diff options
| author | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2007-06-28 11:29:10 +0000 |
|---|---|---|
| committer | vanjeff <vanjeff@6f19259b-4bc3-4df7-8a09-765794883524> | 2007-06-28 11:29:10 +0000 |
| commit | 94774441154ca4e11ab028490c66f1ef6105d267 (patch) | |
| tree | fc534dadb9c3a8418a9810f03972a1d6c59b1f48 /MdeModulePkg/Universal/VariableRuntimeDxe/Variable.c | |
| parent | 1e95872165fec3526c0b7d0d323997927d484404 (diff) | |
| download | edk2-94774441154ca4e11ab028490c66f1ef6105d267.zip edk2-94774441154ca4e11ab028490c66f1ef6105d267.tar.gz edk2-94774441154ca4e11ab028490c66f1ef6105d267.tar.bz2 | |
add English.inf, EdkFvbServiceLib.inf and Variable.inf
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2842 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg/Universal/VariableRuntimeDxe/Variable.c')
| -rw-r--r-- | MdeModulePkg/Universal/VariableRuntimeDxe/Variable.c | 1479 |
1 files changed, 1479 insertions, 0 deletions
diff --git a/MdeModulePkg/Universal/VariableRuntimeDxe/Variable.c b/MdeModulePkg/Universal/VariableRuntimeDxe/Variable.c new file mode 100644 index 0000000..f6aa468 --- /dev/null +++ b/MdeModulePkg/Universal/VariableRuntimeDxe/Variable.c @@ -0,0 +1,1479 @@ +/*++
+
+Copyright (c) 2006 - 2007, Intel Corporation
+All rights reserved. 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.
+
+Module Name:
+
+ Variable.c
+
+Abstract:
+
+Revision History
+
+--*/
+
+
+#include "Variable.h"
+#include "reclaim.h"
+
+#include <Common/FlashMap.h>
+
+//
+// Don't use module globals after the SetVirtualAddress map is signaled
+//
+ESAL_VARIABLE_GLOBAL *mVariableModuleGlobal;
+
+//
+// This is a temperary function which will be removed
+// when EfiAcquireLock in UefiLib can handle the
+// the call in UEFI Runtimer driver in RT phase.
+//
+STATIC
+VOID
+AcquireLockOnlyAtBootTime (
+ IN EFI_LOCK *Lock
+ )
+{
+ if (!EfiAtRuntime ()) {
+ EfiAcquireLock (Lock);
+ }
+}
+
+//
+// This is a temperary function which will be removed
+// when EfiAcquireLock in UefiLib can handle the
+// the call in UEFI Runtimer driver in RT phase.
+//
+STATIC
+VOID
+ReleaseLockOnlyAtBootTime (
+ IN EFI_LOCK *Lock
+ )
+{
+ if (!EfiAtRuntime ()) {
+ EfiReleaseLock (Lock);
+ }
+}
+
+STATIC
+BOOLEAN
+EFIAPI
+IsValidVariableHeader (
+ IN VARIABLE_HEADER *Variable
+ )
+/*++
+
+Routine Description:
+
+ This code checks if variable header is valid or not.
+
+Arguments:
+ Variable Pointer to the Variable Header.
+
+Returns:
+ TRUE Variable header is valid.
+ FALSE Variable header is not valid.
+
+--*/
+{
+ if (Variable == NULL ||
+ Variable->StartId != VARIABLE_DATA ||
+ (sizeof (VARIABLE_HEADER) + Variable->NameSize + Variable->DataSize) > MAX_VARIABLE_SIZE
+ ) {
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+STATIC
+EFI_STATUS
+EFIAPI
+UpdateVariableStore (
+ IN VARIABLE_GLOBAL *Global,
+ IN BOOLEAN Volatile,
+ IN BOOLEAN SetByIndex,
+ IN UINTN Instance,
+ IN UINTN DataPtrIndex,
+ IN UINT32 DataSize,
+ IN UINT8 *Buffer
+ )
+/*++
+
+Routine Description:
+
+ This function writes data to the FWH at the correct LBA even if the LBAs
+ are fragmented.
+
+Arguments:
+
+ Global Pointer to VARAIBLE_GLOBAL structure
+ Volatile If the Variable is Volatile or Non-Volatile
+ SetByIndex TRUE: Target pointer is given as index
+ FALSE: Target pointer is absolute
+ Instance Instance of FV Block services
+ DataPtrIndex Pointer to the Data from the end of VARIABLE_STORE_HEADER
+ structure
+ DataSize Size of data to be written.
+ Buffer Pointer to the buffer from which data is written
+
+Returns:
+
+ EFI STATUS
+
+--*/
+{
+ EFI_FV_BLOCK_MAP_ENTRY *PtrBlockMapEntry;
+ UINTN BlockIndex2;
+ UINTN LinearOffset;
+ UINTN CurrWriteSize;
+ UINTN CurrWritePtr;
+ UINT8 *CurrBuffer;
+ EFI_LBA LbaNumber;
+ UINTN Size;
+ FRAMEWORK_EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
+ VARIABLE_STORE_HEADER *VolatileBase;
+ EFI_PHYSICAL_ADDRESS FvVolHdr;
+ EFI_PHYSICAL_ADDRESS DataPtr;
+ EFI_STATUS Status;
+
+ FwVolHeader = NULL;
+ DataPtr = DataPtrIndex;
+
+ //
+ // Check if the Data is Volatile
+ //
+ if (!Volatile) {
+ EfiFvbGetPhysicalAddress (Instance, &FvVolHdr);
+ FwVolHeader = (FRAMEWORK_EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) FvVolHdr);
+ //
+ // Data Pointer should point to the actual Address where data is to be
+ // written
+ //
+ if (SetByIndex) {
+ DataPtr += Global->NonVolatileVariableBase;
+ }
+
+ if ((DataPtr + DataSize) >= ((EFI_PHYSICAL_ADDRESS) (UINTN) ((UINT8 *) FwVolHeader + FwVolHeader->FvLength))) {
+ return EFI_INVALID_PARAMETER;
+ }
+ } else {
+ //
+ // Data Pointer should point to the actual Address where data is to be
+ // written
+ //
+ VolatileBase = (VARIABLE_STORE_HEADER *) ((UINTN) Global->VolatileVariableBase);
+ if (SetByIndex) {
+ DataPtr += Global->VolatileVariableBase;
+ }
+
+ if ((DataPtr + DataSize) >= ((UINTN) ((UINT8 *) VolatileBase + VolatileBase->Size))) {
+ return EFI_INVALID_PARAMETER;
+ }
+ }
+ //
+ // If Volatile Variable just do a simple mem copy.
+ //
+ if (Volatile) {
+ CopyMem ((UINT8 *) ((UINTN) DataPtr), Buffer, DataSize);
+ return EFI_SUCCESS;
+ }
+ //
+ // If we are here we are dealing with Non-Volatile Variables
+ //
+ LinearOffset = (UINTN) FwVolHeader;
+ CurrWritePtr = (UINTN) DataPtr;
+ CurrWriteSize = DataSize;
+ CurrBuffer = Buffer;
+ LbaNumber = 0;
+
+ if (CurrWritePtr < LinearOffset) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ for (PtrBlockMapEntry = FwVolHeader->FvBlockMap; PtrBlockMapEntry->NumBlocks != 0; PtrBlockMapEntry++) {
+ for (BlockIndex2 = 0; BlockIndex2 < PtrBlockMapEntry->NumBlocks; BlockIndex2++) {
+ //
+ // Check to see if the Variable Writes are spanning through multiple
+ // blocks.
+ //
+ if ((CurrWritePtr >= LinearOffset) && (CurrWritePtr < LinearOffset + PtrBlockMapEntry->Length)) {
+ if ((CurrWritePtr + CurrWriteSize) <= (LinearOffset + PtrBlockMapEntry->Length)) {
+ Status = EfiFvbWriteBlock (
+ Instance,
+ LbaNumber,
+ (UINTN) (CurrWritePtr - LinearOffset),
+ &CurrWriteSize,
+ CurrBuffer
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ } else {
+ Size = (UINT32) (LinearOffset + PtrBlockMapEntry->Length - CurrWritePtr);
+ Status = EfiFvbWriteBlock (
+ Instance,
+ LbaNumber,
+ (UINTN) (CurrWritePtr - LinearOffset),
+ &Size,
+ CurrBuffer
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ CurrWritePtr = LinearOffset + PtrBlockMapEntry->Length;
+ CurrBuffer = CurrBuffer + Size;
+ CurrWriteSize = CurrWriteSize - Size;
+ }
+ }
+
+ LinearOffset += PtrBlockMapEntry->Length;
+ LbaNumber++;
+ }
+ }
+
+ return EFI_SUCCESS;
+}
+
+STATIC
+VARIABLE_STORE_STATUS
+EFIAPI
+GetVariableStoreStatus (
+ IN VARIABLE_STORE_HEADER *VarStoreHeader
+ )
+/*++
+
+Routine Description:
+
+ This code gets the current status of Variable Store.
+
+Arguments:
+
+ VarStoreHeader Pointer to the Variable Store Header.
+
+Returns:
+
+ EfiRaw Variable store status is raw
+ EfiValid Variable store status is valid
+ EfiInvalid Variable store status is invalid
+
+--*/
+{
+ if (VarStoreHeader->Signature == VARIABLE_STORE_SIGNATURE &&
+ VarStoreHeader->Format == VARIABLE_STORE_FORMATTED &&
+ VarStoreHeader->State == VARIABLE_STORE_HEALTHY
+ ) {
+
+ return EfiValid;
+ } else if (VarStoreHeader->Signature == 0xffffffff &&
+ VarStoreHeader->Size == 0xffffffff &&
+ VarStoreHeader->Format == 0xff &&
+ VarStoreHeader->State == 0xff
+ ) {
+
+ return EfiRaw;
+ } else {
+ return EfiInvalid;
+ }
+}
+
+STATIC
+UINT8 *
+EFIAPI
+GetVariableDataPtr (
+ IN VARIABLE_HEADER *Variable
+ )
+/*++
+
+Routine Description:
+
+ This code gets the pointer to the variable data.
+
+Arguments:
+
+ Variable Pointer to the Variable Header.
+
+Returns:
+
+ UINT8* Pointer to Variable Data
+
+--*/
+{
+ //
+ // Be careful about pad size for alignment
+ //
+ return (UINT8 *) ((UINTN) GET_VARIABLE_NAME_PTR (Variable) + Variable->NameSize + GET_PAD_SIZE (Variable->NameSize));
+}
+
+STATIC
+VARIABLE_HEADER *
+EFIAPI
+GetNextVariablePtr (
+ IN VARIABLE_HEADER *Variable
+ )
+/*++
+
+Routine Description:
+
+ This code gets the pointer to the next variable header.
+
+Arguments:
+
+ Variable Pointer to the Variable Header.
+
+Returns:
+
+ VARIABLE_HEADER* Pointer to next variable header.
+
+--*/
+{
+ if (!IsValidVariableHeader (Variable)) {
+ return NULL;
+ }
+ //
+ // Be careful about pad size for alignment
+ //
+ return (VARIABLE_HEADER *) ((UINTN) GetVariableDataPtr (Variable) + Variable->DataSize + GET_PAD_SIZE (Variable->DataSize));
+}
+
+STATIC
+VARIABLE_HEADER *
+EFIAPI
+GetEndPointer (
+ IN VARIABLE_STORE_HEADER *VarStoreHeader
+ )
+/*++
+
+Routine Description:
+
+ This code gets the pointer to the last variable memory pointer byte
+
+Arguments:
+
+ VarStoreHeader Pointer to the Variable Store Header.
+
+Returns:
+
+ VARIABLE_HEADER* Pointer to last unavailable Variable Header
+
+--*/
+{
+ //
+ // The end of variable store
+ //
+ return (VARIABLE_HEADER *) ((UINTN) VarStoreHeader + VarStoreHeader->Size);
+}
+
+STATIC
+EFI_STATUS
+EFIAPI
+Reclaim (
+ IN EFI_PHYSICAL_ADDRESS VariableBase,
+ OUT UINTN *LastVariableOffset,
+ IN BOOLEAN IsVolatile
+ )
+/*++
+
+Routine Description:
+
+ Variable store garbage collection and reclaim operation
+
+Arguments:
+
+ VariableBase Base address of variable store
+ LastVariableOffset Offset of last variable
+ IsVolatile The variable store is volatile or not,
+ if it is non-volatile, need FTW
+
+Returns:
+
+ EFI STATUS
+
+--*/
+{
+ VARIABLE_HEADER *Variable;
+ VARIABLE_HEADER *NextVariable;
+ VARIABLE_STORE_HEADER *VariableStoreHeader;
+ UINT8 *ValidBuffer;
+ UINTN ValidBufferSize;
+ UINTN VariableSize;
+ UINT8 *CurrPtr;
+ EFI_STATUS Status;
+
+ VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) VariableBase);
+
+ //
+ // Start Pointers for the variable.
+ //
+ Variable = (VARIABLE_HEADER *) (VariableStoreHeader + 1);
+
+ ValidBufferSize = sizeof (VARIABLE_STORE_HEADER);
+
+ while (IsValidVariableHeader (Variable)) {
+ NextVariable = GetNextVariablePtr (Variable);
+ if (Variable->State == VAR_ADDED) {
+ VariableSize = (UINTN) NextVariable - (UINTN) Variable;
+ ValidBufferSize += VariableSize;
+ }
+
+ Variable = NextVariable;
+ }
+
+ ValidBuffer = AllocatePool (ValidBufferSize);
+ if (ValidBuffer == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ SetMem (ValidBuffer, ValidBufferSize, 0xff);
+
+ CurrPtr = ValidBuffer;
+
+ //
+ // Copy variable store header
+ //
+ CopyMem (CurrPtr, VariableStoreHeader, sizeof (VARIABLE_STORE_HEADER));
+ CurrPtr += sizeof (VARIABLE_STORE_HEADER);
+
+ //
+ // Start Pointers for the variable.
+ //
+ Variable = (VARIABLE_HEADER *) (VariableStoreHeader + 1);
+
+ while (IsValidVariableHeader (Variable)) {
+ NextVariable = GetNextVariablePtr (Variable);
+ if (Variable->State == VAR_ADDED) {
+ VariableSize = (UINTN) NextVariable - (UINTN) Variable;
+ CopyMem (CurrPtr, (UINT8 *) Variable, VariableSize);
+ CurrPtr += 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, ValidBufferSize);
+ *LastVariableOffset = ValidBufferSize;
+ Status = EFI_SUCCESS;
+ } else {
+ //
+ // If non-volatile variable store, perform FTW here.
+ //
+ Status = FtwVariableSpace (
+ VariableBase,
+ ValidBuffer,
+ ValidBufferSize
+ );
+ if (!EFI_ERROR (Status)) {
+ *LastVariableOffset = ValidBufferSize;
+ }
+ }
+
+ FreePool (ValidBuffer);
+
+ if (EFI_ERROR (Status)) {
+ *LastVariableOffset = 0;
+ }
+
+ return Status;
+}
+
+STATIC
+EFI_STATUS
+EFIAPI
+FindVariable (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ OUT VARIABLE_POINTER_TRACK *PtrTrack,
+ IN VARIABLE_GLOBAL *Global
+ )
+/*++
+
+Routine Description:
+
+ This code finds variable in storage blocks (Volatile or Non-Volatile)
+
+Arguments:
+
+ VariableName Name of the variable to be found
+ VendorGuid Vendor GUID to be found.
+ PtrTrack Variable Track Pointer structure that contains
+ Variable Information.
+ Contains the pointer of Variable header.
+ Global VARIABLE_GLOBAL pointer
+
+Returns:
+
+ EFI STATUS
+
+--*/
+{
+ VARIABLE_HEADER *Variable[2];
+ VARIABLE_STORE_HEADER *VariableStoreHeader[2];
+ UINTN Index;
+
+ //
+ // We aquire the lock at the entry of FindVariable as GetVariable, GetNextVariableName
+ // SetVariable all call FindVariable at entry point. Please move "Aquire Lock" to
+ // the correct places if this assumption does not hold TRUE anymore.
+ //
+ AcquireLockOnlyAtBootTime(&Global->VariableServicesLock);
+
+ //
+ // 0: Non-Volatile, 1: Volatile
+ //
+ VariableStoreHeader[0] = (VARIABLE_STORE_HEADER *) ((UINTN) Global->NonVolatileVariableBase);
+ VariableStoreHeader[1] = (VARIABLE_STORE_HEADER *) ((UINTN) Global->VolatileVariableBase);
+
+ //
+ // Start Pointers for the variable.
+ // Actual Data Pointer where data can be written.
+ //
+ Variable[0] = (VARIABLE_HEADER *) (VariableStoreHeader[0] + 1);
+ Variable[1] = (VARIABLE_HEADER *) (VariableStoreHeader[1] + 1);
+
+ if (VariableName[0] != 0 && VendorGuid == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+ //
+ // Find the variable by walk through non-volatile and volatile variable store
+ //
+ for (Index = 0; Index < 2; Index++) {
+ PtrTrack->StartPtr = (VARIABLE_HEADER *) (VariableStoreHeader[Index] + 1);
+ PtrTrack->EndPtr = GetEndPointer (VariableStoreHeader[Index]);
+
+ while (IsValidVariableHeader (Variable[Index]) && (Variable[Index] <= GetEndPointer (VariableStoreHeader[Index]))) {
+ if (Variable[Index]->State == VAR_ADDED) {
+ if (!(EfiAtRuntime () && !(Variable[Index]->Attributes & EFI_VARIABLE_RUNTIME_ACCESS))) {
+ if (VariableName[0] == 0) {
+ PtrTrack->CurrPtr = Variable[Index];
+ PtrTrack->Volatile = (BOOLEAN) Index;
+ return EFI_SUCCESS;
+ } else {
+ if (CompareGuid (VendorGuid, &Variable[Index]->VendorGuid)) {
+ if (!CompareMem (VariableName, GET_VARIABLE_NAME_PTR (Variable[Index]), Variable[Index]->NameSize)) {
+ PtrTrack->CurrPtr = Variable[Index];
+ PtrTrack->Volatile = (BOOLEAN) Index;
+ return EFI_SUCCESS;
+ }
+ }
+ }
+ }
+ }
+
+ Variable[Index] = GetNextVariablePtr (Variable[Index]);
+ }
+ //
+ // While (...)
+ //
+ }
+ //
+ // for (...)
+ //
+ PtrTrack->CurrPtr = NULL;
+ return EFI_NOT_FOUND;
+}
+
+EFI_STATUS
+EFIAPI
+GetVariable (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID * VendorGuid,
+ OUT UINT32 *Attributes OPTIONAL,
+ IN OUT UINTN *DataSize,
+ OUT VOID *Data,
+ IN VARIABLE_GLOBAL * Global,
+ IN UINT32 Instance
+ )
+/*++
+
+Routine Description:
+
+ This code finds variable in storage blocks (Volatile or Non-Volatile)
+
+Arguments:
+
+ VariableName Name of Variable to be found
+ VendorGuid Variable vendor GUID
+ Attributes OPTIONAL Attribute value of the variable found
+ DataSize Size of Data found. If size is less than the
+ data, this value contains the required size.
+ Data Data pointer
+ Global Pointer to VARIABLE_GLOBAL structure
+ Instance Instance of the Firmware Volume.
+
+Returns:
+
+ EFI STATUS
+
+--*/
+{
+ VARIABLE_POINTER_TRACK Variable;
+ UINTN VarDataSize;
+ EFI_STATUS Status;
+
+ if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+ //
+ // Find existing variable
+ //
+ Status = FindVariable (VariableName, VendorGuid, &Variable, Global);
+
+ if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // Get data size
+ //
+ VarDataSize = Variable.CurrPtr->DataSize;
+ if (*DataSize >= VarDataSize) {
+ if (Data == NULL) {
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ }
+
+ CopyMem (Data, GetVariableDataPtr (Variable.CurrPtr), VarDataSize);
+ if (Attributes != NULL) {
+ *Attributes = Variable.CurrPtr->Attributes;
+ }
+
+ *DataSize = VarDataSize;
+ Status = EFI_SUCCESS;
+ goto Done;
+ } else {
+ *DataSize = VarDataSize;
+ Status = EFI_BUFFER_TOO_SMALL;
+ goto Done;
+ }
+
+Done:
+ ReleaseLockOnlyAtBootTime (&Global->VariableServicesLock);
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+GetNextVariableName (
+ IN OUT UINTN *VariableNameSize,
+ IN OUT CHAR16 *VariableName,
+ IN OUT EFI_GUID *VendorGuid,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINT32 Instance
+ )
+/*++
+
+Routine Description:
+
+ This code Finds the Next available variable
+
+Arguments:
+
+ VariableNameSize Size of the variable
+ VariableName Pointer to variable name
+ VendorGuid Variable Vendor Guid
+ Global VARIABLE_GLOBAL structure pointer.
+ Instance FV instance
+
+Returns:
+
+ EFI STATUS
+
+--*/
+{
+ VARIABLE_POINTER_TRACK Variable;
+ UINTN VarNameSize;
+ EFI_STATUS Status;
+
+ if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ Status = FindVariable (VariableName, VendorGuid, &Variable, Global);
+
+ if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ if (VariableName[0] != 0) {
+ //
+ // If variable name is not NULL, get next variable
+ //
+ Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
+ }
+
+ while (TRUE) {
+ //
+ // If both volatile and non-volatile variable store are parsed,
+ // return not found
+ //
+ if (Variable.CurrPtr >= Variable.EndPtr || Variable.CurrPtr == NULL) {
+ Variable.Volatile = (BOOLEAN) (Variable.Volatile ^ ((BOOLEAN) 0x1));
+ if (Variable.Volatile) {
+ Variable.StartPtr = (VARIABLE_HEADER *) ((UINTN) (Global->VolatileVariableBase + sizeof (VARIABLE_STORE_HEADER)));
+ Variable.EndPtr = (VARIABLE_HEADER *) GetEndPointer ((VARIABLE_STORE_HEADER *) ((UINTN) Global->VolatileVariableBase));
+ } else {
+ Status = EFI_NOT_FOUND;
+ goto Done;
+ }
+
+ Variable.CurrPtr = Variable.StartPtr;
+ if (!IsValidVariableHeader (Variable.CurrPtr)) {
+ continue;
+ }
+ }
+ //
+ // Variable is found
+ //
+ if (IsValidVariableHeader (Variable.CurrPtr) && Variable.CurrPtr->State == VAR_ADDED) {
+ if (!(EfiAtRuntime () && !(Variable.CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS))) {
+ VarNameSize = Variable.CurrPtr->NameSize;
+ if (VarNameSize <= *VariableNameSize) {
+ CopyMem (
+ VariableName,
+ GET_VARIABLE_NAME_PTR (Variable.CurrPtr),
+ VarNameSize
+ );
+ CopyMem (
+ VendorGuid,
+ &Variable.CurrPtr->VendorGuid,
+ sizeof (EFI_GUID)
+ );
+ Status = EFI_SUCCESS;
+ } else {
+ Status = EFI_BUFFER_TOO_SMALL;
+ }
+
+ *VariableNameSize = VarNameSize;
+ goto Done;
+ }
+ }
+
+ Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
+ }
+
+Done:
+ ReleaseLockOnlyAtBootTime (&Global->VariableServicesLock);
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+SetVariable (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN UINT32 Attributes,
+ IN UINTN DataSize,
+ IN VOID *Data,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINTN *VolatileOffset,
+ IN UINTN *NonVolatileOffset,
+ IN UINT32 Instance
+ )
+/*++
+
+Routine Description:
+
+ This code sets variable in storage blocks (Volatile or Non-Volatile)
+
+Arguments:
+
+ VariableName Name of Variable to be found
+ VendorGuid Variable vendor GUID
+ Attributes Attribute value of the variable found
+ DataSize Size of Data found. If size is less than the
+ data, this value contains the required size.
+ Data Data pointer
+ Global Pointer to VARIABLE_GLOBAL structure
+ VolatileOffset The offset of last volatile variable
+ NonVolatileOffset The offset of last non-volatile variable
+ Instance Instance of the Firmware Volume.
+
+Returns:
+
+ EFI STATUS
+ EFI_INVALID_PARAMETER - Invalid parameter
+ EFI_SUCCESS - Set successfully
+ EFI_OUT_OF_RESOURCES - Resource not enough to set variable
+ EFI_NOT_FOUND - Not found
+
+--*/
+{
+ VARIABLE_POINTER_TRACK Variable;
+ EFI_STATUS Status;
+ VARIABLE_HEADER *NextVariable;
+ UINTN VarNameSize;
+ UINTN VarNameOffset;
+ UINTN VarDataOffset;
+ UINTN VarSize;
+ UINT8 State;
+ BOOLEAN Reclaimed;
+
+ Reclaimed = FALSE;
+
+ if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ Status = FindVariable (VariableName, VendorGuid, &Variable, Global);
+
+ if (Status == EFI_INVALID_PARAMETER) {
+ goto Done;
+ } else if (!EFI_ERROR (Status) && Variable.Volatile && 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.
+ //
+ Status = EFI_WRITE_PROTECTED;
+ goto Done;
+ } else if (sizeof (VARIABLE_HEADER) + StrSize (VariableName) + DataSize > MAX_VARIABLE_SIZE) {
+ //
+ // The size of the VariableName, including the Unicode Null in bytes plus
+ // the DataSize is limited to maximum size of MAX_VARIABLE_SIZE (1024) bytes.
+ //
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ } else if (Attributes == EFI_VARIABLE_NON_VOLATILE) {
+ //
+ // Make sure not only EFI_VARIABLE_NON_VOLATILE is set
+ //
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ } 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
+ //
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ } else if (EfiAtRuntime () && Attributes && !(Attributes & EFI_VARIABLE_RUNTIME_ACCESS)) {
+ //
+ // Runtime but Attribute is not Runtime
+ //
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ } else if (EfiAtRuntime () && Attributes && !(Attributes & EFI_VARIABLE_NON_VOLATILE)) {
+ //
+ // Cannot set volatile variable in Runtime
+ //
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ } else if (DataSize == 0 || (Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0) {
+ //
+ // Setting a data variable with no access, or zero DataSize attributes
+ // specified causes it to be deleted.
+ //
+ if (!EFI_ERROR (Status)) {
+ State = Variable.CurrPtr->State;
+ State &= VAR_DELETED;
+
+ Status = UpdateVariableStore (
+ Global,
+ Variable.Volatile,
+ FALSE,
+ Instance,
+ (UINTN) &Variable.CurrPtr->State,
+ sizeof (UINT8),
+ &State
+ );
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ Status = EFI_SUCCESS;
+ goto Done;
+ }
+
+ Status = EFI_NOT_FOUND;
+ goto Done;
+ } else {
+ if (!EFI_ERROR (Status)) {
+ //
+ // If the variable is marked valid and the same data has been passed in
+ // then return to the caller immediately.
+ //
+ if (Variable.CurrPtr->DataSize == DataSize &&
+ !CompareMem (Data, GetVariableDataPtr (Variable.CurrPtr), DataSize)
+ ) {
+ Status = EFI_SUCCESS;
+ goto Done;
+ } else if (Variable.CurrPtr->State == VAR_ADDED) {
+ //
+ // Mark the old variable as in delete transition
+ //
+ State = Variable.CurrPtr->State;
+ State &= VAR_IN_DELETED_TRANSITION;
+
+ Status = UpdateVariableStore (
+ Global,
+ Variable.Volatile,
+ FALSE,
+ Instance,
+ (UINTN) &Variable.CurrPtr->State,
+ sizeof (UINT8),
+ &State
+ );
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ }
+ }
+ //
+ // Create a new variable and copy the data.
+ //
+ // Tricky part: Use scratch data area at the end of volatile variable store
+ // as a temporary storage.
+ //
+ NextVariable = GetEndPointer ((VARIABLE_STORE_HEADER *) ((UINTN) Global->VolatileVariableBase));
+
+ SetMem (NextVariable, SCRATCH_SIZE, 0xff);
+
+ NextVariable->StartId = VARIABLE_DATA;
+ NextVariable->Attributes = Attributes;
+ //
+ // NextVariable->State = VAR_ADDED;
+ //
+ NextVariable->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 (&NextVariable->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
+ //
+ NextVariable->NameSize = (UINT32)VarNameSize;
+ NextVariable->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) {
+ if ((UINT32) (VarSize +*NonVolatileOffset) >
+ ((VARIABLE_STORE_HEADER *) ((UINTN) (Global->NonVolatileVariableBase)))->Size
+ ) {
+ if (EfiAtRuntime ()) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto Done;
+ }
+ //
+ // Perform garbage collection & reclaim operation
+ //
+ Status = Reclaim (Global->NonVolatileVariableBase, NonVolatileOffset, FALSE);
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // If still no enough space, return out of resources
+ //
+ if ((UINT32) (VarSize +*NonVolatileOffset) >
+ ((VARIABLE_STORE_HEADER *) ((UINTN) (Global->NonVolatileVariableBase)))->Size
+ ) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto Done;
+ }
+
+ Reclaimed = TRUE;
+ }
+ //
+ // Three steps
+ // 1. Write variable header
+ // 2. Write variable data
+ // 3. Set variable state to valid
+ //
+ //
+ // Step 1:
+ //
+ Status = UpdateVariableStore (
+ Global,
+ FALSE,
+ TRUE,
+ Instance,
+ *NonVolatileOffset,
+ sizeof (VARIABLE_HEADER),
+ (UINT8 *) NextVariable
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // Step 2:
+ //
+ Status = UpdateVariableStore (
+ Global,
+ FALSE,
+ TRUE,
+ Instance,
+ *NonVolatileOffset + sizeof (VARIABLE_HEADER),
+ (UINT32) VarSize - sizeof (VARIABLE_HEADER),
+ (UINT8 *) NextVariable + sizeof (VARIABLE_HEADER)
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // Step 3:
+ //
+ NextVariable->State = VAR_ADDED;
+ Status = UpdateVariableStore (
+ Global,
+ FALSE,
+ TRUE,
+ Instance,
+ *NonVolatileOffset,
+ sizeof (VARIABLE_HEADER),
+ (UINT8 *) NextVariable
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ *NonVolatileOffset = *NonVolatileOffset + VarSize;
+
+ } else {
+ if (EfiAtRuntime ()) {
+ Status = EFI_INVALID_PARAMETER;
+ goto Done;
+ }
+
+ if ((UINT32) (VarSize +*VolatileOffset) >
+ ((VARIABLE_STORE_HEADER *) ((UINTN) (Global->VolatileVariableBase)))->Size
+ ) {
+ //
+ // Perform garbage collection & reclaim operation
+ //
+ Status = Reclaim (Global->VolatileVariableBase, VolatileOffset, TRUE);
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // If still no enough space, return out of resources
+ //
+ if ((UINT32) (VarSize +*VolatileOffset) >
+ ((VARIABLE_STORE_HEADER *) ((UINTN) (Global->VolatileVariableBase)))->Size
+ ) {
+ Status = EFI_OUT_OF_RESOURCES;
+ goto Done;
+ }
+
+ Reclaimed = TRUE;
+ }
+
+ NextVariable->State = VAR_ADDED;
+ Status = UpdateVariableStore (
+ Global,
+ TRUE,
+ TRUE,
+ Instance,
+ *VolatileOffset,
+ (UINT32) VarSize,
+ (UINT8 *) NextVariable
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ *VolatileOffset = *VolatileOffset + VarSize;
+ }
+ //
+ // Mark the old variable as deleted
+ //
+ if (!Reclaimed && !EFI_ERROR (Status) && Variable.CurrPtr != NULL) {
+ State = Variable.CurrPtr->State;
+ State &= VAR_DELETED;
+
+ Status = UpdateVariableStore (
+ Global,
+ Variable.Volatile,
+ FALSE,
+ Instance,
+ (UINTN) &Variable.CurrPtr->State,
+ sizeof (UINT8),
+ &State
+ );
+
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ }
+ }
+
+ Status = EFI_SUCCESS;
+Done:
+ ReleaseLockOnlyAtBootTime (&Global->VariableServicesLock);
+ return Status;
+}
+
+EFI_STATUS
+EFIAPI
+QueryVariableInfo (
+ IN UINT32 Attributes,
+ OUT UINT64 *MaximumVariableStorageSize,
+ OUT UINT64 *RemainingVariableStorageSize,
+ OUT UINT64 *MaximumVariableSize,
+ IN VARIABLE_GLOBAL *Global,
+ IN UINT32 Instance
+ )
+/*++
+
+Routine Description:
+
+ This code returns information about the EFI variables.
+
+Arguments:
+
+ Attributes Attributes bitmask to specify the type of variables
+ on which to return information.
+ MaximumVariableStorageSize Pointer to the maximum size of the storage space available
+ for the EFI variables associated with the attributes specified.
+ RemainingVariableStorageSize Pointer to the remaining size of the storage space available
+ for the EFI variables associated with the attributes specified.
+ MaximumVariableSize Pointer to the maximum size of the individual EFI variables
+ associated with the attributes specified.
+ Global Pointer to VARIABLE_GLOBAL structure.
+ Instance Instance of the Firmware Volume.
+
+Returns:
+
+ EFI STATUS
+ EFI_INVALID_PARAMETER - An invalid combination of attribute bits was supplied.
+ EFI_SUCCESS - Query successfully.
+ EFI_UNSUPPORTED - The attribute is not supported on this platform.
+
+--*/
+{
+ VARIABLE_HEADER *Variable;
+ VARIABLE_HEADER *NextVariable;
+ UINT64 VariableSize;
+ VARIABLE_STORE_HEADER *VariableStoreHeader;
+
+ if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS)) == 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)) {
+ //
+ // Make sure RT Attribute is set if we are in Runtime phase.
+ //
+ return EFI_INVALID_PARAMETER;
+ }
+
+ AcquireLockOnlyAtBootTime(&Global->VariableServicesLock);
+
+ if((Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
+ //
+ // Query is Volatile related.
+ //
+ VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) Global->VolatileVariableBase);
+ } else {
+ //
+ // Query is Non-Volatile related.
+ //
+ VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) Global->NonVolatileVariableBase);
+ }
+
+ //
+ // Now let's fill *MaximumVariableStorageSize *RemainingVariableStorageSize
+ // with the storage size (excluding the storage header size).
+ //
+ *MaximumVariableStorageSize = VariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER);
+ *RemainingVariableStorageSize = VariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER);
+
+ //
+ // Let *MaximumVariableSize be MAX_VARIABLE_SIZE.
+ //
+ *MaximumVariableSize = MAX_VARIABLE_SIZE;
+
+ //
+ // Point to the starting address of the variables.
+ //
+ Variable = (VARIABLE_HEADER *) (VariableStoreHeader + 1);
+
+ //
+ // Now walk through the related variable store.
+ //
+ while (IsValidVariableHeader (Variable) && (Variable < GetEndPointer (VariableStoreHeader))) {
+ NextVariable = GetNextVariablePtr (Variable);
+ VariableSize = (UINT64) (UINTN) NextVariable - (UINT64) (UINTN) 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.
+ //
+ *RemainingVariableStorageSize -= VariableSize;
+ } else {
+ //
+ // Only care about Variables with State VAR_ADDED,because
+ // the space not marked as VAR_ADDED is reclaimable now.
+ //
+ if (Variable->State == VAR_ADDED) {
+ *RemainingVariableStorageSize -= VariableSize;
+ }
+ }
+
+ //
+ // Go to the next one
+ //
+ Variable = NextVariable;
+ }
+
+ ReleaseLockOnlyAtBootTime (&Global->VariableServicesLock);
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VariableCommonInitialize (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+/*++
+
+Routine Description:
+ This function does common initialization for variable services
+
+Arguments:
+
+ ImageHandle - The firmware allocated handle for the EFI image.
+ SystemTable - A pointer to the EFI System Table.
+
+Returns:
+
+ Status code.
+
+ EFI_NOT_FOUND - Variable store area not found.
+ EFI_UNSUPPORTED - Currently only one non-volatile variable store is supported.
+ EFI_SUCCESS - Variable services successfully initialized.
+
+--*/
+{
+ EFI_STATUS Status;
+ EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
+ CHAR8 *CurrPtr;
+ VARIABLE_STORE_HEADER *VolatileVariableStore;
+ VARIABLE_STORE_HEADER *VariableStoreHeader;
+ VARIABLE_HEADER *NextVariable;
+ UINT32 Instance;
+ EFI_PHYSICAL_ADDRESS FvVolHdr;
+
+ UINT64 TempVariableStoreHeader;
+
+ EFI_GCD_MEMORY_SPACE_DESCRIPTOR GcdDescriptor;
+ EFI_FLASH_SUBAREA_ENTRY VariableStoreEntry;
+ UINT64 BaseAddress;
+ UINT64 Length;
+ UINTN Index;
+ UINT8 Data;
+
+ mVariableModuleGlobal = AllocateRuntimePool (sizeof (ESAL_VARIABLE_GLOBAL));
+ if (mVariableModuleGlobal == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ EfiInitializeLock(&mVariableModuleGlobal->VariableGlobal[Physical].VariableServicesLock, TPL_NOTIFY);
+
+ //
+ // Allocate memory for volatile variable store
+ //
+ VolatileVariableStore = AllocateRuntimePool (VARIABLE_STORE_SIZE + SCRATCH_SIZE);
+ if (VolatileVariableStore == NULL) {
+ FreePool (mVariableModuleGlobal);
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ SetMem (VolatileVariableStore, VARIABLE_STORE_SIZE + SCRATCH_SIZE, 0xff);
+
+ //
+ // Variable Specific Data
+ //
+ mVariableModuleGlobal->VariableGlobal[Physical].VolatileVariableBase = (EFI_PHYSICAL_ADDRESS) (UINTN) VolatileVariableStore;
+ mVariableModuleGlobal->VolatileLastVariableOffset = sizeof (VARIABLE_STORE_HEADER);
+
+ VolatileVariableStore->Signature = VARIABLE_STORE_SIGNATURE;
+ VolatileVariableStore->Size = VARIABLE_STORE_SIZE;
+ 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);
+ VariableStoreEntry.Base = TempVariableStoreHeader + \
+ (((EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) (TempVariableStoreHeader)) -> HeaderLength);
+ VariableStoreEntry.Length = (UINT64) PcdGet32 (PcdFlashNvStorageVariableSize) - \
+ (((EFI_FIRMWARE_VOLUME_HEADER *) (UINTN) (TempVariableStoreHeader)) -> HeaderLength);
+ //
+ // Mark the variable storage region of the FLASH as RUNTIME
+ //
+ BaseAddress = VariableStoreEntry.Base & (~EFI_PAGE_MASK);
+ Length = VariableStoreEntry.Length + (VariableStoreEntry.Base - BaseAddress);
+ Length = (Length + EFI_PAGE_SIZE - 1) & (~EFI_PAGE_MASK);
+
+ Status = gDS->GetMemorySpaceDescriptor (BaseAddress, &GcdDescriptor);
+ if (EFI_ERROR (Status)) {
+ FreePool (mVariableModuleGlobal);
+ FreePool (VolatileVariableStore);
+ return EFI_UNSUPPORTED;
+ }
+
+ Status = gDS->SetMemorySpaceAttributes (
+ BaseAddress,
+ Length,
+ GcdDescriptor.Attributes | EFI_MEMORY_RUNTIME
+ );
+ if (EFI_ERROR (Status)) {
+ FreePool (mVariableModuleGlobal);
+ FreePool (VolatileVariableStore);
+ return EFI_UNSUPPORTED;
+ }
+ //
+ // Get address of non volatile variable store base
+ //
+ mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase = VariableStoreEntry.Base;
+
+ //
+ // Check Integrity
+ //
+ //
+ // Find the Correct Instance of the FV Block Service.
+ //
+ Instance = 0;
+ CurrPtr = (CHAR8 *) ((UINTN) mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase);
+ while (EfiFvbGetPhysicalAddress (Instance, &FvVolHdr) == EFI_SUCCESS) {
+ FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) FvVolHdr);
+ if (CurrPtr >= (CHAR8 *) FwVolHeader && CurrPtr < (((CHAR8 *) FwVolHeader) + FwVolHeader->FvLength)) {
+ mVariableModuleGlobal->FvbInstance = Instance;
+ break;
+ }
+
+ Instance++;
+ }
+
+ VariableStoreHeader = (VARIABLE_STORE_HEADER *) CurrPtr;
+ if (GetVariableStoreStatus (VariableStoreHeader) == EfiValid) {
+ if (~VariableStoreHeader->Size == 0) {
+ Status = UpdateVariableStore (
+ &mVariableModuleGlobal->VariableGlobal[Physical],
+ FALSE,
+ FALSE,
+ mVariableModuleGlobal->FvbInstance,
+ (UINTN) &VariableStoreHeader->Size,
+ sizeof (UINT32),
+ (UINT8 *) &VariableStoreEntry.Length
+ );
+ //
+ // 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 == VariableStoreEntry.Length);
+
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+ }
+
+ mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase = (EFI_PHYSICAL_ADDRESS) ((UINTN) CurrPtr);
+ //
+ // Parse non-volatile variable data and get last variable offset
+ //
+ NextVariable = (VARIABLE_HEADER *) (CurrPtr + sizeof (VARIABLE_STORE_HEADER));
+ Status = EFI_SUCCESS;
+
+ while (IsValidVariableHeader (NextVariable)) {
+ NextVariable = GetNextVariablePtr (NextVariable);
+ }
+
+ mVariableModuleGlobal->NonVolatileLastVariableOffset = (UINTN) NextVariable - (UINTN) CurrPtr;
+
+ //
+ // Check if the free area is blow a threshold
+ //
+ if ((((VARIABLE_STORE_HEADER *)((UINTN) CurrPtr))->Size - mVariableModuleGlobal->NonVolatileLastVariableOffset) < VARIABLE_RECLAIM_THRESHOLD) {
+ Status = Reclaim (
+ mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase,
+ &mVariableModuleGlobal->NonVolatileLastVariableOffset,
+ FALSE
+ );
+ }
+
+ if (EFI_ERROR (Status)) {
+ FreePool (mVariableModuleGlobal);
+ FreePool (VolatileVariableStore);
+ return Status;
+ }
+
+ //
+ // 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
+ );
+ break;
+ }
+ }
+ }
+
+ if (EFI_ERROR (Status)) {
+ FreePool (mVariableModuleGlobal);
+ FreePool (VolatileVariableStore);
+ }
+
+ return Status;
+}
|