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qemu / edk2 / refs/heads/UDK2018_TreeCheckIn / . / MdeModulePkg / Universal / Variable / RuntimeDxe / Variable.c
blob: c11842b5c3ba742f440eaf474234c4deec9c5c27 [file] [log] [blame]
/** @file
The common variable operation routines shared by DXE_RUNTIME variable
module and DXE_SMM variable module.
Caution: This module requires additional review when modified.
This driver will have external input - variable data. They may be input in SMM mode.
This external input must be validated carefully to avoid security issue like
buffer overflow, integer overflow.
VariableServiceGetNextVariableName () and VariableServiceQueryVariableInfo() are external API.
They need check input parameter.
VariableServiceGetVariable() and VariableServiceSetVariable() are external API
to receive datasize and data buffer. The size should be checked carefully.
VariableServiceSetVariable() should also check authenticate data to avoid buffer overflow,
integer overflow. It should also check attribute to avoid authentication bypass.
Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
(C) Copyright 2015 Hewlett Packard Enterprise Development LP<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"
VARIABLE_MODULE_GLOBAL *mVariableModuleGlobal;
///
/// Define a memory cache that improves the search performance for a variable.
///
VARIABLE_STORE_HEADER *mNvVariableCache = NULL;
///
/// Memory cache of Fv Header.
///
EFI_FIRMWARE_VOLUME_HEADER *mNvFvHeaderCache = NULL;
///
/// The memory entry used for variable statistics data.
///
VARIABLE_INFO_ENTRY *gVariableInfo = NULL;
///
/// The flag to indicate whether the platform has left the DXE phase of execution.
///
BOOLEAN mEndOfDxe = FALSE;
///
/// It indicates the var check request source.
/// In the implementation, DXE is regarded as untrusted, and SMM is trusted.
///
VAR_CHECK_REQUEST_SOURCE mRequestSource = VarCheckFromUntrusted;
//
// It will record the current boot error flag before EndOfDxe.
//
VAR_ERROR_FLAG mCurrentBootVarErrFlag = VAR_ERROR_FLAG_NO_ERROR;
VARIABLE_ENTRY_PROPERTY mVariableEntryProperty[] = {
{
&gEdkiiVarErrorFlagGuid,
VAR_ERROR_FLAG_NAME,
{
VAR_CHECK_VARIABLE_PROPERTY_REVISION,
VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY,
VARIABLE_ATTRIBUTE_NV_BS_RT,
sizeof (VAR_ERROR_FLAG),
sizeof (VAR_ERROR_FLAG)
}
},
};
AUTH_VAR_LIB_CONTEXT_IN mAuthContextIn = {
AUTH_VAR_LIB_CONTEXT_IN_STRUCT_VERSION,
//
// StructSize, TO BE FILLED
//
0,
//
// MaxAuthVariableSize, TO BE FILLED
//
0,
VariableExLibFindVariable,
VariableExLibFindNextVariable,
VariableExLibUpdateVariable,
VariableExLibGetScratchBuffer,
VariableExLibCheckRemainingSpaceForConsistency,
VariableExLibAtRuntime,
};
AUTH_VAR_LIB_CONTEXT_OUT mAuthContextOut;
/**
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 (AtRuntime ()) {
// 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 = AllocateZeroPool (StrSize (VariableName));
ASSERT (gVariableInfo->Name != NULL);
StrCpyS (gVariableInfo->Name, StrSize(VariableName)/sizeof(CHAR16), VariableName);
gVariableInfo->Volatile = Volatile;
}
for (Entry = gVariableInfo; Entry != NULL; Entry = Entry->Next) {
if (CompareGuid (VendorGuid, &Entry->VendorGuid)) {
if (StrCmp (VariableName, Entry->Name) == 0) {
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 = AllocateZeroPool (StrSize (VariableName));
ASSERT (Entry->Next->Name != NULL);
StrCpyS (Entry->Next->Name, StrSize(VariableName)/sizeof(CHAR16), VariableName);
Entry->Next->Volatile = Volatile;
}
}
}
}
/**
This code checks if variable header is valid or not.
@param Variable Pointer to the Variable Header.
@param VariableStoreEnd Pointer to the Variable Store End.
@retval TRUE Variable header is valid.
@retval FALSE Variable header is not valid.
**/
BOOLEAN
IsValidVariableHeader (
IN VARIABLE_HEADER *Variable,
IN VARIABLE_HEADER *VariableStoreEnd
)
{
if ((Variable == NULL) || (Variable >= VariableStoreEnd) || (Variable->StartId != VARIABLE_DATA)) {
//
// Variable is NULL or has reached the end of variable store,
// or the StartId is not correct.
//
return FALSE;
}
return TRUE;
}
/**
This function writes data to the FWH at the correct LBA even if the LBAs
are fragmented.
@param Global Pointer to VARAIBLE_GLOBAL structure.
@param Volatile Point out the Variable is Volatile or Non-Volatile.
@param SetByIndex TRUE if target pointer is given as index.
FALSE if target pointer is absolute.
@param Fvb Pointer to the writable FVB protocol.
@param DataPtrIndex Pointer to the Data from the end of VARIABLE_STORE_HEADER
structure.
@param DataSize Size of data to be written.
@param Buffer Pointer to the buffer from which data is written.
@retval EFI_INVALID_PARAMETER Parameters not valid.
@retval EFI_SUCCESS Variable store successfully updated.
**/
EFI_STATUS
UpdateVariableStore (
IN VARIABLE_GLOBAL *Global,
IN BOOLEAN Volatile,
IN BOOLEAN SetByIndex,
IN EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb,
IN UINTN DataPtrIndex,
IN UINT32 DataSize,
IN UINT8 *Buffer
)
{
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) {
if (Fvb == NULL) {
return EFI_INVALID_PARAMETER;
}
Status = Fvb->GetPhysicalAddress(Fvb, &FvVolHdr);
ASSERT_EFI_ERROR (Status);
FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *) ((UINTN) FvVolHdr);
//
// Data Pointer should point to the actual Address where data is to be
// written.
//
if (SetByIndex) {
DataPtr += mVariableModuleGlobal->VariableGlobal.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) mVariableModuleGlobal->VariableGlobal.VolatileVariableBase);
if (SetByIndex) {
DataPtr += mVariableModuleGlobal->VariableGlobal.VolatileVariableBase;
}
if ((DataPtr + DataSize) >= ((UINTN) ((UINT8 *) VolatileBase + VolatileBase->Size))) {
return EFI_INVALID_PARAMETER;
}
//
// If Volatile Variable just do a simple mem copy.
//
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 = mNvFvHeaderCache->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 = Fvb->Write (
Fvb,
LbaNumber,
(UINTN) (CurrWritePtr - LinearOffset),
&CurrWriteSize,
CurrBuffer
);
return Status;
} else {
Size = (UINT32) (LinearOffset + PtrBlockMapEntry->Length - CurrWritePtr);
Status = Fvb->Write (
Fvb,
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;
}
/**
This code gets the current status of Variable Store.
@param VarStoreHeader Pointer to the Variable Store Header.
@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) ||
CompareGuid (&VarStoreHeader->Signature, &gEfiVariableGuid)) &&
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;
}
}
/**
This code gets the size of variable header.
@return Size of variable header in bytes in type UINTN.
**/
UINTN
GetVariableHeaderSize (
VOID
)
{
UINTN Value;
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
Value = sizeof (AUTHENTICATED_VARIABLE_HEADER);
} else {
Value = sizeof (VARIABLE_HEADER);
}
return Value;
}
/**
This code gets the size of name of variable.
@param Variable Pointer to the Variable Header.
@return UINTN Size of variable in bytes.
**/
UINTN
NameSizeOfVariable (
IN VARIABLE_HEADER *Variable
)
{
AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
if (AuthVariable->State == (UINT8) (-1) ||
AuthVariable->DataSize == (UINT32) (-1) ||
AuthVariable->NameSize == (UINT32) (-1) ||
AuthVariable->Attributes == (UINT32) (-1)) {
return 0;
}
return (UINTN) AuthVariable->NameSize;
} else {
if (Variable->State == (UINT8) (-1) ||
Variable->DataSize == (UINT32) (-1) ||
Variable->NameSize == (UINT32) (-1) ||
Variable->Attributes == (UINT32) (-1)) {
return 0;
}
return (UINTN) Variable->NameSize;
}
}
/**
This code sets the size of name of variable.
@param[in] Variable Pointer to the Variable Header.
@param[in] NameSize Name size to set.
**/
VOID
SetNameSizeOfVariable (
IN VARIABLE_HEADER *Variable,
IN UINTN NameSize
)
{
AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
AuthVariable->NameSize = (UINT32) NameSize;
} else {
Variable->NameSize = (UINT32) NameSize;
}
}
/**
This code gets the size of variable data.
@param Variable Pointer to the Variable Header.
@return Size of variable in bytes.
**/
UINTN
DataSizeOfVariable (
IN VARIABLE_HEADER *Variable
)
{
AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
if (AuthVariable->State == (UINT8) (-1) ||
AuthVariable->DataSize == (UINT32) (-1) ||
AuthVariable->NameSize == (UINT32) (-1) ||
AuthVariable->Attributes == (UINT32) (-1)) {
return 0;
}
return (UINTN) AuthVariable->DataSize;
} else {
if (Variable->State == (UINT8) (-1) ||
Variable->DataSize == (UINT32) (-1) ||
Variable->NameSize == (UINT32) (-1) ||
Variable->Attributes == (UINT32) (-1)) {
return 0;
}
return (UINTN) Variable->DataSize;
}
}
/**
This code sets the size of variable data.
@param[in] Variable Pointer to the Variable Header.
@param[in] DataSize Data size to set.
**/
VOID
SetDataSizeOfVariable (
IN VARIABLE_HEADER *Variable,
IN UINTN DataSize
)
{
AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
AuthVariable->DataSize = (UINT32) DataSize;
} else {
Variable->DataSize = (UINT32) DataSize;
}
}
/**
This code gets the pointer to the variable name.
@param Variable Pointer to the Variable Header.
@return Pointer to Variable Name which is Unicode encoding.
**/
CHAR16 *
GetVariableNamePtr (
IN VARIABLE_HEADER *Variable
)
{
return (CHAR16 *) ((UINTN) Variable + GetVariableHeaderSize ());
}
/**
This code gets the pointer to the variable guid.
@param Variable Pointer to the Variable Header.
@return A EFI_GUID* pointer to Vendor Guid.
**/
EFI_GUID *
GetVendorGuidPtr (
IN VARIABLE_HEADER *Variable
)
{
AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
return &AuthVariable->VendorGuid;
} else {
return &Variable->VendorGuid;
}
}
/**
This code gets the pointer to the variable data.
@param Variable Pointer to the Variable Header.
@return Pointer to Variable Data.
**/
UINT8 *
GetVariableDataPtr (
IN VARIABLE_HEADER *Variable
)
{
UINTN Value;
//
// Be careful about pad size for alignment.
//
Value = (UINTN) GetVariableNamePtr (Variable);
Value += NameSizeOfVariable (Variable);
Value += GET_PAD_SIZE (NameSizeOfVariable (Variable));
return (UINT8 *) Value;
}
/**
This code gets the variable data offset related to variable header.
@param Variable Pointer to the Variable Header.
@return Variable Data offset.
**/
UINTN
GetVariableDataOffset (
IN VARIABLE_HEADER *Variable
)
{
UINTN Value;
//
// Be careful about pad size for alignment
//
Value = GetVariableHeaderSize ();
Value += NameSizeOfVariable (Variable);
Value += GET_PAD_SIZE (NameSizeOfVariable (Variable));
return Value;
}
/**
This code gets the pointer to the next variable header.
@param Variable Pointer to the Variable Header.
@return Pointer to next variable header.
**/
VARIABLE_HEADER *
GetNextVariablePtr (
IN VARIABLE_HEADER *Variable
)
{
UINTN Value;
Value = (UINTN) GetVariableDataPtr (Variable);
Value += DataSizeOfVariable (Variable);
Value += GET_PAD_SIZE (DataSizeOfVariable (Variable));
//
// Be careful about pad size for alignment.
//
return (VARIABLE_HEADER *) HEADER_ALIGN (Value);
}
/**
Gets the pointer to the first variable header in given variable store area.
@param VarStoreHeader Pointer to the Variable Store Header.
@return Pointer to the first variable header.
**/
VARIABLE_HEADER *
GetStartPointer (
IN VARIABLE_STORE_HEADER *VarStoreHeader
)
{
//
// The end of variable store.
//
return (VARIABLE_HEADER *) HEADER_ALIGN (VarStoreHeader + 1);
}
/**
Gets the pointer to the end of the variable storage area.
This function gets pointer to the end of the variable storage
area, according to the input variable store header.
@param VarStoreHeader Pointer to the Variable Store Header.
@return Pointer to the end of the variable storage area.
**/
VARIABLE_HEADER *
GetEndPointer (
IN VARIABLE_STORE_HEADER *VarStoreHeader
)
{
//
// The end of variable store
//
return (VARIABLE_HEADER *) HEADER_ALIGN ((UINTN) VarStoreHeader + VarStoreHeader->Size);
}
/**
Record variable error flag.
@param[in] Flag Variable error flag to record.
@param[in] VariableName Name of variable.
@param[in] VendorGuid Guid of variable.
@param[in] Attributes Attributes of the variable.
@param[in] VariableSize Size of the variable.
**/
VOID
RecordVarErrorFlag (
IN VAR_ERROR_FLAG Flag,
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes,
IN UINTN VariableSize
)
{
EFI_STATUS Status;
VARIABLE_POINTER_TRACK Variable;
VAR_ERROR_FLAG *VarErrFlag;
VAR_ERROR_FLAG TempFlag;
DEBUG_CODE (
DEBUG ((EFI_D_ERROR, "RecordVarErrorFlag (0x%02x) %s:%g - 0x%08x - 0x%x\n", Flag, VariableName, VendorGuid, Attributes, VariableSize));
if (Flag == VAR_ERROR_FLAG_SYSTEM_ERROR) {
if (AtRuntime ()) {
DEBUG ((EFI_D_ERROR, "CommonRuntimeVariableSpace = 0x%x - CommonVariableTotalSize = 0x%x\n", mVariableModuleGlobal->CommonRuntimeVariableSpace, mVariableModuleGlobal->CommonVariableTotalSize));
} else {
DEBUG ((EFI_D_ERROR, "CommonVariableSpace = 0x%x - CommonVariableTotalSize = 0x%x\n", mVariableModuleGlobal->CommonVariableSpace, mVariableModuleGlobal->CommonVariableTotalSize));
}
} else {
DEBUG ((EFI_D_ERROR, "CommonMaxUserVariableSpace = 0x%x - CommonUserVariableTotalSize = 0x%x\n", mVariableModuleGlobal->CommonMaxUserVariableSpace, mVariableModuleGlobal->CommonUserVariableTotalSize));
}
);
if (!mEndOfDxe) {
//
// Before EndOfDxe, just record the current boot variable error flag to local variable,
// and leave the variable error flag in NV flash as the last boot variable error flag.
// After EndOfDxe in InitializeVarErrorFlag (), the variable error flag in NV flash
// will be initialized to this local current boot variable error flag.
//
mCurrentBootVarErrFlag &= Flag;
return;
}
//
// Record error flag (it should have be initialized).
//
Status = FindVariable (
VAR_ERROR_FLAG_NAME,
&gEdkiiVarErrorFlagGuid,
&Variable,
&mVariableModuleGlobal->VariableGlobal,
FALSE
);
if (!EFI_ERROR (Status)) {
VarErrFlag = (VAR_ERROR_FLAG *) GetVariableDataPtr (Variable.CurrPtr);
TempFlag = *VarErrFlag;
TempFlag &= Flag;
if (TempFlag == *VarErrFlag) {
return;
}
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
FALSE,
FALSE,
mVariableModuleGlobal->FvbInstance,
(UINTN) VarErrFlag - (UINTN) mNvVariableCache + (UINTN) mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase,
sizeof (TempFlag),
&TempFlag
);
if (!EFI_ERROR (Status)) {
//
// Update the data in NV cache.
//
*VarErrFlag = TempFlag;
}
}
}
/**
Initialize variable error flag.
Before EndOfDxe, the variable indicates the last boot variable error flag,
then it means the last boot variable error flag must be got before EndOfDxe.
After EndOfDxe, the variable indicates the current boot variable error flag,
then it means the current boot variable error flag must be got after EndOfDxe.
**/
VOID
InitializeVarErrorFlag (
VOID
)
{
EFI_STATUS Status;
VARIABLE_POINTER_TRACK Variable;
VAR_ERROR_FLAG Flag;
VAR_ERROR_FLAG VarErrFlag;
if (!mEndOfDxe) {
return;
}
Flag = mCurrentBootVarErrFlag;
DEBUG ((EFI_D_INFO, "Initialize variable error flag (%02x)\n", Flag));
Status = FindVariable (
VAR_ERROR_FLAG_NAME,
&gEdkiiVarErrorFlagGuid,
&Variable,
&mVariableModuleGlobal->VariableGlobal,
FALSE
);
if (!EFI_ERROR (Status)) {
VarErrFlag = *((VAR_ERROR_FLAG *) GetVariableDataPtr (Variable.CurrPtr));
if (VarErrFlag == Flag) {
return;
}
}
UpdateVariable (
VAR_ERROR_FLAG_NAME,
&gEdkiiVarErrorFlagGuid,
&Flag,
sizeof (Flag),
VARIABLE_ATTRIBUTE_NV_BS_RT,
0,
0,
&Variable,
NULL
);
}
/**
Is user variable?
@param[in] Variable Pointer to variable header.
@retval TRUE User variable.
@retval FALSE System variable.
**/
BOOLEAN
IsUserVariable (
IN VARIABLE_HEADER *Variable
)
{
VAR_CHECK_VARIABLE_PROPERTY Property;
//
// Only after End Of Dxe, the variables belong to system variable are fixed.
// If PcdMaxUserNvStorageVariableSize is 0, it means user variable share the same NV storage with system variable,
// then no need to check if the variable is user variable or not specially.
//
if (mEndOfDxe && (mVariableModuleGlobal->CommonMaxUserVariableSpace != mVariableModuleGlobal->CommonVariableSpace)) {
if (VarCheckLibVariablePropertyGet (GetVariableNamePtr (Variable), GetVendorGuidPtr (Variable), &Property) == EFI_NOT_FOUND) {
return TRUE;
}
}
return FALSE;
}
/**
Calculate common user variable total size.
**/
VOID
CalculateCommonUserVariableTotalSize (
VOID
)
{
VARIABLE_HEADER *Variable;
VARIABLE_HEADER *NextVariable;
UINTN VariableSize;
VAR_CHECK_VARIABLE_PROPERTY Property;
//
// Only after End Of Dxe, the variables belong to system variable are fixed.
// If PcdMaxUserNvStorageVariableSize is 0, it means user variable share the same NV storage with system variable,
// then no need to calculate the common user variable total size specially.
//
if (mEndOfDxe && (mVariableModuleGlobal->CommonMaxUserVariableSpace != mVariableModuleGlobal->CommonVariableSpace)) {
Variable = GetStartPointer (mNvVariableCache);
while (IsValidVariableHeader (Variable, GetEndPointer (mNvVariableCache))) {
NextVariable = GetNextVariablePtr (Variable);
VariableSize = (UINTN) NextVariable - (UINTN) Variable;
if ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
if (VarCheckLibVariablePropertyGet (GetVariableNamePtr (Variable), GetVendorGuidPtr (Variable), &Property) == EFI_NOT_FOUND) {
//
// No property, it is user variable.
//
mVariableModuleGlobal->CommonUserVariableTotalSize += VariableSize;
}
}
Variable = NextVariable;
}
}
}
/**
Initialize variable quota.
**/
VOID
InitializeVariableQuota (
VOID
)
{
if (!mEndOfDxe) {
return;
}
InitializeVarErrorFlag ();
CalculateCommonUserVariableTotalSize ();
}
/**
Variable store garbage collection and reclaim operation.
@param[in] VariableBase Base address of variable store.
@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, out] UpdatingPtrTrack Pointer to updating variable pointer track structure.
@param[in] NewVariable Pointer to new variable.
@param[in] NewVariableSize New variable size.
@return EFI_SUCCESS Reclaim operation has finished successfully.
@return EFI_OUT_OF_RESOURCES No enough memory resources or variable space.
@return Others Unexpect error happened during reclaim operation.
**/
EFI_STATUS
Reclaim (
IN EFI_PHYSICAL_ADDRESS VariableBase,
OUT UINTN *LastVariableOffset,
IN BOOLEAN IsVolatile,
IN OUT VARIABLE_POINTER_TRACK *UpdatingPtrTrack,
IN VARIABLE_HEADER *NewVariable,
IN UINTN NewVariableSize
)
{
VARIABLE_HEADER *Variable;
VARIABLE_HEADER *AddedVariable;
VARIABLE_HEADER *NextVariable;
VARIABLE_HEADER *NextAddedVariable;
VARIABLE_STORE_HEADER *VariableStoreHeader;
UINT8 *ValidBuffer;
UINTN MaximumBufferSize;
UINTN VariableSize;
UINTN NameSize;
UINT8 *CurrPtr;
VOID *Point0;
VOID *Point1;
BOOLEAN FoundAdded;
EFI_STATUS Status;
UINTN CommonVariableTotalSize;
UINTN CommonUserVariableTotalSize;
UINTN HwErrVariableTotalSize;
VARIABLE_HEADER *UpdatingVariable;
VARIABLE_HEADER *UpdatingInDeletedTransition;
UpdatingVariable = NULL;
UpdatingInDeletedTransition = NULL;
if (UpdatingPtrTrack != NULL) {
UpdatingVariable = UpdatingPtrTrack->CurrPtr;
UpdatingInDeletedTransition = UpdatingPtrTrack->InDeletedTransitionPtr;
}
VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) VariableBase);
CommonVariableTotalSize = 0;
CommonUserVariableTotalSize = 0;
HwErrVariableTotalSize = 0;
if (IsVolatile) {
//
// Start Pointers for the variable.
//
Variable = GetStartPointer (VariableStoreHeader);
MaximumBufferSize = sizeof (VARIABLE_STORE_HEADER);
while (IsValidVariableHeader (Variable, GetEndPointer (VariableStoreHeader))) {
NextVariable = GetNextVariablePtr (Variable);
if ((Variable->State == VAR_ADDED || Variable->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) &&
Variable != UpdatingVariable &&
Variable != UpdatingInDeletedTransition
) {
VariableSize = (UINTN) NextVariable - (UINTN) Variable;
MaximumBufferSize += VariableSize;
}
Variable = NextVariable;
}
if (NewVariable != NULL) {
//
// Add the new variable size.
//
MaximumBufferSize += NewVariableSize;
}
//
// 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;
}
} else {
//
// For NV variable reclaim, don't allocate pool here and just use mNvVariableCache
// as the buffer to reduce SMRAM consumption for SMM variable driver.
//
MaximumBufferSize = mNvVariableCache->Size;
ValidBuffer = (UINT8 *) mNvVariableCache;
}
SetMem (ValidBuffer, MaximumBufferSize, 0xff);
//
// Copy variable store header.
//
CopyMem (ValidBuffer, VariableStoreHeader, sizeof (VARIABLE_STORE_HEADER));
CurrPtr = (UINT8 *) GetStartPointer ((VARIABLE_STORE_HEADER *) ValidBuffer);
//
// Reinstall all ADDED variables as long as they are not identical to Updating Variable.
//
Variable = GetStartPointer (VariableStoreHeader);
while (IsValidVariableHeader (Variable, GetEndPointer (VariableStoreHeader))) {
NextVariable = GetNextVariablePtr (Variable);
if (Variable != UpdatingVariable && Variable->State == VAR_ADDED) {
VariableSize = (UINTN) NextVariable - (UINTN) Variable;
CopyMem (CurrPtr, (UINT8 *) Variable, VariableSize);
CurrPtr += VariableSize;
if ((!IsVolatile) && ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
HwErrVariableTotalSize += VariableSize;
} else if ((!IsVolatile) && ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
CommonVariableTotalSize += VariableSize;
if (IsUserVariable (Variable)) {
CommonUserVariableTotalSize += VariableSize;
}
}
}
Variable = NextVariable;
}
//
// Reinstall all in delete transition variables.
//
Variable = GetStartPointer (VariableStoreHeader);
while (IsValidVariableHeader (Variable, GetEndPointer (VariableStoreHeader))) {
NextVariable = GetNextVariablePtr (Variable);
if (Variable != UpdatingVariable && Variable != UpdatingInDeletedTransition && Variable->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 ((VARIABLE_STORE_HEADER *) ValidBuffer);
while (IsValidVariableHeader (AddedVariable, GetEndPointer ((VARIABLE_STORE_HEADER *) ValidBuffer))) {
NextAddedVariable = GetNextVariablePtr (AddedVariable);
NameSize = NameSizeOfVariable (AddedVariable);
if (CompareGuid (GetVendorGuidPtr (AddedVariable), GetVendorGuidPtr (Variable)) &&
NameSize == NameSizeOfVariable (Variable)
) {
Point0 = (VOID *) GetVariableNamePtr (AddedVariable);
Point1 = (VOID *) GetVariableNamePtr (Variable);
if (CompareMem (Point0, Point1, NameSize) == 0) {
FoundAdded = TRUE;
break;
}
}
AddedVariable = NextAddedVariable;
}
if (!FoundAdded) {
//
// Promote VAR_IN_DELETED_TRANSITION to VAR_ADDED.
//
VariableSize = (UINTN) NextVariable - (UINTN) Variable;
CopyMem (CurrPtr, (UINT8 *) Variable, VariableSize);
((VARIABLE_HEADER *) CurrPtr)->State = VAR_ADDED;
CurrPtr += VariableSize;
if ((!IsVolatile) && ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
HwErrVariableTotalSize += VariableSize;
} else if ((!IsVolatile) && ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD)) {
CommonVariableTotalSize += VariableSize;
if (IsUserVariable (Variable)) {
CommonUserVariableTotalSize += VariableSize;
}
}
}
}
Variable = NextVariable;
}
//
// Install the new variable if it is not NULL.
//
if (NewVariable != NULL) {
if (((UINTN) CurrPtr - (UINTN) ValidBuffer) + NewVariableSize > VariableStoreHeader->Size) {
//
// No enough space to store the new variable.
//
Status = EFI_OUT_OF_RESOURCES;
goto Done;
}
if (!IsVolatile) {
if ((NewVariable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
HwErrVariableTotalSize += NewVariableSize;
} else if ((NewVariable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
CommonVariableTotalSize += NewVariableSize;
if (IsUserVariable (NewVariable)) {
CommonUserVariableTotalSize += NewVariableSize;
}
}
if ((HwErrVariableTotalSize > PcdGet32 (PcdHwErrStorageSize)) ||
(CommonVariableTotalSize > mVariableModuleGlobal->CommonVariableSpace) ||
(CommonUserVariableTotalSize > mVariableModuleGlobal->CommonMaxUserVariableSpace)) {
//
// No enough space to store the new variable by NV or NV+HR attribute.
//
Status = EFI_OUT_OF_RESOURCES;
goto Done;
}
}
CopyMem (CurrPtr, (UINT8 *) NewVariable, NewVariableSize);
((VARIABLE_HEADER *) CurrPtr)->State = VAR_ADDED;
if (UpdatingVariable != NULL) {
UpdatingPtrTrack->CurrPtr = (VARIABLE_HEADER *)((UINTN)UpdatingPtrTrack->StartPtr + ((UINTN)CurrPtr - (UINTN)GetStartPointer ((VARIABLE_STORE_HEADER *) ValidBuffer)));
UpdatingPtrTrack->InDeletedTransitionPtr = NULL;
}
CurrPtr += NewVariableSize;
}
if (IsVolatile) {
//
// If volatile variable store, just copy valid buffer.
//
SetMem ((UINT8 *) (UINTN) VariableBase, VariableStoreHeader->Size, 0xff);
CopyMem ((UINT8 *) (UINTN) VariableBase, ValidBuffer, (UINTN) CurrPtr - (UINTN) ValidBuffer);
*LastVariableOffset = (UINTN) CurrPtr - (UINTN) ValidBuffer;
Status = EFI_SUCCESS;
} else {
//
// If non-volatile variable store, perform FTW here.
//
Status = FtwVariableSpace (
VariableBase,
(VARIABLE_STORE_HEADER *) ValidBuffer
);
if (!EFI_ERROR (Status)) {
*LastVariableOffset = (UINTN) CurrPtr - (UINTN) ValidBuffer;
mVariableModuleGlobal->HwErrVariableTotalSize = HwErrVariableTotalSize;
mVariableModuleGlobal->CommonVariableTotalSize = CommonVariableTotalSize;
mVariableModuleGlobal->CommonUserVariableTotalSize = CommonUserVariableTotalSize;
} else {
mVariableModuleGlobal->HwErrVariableTotalSize = 0;
mVariableModuleGlobal->CommonVariableTotalSize = 0;
mVariableModuleGlobal->CommonUserVariableTotalSize = 0;
Variable = GetStartPointer ((VARIABLE_STORE_HEADER *)(UINTN)VariableBase);
while (IsValidVariableHeader (Variable, GetEndPointer ((VARIABLE_STORE_HEADER *)(UINTN)VariableBase))) {
NextVariable = GetNextVariablePtr (Variable);
VariableSize = (UINTN) NextVariable - (UINTN) Variable;
if ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
mVariableModuleGlobal->HwErrVariableTotalSize += VariableSize;
} else if ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
mVariableModuleGlobal->CommonVariableTotalSize += VariableSize;
if (IsUserVariable (Variable)) {
mVariableModuleGlobal->CommonUserVariableTotalSize += VariableSize;
}
}
Variable = NextVariable;
}
*LastVariableOffset = (UINTN) Variable - (UINTN) VariableBase;
}
}
Done:
if (IsVolatile) {
FreePool (ValidBuffer);
} else {
//
// For NV variable reclaim, we use mNvVariableCache as the buffer, so copy the data back.
//
CopyMem (mNvVariableCache, (UINT8 *)(UINTN)VariableBase, VariableStoreHeader->Size);
}
return Status;
}
/**
Find the variable in the specified variable store.
@param[in] VariableName Name of the variable to be found
@param[in] VendorGuid Vendor GUID to be found.
@param[in] IgnoreRtCheck Ignore EFI_VARIABLE_RUNTIME_ACCESS attribute
check at runtime when searching variable.
@param[in, out] PtrTrack Variable Track Pointer structure that contains Variable Information.
@retval EFI_SUCCESS Variable found successfully
@retval EFI_NOT_FOUND Variable not found
**/
EFI_STATUS
FindVariableEx (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN BOOLEAN IgnoreRtCheck,
IN OUT VARIABLE_POINTER_TRACK *PtrTrack
)
{
VARIABLE_HEADER *InDeletedVariable;
VOID *Point;
PtrTrack->InDeletedTransitionPtr = NULL;
//
// Find the variable by walk through HOB, volatile and non-volatile variable store.
//
InDeletedVariable = NULL;
for ( PtrTrack->CurrPtr = PtrTrack->StartPtr
; IsValidVariableHeader (PtrTrack->CurrPtr, PtrTrack->EndPtr)
; PtrTrack->CurrPtr = GetNextVariablePtr (PtrTrack->CurrPtr)
) {
if (PtrTrack->CurrPtr->State == VAR_ADDED ||
PtrTrack->CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)
) {
if (IgnoreRtCheck || !AtRuntime () || ((PtrTrack->CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) != 0)) {
if (VariableName[0] == 0) {
if (PtrTrack->CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
InDeletedVariable = PtrTrack->CurrPtr;
} else {
PtrTrack->InDeletedTransitionPtr = InDeletedVariable;
return EFI_SUCCESS;
}
} else {
if (CompareGuid (VendorGuid, GetVendorGuidPtr (PtrTrack->CurrPtr))) {
Point = (VOID *) GetVariableNamePtr (PtrTrack->CurrPtr);
ASSERT (NameSizeOfVariable (PtrTrack->CurrPtr) != 0);
if (CompareMem (VariableName, Point, NameSizeOfVariable (PtrTrack->CurrPtr)) == 0) {
if (PtrTrack->CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
InDeletedVariable = PtrTrack->CurrPtr;
} else {
PtrTrack->InDeletedTransitionPtr = InDeletedVariable;
return EFI_SUCCESS;
}
}
}
}
}
}
}
PtrTrack->CurrPtr = InDeletedVariable;
return (PtrTrack->CurrPtr == NULL) ? EFI_NOT_FOUND : EFI_SUCCESS;
}
/**
Finds variable in storage blocks of volatile and non-volatile storage areas.
This code finds variable in storage blocks of 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.
If IgnoreRtCheck is TRUE, then we ignore the EFI_VARIABLE_RUNTIME_ACCESS attribute check
at runtime when searching existing variable, only VariableName and VendorGuid are compared.
Otherwise, variables without EFI_VARIABLE_RUNTIME_ACCESS are not visible at runtime.
@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] IgnoreRtCheck Ignore EFI_VARIABLE_RUNTIME_ACCESS attribute
check at runtime when searching variable.
@retval EFI_INVALID_PARAMETER If VariableName is not an empty string, while
VendorGuid is NULL.
@retval EFI_SUCCESS Variable successfully found.
@retval EFI_NOT_FOUND Variable not found
**/
EFI_STATUS
FindVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT VARIABLE_POINTER_TRACK *PtrTrack,
IN VARIABLE_GLOBAL *Global,
IN BOOLEAN IgnoreRtCheck
)
{
EFI_STATUS Status;
VARIABLE_STORE_HEADER *VariableStoreHeader[VariableStoreTypeMax];
VARIABLE_STORE_TYPE Type;
if (VariableName[0] != 0 && VendorGuid == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// 0: Volatile, 1: HOB, 2: Non-Volatile.
// The index and attributes mapping must be kept in this order as RuntimeServiceGetNextVariableName
// make use of this mapping to implement search algorithm.
//
VariableStoreHeader[VariableStoreTypeVolatile] = (VARIABLE_STORE_HEADER *) (UINTN) Global->VolatileVariableBase;
VariableStoreHeader[VariableStoreTypeHob] = (VARIABLE_STORE_HEADER *) (UINTN) Global->HobVariableBase;
VariableStoreHeader[VariableStoreTypeNv] = mNvVariableCache;
//
// Find the variable by walk through HOB, volatile and non-volatile variable store.
//
for (Type = (VARIABLE_STORE_TYPE) 0; Type < VariableStoreTypeMax; Type++) {
if (VariableStoreHeader[Type] == NULL) {
continue;
}
PtrTrack->StartPtr = GetStartPointer (VariableStoreHeader[Type]);
PtrTrack->EndPtr = GetEndPointer (VariableStoreHeader[Type]);
PtrTrack->Volatile = (BOOLEAN) (Type == VariableStoreTypeVolatile);
Status = FindVariableEx (VariableName, VendorGuid, IgnoreRtCheck, PtrTrack);
if (!EFI_ERROR (Status)) {
return Status;
}
}
return EFI_NOT_FOUND;
}
/**
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 SupportedLang Platform supported language codes.
@param Lang Configured language.
@param Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646.
@retval 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 strings 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 SupportedLang Platform supported language codes.
@param Index The index in supported language codes.
@param Iso639Language A bool value to signify if the handler is operated on ISO639 or RFC4646.
@retval The language string in the language codes.
**/
CHAR8 *
GetLangFromSupportedLangCodes (
IN CHAR8 *SupportedLang,
IN UINTN Index,
IN BOOLEAN Iso639Language
)
{
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.
// This code will be invoked in RUNTIME, therefore there is not a memory allocate/free operation.
// In driver entry, it pre-allocates a runtime attribute memory to accommodate this string.
//
CompareLength = ISO_639_2_ENTRY_SIZE;
mVariableModuleGlobal->Lang[CompareLength] = '\0';
return CopyMem (mVariableModuleGlobal->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.
//
mVariableModuleGlobal->PlatformLang[CompareLength] = '\0';
return CopyMem (mVariableModuleGlobal->PlatformLang, 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] ... 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 *
EFIAPI
VariableGetBestLanguage (
IN CONST CHAR8 *SupportedLanguages,
IN BOOLEAN Iso639Language,
...
)
{
VA_LIST Args;
CHAR8 *Language;
UINTN CompareLength;
UINTN LanguageLength;
CONST CHAR8 *Supported;
CHAR8 *Buffer;
if (SupportedLanguages == NULL) {
return NULL;
}
VA_START (Args, Iso639Language);
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;
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;
}
/**
This function is to check if the remaining variable space is enough to set
all Variables from argument list successfully. The purpose of the check
is to keep the consistency of the Variables to be in variable storage.
Note: Variables are assumed to be in same storage.
The set sequence of Variables will be same with the sequence of VariableEntry from argument list,
so follow the argument sequence to check the Variables.
@param[in] Attributes Variable attributes for Variable entries.
@param[in] Marker VA_LIST style variable argument list.
The variable argument list with type VARIABLE_ENTRY_CONSISTENCY *.
A NULL terminates the list. The VariableSize of
VARIABLE_ENTRY_CONSISTENCY is the variable data size as input.
It will be changed to variable total size as output.
@retval TRUE Have enough variable space to set the Variables successfully.
@retval FALSE No enough variable space to set the Variables successfully.
**/
BOOLEAN
EFIAPI
CheckRemainingSpaceForConsistencyInternal (
IN UINT32 Attributes,
IN VA_LIST Marker
)
{
EFI_STATUS Status;
VA_LIST Args;
VARIABLE_ENTRY_CONSISTENCY *VariableEntry;
UINT64 MaximumVariableStorageSize;
UINT64 RemainingVariableStorageSize;
UINT64 MaximumVariableSize;
UINTN TotalNeededSize;
UINTN OriginalVarSize;
VARIABLE_STORE_HEADER *VariableStoreHeader;
VARIABLE_POINTER_TRACK VariablePtrTrack;
VARIABLE_HEADER *NextVariable;
UINTN VarNameSize;
UINTN VarDataSize;
//
// Non-Volatile related.
//
VariableStoreHeader = mNvVariableCache;
Status = VariableServiceQueryVariableInfoInternal (
Attributes,
&MaximumVariableStorageSize,
&RemainingVariableStorageSize,
&MaximumVariableSize
);
ASSERT_EFI_ERROR (Status);
TotalNeededSize = 0;
VA_COPY (Args, Marker);
VariableEntry = VA_ARG (Args, VARIABLE_ENTRY_CONSISTENCY *);
while (VariableEntry != NULL) {
//
// Calculate variable total size.
//
VarNameSize = StrSize (VariableEntry->Name);
VarNameSize += GET_PAD_SIZE (VarNameSize);
VarDataSize = VariableEntry->VariableSize;
VarDataSize += GET_PAD_SIZE (VarDataSize);
VariableEntry->VariableSize = HEADER_ALIGN (GetVariableHeaderSize () + VarNameSize + VarDataSize);
TotalNeededSize += VariableEntry->VariableSize;
VariableEntry = VA_ARG (Args, VARIABLE_ENTRY_CONSISTENCY *);
}
VA_END (Args);
if (RemainingVariableStorageSize >= TotalNeededSize) {
//
// Already have enough space.
//
return TRUE;
} else if (AtRuntime ()) {
//
// At runtime, no reclaim.
// The original variable space of Variables can't be reused.
//
return FALSE;
}
VA_COPY (Args, Marker);
VariableEntry = VA_ARG (Args, VARIABLE_ENTRY_CONSISTENCY *);
while (VariableEntry != NULL) {
//
// Check if Variable[Index] has been present and get its size.
//
OriginalVarSize = 0;
VariablePtrTrack.StartPtr = GetStartPointer (VariableStoreHeader);
VariablePtrTrack.EndPtr = GetEndPointer (VariableStoreHeader);
Status = FindVariableEx (
VariableEntry->Name,
VariableEntry->Guid,
FALSE,
&VariablePtrTrack
);
if (!EFI_ERROR (Status)) {
//
// Get size of Variable[Index].
//
NextVariable = GetNextVariablePtr (VariablePtrTrack.CurrPtr);
OriginalVarSize = (UINTN) NextVariable - (UINTN) VariablePtrTrack.CurrPtr;
//
// Add the original size of Variable[Index] to remaining variable storage size.
//
RemainingVariableStorageSize += OriginalVarSize;
}
if (VariableEntry->VariableSize > RemainingVariableStorageSize) {
//
// No enough space for Variable[Index].
//
VA_END (Args);
return FALSE;
}
//
// Sub the (new) size of Variable[Index] from remaining variable storage size.
//
RemainingVariableStorageSize -= VariableEntry->VariableSize;
VariableEntry = VA_ARG (Args, VARIABLE_ENTRY_CONSISTENCY *);
}
VA_END (Args);
return TRUE;
}
/**
This function is to check if the remaining variable space is enough to set
all Variables from argument list successfully. The purpose of the check
is to keep the consistency of the Variables to be in variable storage.
Note: Variables are assumed to be in same storage.
The set sequence of Variables will be same with the sequence of VariableEntry from argument list,
so follow the argument sequence to check the Variables.
@param[in] Attributes Variable attributes for Variable entries.
@param ... The variable argument list with type VARIABLE_ENTRY_CONSISTENCY *.
A NULL terminates the list. The VariableSize of
VARIABLE_ENTRY_CONSISTENCY is the variable data size as input.
It will be changed to variable total size as output.
@retval TRUE Have enough variable space to set the Variables successfully.
@retval FALSE No enough variable space to set the Variables successfully.
**/
BOOLEAN
EFIAPI
CheckRemainingSpaceForConsistency (
IN UINT32 Attributes,
...
)
{
VA_LIST Marker;
BOOLEAN Return;
VA_START (Marker, Attributes);
Return = CheckRemainingSpaceForConsistencyInternal (Attributes, Marker);
VA_END (Marker);
return Return;
}
/**
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.
@retval EFI_SUCCESS The update operation is successful or ignored.
@retval EFI_WRITE_PROTECTED Update PlatformLangCodes/LangCodes at runtime.
@retval EFI_OUT_OF_RESOURCES No enough variable space to do the update operation.
@retval Others Other errors happened during the update operation.
**/
EFI_STATUS
AutoUpdateLangVariable (
IN CHAR16 *VariableName,
IN VOID *Data,
IN UINTN DataSize
)
{
EFI_STATUS Status;
CHAR8 *BestPlatformLang;
CHAR8 *BestLang;
UINTN Index;
UINT32 Attributes;
VARIABLE_POINTER_TRACK Variable;
BOOLEAN SetLanguageCodes;
VARIABLE_ENTRY_CONSISTENCY VariableEntry[2];
//
// Don't do updates for delete operation
//
if (DataSize == 0) {
return EFI_SUCCESS;
}
SetLanguageCodes = FALSE;
if (StrCmp (VariableName, EFI_PLATFORM_LANG_CODES_VARIABLE_NAME) == 0) {
//
// PlatformLangCodes is a volatile variable, so it can not be updated at runtime.
//
if (AtRuntime ()) {
return EFI_WRITE_PROTECTED;
}
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 (mVariableModuleGlobal->PlatformLangCodes != NULL) {
FreePool (mVariableModuleGlobal->PlatformLangCodes);
}
mVariableModuleGlobal->PlatformLangCodes = AllocateRuntimeCopyPool (DataSize, Data);
ASSERT (mVariableModuleGlobal->PlatformLangCodes != NULL);
//
// PlatformLang holds a single language from PlatformLangCodes,
// so the size of PlatformLangCodes is enough for the PlatformLang.
//
if (mVariableModuleGlobal->PlatformLang != NULL) {
FreePool (mVariableModuleGlobal->PlatformLang);
}
mVariableModuleGlobal->PlatformLang = AllocateRuntimePool (DataSize);
ASSERT (mVariableModuleGlobal->PlatformLang != NULL);
} else if (StrCmp (VariableName, EFI_LANG_CODES_VARIABLE_NAME) == 0) {
//
// LangCodes is a volatile variable, so it can not be updated at runtime.
//
if (AtRuntime ()) {
return EFI_WRITE_PROTECTED;
}
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 (mVariableModuleGlobal->LangCodes != NULL) {
FreePool (mVariableModuleGlobal->LangCodes);
}
mVariableModuleGlobal->LangCodes = AllocateRuntimeCopyPool (DataSize, Data);
ASSERT (mVariableModuleGlobal->LangCodes != NULL);
}
if (SetLanguageCodes
&& (mVariableModuleGlobal->PlatformLangCodes != NULL)
&& (mVariableModuleGlobal->LangCodes != NULL)) {
//
// Update Lang if PlatformLang is already set
// Update PlatformLang if Lang is already set
//
Status = FindVariable (EFI_PLATFORM_LANG_VARIABLE_NAME, &gEfiGlobalVariableGuid, &Variable, &mVariableModuleGlobal->VariableGlobal, FALSE);
if (!EFI_ERROR (Status)) {
//
// Update Lang
//
VariableName = EFI_PLATFORM_LANG_VARIABLE_NAME;
Data = GetVariableDataPtr (Variable.CurrPtr);
DataSize = DataSizeOfVariable (Variable.CurrPtr);
} else {
Status = FindVariable (EFI_LANG_VARIABLE_NAME, &gEfiGlobalVariableGuid, &Variable, &mVariableModuleGlobal->VariableGlobal, FALSE);
if (!EFI_ERROR (Status)) {
//
// Update PlatformLang
//
VariableName = EFI_LANG_VARIABLE_NAME;
Data = GetVariableDataPtr (Variable.CurrPtr);
DataSize = DataSizeOfVariable (Variable.CurrPtr);
} else {
//
// Neither PlatformLang nor Lang is set, directly return
//
return EFI_SUCCESS;
}
}
}
Status = EFI_SUCCESS;
//
// 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, EFI_PLATFORM_LANG_VARIABLE_NAME) == 0) {
//
// Update Lang when PlatformLangCodes/LangCodes were set.
//
if ((mVariableModuleGlobal->PlatformLangCodes != NULL) && (mVariableModuleGlobal->LangCodes != NULL)) {
//
// When setting PlatformLang, firstly get most matched language string from supported language codes.
//
BestPlatformLang = VariableGetBestLanguage (mVariableModuleGlobal->PlatformLangCodes, FALSE, Data, NULL);
if (BestPlatformLang != NULL) {
//
// Get the corresponding index in language codes.
//
Index = GetIndexFromSupportedLangCodes (mVariableModuleGlobal->PlatformLangCodes, BestPlatformLang, FALSE);
//
// Get the corresponding ISO639 language tag according to RFC4646 language tag.
//
BestLang = GetLangFromSupportedLangCodes (mVariableModuleGlobal->LangCodes, Index, TRUE);
//
// Check the variable space for both Lang and PlatformLang variable.
//
VariableEntry[0].VariableSize = ISO_639_2_ENTRY_SIZE + 1;
VariableEntry[0].Guid = &gEfiGlobalVariableGuid;
VariableEntry[0].Name = EFI_LANG_VARIABLE_NAME;
VariableEntry[1].VariableSize = AsciiStrSize (BestPlatformLang);
VariableEntry[1].Guid = &gEfiGlobalVariableGuid;
VariableEntry[1].Name = EFI_PLATFORM_LANG_VARIABLE_NAME;
if (!CheckRemainingSpaceForConsistency (VARIABLE_ATTRIBUTE_NV_BS_RT, &VariableEntry[0], &VariableEntry[1], NULL)) {
//
// No enough variable space to set both Lang and PlatformLang successfully.
//
Status = EFI_OUT_OF_RESOURCES;
} else {
//
// Successfully convert PlatformLang to Lang, and set the BestLang value into Lang variable simultaneously.
//
FindVariable (EFI_LANG_VARIABLE_NAME, &gEfiGlobalVariableGuid, &Variable, &mVariableModuleGlobal->VariableGlobal, FALSE);
Status = UpdateVariable (EFI_LANG_VARIABLE_NAME, &gEfiGlobalVariableGuid, BestLang,
ISO_639_2_ENTRY_SIZE + 1, Attributes, 0, 0, &Variable, NULL);
}
DEBUG ((EFI_D_INFO, "Variable Driver Auto Update PlatformLang, PlatformLang:%a, Lang:%a Status: %r\n", BestPlatformLang, BestLang, Status));
}
}
} else if (StrCmp (VariableName, EFI_LANG_VARIABLE_NAME) == 0) {
//
// Update PlatformLang when PlatformLangCodes/LangCodes were set.
//
if ((mVariableModuleGlobal->PlatformLangCodes != NULL) && (mVariableModuleGlobal->LangCodes != NULL)) {
//
// When setting Lang, firstly get most matched language string from supported language codes.
//
BestLang = VariableGetBestLanguage (mVariableModuleGlobal->LangCodes, TRUE, Data, NULL);
if (BestLang != NULL) {
//
// Get the corresponding index in language codes.
//
Index = GetIndexFromSupportedLangCodes (mVariableModuleGlobal->LangCodes, BestLang, TRUE);
//
// Get the corresponding RFC4646 language tag according to ISO639 language tag.
//
BestPlatformLang = GetLangFromSupportedLangCodes (mVariableModuleGlobal->PlatformLangCodes, Index, FALSE);
//
// Check the variable space for both PlatformLang and Lang variable.
//
VariableEntry[0].VariableSize = AsciiStrSize (BestPlatformLang);
VariableEntry[0].Guid = &gEfiGlobalVariableGuid;
VariableEntry[0].Name = EFI_PLATFORM_LANG_VARIABLE_NAME;
VariableEntry[1].VariableSize = ISO_639_2_ENTRY_SIZE + 1;
VariableEntry[1].Guid = &gEfiGlobalVariableGuid;
VariableEntry[1].Name = EFI_LANG_VARIABLE_NAME;
if (!CheckRemainingSpaceForConsistency (VARIABLE_ATTRIBUTE_NV_BS_RT, &VariableEntry[0], &VariableEntry[1], NULL)) {
//
// No enough variable space to set both PlatformLang and Lang successfully.
//
Status = EFI_OUT_OF_RESOURCES;
} else {
//
// Successfully convert Lang to PlatformLang, and set the BestPlatformLang value into PlatformLang variable simultaneously.
//
FindVariable (EFI_PLATFORM_LANG_VARIABLE_NAME, &gEfiGlobalVariableGuid, &Variable, &mVariableModuleGlobal->VariableGlobal, FALSE);
Status = UpdateVariable (EFI_PLATFORM_LANG_VARIABLE_NAME, &gEfiGlobalVariableGuid, BestPlatformLang,
AsciiStrSize (BestPlatformLang), Attributes, 0, 0, &Variable, NULL);
}
DEBUG ((EFI_D_INFO, "Variable Driver Auto Update Lang, Lang:%a, PlatformLang:%a Status: %r\n", BestLang, BestPlatformLang, Status));
}
}
}
if (SetLanguageCodes) {
//
// Continue to set PlatformLangCodes or LangCodes.
//
return EFI_SUCCESS;
} else {
return Status;
}
}
/**
Compare two EFI_TIME data.
@param FirstTime A pointer to the first EFI_TIME data.
@param SecondTime A pointer to the second EFI_TIME data.
@retval TRUE The FirstTime is not later than the SecondTime.
@retval FALSE The FirstTime is later than the SecondTime.
**/
BOOLEAN
VariableCompareTimeStampInternal (
IN EFI_TIME *FirstTime,
IN EFI_TIME *SecondTime
)
{
if (FirstTime->Year != SecondTime->Year) {
return (BOOLEAN) (FirstTime->Year < SecondTime->Year);
} else if (FirstTime->Month != SecondTime->Month) {
return (BOOLEAN) (FirstTime->Month < SecondTime->Month);
} else if (FirstTime->Day != SecondTime->Day) {
return (BOOLEAN) (FirstTime->Day < SecondTime->Day);
} else if (FirstTime->Hour != SecondTime->Hour) {
return (BOOLEAN) (FirstTime->Hour < SecondTime->Hour);
} else if (FirstTime->Minute != SecondTime->Minute) {
return (BOOLEAN) (FirstTime->Minute < SecondTime->Minute);
}
return (BOOLEAN) (FirstTime->Second <= SecondTime->Second);
}
/**
Update the variable region with Variable information. If EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS is set,
index of associated public key is needed.
@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, out] CacheVariable The variable information which is used to keep track of variable usage.
@param[in] TimeStamp Value of associated TimeStamp.
@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
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 OUT VARIABLE_POINTER_TRACK *CacheVariable,
IN EFI_TIME *TimeStamp OPTIONAL
)
{
EFI_STATUS Status;
VARIABLE_HEADER *NextVariable;
UINTN ScratchSize;
UINTN MaxDataSize;
UINTN VarNameOffset;
UINTN VarDataOffset;
UINTN VarNameSize;
UINTN VarSize;
BOOLEAN Volatile;
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
UINT8 State;
VARIABLE_POINTER_TRACK *Variable;
VARIABLE_POINTER_TRACK NvVariable;
VARIABLE_STORE_HEADER *VariableStoreHeader;
UINTN CacheOffset;
UINT8 *BufferForMerge;
UINTN MergedBufSize;
BOOLEAN DataReady;
UINTN DataOffset;
BOOLEAN IsCommonVariable;
BOOLEAN IsCommonUserVariable;
AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
if (mVariableModuleGlobal->FvbInstance == NULL) {
//
// The FVB protocol is not ready, so the EFI_VARIABLE_WRITE_ARCH_PROTOCOL is not installed.
//
if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
//
// Trying to update NV variable prior to the installation of EFI_VARIABLE_WRITE_ARCH_PROTOCOL
//
DEBUG ((EFI_D_ERROR, "Update NV variable before EFI_VARIABLE_WRITE_ARCH_PROTOCOL ready - %r\n", EFI_NOT_AVAILABLE_YET));
return EFI_NOT_AVAILABLE_YET;
} else if ((Attributes & VARIABLE_ATTRIBUTE_AT_AW) != 0) {
//
// Trying to update volatile authenticated variable prior to the installation of EFI_VARIABLE_WRITE_ARCH_PROTOCOL
// The authenticated variable perhaps is not initialized, just return here.
//
DEBUG ((EFI_D_ERROR, "Update AUTH variable before EFI_VARIABLE_WRITE_ARCH_PROTOCOL ready - %r\n", EFI_NOT_AVAILABLE_YET));
return EFI_NOT_AVAILABLE_YET;
}
}
//
// Check if CacheVariable points to the variable in variable HOB.
// If yes, let CacheVariable points to the variable in NV variable cache.
//
if ((CacheVariable->CurrPtr != NULL) &&
(mVariableModuleGlobal->VariableGlobal.HobVariableBase != 0) &&
(CacheVariable->StartPtr == GetStartPointer ((VARIABLE_STORE_HEADER *) (UINTN) mVariableModuleGlobal->VariableGlobal.HobVariableBase))
) {
CacheVariable->StartPtr = GetStartPointer (mNvVariableCache);
CacheVariable->EndPtr = GetEndPointer (mNvVariableCache);
CacheVariable->Volatile = FALSE;
Status = FindVariableEx (VariableName, VendorGuid, FALSE, CacheVariable);
if (CacheVariable->CurrPtr == NULL || EFI_ERROR (Status)) {
//
// There is no matched variable in NV variable cache.
//
if ((((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) && (DataSize == 0)) || (Attributes == 0)) {
//
// It is to delete variable,
// go to delete this variable in variable HOB and
// try to flush other variables from HOB to flash.
//
UpdateVariableInfo (VariableName, VendorGuid, FALSE, FALSE, FALSE, TRUE, FALSE);
FlushHobVariableToFlash (VariableName, VendorGuid);
return EFI_SUCCESS;
}
}
}
if ((CacheVariable->CurrPtr == NULL) || CacheVariable->Volatile) {
Variable = CacheVariable;
} else {
//
// Update/Delete existing NV variable.
// CacheVariable points to the variable in the memory copy of Flash area
// Now let Variable points to the same variable in Flash area.
//
VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase);
Variable = &NvVariable;
Variable->StartPtr = GetStartPointer (VariableStoreHeader);
Variable->EndPtr = (VARIABLE_HEADER *)((UINTN)Variable->StartPtr + ((UINTN)CacheVariable->EndPtr - (UINTN)CacheVariable->StartPtr));
Variable->CurrPtr = (VARIABLE_HEADER *)((UINTN)Variable->StartPtr + ((UINTN)CacheVariable->CurrPtr - (UINTN)CacheVariable->StartPtr));
if (CacheVariable->InDeletedTransitionPtr != NULL) {
Variable->InDeletedTransitionPtr = (VARIABLE_HEADER *)((UINTN)Variable->StartPtr + ((UINTN)CacheVariable->InDeletedTransitionPtr - (UINTN)CacheVariable->StartPtr));
} else {
Variable->InDeletedTransitionPtr = NULL;
}
Variable->Volatile = FALSE;
}
Fvb = mVariableModuleGlobal->FvbInstance;
//
// Tricky part: Use scratch data area at the end of volatile variable store
// as a temporary storage.
//
NextVariable = GetEndPointer ((VARIABLE_STORE_HEADER *) ((UINTN) mVariableModuleGlobal->VariableGlobal.VolatileVariableBase));
ScratchSize = mVariableModuleGlobal->ScratchBufferSize;
SetMem (NextVariable, ScratchSize, 0xff);
DataReady = FALSE;
if (Variable->CurrPtr != NULL) {
//
// Update/Delete existing variable.
//
if (AtRuntime ()) {
//
// If AtRuntime 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 that have NV attributes can be updated/deleted in Runtime.
//
if ((CacheVariable->CurrPtr->Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
Status = EFI_INVALID_PARAMETER;
goto Done;
}
//
// Only variable that have RT attributes can be updated/deleted in Runtime.
//
if ((CacheVariable->CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0) {
Status = EFI_INVALID_PARAMETER;
goto Done;
}
}
//
// Setting a data variable with no access, or zero DataSize attributes
// causes it to be deleted.
// When the EFI_VARIABLE_APPEND_WRITE attribute is set, DataSize of zero will
// not delete the variable.
//
if ((((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) && (DataSize == 0))|| ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0)) {
if (Variable->InDeletedTransitionPtr != NULL) {
//
// Both ADDED and IN_DELETED_TRANSITION variable are present,
// set IN_DELETED_TRANSITION one to DELETED state first.
//
ASSERT (CacheVariable->InDeletedTransitionPtr != NULL);
State = CacheVariable->InDeletedTransitionPtr->State;
State &= VAR_DELETED;
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
Variable->Volatile,
FALSE,
Fvb,
(UINTN) &Variable->InDeletedTransitionPtr->State,
sizeof (UINT8),
&State
);
if (!EFI_ERROR (Status)) {
if (!Variable->Volatile) {
CacheVariable->InDeletedTransitionPtr->State = State;
}
} else {
goto Done;
}
}
State = CacheVariable->CurrPtr->State;
State &= VAR_DELETED;
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
Variable->Volatile,
FALSE,
Fvb,
(UINTN) &Variable->CurrPtr->State,
sizeof (UINT8),
&State
);
if (!EFI_ERROR (Status)) {
UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, FALSE, TRUE, FALSE);
if (!Variable->Volatile) {
CacheVariable->CurrPtr->State = State;
FlushHobVariableToFlash (VariableName, VendorGuid);
}
}
goto Done;
}
//
// If the variable is marked valid, and the same data has been passed in,
// then return to the caller immediately.
//
if (DataSizeOfVariable (CacheVariable->CurrPtr) == DataSize &&
(CompareMem (Data, GetVariableDataPtr (CacheVariable->CurrPtr), DataSize) == 0) &&
((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) &&
(TimeStamp == NULL)) {
//
// Variable content unchanged and no need to update timestamp, just return.
//
UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, TRUE, FALSE, FALSE);
Status = EFI_SUCCESS;
goto Done;
} else if ((CacheVariable->CurrPtr->State == VAR_ADDED) ||
(CacheVariable->CurrPtr->State == (VAR_ADDED & VAR_IN_DELETED_TRANSITION))) {
//
// EFI_VARIABLE_APPEND_WRITE attribute only effects for existing variable.
//
if ((Attributes & EFI_VARIABLE_APPEND_WRITE) != 0) {
//
// NOTE: From 0 to DataOffset of NextVariable is reserved for Variable Header and Name.
// From DataOffset of NextVariable is to save the existing variable data.
//
DataOffset = GetVariableDataOffset (CacheVariable->CurrPtr);
BufferForMerge = (UINT8 *) ((UINTN) NextVariable + DataOffset);
CopyMem (BufferForMerge, (UINT8 *) ((UINTN) CacheVariable->CurrPtr + DataOffset), DataSizeOfVariable (CacheVariable->CurrPtr));
//
// Set Max Common/Auth Variable Data Size as default MaxDataSize.
//
if ((Attributes & VARIABLE_ATTRIBUTE_AT_AW) != 0) {
MaxDataSize = mVariableModuleGlobal->MaxAuthVariableSize - DataOffset;
} else {
MaxDataSize = mVariableModuleGlobal->MaxVariableSize - DataOffset;
}
//
// Append the new data to the end of existing data.
// Max Harware error record variable data size is different from common/auth variable.
//
if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
MaxDataSize = PcdGet32 (PcdMaxHardwareErrorVariableSize) - DataOffset;
}
if (DataSizeOfVariable (CacheVariable->CurrPtr) + DataSize > MaxDataSize) {
//
// Existing data size + new data size exceed maximum variable size limitation.
//
Status = EFI_INVALID_PARAMETER;
goto Done;
}
CopyMem ((UINT8*) ((UINTN) BufferForMerge + DataSizeOfVariable (CacheVariable->CurrPtr)), Data, DataSize);
MergedBufSize = DataSizeOfVariable (CacheVariable->CurrPtr) + DataSize;
//
// BufferForMerge(from DataOffset of NextVariable) has included the merged existing and new data.
//
Data = BufferForMerge;
DataSize = MergedBufSize;
DataReady = TRUE;
}
//
// Mark the old variable as in delete transition.
//
State = CacheVariable->CurrPtr->State;
State &= VAR_IN_DELETED_TRANSITION;
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
Variable->Volatile,
FALSE,
Fvb,
(UINTN) &Variable->CurrPtr->State,
sizeof (UINT8),
&State
);
if (EFI_ERROR (Status)) {
goto Done;
}
if (!Variable->Volatile) {
CacheVariable->CurrPtr->State = State;
}
}
} else {
//
// Not found existing variable. Create a new variable.
//
if ((DataSize == 0) && ((Attributes & EFI_VARIABLE_APPEND_WRITE) != 0)) {
Status = EFI_SUCCESS;
goto Done;
}
//
// Make sure we are trying to create a new variable.
// Setting a data variable with zero DataSize or no access 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 (AtRuntime () &&
(((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.
//
NextVariable->StartId = VARIABLE_DATA;
//
// NextVariable->State = VAR_ADDED;
//
NextVariable->Reserved = 0;
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) NextVariable;
AuthVariable->PubKeyIndex = KeyIndex;
AuthVariable->MonotonicCount = MonotonicCount;
ZeroMem (&AuthVariable->TimeStamp, sizeof (EFI_TIME));
if (((Attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) != 0) &&
(TimeStamp != NULL)) {
if ((Attributes & EFI_VARIABLE_APPEND_WRITE) == 0) {
CopyMem (&AuthVariable->TimeStamp, TimeStamp, sizeof (EFI_TIME));
} else {
//
// In the case when the EFI_VARIABLE_APPEND_WRITE attribute is set, only
// when the new TimeStamp value is later than the current timestamp associated
// with the variable, we need associate the new timestamp with the updated value.
//
if (Variable->CurrPtr != NULL) {
if (VariableCompareTimeStampInternal (&(((AUTHENTICATED_VARIABLE_HEADER *) CacheVariable->CurrPtr)->TimeStamp), TimeStamp)) {
CopyMem (&AuthVariable->TimeStamp, TimeStamp, sizeof (EFI_TIME));
}
}
}
}
}
//
// The EFI_VARIABLE_APPEND_WRITE attribute will never be set in the returned
// Attributes bitmask parameter of a GetVariable() call.
//
NextVariable->Attributes = Attributes & (~EFI_VARIABLE_APPEND_WRITE);
VarNameOffset = GetVariableHeaderSize ();
VarNameSize = StrSize (VariableName);
CopyMem (
(UINT8 *) ((UINTN) NextVariable + VarNameOffset),
VariableName,
VarNameSize
);
VarDataOffset = VarNameOffset + VarNameSize + GET_PAD_SIZE (VarNameSize);
//
// If DataReady is TRUE, it means the variable data has been saved into
// NextVariable during EFI_VARIABLE_APPEND_WRITE operation preparation.
//
if (!DataReady) {
CopyMem (
(UINT8 *) ((UINTN) NextVariable + VarDataOffset),
Data,
DataSize
);
}
CopyMem (GetVendorGuidPtr (NextVariable), 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.
//
SetNameSizeOfVariable (NextVariable, VarNameSize);
SetDataSizeOfVariable (NextVariable, 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;
IsCommonVariable = FALSE;
IsCommonUserVariable = FALSE;
if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == 0) {
IsCommonVariable = TRUE;
IsCommonUserVariable = IsUserVariable (NextVariable);
}
if ((((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0)
&& ((VarSize + mVariableModuleGlobal->HwErrVariableTotalSize) > PcdGet32 (PcdHwErrStorageSize)))
|| (IsCommonVariable && ((VarSize + mVariableModuleGlobal->CommonVariableTotalSize) > mVariableModuleGlobal->CommonVariableSpace))
|| (IsCommonVariable && AtRuntime () && ((VarSize + mVariableModuleGlobal->CommonVariableTotalSize) > mVariableModuleGlobal->CommonRuntimeVariableSpace))
|| (IsCommonUserVariable && ((VarSize + mVariableModuleGlobal->CommonUserVariableTotalSize) > mVariableModuleGlobal->CommonMaxUserVariableSpace))) {
if (AtRuntime ()) {
if (IsCommonUserVariable && ((VarSize + mVariableModuleGlobal->CommonUserVariableTotalSize) > mVariableModuleGlobal->CommonMaxUserVariableSpace)) {
RecordVarErrorFlag (VAR_ERROR_FLAG_USER_ERROR, VariableName, VendorGuid, Attributes, VarSize);
}
if (IsCommonVariable && ((VarSize + mVariableModuleGlobal->CommonVariableTotalSize) > mVariableModuleGlobal->CommonRuntimeVariableSpace)) {
RecordVarErrorFlag (VAR_ERROR_FLAG_SYSTEM_ERROR, VariableName, VendorGuid, Attributes, VarSize);
}
Status = EFI_OUT_OF_RESOURCES;
goto Done;
}
//
// Perform garbage collection & reclaim operation, and integrate the new variable at the same time.
//
Status = Reclaim (
mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase,
&mVariableModuleGlobal->NonVolatileLastVariableOffset,
FALSE,
Variable,
NextVariable,
HEADER_ALIGN (VarSize)
);
if (!EFI_ERROR (Status)) {
//
// The new variable has been integrated successfully during reclaiming.
//
if (Variable->CurrPtr != NULL) {
CacheVariable->CurrPtr = (VARIABLE_HEADER *)((UINTN) CacheVariable->StartPtr + ((UINTN) Variable->CurrPtr - (UINTN) Variable->StartPtr));
CacheVariable->InDeletedTransitionPtr = NULL;
}
UpdateVariableInfo (VariableName, VendorGuid, FALSE, FALSE, TRUE, FALSE, FALSE);
FlushHobVariableToFlash (VariableName, VendorGuid);
} else {
if (IsCommonUserVariable && ((VarSize + mVariableModuleGlobal->CommonUserVariableTotalSize) > mVariableModuleGlobal->CommonMaxUserVariableSpace)) {
RecordVarErrorFlag (VAR_ERROR_FLAG_USER_ERROR, VariableName, VendorGuid, Attributes, VarSize);
}
if (IsCommonVariable && ((VarSize + mVariableModuleGlobal->CommonVariableTotalSize) > mVariableModuleGlobal->CommonVariableSpace)) {
RecordVarErrorFlag (VAR_ERROR_FLAG_SYSTEM_ERROR, VariableName, VendorGuid, Attributes, VarSize);
}
}
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:
//
CacheOffset = mVariableModuleGlobal->NonVolatileLastVariableOffset;
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
FALSE,
TRUE,
Fvb,
mVariableModuleGlobal->NonVolatileLastVariableOffset,
(UINT32) GetVariableHeaderSize (),
(UINT8 *) NextVariable
);
if (EFI_ERROR (Status)) {
goto Done;
}
//
// Step 2:
//
NextVariable->State = VAR_HEADER_VALID_ONLY;
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
FALSE,
TRUE,
Fvb,
mVariableModuleGlobal->NonVolatileLastVariableOffset + OFFSET_OF (VARIABLE_HEADER, State),
sizeof (UINT8),
&NextVariable->State
);
if (EFI_ERROR (Status)) {
goto Done;
}
//
// Step 3:
//
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
FALSE,
TRUE,
Fvb,
mVariableModuleGlobal->NonVolatileLastVariableOffset + GetVariableHeaderSize (),
(UINT32) (VarSize - GetVariableHeaderSize ()),
(UINT8 *) NextVariable + GetVariableHeaderSize ()
);
if (EFI_ERROR (Status)) {
goto Done;
}
//
// Step 4:
//
NextVariable->State = VAR_ADDED;
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
FALSE,
TRUE,
Fvb,
mVariableModuleGlobal->NonVolatileLastVariableOffset + OFFSET_OF (VARIABLE_HEADER, State),
sizeof (UINT8),
&NextVariable->State
);
if (EFI_ERROR (Status)) {
goto Done;
}
mVariableModuleGlobal->NonVolatileLastVariableOffset += HEADER_ALIGN (VarSize);
if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0) {
mVariableModuleGlobal->HwErrVariableTotalSize += HEADER_ALIGN (VarSize);
} else {
mVariableModuleGlobal->CommonVariableTotalSize += HEADER_ALIGN (VarSize);
if (IsCommonUserVariable) {
mVariableModuleGlobal->CommonUserVariableTotalSize += HEADER_ALIGN (VarSize);
}
}
//
// update the memory copy of Flash region.
//
CopyMem ((UINT8 *)mNvVariableCache + CacheOffset, (UINT8 *)NextVariable, VarSize);
} else {
//
// Create a volatile variable.
//
Volatile = TRUE;
if ((UINT32) (VarSize + mVariableModuleGlobal->VolatileLastVariableOffset) >
((VARIABLE_STORE_HEADER *) ((UINTN) (mVariableModuleGlobal->VariableGlobal.VolatileVariableBase)))->Size) {
//
// Perform garbage collection & reclaim operation, and integrate the new variable at the same time.
//
Status = Reclaim (
mVariableModuleGlobal->VariableGlobal.VolatileVariableBase,
&mVariableModuleGlobal->VolatileLastVariableOffset,
TRUE,
Variable,
NextVariable,
HEADER_ALIGN (VarSize)
);
if (!EFI_ERROR (Status)) {
//
// The new variable has been integrated successfully during reclaiming.
//
if (Variable->CurrPtr != NULL) {
CacheVariable->CurrPtr = (VARIABLE_HEADER *)((UINTN) CacheVariable->StartPtr + ((UINTN) Variable->CurrPtr - (UINTN) Variable->StartPtr));
CacheVariable->InDeletedTransitionPtr = NULL;
}
UpdateVariableInfo (VariableName, VendorGuid, TRUE, FALSE, TRUE, FALSE, FALSE);
}
goto Done;
}
NextVariable->State = VAR_ADDED;
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
TRUE,
TRUE,
Fvb,
mVariableModuleGlobal->VolatileLastVariableOffset,
(UINT32) VarSize,
(UINT8 *) NextVariable
);
if (EFI_ERROR (Status)) {
goto Done;
}
mVariableModuleGlobal->VolatileLastVariableOffset += HEADER_ALIGN (VarSize);
}
//
// Mark the old variable as deleted.
//
if (!EFI_ERROR (Status) && Variable->CurrPtr != NULL) {
if (Variable->InDeletedTransitionPtr != NULL) {
//
// Both ADDED and IN_DELETED_TRANSITION old variable are present,
// set IN_DELETED_TRANSITION one to DELETED state first.
//
ASSERT (CacheVariable->InDeletedTransitionPtr != NULL);
State = CacheVariable->InDeletedTransitionPtr->State;
State &= VAR_DELETED;
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
Variable->Volatile,
FALSE,
Fvb,
(UINTN) &Variable->InDeletedTransitionPtr->State,
sizeof (UINT8),
&State
);
if (!EFI_ERROR (Status)) {
if (!Variable->Volatile) {
CacheVariable->InDeletedTransitionPtr->State = State;
}
} else {
goto Done;
}
}
State = Variable->CurrPtr->State;
State &= VAR_DELETED;
Status = UpdateVariableStore (
&mVariableModuleGlobal->VariableGlobal,
Variable->Volatile,
FALSE,
Fvb,
(UINTN) &Variable->CurrPtr->State,
sizeof (UINT8),
&State
);
if (!EFI_ERROR (Status) && !Variable->Volatile) {
CacheVariable->CurrPtr->State = State;
}
}
if (!EFI_ERROR (Status)) {
UpdateVariableInfo (VariableName, VendorGuid, Volatile, FALSE, TRUE, FALSE, FALSE);
if (!Volatile) {
FlushHobVariableToFlash (VariableName, VendorGuid);
}
}
Done:
return Status;
}
/**
This code finds variable in storage blocks (Volatile or Non-Volatile).
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode, and datasize is external input.
This function will do basic validation, before parse the data.
@param VariableName Name of Variable to be found.
@param VendorGuid Variable vendor GUID.
@param Attributes Attribute value of the variable found.
@param DataSize Size of Data found. If size is less than the
data, this value contains the required size.
@param Data The buffer to return the contents of the variable. May be NULL
with a zero DataSize in order to determine the size buffer needed.
@return EFI_INVALID_PARAMETER Invalid parameter.
@return EFI_SUCCESS Find the specified variable.
@return EFI_NOT_FOUND Not found.
@return EFI_BUFFER_TO_SMALL DataSize is too small for the result.
**/
EFI_STATUS
EFIAPI
VariableServiceGetVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT UINT32 *Attributes OPTIONAL,
IN OUT UINTN *DataSize,
OUT VOID *Data OPTIONAL
)
{
EFI_STATUS Status;
VARIABLE_POINTER_TRACK Variable;
UINTN VarDataSize;
if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {
return EFI_INVALID_PARAMETER;
}
if (VariableName[0] == 0) {
return EFI_NOT_FOUND;
}
AcquireLockOnlyAtBootTime(&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
Status = FindVariable (VariableName, VendorGuid, &Variable, &mVariableModuleGlobal->VariableGlobal, FALSE);
if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
goto Done;
}
//
// Get data size
//
VarDataSize = DataSizeOfVariable (Variable.CurrPtr);
ASSERT (VarDataSize != 0);
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;
UpdateVariableInfo (VariableName, VendorGuid, Variable.Volatile, TRUE, FALSE, FALSE, FALSE);
Status = EFI_SUCCESS;
goto Done;
} else {
*DataSize = VarDataSize;
Status = EFI_BUFFER_TOO_SMALL;
goto Done;
}
Done:
ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
return Status;
}
/**
This code Finds the Next available variable.
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode. This function will do basic validation, before parse the data.
@param[in] VariableName Pointer to variable name.
@param[in] VendorGuid Variable Vendor Guid.
@param[out] VariablePtr Pointer to variable header address.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The next variable was not found.
@retval EFI_INVALID_PARAMETER If VariableName is not an empty string, while VendorGuid is NULL.
@retval EFI_INVALID_PARAMETER The input values of VariableName and VendorGuid are not a name and
GUID of an existing variable.
**/
EFI_STATUS
EFIAPI
VariableServiceGetNextVariableInternal (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT VARIABLE_HEADER **VariablePtr
)
{
VARIABLE_STORE_TYPE Type;
VARIABLE_POINTER_TRACK Variable;
VARIABLE_POINTER_TRACK VariableInHob;
VARIABLE_POINTER_TRACK VariablePtrTrack;
EFI_STATUS Status;
VARIABLE_STORE_HEADER *VariableStoreHeader[VariableStoreTypeMax];
Status = FindVariable (VariableName, VendorGuid, &Variable, &mVariableModuleGlobal->VariableGlobal, FALSE);
if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
//
// For VariableName is an empty string, FindVariable() will try to find and return
// the first qualified variable, and if FindVariable() returns error (EFI_NOT_FOUND)
// as no any variable is found, still go to return the error (EFI_NOT_FOUND).
//
if (VariableName[0] != 0) {
//
// For VariableName is not an empty string, and FindVariable() returns error as
// VariableName and VendorGuid are not a name and GUID of an existing variable,
// there is no way to get next variable, follow spec to return EFI_INVALID_PARAMETER.
//
Status = EFI_INVALID_PARAMETER;
}
goto Done;
}
if (VariableName[0] != 0) {
//
// If variable name is not NULL, get next variable.
//
Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
}
//
// 0: Volatile, 1: HOB, 2: Non-Volatile.
// The index and attributes mapping must be kept in this order as FindVariable
// makes use of this mapping to implement search algorithm.
//
VariableStoreHeader[VariableStoreTypeVolatile] = (VARIABLE_STORE_HEADER *) (UINTN) mVariableModuleGlobal->VariableGlobal.VolatileVariableBase;
VariableStoreHeader[VariableStoreTypeHob] = (VARIABLE_STORE_HEADER *) (UINTN) mVariableModuleGlobal->VariableGlobal.HobVariableBase;
VariableStoreHeader[VariableStoreTypeNv] = mNvVariableCache;
while (TRUE) {
//
// Switch from Volatile to HOB, to Non-Volatile.
//
while (!IsValidVariableHeader (Variable.CurrPtr, Variable.EndPtr)) {
//
// Find current storage index
//
for (Type = (VARIABLE_STORE_TYPE) 0; Type < VariableStoreTypeMax; Type++) {
if ((VariableStoreHeader[Type] != NULL) && (Variable.StartPtr == GetStartPointer (VariableStoreHeader[Type]))) {
break;
}
}
ASSERT (Type < VariableStoreTypeMax);
//
// Switch to next storage
//
for (Type++; Type < VariableStoreTypeMax; Type++) {
if (VariableStoreHeader[Type] != NULL) {
break;
}
}
//
// Capture the case that
// 1. current storage is the last one, or
// 2. no further storage
//
if (Type == VariableStoreTypeMax) {
Status = EFI_NOT_FOUND;
goto Done;
}
Variable.StartPtr = GetStartPointer (VariableStoreHeader[Type]);
Variable.EndPtr = GetEndPointer (VariableStoreHeader[Type]);
Variable.CurrPtr = Variable.StartPtr;
}
//
// Variable is found
//
if (Variable.CurrPtr->State == VAR_ADDED || Variable.CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
if (!AtRuntime () || ((Variable.CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) != 0)) {
if (Variable.CurrPtr->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
//
// If it is a IN_DELETED_TRANSITION variable,
// and there is also a same ADDED one at the same time,
// don't return it.
//
VariablePtrTrack.StartPtr = Variable.StartPtr;
VariablePtrTrack.EndPtr = Variable.EndPtr;
Status = FindVariableEx (
GetVariableNamePtr (Variable.CurrPtr),
GetVendorGuidPtr (Variable.CurrPtr),
FALSE,
&VariablePtrTrack
);
if (!EFI_ERROR (Status) && VariablePtrTrack.CurrPtr->State == VAR_ADDED) {
Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
continue;
}
}
//
// Don't return NV variable when HOB overrides it
//
if ((VariableStoreHeader[VariableStoreTypeHob] != NULL) && (VariableStoreHeader[VariableStoreTypeNv] != NULL) &&
(Variable.StartPtr == GetStartPointer (VariableStoreHeader[VariableStoreTypeNv]))
) {
VariableInHob.StartPtr = GetStartPointer (VariableStoreHeader[VariableStoreTypeHob]);
VariableInHob.EndPtr = GetEndPointer (VariableStoreHeader[VariableStoreTypeHob]);
Status = FindVariableEx (
GetVariableNamePtr (Variable.CurrPtr),
GetVendorGuidPtr (Variable.CurrPtr),
FALSE,
&VariableInHob
);
if (!EFI_ERROR (Status)) {
Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
continue;
}
}
*VariablePtr = Variable.CurrPtr;
Status = EFI_SUCCESS;
goto Done;
}
}
Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
}
Done:
return Status;
}
/**
This code Finds the Next available variable.
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode. This function will do basic validation, before parse the data.
@param VariableNameSize The size of the VariableName buffer. The size must be large
enough to fit input string supplied in VariableName buffer.
@param VariableName Pointer to variable name.
@param VendorGuid Variable Vendor Guid.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The next variable was not found.
@retval EFI_BUFFER_TOO_SMALL The 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_INVALID_PARAMETER The input values of VariableName and VendorGuid are not a name and
GUID of an existing variable.
@retval EFI_INVALID_PARAMETER Null-terminator is not found in the first VariableNameSize bytes of
the input VariableName buffer.
**/
EFI_STATUS
EFIAPI
VariableServiceGetNextVariableName (
IN OUT UINTN *VariableNameSize,
IN OUT CHAR16 *VariableName,
IN OUT EFI_GUID *VendorGuid
)
{
EFI_STATUS Status;
UINTN MaxLen;
UINTN VarNameSize;
VARIABLE_HEADER *VariablePtr;
if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Calculate the possible maximum length of name string, including the Null terminator.
//
MaxLen = *VariableNameSize / sizeof (CHAR16);
if ((MaxLen == 0) || (StrnLenS (VariableName, MaxLen) == MaxLen)) {
//
// Null-terminator is not found in the first VariableNameSize bytes of the input VariableName buffer,
// follow spec to return EFI_INVALID_PARAMETER.
//
return EFI_INVALID_PARAMETER;
}
AcquireLockOnlyAtBootTime(&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
Status = VariableServiceGetNextVariableInternal (VariableName, VendorGuid, &VariablePtr);
if (!EFI_ERROR (Status)) {
VarNameSize = NameSizeOfVariable (VariablePtr);
ASSERT (VarNameSize != 0);
if (VarNameSize <= *VariableNameSize) {
CopyMem (VariableName, GetVariableNamePtr (VariablePtr), VarNameSize);
CopyMem (VendorGuid, GetVendorGuidPtr (VariablePtr), sizeof (EFI_GUID));
Status = EFI_SUCCESS;
} else {
Status = EFI_BUFFER_TOO_SMALL;
}
*VariableNameSize = VarNameSize;
}
ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
return Status;
}
/**
This code sets variable in storage blocks (Volatile or Non-Volatile).
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode, and datasize and data are external input.
This function will do basic validation, before parse the data.
This function will parse the authentication carefully to avoid security issues, like
buffer overflow, integer overflow.
This function will check attribute carefully to avoid authentication bypass.
@param VariableName Name of Variable to be found.
@param VendorGuid Variable vendor GUID.
@param Attributes Attribute value of the variable found
@param DataSize Size of Data found. If size is less than the
data, this value contains the required size.
@param Data Data pointer.
@return EFI_INVALID_PARAMETER Invalid parameter.
@return EFI_SUCCESS Set successfully.
@return EFI_OUT_OF_RESOURCES Resource not enough to set variable.
@return EFI_NOT_FOUND Not found.
@return EFI_WRITE_PROTECTED Variable is read-only.
**/
EFI_STATUS
EFIAPI
VariableServiceSetVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes,
IN UINTN DataSize,
IN VOID *Data
)
{
VARIABLE_POINTER_TRACK Variable;
EFI_STATUS Status;
VARIABLE_HEADER *NextVariable;
EFI_PHYSICAL_ADDRESS Point;
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;
}
//
// Check for reserverd bit in variable attribute.
// EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS is deprecated but we still allow
// the delete operation of common authenticated variable at user physical presence.
// So leave EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS attribute check to AuthVariableLib
//
if ((Attributes & (~(EFI_VARIABLE_ATTRIBUTES_MASK | EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS))) != 0) {
return EFI_INVALID_PARAMETER;
}
//
// Make sure if runtime bit is set, boot service bit is set also.
//
if ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == EFI_VARIABLE_RUNTIME_ACCESS) {
if ((Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) != 0) {
return EFI_UNSUPPORTED;
} else {
return EFI_INVALID_PARAMETER;
}
} else if ((Attributes & VARIABLE_ATTRIBUTE_AT_AW) != 0) {
if (!mVariableModuleGlobal->VariableGlobal.AuthSupport) {
//
// Not support authenticated variable write.
//
return EFI_INVALID_PARAMETER;
}
} else if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0) {
if (PcdGet32 (PcdHwErrStorageSize) == 0) {
//
// Not support harware error record variable variable.
//
return EFI_INVALID_PARAMETER;
}
}
//
// EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS and EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS attribute
// cannot be set both.
//
if (((Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) == EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS)
&& ((Attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) == EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS)) {
return EFI_UNSUPPORTED;
}
if ((Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) == EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) {
//
// If DataSize == AUTHINFO_SIZE and then PayloadSize is 0.
// Maybe it's the delete operation of common authenticated variable at user physical presence.
//
if (DataSize != AUTHINFO_SIZE) {
return EFI_UNSUPPORTED;
}
PayloadSize = DataSize - AUTHINFO_SIZE;
} else if ((Attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) == EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) {
//
// Sanity check for EFI_VARIABLE_AUTHENTICATION_2 descriptor.
//
if (DataSize < OFFSET_OF_AUTHINFO2_CERT_DATA ||
((EFI_VARIABLE_AUTHENTICATION_2 *) Data)->AuthInfo.Hdr.dwLength > DataSize - (OFFSET_OF (EFI_VARIABLE_AUTHENTICATION_2, AuthInfo)) ||
((EFI_VARIABLE_AUTHENTICATION_2 *) Data)->AuthInfo.Hdr.dwLength < OFFSET_OF (WIN_CERTIFICATE_UEFI_GUID, CertData)) {
return EFI_SECURITY_VIOLATION;
}
PayloadSize = DataSize - AUTHINFO2_SIZE (Data);
} else {
PayloadSize = DataSize;
}
if ((UINTN)(~0) - PayloadSize < StrSize(VariableName)){
//
// Prevent whole variable size overflow
//
return EFI_INVALID_PARAMETER;
}
//
// The size of the VariableName, including the Unicode Null in bytes plus
// the DataSize is limited to maximum size of PcdGet32 (PcdMaxHardwareErrorVariableSize)
// bytes for HwErrRec#### variable.
//
if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
if (StrSize (VariableName) + PayloadSize > PcdGet32 (PcdMaxHardwareErrorVariableSize) - GetVariableHeaderSize ()) {
return EFI_INVALID_PARAMETER;
}
} else {
//
// The size of the VariableName, including the Unicode Null in bytes plus
// the DataSize is limited to maximum size of Max(Auth)VariableSize bytes.
//
if ((Attributes & VARIABLE_ATTRIBUTE_AT_AW) != 0) {
if (StrSize (VariableName) + PayloadSize > mVariableModuleGlobal->MaxAuthVariableSize - GetVariableHeaderSize ()) {
return EFI_INVALID_PARAMETER;
}
} else {
if (StrSize (VariableName) + PayloadSize > mVariableModuleGlobal->MaxVariableSize - GetVariableHeaderSize ()) {
return EFI_INVALID_PARAMETER;
}
}
}
//
// Special Handling for MOR Lock variable.
//
Status = SetVariableCheckHandlerMor (VariableName, VendorGuid, Attributes, PayloadSize, (VOID *) ((UINTN) Data + DataSize - PayloadSize));
if (Status == EFI_ALREADY_STARTED) {
//
// EFI_ALREADY_STARTED means the SetVariable() action is handled inside of SetVariableCheckHandlerMor().
// Variable driver can just return SUCCESS.
//
return EFI_SUCCESS;
}
if (EFI_ERROR (Status)) {
return Status;
}
Status = VarCheckLibSetVariableCheck (VariableName, VendorGuid, Attributes, PayloadSize, (VOID *) ((UINTN) Data + DataSize - PayloadSize), mRequestSource);
if (EFI_ERROR (Status)) {
return Status;
}
AcquireLockOnlyAtBootTime(&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
//
// Consider reentrant in MCA/INIT/NMI. It needs be reupdated.
//
if (1 < InterlockedIncrement (&mVariableModuleGlobal->VariableGlobal.ReentrantState)) {
Point = mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase;
//
// Parse non-volatile variable data and get last variable offset.
//
NextVariable = GetStartPointer ((VARIABLE_STORE_HEADER *) (UINTN) Point);
while (IsValidVariableHeader (NextVariable, GetEndPointer ((VARIABLE_STORE_HEADER *) (UINTN) Point))) {
NextVariable = GetNextVariablePtr (NextVariable);
}
mVariableModuleGlobal->NonVolatileLastVariableOffset = (UINTN) NextVariable - (UINTN) Point;
}
//
// Check whether the input variable is already existed.
//
Status = FindVariable (VariableName, VendorGuid, &Variable, &mVariableModuleGlobal->VariableGlobal, TRUE);
if (!EFI_ERROR (Status)) {
if (((Variable.CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0) && AtRuntime ()) {
Status = EFI_WRITE_PROTECTED;
goto Done;
}
if (Attributes != 0 && (Attributes & (~EFI_VARIABLE_APPEND_WRITE)) != Variable.CurrPtr->Attributes) {
//
// If a preexisting variable is rewritten with different attributes, SetVariable() shall not
// modify the variable and shall return EFI_INVALID_PARAMETER. Two exceptions to this rule:
// 1. No access attributes specified
// 2. The only attribute differing is EFI_VARIABLE_APPEND_WRITE
//
Status = EFI_INVALID_PARAMETER;
DEBUG ((EFI_D_INFO, "[Variable]: Rewritten a preexisting variable(0x%08x) with different attributes(0x%08x) - %g:%s\n", Variable.CurrPtr->Attributes, Attributes, VendorGuid, VariableName));
goto Done;
}
}
if (!FeaturePcdGet (PcdUefiVariableDefaultLangDeprecate)) {
//
// Hook the operation of setting PlatformLangCodes/PlatformLang and LangCodes/Lang.
//
Status = AutoUpdateLangVariable (VariableName, Data, DataSize);
if (EFI_ERROR (Status)) {
//
// The auto update operation failed, directly return to avoid inconsistency between PlatformLang and Lang.
//
goto Done;
}
}
if (mVariableModuleGlobal->VariableGlobal.AuthSupport) {
Status = AuthVariableLibProcessVariable (VariableName, VendorGuid, Data, DataSize, Attributes);
} else {
Status = UpdateVariable (VariableName, VendorGuid, Data, DataSize, Attributes, 0, 0, &Variable, NULL);
}
Done:
InterlockedDecrement (&mVariableModuleGlobal->VariableGlobal.ReentrantState);
ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
if (!AtRuntime ()) {
if (!EFI_ERROR (Status)) {
SecureBootHook (
VariableName,
VendorGuid
);
}
}
return Status;
}
/**
This code returns information about the EFI variables.
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode. This function will do basic validation, before parse the data.
@param Attributes Attributes bitmask to specify the type of variables
on which to return information.
@param MaximumVariableStorageSize Pointer to the maximum size of the storage space available
for the EFI variables associated with the attributes specified.
@param RemainingVariableStorageSize Pointer to the remaining size of the storage space available
for EFI variables associated with the attributes specified.
@param MaximumVariableSize Pointer to the maximum size of an individual EFI variables
associated with the attributes specified.
@return EFI_SUCCESS Query successfully.
**/
EFI_STATUS
EFIAPI
VariableServiceQueryVariableInfoInternal (
IN UINT32 Attributes,
OUT UINT64 *MaximumVariableStorageSize,
OUT UINT64 *RemainingVariableStorageSize,
OUT UINT64 *MaximumVariableSize
)
{
VARIABLE_HEADER *Variable;
VARIABLE_HEADER *NextVariable;
UINT64 VariableSize;
VARIABLE_STORE_HEADER *VariableStoreHeader;
UINT64 CommonVariableTotalSize;
UINT64 HwErrVariableTotalSize;
EFI_STATUS Status;
VARIABLE_POINTER_TRACK VariablePtrTrack;
CommonVariableTotalSize = 0;
HwErrVariableTotalSize = 0;
if((Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
//
// Query is Volatile related.
//
VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) mVariableModuleGlobal->VariableGlobal.VolatileVariableBase);
} else {
//
// Query is Non-Volatile related.
//
VariableStoreHeader = mNvVariableCache;
}
//
// Now let's fill *MaximumVariableStorageSize *RemainingVariableStorageSize
// with the storage size (excluding the storage header size).
//
*MaximumVariableStorageSize = VariableStoreHeader->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) - GetVariableHeaderSize ();
} else {
if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
if (AtRuntime ()) {
*MaximumVariableStorageSize = mVariableModuleGlobal->CommonRuntimeVariableSpace;
} else {
*MaximumVariableStorageSize = mVariableModuleGlobal->CommonVariableSpace;
}
}
//
// Let *MaximumVariableSize be Max(Auth)VariableSize with the exception of the variable header size.
//
if ((Attributes & VARIABLE_ATTRIBUTE_AT_AW) != 0) {
*MaximumVariableSize = mVariableModuleGlobal->MaxAuthVariableSize - GetVariableHeaderSize ();
} else {
*MaximumVariableSize = mVariableModuleGlobal->MaxVariableSize - GetVariableHeaderSize ();
}
}
//
// Point to the starting address of the variables.
//
Variable = GetStartPointer (VariableStoreHeader);
//
// Now walk through the related variable store.
//
while (IsValidVariableHeader (Variable, GetEndPointer (VariableStoreHeader))) {
NextVariable = GetNextVariablePtr (Variable);
VariableSize = (UINT64) (UINTN) NextVariable - (UINT64) (UINTN) Variable;
if (AtRuntime ()) {
//
// 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 ((Variable->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 (Variable->State == VAR_ADDED) {
if ((Variable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
HwErrVariableTotalSize += VariableSize;
} else {
CommonVariableTotalSize += VariableSize;
}
} else if (Variable->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
//
// If it is a IN_DELETED_TRANSITION variable,
// and there is not also a same ADDED one at the same time,
// this IN_DELETED_TRANSITION variable is valid.
//
VariablePtrTrack.StartPtr = GetStartPointer (VariableStoreHeader);
VariablePtrTrack.EndPtr = GetEndPointer (VariableStoreHeader);
Status = FindVariableEx (
GetVariableNamePtr (Variable),
GetVendorGuidPtr (Variable),
FALSE,
&VariablePtrTrack
);
if (!EFI_ERROR (Status) && VariablePtrTrack.CurrPtr->State != VAR_ADDED) {
if ((Variable->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 {
if (*MaximumVariableStorageSize < CommonVariableTotalSize) {
*RemainingVariableStorageSize = 0;
} else {
*RemainingVariableStorageSize = *MaximumVariableStorageSize - CommonVariableTotalSize;
}
}
if (*RemainingVariableStorageSize < GetVariableHeaderSize ()) {
*MaximumVariableSize = 0;
} else if ((*RemainingVariableStorageSize - GetVariableHeaderSize ()) < *MaximumVariableSize) {
*MaximumVariableSize = *RemainingVariableStorageSize - GetVariableHeaderSize ();
}
return EFI_SUCCESS;
}
/**
This code returns information about the EFI variables.
Caution: This function may receive untrusted input.
This function may be invoked in SMM mode. This function will do basic validation, before parse the data.
@param Attributes Attributes bitmask to specify the type of variables
on which to return information.
@param MaximumVariableStorageSize Pointer to the maximum size of the storage space available
for the EFI variables associated with the attributes specified.
@param RemainingVariableStorageSize Pointer to the remaining size of the storage space available
for EFI variables associated with the attributes specified.
@param MaximumVariableSize Pointer to the maximum size of an individual EFI variables
associated with the attributes specified.
@return EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied.
@return EFI_SUCCESS Query successfully.
@return EFI_UNSUPPORTED The attribute is not supported on this platform.
**/
EFI_STATUS
EFIAPI
VariableServiceQueryVariableInfo (
IN UINT32 Attributes,
OUT UINT64 *MaximumVariableStorageSize,
OUT UINT64 *RemainingVariableStorageSize,
OUT UINT64 *MaximumVariableSize
)
{
EFI_STATUS Status;
if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {
return EFI_INVALID_PARAMETER;
}
if ((Attributes & EFI_VARIABLE_AUTHENTICATED_WRITE_ACCESS) != 0) {
//
// Deprecated attribute, make this check as highest priority.
//
return EFI_UNSUPPORTED;
}
if ((Attributes & EFI_VARIABLE_ATTRIBUTES_MASK) == 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 (AtRuntime () && ((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;
} else if ((Attributes & VARIABLE_ATTRIBUTE_AT_AW) != 0) {
if (!mVariableModuleGlobal->VariableGlobal.AuthSupport) {
//
// Not support authenticated variable write.
//
return EFI_UNSUPPORTED;
}
} else if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0) {
if (PcdGet32 (PcdHwErrStorageSize) == 0) {
//
// Not support harware error record variable variable.
//
return EFI_UNSUPPORTED;
}
}
AcquireLockOnlyAtBootTime(&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
Status = VariableServiceQueryVariableInfoInternal (
Attributes,
MaximumVariableStorageSize,
RemainingVariableStorageSize,
MaximumVariableSize
);
ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
return Status;
}
/**
This function reclaims variable storage if free size is below the threshold.
Caution: This function may be invoked at SMM mode.
Care must be taken to make sure not security issue.
**/
VOID
ReclaimForOS(
VOID
)
{
EFI_STATUS Status;
UINTN RemainingCommonRuntimeVariableSpace;
UINTN RemainingHwErrVariableSpace;
STATIC BOOLEAN Reclaimed;
//
// This function will be called only once at EndOfDxe or ReadyToBoot event.
//
if (Reclaimed) {
return;
}
Reclaimed = TRUE;
Status = EFI_SUCCESS;
if (mVariableModuleGlobal->CommonRuntimeVariableSpace < mVariableModuleGlobal->CommonVariableTotalSize) {
RemainingCommonRuntimeVariableSpace = 0;
} else {
RemainingCommonRuntimeVariableSpace = mVariableModuleGlobal->CommonRuntimeVariableSpace - mVariableModuleGlobal->CommonVariableTotalSize;
}
RemainingHwErrVariableSpace = PcdGet32 (PcdHwErrStorageSize) - mVariableModuleGlobal->HwErrVariableTotalSize;
//
// Check if the free area is below a threshold.
//
if (((RemainingCommonRuntimeVariableSpace < mVariableModuleGlobal->MaxVariableSize) ||
(RemainingCommonRuntimeVariableSpace < mVariableModuleGlobal->MaxAuthVariableSize)) ||
((PcdGet32 (PcdHwErrStorageSize) != 0) &&
(RemainingHwErrVariableSpace < PcdGet32 (PcdMaxHardwareErrorVariableSize)))){
Status = Reclaim (
mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase,
&mVariableModuleGlobal->NonVolatileLastVariableOffset,
FALSE,
NULL,
NULL,
0
);
ASSERT_EFI_ERROR (Status);
}
}
/**
Get non-volatile maximum variable size.
@return Non-volatile maximum variable size.
**/
UINTN
GetNonVolatileMaxVariableSize (
VOID
)
{
if (PcdGet32 (PcdHwErrStorageSize) != 0) {
return MAX (MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxAuthVariableSize)),
PcdGet32 (PcdMaxHardwareErrorVariableSize));
} else {
return MAX (PcdGet32 (PcdMaxVariableSize), PcdGet32 (PcdMaxAuthVariableSize));
}
}
/**
Init non-volatile variable store.
@param[out] NvFvHeader Output pointer to non-volatile FV header address.
@retval EFI_SUCCESS Function successfully executed.
@retval EFI_OUT_OF_RESOURCES Fail to allocate enough memory resource.
@retval EFI_VOLUME_CORRUPTED Variable Store or Firmware Volume for Variable Store is corrupted.
**/
EFI_STATUS
InitNonVolatileVariableStore (
OUT EFI_FIRMWARE_VOLUME_HEADER **NvFvHeader
)
{
EFI_FIRMWARE_VOLUME_HEADER *FvHeader;
VARIABLE_HEADER *Variable;
VARIABLE_HEADER *NextVariable;
EFI_PHYSICAL_ADDRESS VariableStoreBase;
UINT64 VariableStoreLength;
UINTN VariableSize;
EFI_HOB_GUID_TYPE *GuidHob;
EFI_PHYSICAL_ADDRESS NvStorageBase;
UINT8 *NvStorageData;
UINT32 NvStorageSize;
FAULT_TOLERANT_WRITE_LAST_WRITE_DATA *FtwLastWriteData;
UINT32 BackUpOffset;
UINT32 BackUpSize;
UINT32 HwErrStorageSize;
UINT32 MaxUserNvVariableSpaceSize;
UINT32 BoottimeReservedNvVariableSpaceSize;
EFI_STATUS Status;
VOID *FtwProtocol;
mVariableModuleGlobal->FvbInstance = NULL;
//
// Allocate runtime memory used for a memory copy of the FLASH region.
// Keep the memory and the FLASH in sync as updates occur.
//
NvStorageSize = PcdGet32 (PcdFlashNvStorageVariableSize);
NvStorageData = AllocateRuntimeZeroPool (NvStorageSize);
if (NvStorageData == NULL) {
return EFI_OUT_OF_RESOURCES;
}
NvStorageBase = (EFI_PHYSICAL_ADDRESS) PcdGet64 (PcdFlashNvStorageVariableBase64);
if (NvStorageBase == 0) {
NvStorageBase = (EFI_PHYSICAL_ADDRESS) PcdGet32 (PcdFlashNvStorageVariableBase);
}
//
// Copy NV storage data to the memory buffer.
//
CopyMem (NvStorageData, (UINT8 *) (UINTN) NvStorageBase, NvStorageSize);
Status = GetFtwProtocol ((VOID **)&FtwProtocol);
//
// If FTW protocol has been installed, no need to check FTW last write data hob.
//
if (EFI_ERROR (Status)) {
//
// Check the FTW last write data hob.
//
GuidHob = GetFirstGuidHob (&gEdkiiFaultTolerantWriteGuid);
if (GuidHob != NULL) {
FtwLastWriteData = (FAULT_TOLERANT_WRITE_LAST_WRITE_DATA *) GET_GUID_HOB_DATA (GuidHob);
if (FtwLastWriteData->TargetAddress == NvStorageBase) {
DEBUG ((EFI_D_INFO, "Variable: NV storage is backed up in spare block: 0x%x\n", (UINTN) FtwLastWriteData->SpareAddress));
//
// Copy the backed up NV storage data to the memory buffer from spare block.
//
CopyMem (NvStorageData, (UINT8 *) (UINTN) (FtwLastWriteData->SpareAddress), NvStorageSize);
} else if ((FtwLastWriteData->TargetAddress > NvStorageBase) &&
(FtwLastWriteData->TargetAddress < (NvStorageBase + NvStorageSize))) {
//
// Flash NV storage from the Offset is backed up in spare block.
//
BackUpOffset = (UINT32) (FtwLastWriteData->TargetAddress - NvStorageBase);
BackUpSize = NvStorageSize - BackUpOffset;
DEBUG ((EFI_D_INFO, "Variable: High partial NV storage from offset: %x is backed up in spare block: 0x%x\n", BackUpOffset, (UINTN) FtwLastWriteData->SpareAddress));
//
// Copy the partial backed up NV storage data to the memory buffer from spare block.
//
CopyMem (NvStorageData + BackUpOffset, (UINT8 *) (UINTN) FtwLastWriteData->SpareAddress, BackUpSize);
}
}
}
FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *) NvStorageData;
//
// Check if the Firmware Volume is not corrupted
//
if ((FvHeader->Signature != EFI_FVH_SIGNATURE) || (!CompareGuid (&gEfiSystemNvDataFvGuid, &FvHeader->FileSystemGuid))) {
FreePool (NvStorageData);
DEBUG ((EFI_D_ERROR, "Firmware Volume for Variable Store is corrupted\n"));
return EFI_VOLUME_CORRUPTED;
}
VariableStoreBase = (UINTN) FvHeader + FvHeader->HeaderLength;
VariableStoreLength = NvStorageSize - FvHeader->HeaderLength;
mNvFvHeaderCache = FvHeader;
mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase = VariableStoreBase;
mNvVariableCache = (VARIABLE_STORE_HEADER *) (UINTN) VariableStoreBase;
if (GetVariableStoreStatus (mNvVariableCache) != EfiValid) {
FreePool (NvStorageData);
mNvFvHeaderCache = NULL;
mNvVariableCache = NULL;
DEBUG((EFI_D_ERROR, "Variable Store header is corrupted\n"));
return EFI_VOLUME_CORRUPTED;
}
ASSERT(mNvVariableCache->Size == VariableStoreLength);
ASSERT (sizeof (VARIABLE_STORE_HEADER) <= VariableStoreLength);
mVariableModuleGlobal->VariableGlobal.AuthFormat = (BOOLEAN)(CompareGuid (&mNvVariableCache->Signature, &gEfiAuthenticatedVariableGuid));
HwErrStorageSize = PcdGet32 (PcdHwErrStorageSize);
MaxUserNvVariableSpaceSize = PcdGet32 (PcdMaxUserNvVariableSpaceSize);
BoottimeReservedNvVariableSpaceSize = PcdGet32 (PcdBoottimeReservedNvVariableSpaceSize);
//
// 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 the value of
// (VariableStoreLength - sizeof (VARIABLE_STORE_HEADER)).
//
ASSERT (HwErrStorageSize < (VariableStoreLength - sizeof (VARIABLE_STORE_HEADER)));
//
// Ensure that the value of PcdMaxUserNvVariableSpaceSize is less than the value of
// (VariableStoreLength - sizeof (VARIABLE_STORE_HEADER)) - PcdGet32 (PcdHwErrStorageSize).
//
ASSERT (MaxUserNvVariableSpaceSize < (VariableStoreLength - sizeof (VARIABLE_STORE_HEADER) - HwErrStorageSize));
//
// Ensure that the value of PcdBoottimeReservedNvVariableSpaceSize is less than the value of
// (VariableStoreLength - sizeof (VARIABLE_STORE_HEADER)) - PcdGet32 (PcdHwErrStorageSize).
//
ASSERT (BoottimeReservedNvVariableSpaceSize < (VariableStoreLength - sizeof (VARIABLE_STORE_HEADER) - HwErrStorageSize));
mVariableModuleGlobal->CommonVariableSpace = ((UINTN) VariableStoreLength - sizeof (VARIABLE_STORE_HEADER) - HwErrStorageSize);
mVariableModuleGlobal->CommonMaxUserVariableSpace = ((MaxUserNvVariableSpaceSize != 0) ? MaxUserNvVariableSpaceSize : mVariableModuleGlobal->CommonVariableSpace);
mVariableModuleGlobal->CommonRuntimeVariableSpace = mVariableModuleGlobal->CommonVariableSpace - BoottimeReservedNvVariableSpaceSize;
DEBUG ((EFI_D_INFO, "Variable driver common space: 0x%x 0x%x 0x%x\n", mVariableModuleGlobal->CommonVariableSpace, mVariableModuleGlobal->CommonMaxUserVariableSpace, mVariableModuleGlobal->CommonRuntimeVariableSpace));
//
// The max NV variable size should be < (VariableStoreLength - sizeof (VARIABLE_STORE_HEADER)).
//
ASSERT (GetNonVolatileMaxVariableSize () < (VariableStoreLength - sizeof (VARIABLE_STORE_HEADER)));
mVariableModuleGlobal->MaxVariableSize = PcdGet32 (PcdMaxVariableSize);
mVariableModuleGlobal->MaxAuthVariableSize = ((PcdGet32 (PcdMaxAuthVariableSize) != 0) ? PcdGet32 (PcdMaxAuthVariableSize) : mVariableModuleGlobal->MaxVariableSize);
//
// Parse non-volatile variable data and get last variable offset.
//
Variable = GetStartPointer ((VARIABLE_STORE_HEADER *)(UINTN)VariableStoreBase);
while (IsValidVariableHeader (Variable, GetEndPointer ((VARIABLE_STORE_HEADER *)(UINTN)VariableStoreBase))) {
NextVariable = GetNextVariablePtr (Variable);
VariableSize = (UINTN) NextVariable - (UINTN) Variable;
if ((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) VariableStoreBase;
*NvFvHeader = FvHeader;
return EFI_SUCCESS;
}
/**
Flush the HOB variable to flash.
@param[in] VariableName Name of variable has been updated or deleted.
@param[in] VendorGuid Guid of variable has been updated or deleted.
**/
VOID
FlushHobVariableToFlash (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid
)
{
EFI_STATUS Status;
VARIABLE_STORE_HEADER *VariableStoreHeader;
VARIABLE_HEADER *Variable;
VOID *VariableData;
VARIABLE_POINTER_TRACK VariablePtrTrack;
BOOLEAN ErrorFlag;
ErrorFlag = FALSE;
//
// Flush the HOB variable to flash.
//
if (mVariableModuleGlobal->VariableGlobal.HobVariableBase != 0) {
VariableStoreHeader = (VARIABLE_STORE_HEADER *) (UINTN) mVariableModuleGlobal->VariableGlobal.HobVariableBase;
//
// Set HobVariableBase to 0, it can avoid SetVariable to call back.
//
mVariableModuleGlobal->VariableGlobal.HobVariableBase = 0;
for ( Variable = GetStartPointer (VariableStoreHeader)
; IsValidVariableHeader (Variable, GetEndPointer (VariableStoreHeader))
; Variable = GetNextVariablePtr (Variable)
) {
if (Variable->State != VAR_ADDED) {
//
// The HOB variable has been set to DELETED state in local.
//
continue;
}
ASSERT ((Variable->Attributes & EFI_VARIABLE_NON_VOLATILE) != 0);
if (VendorGuid == NULL || VariableName == NULL ||
!CompareGuid (VendorGuid, GetVendorGuidPtr (Variable)) ||
StrCmp (VariableName, GetVariableNamePtr (Variable)) != 0) {
VariableData = GetVariableDataPtr (Variable);
FindVariable (GetVariableNamePtr (Variable), GetVendorGuidPtr (Variable), &VariablePtrTrack, &mVariableModuleGlobal->VariableGlobal, FALSE);
Status = UpdateVariable (
GetVariableNamePtr (Variable),
GetVendorGuidPtr (Variable),
VariableData,
DataSizeOfVariable (Variable),
Variable->Attributes,
0,
0,
&VariablePtrTrack,
NULL
);
DEBUG ((EFI_D_INFO, "Variable driver flush the HOB variable to flash: %g %s %r\n", GetVendorGuidPtr (Variable), GetVariableNamePtr (Variable), Status));
} else {
//
// The updated or deleted variable is matched with this HOB variable.
// Don't break here because we will try to set other HOB variables
// since this variable could be set successfully.
//
Status = EFI_SUCCESS;
}
if (!EFI_ERROR (Status)) {
//
// If set variable successful, or the updated or deleted variable is matched with the HOB variable,
// set the HOB variable to DELETED state in local.
//
DEBUG ((EFI_D_INFO, "Variable driver set the HOB variable to DELETED state in local: %g %s\n", GetVendorGuidPtr (Variable), GetVariableNamePtr (Variable)));
Variable->State &= VAR_DELETED;
} else {
ErrorFlag = TRUE;
}
}
if (ErrorFlag) {
//
// We still have HOB variable(s) not flushed in flash.
//
mVariableModuleGlobal->VariableGlobal.HobVariableBase = (EFI_PHYSICAL_ADDRESS) (UINTN) VariableStoreHeader;
} else {
//
// All HOB variables have been flushed in flash.
//
DEBUG ((EFI_D_INFO, "Variable driver: all HOB variables have been flushed in flash.\n"));
if (!AtRuntime ()) {
FreePool ((VOID *) VariableStoreHeader);
}
}
}
}
/**
Initializes variable write service after FTW was ready.
@retval EFI_SUCCESS Function successfully executed.
@retval Others Fail to initialize the variable service.
**/
EFI_STATUS
VariableWriteServiceInitialize (
VOID
)
{
EFI_STATUS Status;
UINTN Index;
UINT8 Data;
EFI_PHYSICAL_ADDRESS VariableStoreBase;
EFI_PHYSICAL_ADDRESS NvStorageBase;
VARIABLE_ENTRY_PROPERTY *VariableEntry;
AcquireLockOnlyAtBootTime(&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
NvStorageBase = (EFI_PHYSICAL_ADDRESS) PcdGet64 (PcdFlashNvStorageVariableBase64);
if (NvStorageBase == 0) {
NvStorageBase = (EFI_PHYSICAL_ADDRESS) PcdGet32 (PcdFlashNvStorageVariableBase);
}
VariableStoreBase = NvStorageBase + (mNvFvHeaderCache->HeaderLength);
//
// Let NonVolatileVariableBase point to flash variable store base directly after FTW ready.
//
mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase = VariableStoreBase;
//
// Check if the free area is really free.
//
for (Index = mVariableModuleGlobal->NonVolatileLastVariableOffset; Index < mNvVariableCache->Size; Index++) {
Data = ((UINT8 *) mNvVariableCache)[Index];
if (Data != 0xff) {
//
// There must be something wrong in variable store, do reclaim operation.
//
Status = Reclaim (
mVariableModuleGlobal->VariableGlobal.NonVolatileVariableBase,
&mVariableModuleGlobal->NonVolatileLastVariableOffset,
FALSE,
NULL,
NULL,
0
);
if (EFI_ERROR (Status)) {
ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
return Status;
}
break;
}
}
FlushHobVariableToFlash (NULL, NULL);
Status = EFI_SUCCESS;
ZeroMem (&mAuthContextOut, sizeof (mAuthContextOut));
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
//
// Authenticated variable initialize.
//
mAuthContextIn.StructSize = sizeof (AUTH_VAR_LIB_CONTEXT_IN);
mAuthContextIn.MaxAuthVariableSize = mVariableModuleGlobal->MaxAuthVariableSize - GetVariableHeaderSize ();
Status = AuthVariableLibInitialize (&mAuthContextIn, &mAuthContextOut);
if (!EFI_ERROR (Status)) {
DEBUG ((EFI_D_INFO, "Variable driver will work with auth variable support!\n"));
mVariableModuleGlobal->VariableGlobal.AuthSupport = TRUE;
if (mAuthContextOut.AuthVarEntry != NULL) {
for (Index = 0; Index < mAuthContextOut.AuthVarEntryCount; Index++) {
VariableEntry = &mAuthContextOut.AuthVarEntry[Index];
Status = VarCheckLibVariablePropertySet (
VariableEntry->Name,
VariableEntry->Guid,
&VariableEntry->VariableProperty
);
ASSERT_EFI_ERROR (Status);
}
}
} else if (Status == EFI_UNSUPPORTED) {
DEBUG ((EFI_D_INFO, "NOTICE - AuthVariableLibInitialize() returns %r!\n", Status));
DEBUG ((EFI_D_INFO, "Variable driver will continue to work without auth variable support!\n"));
mVariableModuleGlobal->VariableGlobal.AuthSupport = FALSE;
Status = EFI_SUCCESS;
}
}
if (!EFI_ERROR (Status)) {
for (Index = 0; Index < ARRAY_SIZE (mVariableEntryProperty); Index++) {
VariableEntry = &mVariableEntryProperty[Index];
Status = VarCheckLibVariablePropertySet (VariableEntry->Name, VariableEntry->Guid, &VariableEntry->VariableProperty);
ASSERT_EFI_ERROR (Status);
}
}
ReleaseLockOnlyAtBootTime (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock);
//
// Initialize MOR Lock variable.
//
MorLockInit ();
return Status;
}
/**
Convert normal variable storage to the allocated auth variable storage.
@param[in] NormalVarStorage Pointer to the normal variable storage header
@retval the allocated auth variable storage
**/
VOID *
ConvertNormalVarStorageToAuthVarStorage (
VARIABLE_STORE_HEADER *NormalVarStorage
)
{
VARIABLE_HEADER *StartPtr;
UINT8 *NextPtr;
VARIABLE_HEADER *EndPtr;
UINTN AuthVarStroageSize;
AUTHENTICATED_VARIABLE_HEADER *AuthStartPtr;
VARIABLE_STORE_HEADER *AuthVarStorage;
AuthVarStroageSize = sizeof (VARIABLE_STORE_HEADER);
//
// Set AuthFormat as FALSE for normal variable storage
//
mVariableModuleGlobal->VariableGlobal.AuthFormat = FALSE;
//
// Calculate Auth Variable Storage Size
//
StartPtr = GetStartPointer (NormalVarStorage);
EndPtr = GetEndPointer (NormalVarStorage);
while (StartPtr < EndPtr) {
if (StartPtr->State == VAR_ADDED) {
AuthVarStroageSize = HEADER_ALIGN (AuthVarStroageSize);
AuthVarStroageSize += sizeof (AUTHENTICATED_VARIABLE_HEADER);
AuthVarStroageSize += StartPtr->NameSize + GET_PAD_SIZE (StartPtr->NameSize);
AuthVarStroageSize += StartPtr->DataSize + GET_PAD_SIZE (StartPtr->DataSize);
}
StartPtr = GetNextVariablePtr (StartPtr);
}
//
// Allocate Runtime memory for Auth Variable Storage
//
AuthVarStorage = AllocateRuntimeZeroPool (AuthVarStroageSize);
ASSERT (AuthVarStorage != NULL);
if (AuthVarStorage == NULL) {
return NULL;
}
//
// Copy Variable from Normal storage to Auth storage
//
StartPtr = GetStartPointer (NormalVarStorage);
EndPtr = GetEndPointer (NormalVarStorage);
AuthStartPtr = (AUTHENTICATED_VARIABLE_HEADER *) GetStartPointer (AuthVarStorage);
while (StartPtr < EndPtr) {
if (StartPtr->State == VAR_ADDED) {
AuthStartPtr = (AUTHENTICATED_VARIABLE_HEADER *) HEADER_ALIGN (AuthStartPtr);
//
// Copy Variable Header
//
AuthStartPtr->StartId = StartPtr->StartId;
AuthStartPtr->State = StartPtr->State;
AuthStartPtr->Attributes = StartPtr->Attributes;
AuthStartPtr->NameSize = StartPtr->NameSize;
AuthStartPtr->DataSize = StartPtr->DataSize;
CopyGuid (&AuthStartPtr->VendorGuid, &StartPtr->VendorGuid);
//
// Copy Variable Name
//
NextPtr = (UINT8 *) (AuthStartPtr + 1);
CopyMem (NextPtr, GetVariableNamePtr (StartPtr), AuthStartPtr->NameSize);
//
// Copy Variable Data
//
NextPtr = NextPtr + AuthStartPtr->NameSize + GET_PAD_SIZE (AuthStartPtr->NameSize);
CopyMem (NextPtr, GetVariableDataPtr (StartPtr), AuthStartPtr->DataSize);
//
// Go to next variable
//
AuthStartPtr = (AUTHENTICATED_VARIABLE_HEADER *) (NextPtr + AuthStartPtr->DataSize + GET_PAD_SIZE (AuthStartPtr->DataSize));
}
StartPtr = GetNextVariablePtr (StartPtr);
}
//
// Update Auth Storage Header
//
AuthVarStorage->Format = NormalVarStorage->Format;
AuthVarStorage->State = NormalVarStorage->State;
AuthVarStorage->Size = (UINT32)((UINTN)AuthStartPtr - (UINTN)AuthVarStorage);
CopyGuid (&AuthVarStorage->Signature, &gEfiAuthenticatedVariableGuid);
ASSERT (AuthVarStorage->Size <= AuthVarStroageSize);
//
// Restore AuthFormat
//
mVariableModuleGlobal->VariableGlobal.AuthFormat = TRUE;
return AuthVarStorage;
}
/**
Initializes variable store area for non-volatile and volatile variable.
@retval EFI_SUCCESS Function successfully executed.
@retval EFI_OUT_OF_RESOURCES Fail to allocate enough memory resource.
**/
EFI_STATUS
VariableCommonInitialize (
VOID
)
{
EFI_STATUS Status;
VARIABLE_STORE_HEADER *VolatileVariableStore;
VARIABLE_STORE_HEADER *VariableStoreHeader;
UINT64 VariableStoreLength;
UINTN ScratchSize;
EFI_HOB_GUID_TYPE *GuidHob;
EFI_GUID *VariableGuid;
EFI_FIRMWARE_VOLUME_HEADER *NvFvHeader;
BOOLEAN IsNormalVariableHob;
//
// Allocate runtime memory for variable driver global structure.
//
mVariableModuleGlobal = AllocateRuntimeZeroPool (sizeof (VARIABLE_MODULE_GLOBAL));
if (mVariableModuleGlobal == NULL) {
return EFI_OUT_OF_RESOURCES;
}
InitializeLock (&mVariableModuleGlobal->VariableGlobal.VariableServicesLock, TPL_NOTIFY);
//
// Init non-volatile variable store.
//
NvFvHeader = NULL;
Status = InitNonVolatileVariableStore (&NvFvHeader);
if (EFI_ERROR (Status)) {
FreePool (mVariableModuleGlobal);
return Status;
}
//
// mVariableModuleGlobal->VariableGlobal.AuthFormat
// has been initialized in InitNonVolatileVariableStore().
//
if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
DEBUG ((EFI_D_INFO, "Variable driver will work with auth variable format!\n"));
//
// Set AuthSupport to FALSE first, VariableWriteServiceInitialize() will initialize it.
//
mVariableModuleGlobal->VariableGlobal.AuthSupport = FALSE;
VariableGuid = &gEfiAuthenticatedVariableGuid;
} else {
DEBUG ((EFI_D_INFO, "Variable driver will work without auth variable support!\n"));
mVariableModuleGlobal->VariableGlobal.AuthSupport = FALSE;
VariableGuid = &gEfiVariableGuid;
}
//
// Get HOB variable store.
//
IsNormalVariableHob = FALSE;
GuidHob = GetFirstGuidHob (VariableGuid);
if (GuidHob == NULL && VariableGuid == &gEfiAuthenticatedVariableGuid) {
//
// Try getting it from normal variable HOB
//
GuidHob = GetFirstGuidHob (&gEfiVariableGuid);
IsNormalVariableHob = TRUE;
}
if (GuidHob != NULL) {
VariableStoreHeader = GET_GUID_HOB_DATA (GuidHob);
VariableStoreLength = GuidHob->Header.HobLength - sizeof (EFI_HOB_GUID_TYPE);
if (GetVariableStoreStatus (VariableStoreHeader) == EfiValid) {
if (!IsNormalVariableHob) {
mVariableModuleGlobal->VariableGlobal.HobVariableBase = (EFI_PHYSICAL_ADDRESS) (UINTN) AllocateRuntimeCopyPool ((UINTN) VariableStoreLength, (VOID *) VariableStoreHeader);
} else {
mVariableModuleGlobal->VariableGlobal.HobVariableBase = (EFI_PHYSICAL_ADDRESS) (UINTN) ConvertNormalVarStorageToAuthVarStorage ((VOID *) VariableStoreHeader);
}
if (mVariableModuleGlobal->VariableGlobal.HobVariableBase == 0) {
FreePool (NvFvHeader);
FreePool (mVariableModuleGlobal);
return EFI_OUT_OF_RESOURCES;
}
} else {
DEBUG ((EFI_D_ERROR, "HOB Variable Store header is corrupted!\n"));
}
}
//
// Allocate memory for volatile variable store, note that there is a scratch space to store scratch data.
//
ScratchSize = GetNonVolatileMaxVariableSize ();
mVariableModuleGlobal->ScratchBufferSize = ScratchSize;
VolatileVariableStore = AllocateRuntimePool (PcdGet32 (PcdVariableStoreSize) + ScratchSize);
if (VolatileVariableStore == NULL) {
if (mVariableModuleGlobal->VariableGlobal.HobVariableBase != 0) {
FreePool ((VOID *) (UINTN) mVariableModuleGlobal->VariableGlobal.HobVariableBase);
}
FreePool (NvFvHeader);
FreePool (mVariableModuleGlobal);
return EFI_OUT_OF_RESOURCES;
}
SetMem (VolatileVariableStore, PcdGet32 (PcdVariableStoreSize) + ScratchSize, 0xff);
//
// Initialize Variable Specific Data.
//
mVariableModuleGlobal->VariableGlobal.VolatileVariableBase = (EFI_PHYSICAL_ADDRESS) (UINTN) VolatileVariableStore;
mVariableModuleGlobal->VolatileLastVariableOffset = (UINTN) GetStartPointer (VolatileVariableStore) - (UINTN) VolatileVariableStore;
CopyGuid (&VolatileVariableStore->Signature, VariableGuid);
VolatileVariableStore->Size = PcdGet32 (PcdVariableStoreSize);
VolatileVariableStore->Format = VARIABLE_STORE_FORMATTED;
VolatileVariableStore->State = VARIABLE_STORE_HEALTHY;
VolatileVariableStore->Reserved = 0;
VolatileVariableStore->Reserved1 = 0;
return EFI_SUCCESS;
}
/**
Get the proper fvb handle and/or fvb protocol by the given Flash address.
@param[in] Address The Flash address.
@param[out] FvbHandle In output, if it is not NULL, it points to the proper FVB handle.
@param[out] FvbProtocol In output, if it is not NULL, it points to the proper FVB protocol.
**/
EFI_STATUS
GetFvbInfoByAddress (
IN EFI_PHYSICAL_ADDRESS Address,
OUT EFI_HANDLE *FvbHandle OPTIONAL,
OUT EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL **FvbProtocol OPTIONAL
)
{
EFI_STATUS Status;
EFI_HANDLE *HandleBuffer;
UINTN HandleCount;
UINTN Index;
EFI_PHYSICAL_ADDRESS FvbBaseAddress;
EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *Fvb;
EFI_FVB_ATTRIBUTES_2 Attributes;
UINTN BlockSize;
UINTN NumberOfBlocks;
HandleBuffer = NULL;
//
// Get all FVB handles.
//
Status = GetFvbCountAndBuffer (&HandleCount, &HandleBuffer);
if (EFI_ERROR (Status)) {
return EFI_NOT_FOUND;
}
//
// Get the FVB to access variable store.
//
Fvb = NULL;
for (Index = 0; Index < HandleCount; Index += 1, Status = EFI_NOT_FOUND, Fvb = NULL) {
Status = GetFvbByHandle (HandleBuffer[Index], &Fvb);
if (EFI_ERROR (Status)) {
Status = EFI_NOT_FOUND;
break;
}
//
// Ensure this FVB protocol supported Write operation.
//
Status = Fvb->GetAttributes (Fvb, &Attributes);
if (EFI_ERROR (Status) || ((Attributes & EFI_FVB2_WRITE_STATUS) == 0)) {
continue;
}
//
// Compare the address and select the right one.
//
Status = Fvb->GetPhysicalAddress (Fvb, &FvbBaseAddress);
if (EFI_ERROR (Status)) {
continue;
}
//
// Assume one FVB has one type of BlockSize.
//
Status = Fvb->GetBlockSize (Fvb, 0, &BlockSize, &NumberOfBlocks);
if (EFI_ERROR (Status)) {
continue;
}
if ((Address >= FvbBaseAddress) && (Address < (FvbBaseAddress + BlockSize * NumberOfBlocks))) {
if (FvbHandle != NULL) {
*FvbHandle = HandleBuffer[Index];
}
if (FvbProtocol != NULL) {
*FvbProtocol = Fvb;
}
Status = EFI_SUCCESS;
break;
}
}
FreePool (HandleBuffer);
if (Fvb == NULL) {
Status = EFI_NOT_FOUND;
}
return Status;
}