableSize;
+ UINT32 Instance;
+ EFI_PHYSICAL_ADDRESS FvVolHdr;
+ EFI_PHYSICAL_ADDRESS TempVariableStoreHeader;
+ EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;
+ UINT64 BaseAddress;
+ UINT64 Length;
+ UINTN Index;
+ UINT8 Data;
+ EFI_PHYSICAL_ADDRESS VariableStoreBase;
+ UINT64 VariableStoreLength;
+ EFI_EVENT ReadyToBootEvent;
+ UINTN ScratchSize;
+
+ //
+ // Allocate memory for mVariableModuleGlobal
+ //
+ mVariableModuleGlobal = AllocateRuntimeZeroPool (sizeof (ESAL_VARIABLE_GLOBAL));
+ if (mVariableModuleGlobal == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ mVariableModuleGlobal->GlobalVariableGuid[Physical] = &gEfiGlobalVariableGuid;
+ CopyMem (
+ mVariableModuleGlobal->VariableName[Physical],
+ mVariableName,
+ sizeof (mVariableName)
+ );
+
+ EfiInitializeLock(&mVariableModuleGlobal->VariableGlobal[Physical].VariableServicesLock, TPL_NOTIFY);
+
+ //
+ // Note that in EdkII variable driver implementation, Hardware Error Record type variable
+ // is stored with common variable in the same NV region. So the platform integrator should
+ // ensure that the value of PcdHwErrStorageSize is less than or equal to the value of
+ // PcdFlashNvStorageVariableSize.
+ //
+ ASSERT (PcdGet32(PcdHwErrStorageSize) <= PcdGet32 (PcdFlashNvStorageVariableSize));
+
+ //
+ // Allocate memory for volatile variable store
+ //
+ ScratchSize = MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxHardwareErrorVariableSize));
+ VolatileVariableStore = AllocateRuntimePool (PcdGet32 (PcdVariableStoreSize) + ScratchSize);
+ if (VolatileVariableStore == NULL) {
+ FreePool (mVariableModuleGlobal);
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ SetMem (VolatileVariableStore, PcdGet32 (PcdVariableStoreSize) + ScratchSize, 0xff);
+
+ //
+ // Variable Specific Data
+ //
+ mVariableModuleGlobal->VariableGlobal[Physical].VolatileVariableBase = (EFI_PHYSICAL_ADDRESS) (UINTN) VolatileVariableStore;
+ mVariableModuleGlobal->VolatileLastVariableOffset = (UINTN) GetStartPointer ((EFI_PHYSICAL_ADDRESS) VolatileVariableStore) - (UINTN) VolatileVariableStore;
+
+ CopyGuid (&VolatileVariableStore->Signature, &gEfiAuthenticatedVariableGuid);
+ VolatileVariableStore->Size = PcdGet32 (PcdVariableStoreSize);
+ VolatileVariableStore->Format = VARIABLE_STORE_FORMATTED;
+ VolatileVariableStore->State = VARIABLE_STORE_HEALTHY;
+ VolatileVariableStore->Reserved = 0;
+ VolatileVariableStore->Reserved1 = 0;
+
+ //
+ // Get non volatile varaible store
+ //
+ TempVariableStoreHeader = (UINT64) PcdGet32 (PcdFlashNvStorageVariableBase);
+ VariableStoreBase = TempVariableStoreHeader + \
+ (((EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) (TempVariableStoreHeader)) -> HeaderLength);
+ VariableStoreLength = (UINT64) PcdGet32 (PcdFlashNvStorageVariableSize) - \
+ (((EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) (TempVariableStoreHeader)) -> HeaderLength);
+ //
+ // Mark the variable storage region of the FLASH as RUNTIME
+ //
+ BaseAddress = VariableStoreBase & (~EFI_PAGE_MASK);
+ Length = VariableStoreLength + (VariableStoreBase - BaseAddress);
+ Length = (Length + EFI_PAGE_SIZE - 1) & (~EFI_PAGE_MASK);
+
+ Status = gDS->GetMemorySpaceDescriptor (BaseAddress, &GcdDescriptor);
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ Status = gDS->SetMemorySpaceAttributes (
+ BaseAddress,
+ Length,
+ GcdDescriptor.Attributes | EFI_MEMORY_RUNTIME
+ );
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // Get address of non volatile variable store base.
+ //
+ mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase = VariableStoreBase;
+
+ //
+ // Check Integrity
+ //
+ //
+ // Find the Correct Instance of the FV Block Service.
+ //
+ Instance = 0;
+ CurrPtr = mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase;
+
+ do {
+ FvVolHdr = 0;
+ Status = (EFI_STATUS) EsalCall (
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_LO,
+ EFI_EXTENDED_SAL_FV_BLOCK_SERVICES_PROTOCOL_GUID_HI,
+ GetPhysicalAddressFunctionId,
+ Instance,
+ (UINT64) &FvVolHdr,
+ 0,
+ 0,
+ 0,
+ 0,
+ 0
+ ).Status;
+ if (EFI_ERROR (Status)) {
+ break;
+ }
+ FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) FvVolHdr);
+ ASSERT (FwVolHeader != NULL);
+ if (CurrPtr >= (EFI_PHYSICAL_ADDRESS) FwVolHeader &&
+ CurrPtr < ((EFI_PHYSICAL_ADDRESS) FwVolHeader + FwVolHeader->FvLength)) {
+ mVariableModuleGlobal->FvbInstance = Instance;
+ break;
+ }
+
+ Instance++;
+ } while (Status == EFI_SUCCESS);
+
+ VariableStoreHeader = (VARIABLE_STORE_HEADER *) CurrPtr;
+ if (GetVariableStoreStatus (VariableStoreHeader) == EfiValid) {
+ if (~VariableStoreHeader->Size == 0) {
+ Status = AccessVariableStore (
+ TRUE,
+ &mVariableModuleGlobal->VariableGlobal[Physical],
+ FALSE,
+ mVariableModuleGlobal->FvbInstance,
+ (UINTN) &VariableStoreHeader->Size,
+ sizeof (UINT32),
+ (UINT8 *) &VariableStoreLength
+ );
+ //
+ // As Variables are stored in NV storage, which are slow devices,such as flash.
+ // Variable operation may skip checking variable program result to improve performance,
+ // We can assume Variable program is OK through some check point.
+ // Variable Store Size Setting should be the first Variable write operation,
+ // We can assume all Read/Write is OK if we can set Variable store size successfully.
+ // If write fail, we will assert here.
+ //
+ ASSERT(VariableStoreHeader->Size == VariableStoreLength);
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ }
+
+ mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase = (EFI_PHYSICAL_ADDRESS) ((UINTN) CurrPtr);
+ //
+ // Parse non-volatile variable data and get last variable offset.
+ //
+ Variable = GetStartPointer (CurrPtr);
+ Status = EFI_SUCCESS;
+
+ while (IsValidVariableHeader (Variable, FALSE, &(mVariableModuleGlobal->VariableGlobal[Physical]), Instance, NULL)) {
+ NextVariable = GetNextVariablePtr (
+ Variable,
+ FALSE,
+ &(mVariableModuleGlobal->VariableGlobal[Physical]),
+ Instance
+ );
+ VariableSize = NextVariable - Variable;
+ if ((((VARIABLE_HEADER *)Variable)->Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
+ mVariableModuleGlobal->HwErrVariableTotalSize += VariableSize;
+ } else {
+ mVariableModuleGlobal->CommonVariableTotalSize += VariableSize;
+ }
+
+ Variable = NextVariable;
+ }
+
+ mVariableModuleGlobal->NonVolatileLastVariableOffset = (UINTN) Variable - (UINTN) CurrPtr;
+
+ //
+ // Check if the free area is really free.
+ //
+ for (Index = mVariableModuleGlobal->NonVolatileLastVariableOffset; Index < VariableStoreHeader->Size; Index++) {
+ Data = ((UINT8 *) (UINTN) mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase)[Index];
+ if (Data != 0xff) {
+ //
+ // There must be something wrong in variable store, do reclaim operation.
+ //
+ Status = Reclaim (
+ mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase,
+ &mVariableModuleGlobal->NonVolatileLastVariableOffset,
+ FALSE,
+ Physical,
+ mVariableModuleGlobal,
+ 0x0
+ );
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ break;
+ }
+ }
+
+ //
+ // Register the event handling function to reclaim variable for OS usage.
+ //
+ Status = EfiCreateEventReadyToBootEx (
+ TPL_NOTIFY,
+ ReclaimForOS,
+ NULL,
+ &ReadyToBootEvent
+ );
+ } else {
+ Status = EFI_VOLUME_CORRUPTED;
+ DEBUG((EFI_D_INFO, "Variable Store header is corrupted\n"));
+ }
+
+Done:
+ if (EFI_ERROR (Status)) {
+ FreePool (mVariableModuleGlobal);
+ FreePool (VolatileVariableStore);
+ }
+
+ return Status;
+}
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