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audk/MdeModulePkg/Universal/Variable/RuntimeDxe/Variable.c

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/*++
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 <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;
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 = (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->BlockMap; 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;
}
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