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audk/MdeModulePkg/Universal/Variable/EmuRuntimeDxe/EmuVariable.c

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/** @file
Emulation Variable services operate on the runtime volatile memory.
The nonvolatile variable space doesn't exist.
Copyright (c) 2006 - 2008, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "Variable.h"
///
/// Don't use module globals after the SetVirtualAddress map is signaled
///
ESAL_VARIABLE_GLOBAL *mVariableModuleGlobal;
VARIABLE_INFO_ENTRY *gVariableInfo = NULL;
///
/// The size of a 3 character ISO639 language code.
///
#define ISO_639_2_ENTRY_SIZE 3
/**
Update the variable region with Variable information. These are the same
arguments as the EFI Variable services.
@param[in] VariableName Name of variable
@param[in] VendorGuid Guid of variable
@param[in] Data Variable data
@param[in] DataSize Size of data. 0 means delete
@param[in] Attributes Attribues of the variable
@param[in] Variable The variable information which is used to keep track of variable usage.
@retval EFI_SUCCESS The update operation is success.
@retval EFI_OUT_OF_RESOURCES Variable region is full, can not write other data into this region.
**/
EFI_STATUS
EFIAPI
UpdateVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN VOID *Data,
IN UINTN DataSize,
IN UINT32 Attributes OPTIONAL,
IN VARIABLE_POINTER_TRACK *Variable
);
/**
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.
Otherwise, VariableName and VendorGuid are compared.
@param VariableName Name of the variable to be found.
@param VendorGuid Vendor GUID to be found.
@param PtrTrack VARIABLE_POINTER_TRACK structure for output,
including the range searched and the target position.
@param Global Pointer to VARIABLE_GLOBAL structure, including
base of volatile variable storage area, base of
NV variable storage area, and a lock.
@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
);
/**
Acquires lock only at boot time. Simply returns at runtime.
This is a temperary function which will be removed when
EfiAcquireLock() in UefiLib can handle the call in UEFI
Runtimer driver in RT phase.
It calls EfiAcquireLock() at boot time, and simply returns
at runtime
@param Lock A pointer to the lock to acquire
**/
VOID
AcquireLockOnlyAtBootTime (
IN EFI_LOCK *Lock
)
{
if (!EfiAtRuntime ()) {
EfiAcquireLock (Lock);
}
}
/**
Releases lock only at boot time. Simply returns at runtime.
This is a temperary function which will be removed when
EfiReleaseLock() in UefiLib can handle the call in UEFI
Runtimer driver in RT phase.
It calls EfiReleaseLock() at boot time, and simply returns
at runtime
@param Lock A pointer to the lock to release
**/
VOID
ReleaseLockOnlyAtBootTime (
IN EFI_LOCK *Lock
)
{
if (!EfiAtRuntime ()) {
EfiReleaseLock (Lock);
}
}
/**
Gets pointer to the variable data.
This function gets the pointer to the variable data according
to the input pointer to the variable header.
@param Variable Pointer to the variable header.
@return Pointer to variable data
**/
UINT8 *
GetVariableDataPtr (
IN VARIABLE_HEADER *Variable
)
{
if (Variable->StartId != VARIABLE_DATA) {
return NULL;
}
//
// Be careful about pad size for alignment
//
return (UINT8 *) ((UINTN) GET_VARIABLE_NAME_PTR (Variable) + Variable->NameSize + GET_PAD_SIZE (Variable->NameSize));
}
/**
Gets pointer to header of the next variable.
This function gets the pointer to the next variable header according
to the input point to the variable header.
@param Variable Pointer to header of the next variable
@return Pointer to next variable header.
**/
VARIABLE_HEADER *
GetNextVariablePtr (
IN VARIABLE_HEADER *Variable
)
{
VARIABLE_HEADER *VarHeader;
if (Variable->StartId != VARIABLE_DATA) {
return NULL;
}
//
// Be careful about pad size for alignment
//
VarHeader = (VARIABLE_HEADER *) (GetVariableDataPtr (Variable) + Variable->DataSize + GET_PAD_SIZE (Variable->DataSize));
if (VarHeader->StartId != VARIABLE_DATA) {
return NULL;
}
return VarHeader;
}
/**
Gets 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 VolHeader Pointer to the variale store header
@return Pointer to the end of the variable storage area.
**/
VARIABLE_HEADER *
GetEndPointer (
IN VARIABLE_STORE_HEADER *VolHeader
)
{
//
// The end of variable store
//
return (VARIABLE_HEADER *) ((UINTN) VolHeader + VolHeader->Size);
}
/**
Routine used to track statistical information about variable usage.
The data is stored in the EFI system table so it can be accessed later.
VariableInfo.efi can dump out the table. Only Boot Services variable
accesses are tracked by this code. The PcdVariableCollectStatistics
build flag controls if this feature is enabled.
A read that hits in the cache will have Read and Cache true for
the transaction. Data is allocated by this routine, but never
freed.
@param[in] VariableName Name of the Variable to track
@param[in] VendorGuid Guid of the Variable to track
@param[in] Volatile TRUE if volatile FALSE if non-volatile
@param[in] Read TRUE if GetVariable() was called
@param[in] Write TRUE if SetVariable() was called
@param[in] Delete TRUE if deleted via SetVariable()
@param[in] Cache TRUE for a cache hit.
**/
VOID
UpdateVariableInfo (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN BOOLEAN Volatile,
IN BOOLEAN Read,
IN BOOLEAN Write,
IN BOOLEAN Delete,
IN BOOLEAN Cache
)
{
VARIABLE_INFO_ENTRY *Entry;
if (FeaturePcdGet (PcdVariableCollectStatistics)) {
if (EfiAtRuntime ()) {
// Don't collect statistics at runtime
return;
}
if (gVariableInfo == NULL) {
//
// on the first call allocate a entry and place a pointer to it in
// the EFI System Table
//
gVariableInfo = AllocateZeroPool (sizeof (VARIABLE_INFO_ENTRY));
ASSERT (gVariableInfo != NULL);
CopyGuid (&gVariableInfo->VendorGuid, VendorGuid);
gVariableInfo->Name = AllocatePool (StrSize (VariableName));
ASSERT (gVariableInfo->Name != NULL);
StrCpy (gVariableInfo->Name, VariableName);
gVariableInfo->Volatile = Volatile;
gBS->InstallConfigurationTable (&gEfiVariableGuid, gVariableInfo);
}
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 = AllocatePool (StrSize (VariableName));
ASSERT (Entry->Next->Name != NULL);
StrCpy (Entry->Next->Name, VariableName);
Entry->Next->Volatile = Volatile;
}
}
}
}
/**
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
EFIAPI
GetIndexFromSupportedLangCodes(
IN CHAR8 *SupportedLang,
IN CHAR8 *Lang,
IN BOOLEAN Iso639Language
)
{
UINTN Index;
UINT32 CompareLength;
CHAR8 *Supported;
Index = 0;
Supported = SupportedLang;
if (Iso639Language) {
CompareLength = 3;
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
//
while (*Supported != '\0') {
//
// take semicolon as delimitation, sequentially traverse supported language codes.
//
for (CompareLength = 0; *Supported != ';' && *Supported != '\0'; CompareLength++) {
Supported++;
}
if (AsciiStrnCmp (Lang, Supported - CompareLength, CompareLength) == 0) {
//
// Successfully find the index of Lang string in SupportedLang string.
//
return Index;
}
Index++;
}
ASSERT (FALSE);
return 0;
}
}
/**
Get language string from supported language codes according to index.
This code is used to get corresponding language string in supported language codes. It can handle
RFC4646 and ISO639 language tags.
In ISO639 language tags, take 3-characters as a delimitation. Find language string according to the index.
In RFC4646 language tags, take semicolon as a delimitation. Find language string according to the index.
For example:
SupportedLang = "engfraengfra"
Index = "1"
Iso639Language = TRUE
The return value is "fra".
Another example:
SupportedLang = "en;fr;en-US;fr-FR"
Index = "1"
Iso639Language = FALSE
The return value is "fr".
@param 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 *
EFIAPI
GetLangFromSupportedLangCodes (
IN CHAR8 *SupportedLang,
IN UINTN Index,
IN BOOLEAN Iso639Language
)
{
UINTN SubIndex;
UINT32 CompareLength;
CHAR8 *Supported;
SubIndex = 0;
Supported = SupportedLang;
if (Iso639Language) {
//
// according to the index of Lang string in SupportedLang string to get the language.
// As this code will be invoked in RUNTIME, therefore there is not memory allocate/free operation.
// In driver entry, it pre-allocates a runtime attribute memory to accommodate this string.
//
CompareLength = 3;
SetMem (mVariableModuleGlobal->Lang, sizeof(mVariableModuleGlobal->Lang), 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.
//
SetMem (mVariableModuleGlobal->PlatformLang, sizeof (mVariableModuleGlobal->PlatformLang), 0);
return CopyMem (mVariableModuleGlobal->PlatformLang, Supported - CompareLength, CompareLength);
}
SubIndex++;
}
}
}
/**
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 auto update operation is successful.
**/
EFI_STATUS
EFIAPI
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;
//
// 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, L"PlatformLangCodes") == 0) {
//
// 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.
//
AsciiStrnCpy (mVariableModuleGlobal->PlatformLangCodes, Data, DataSize);
} else if (StrCmp (VariableName, L"LangCodes") == 0) {
//
// 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.
//
AsciiStrnCpy (mVariableModuleGlobal->LangCodes, Data, DataSize);
} else if (StrCmp (VariableName, L"PlatformLang") == 0) {
ASSERT (AsciiStrLen (mVariableModuleGlobal->PlatformLangCodes) != 0);
//
// When setting PlatformLang, firstly get most matched language string from supported language codes.
//
BestPlatformLang = GetBestLanguage(mVariableModuleGlobal->PlatformLangCodes, FALSE, Data, 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);
//
// Successfully convert PlatformLang to Lang, and set the BestLang value into Lang variable simultaneously.
//
FindVariable(L"Lang", &gEfiGlobalVariableGuid, &Variable, (VARIABLE_GLOBAL *)mVariableModuleGlobal);
Status = UpdateVariable(L"Lang", &gEfiGlobalVariableGuid,
BestLang, ISO_639_2_ENTRY_SIZE + 1, Attributes, &Variable);
DEBUG((EFI_D_INFO, "Variable Driver Auto Update PlatformLang, PlatformLang:%a, Lang:%a\n", BestPlatformLang, BestLang));
ASSERT_EFI_ERROR(Status);
} else if (StrCmp (VariableName, L"Lang") == 0) {
ASSERT (AsciiStrLen (mVariableModuleGlobal->LangCodes) != 0);
//
// When setting Lang, firstly get most matched language string from supported language codes.
//
BestLang = GetBestLanguage(mVariableModuleGlobal->LangCodes, TRUE, Data, 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);
//
// Successfully convert Lang to PlatformLang, and set the BestPlatformLang value into PlatformLang variable simultaneously.
//
FindVariable(L"PlatformLang", &gEfiGlobalVariableGuid, &Variable, (VARIABLE_GLOBAL *)mVariableModuleGlobal);
Status = UpdateVariable(L"PlatformLang", &gEfiGlobalVariableGuid,
BestPlatformLang, AsciiStrSize (BestPlatformLang), Attributes, &Variable);
DEBUG((EFI_D_INFO, "Variable Driver Auto Update Lang, Lang:%a, PlatformLang:%a\n", BestLang, BestPlatformLang));
ASSERT_EFI_ERROR(Status);
}
return EFI_SUCCESS;
}
/**
Update the variable region with Variable information. These are the same
arguments as the EFI Variable services.
@param[in] VariableName Name of variable
@param[in] VendorGuid Guid of variable
@param[in] Data Variable data
@param[in] DataSize Size of data. 0 means delete
@param[in] Attributes Attribues of the variable
@param[in] Variable The variable information which is used to keep track of variable usage.
@retval EFI_SUCCESS The update operation is success.
@retval EFI_OUT_OF_RESOURCES Variable region is full, can not write other data into this region.
**/
EFI_STATUS
EFIAPI
UpdateVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN VOID *Data,
IN UINTN DataSize,
IN UINT32 Attributes OPTIONAL,
IN VARIABLE_POINTER_TRACK *Variable
)
{
EFI_STATUS Status;
VARIABLE_HEADER *NextVariable;
UINTN VarNameSize;
UINTN VarNameOffset;
UINTN VarDataOffset;
UINTN VarSize;
VARIABLE_GLOBAL *Global;
UINTN NonVolatileVarableStoreSize;
Global = &mVariableModuleGlobal->VariableGlobal[Physical];
if (Variable->CurrPtr != NULL) {
//
// Update/Delete existing variable
//
if (EfiAtRuntime ()) {
//
// If EfiAtRuntime and the variable is Volatile and Runtime Access,
// the volatile is ReadOnly, and SetVariable should be aborted and
// return EFI_WRITE_PROTECTED.
//
if (Variable->Volatile) {
Status = EFI_WRITE_PROTECTED;
goto Done;
}
//
// Only variable have NV attribute can be updated/deleted in Runtime
//
if ((Variable->CurrPtr->Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
Status = EFI_INVALID_PARAMETER;
goto Done;
}
}
//
// Setting a data variable with no access, or zero DataSize attributes
// specified causes it to be deleted.
//
if (DataSize == 0 || (Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0) {
Variable->CurrPtr->State &= VAR_DELETED;
UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, FALSE, TRUE, FALSE);
Status = EFI_SUCCESS;
goto Done;
}
//
// If the variable is marked valid and the same data has been passed in
// then return to the caller immediately.
//
if (Variable->CurrPtr->DataSize == DataSize &&
CompareMem (Data, GetVariableDataPtr (Variable->CurrPtr), DataSize) == 0
) {
Status = EFI_SUCCESS;
goto Done;
} else if (Variable->CurrPtr->State == VAR_ADDED) {
//
// Mark the old variable as in delete transition
//
Variable->CurrPtr->State &= VAR_IN_DELETED_TRANSITION;
}
} else {
//
// No found existing variable, Create a new variable
//
//
// Make sure we are trying to create a new variable.
// Setting a data variable with no access, or zero DataSize attributes means to delete it.
//
if (DataSize == 0 || (Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == 0) {
Status = EFI_NOT_FOUND;
goto Done;
}
//
// Only variable have NV|RT attribute can be created in Runtime
//
if (EfiAtRuntime () &&
(((Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0) || ((Attributes & EFI_VARIABLE_NON_VOLATILE) == 0))) {
Status = EFI_INVALID_PARAMETER;
goto Done;
}
}
//
// Function part - create a new variable and copy the data.
// Both update a variable and create a variable will come here.
//
VarNameOffset = sizeof (VARIABLE_HEADER);
VarNameSize = StrSize (VariableName);
VarDataOffset = VarNameOffset + VarNameSize + GET_PAD_SIZE (VarNameSize);
VarSize = VarDataOffset + DataSize + GET_PAD_SIZE (DataSize);
if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
NonVolatileVarableStoreSize = ((VARIABLE_STORE_HEADER *)(UINTN)(Global->NonVolatileVariableBase))->Size;
if ((((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0)
&& ((VarSize + mVariableModuleGlobal->HwErrVariableTotalSize) > FixedPcdGet32(PcdHwErrStorageSize)))
|| (((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == 0)
&& ((VarSize + mVariableModuleGlobal->CommonVariableTotalSize) > NonVolatileVarableStoreSize - sizeof (VARIABLE_STORE_HEADER) - FixedPcdGet32(PcdHwErrStorageSize)))) {
Status = EFI_OUT_OF_RESOURCES;
goto Done;
}
NextVariable = (VARIABLE_HEADER *) (UINT8 *) (mVariableModuleGlobal->NonVolatileLastVariableOffset
+ (UINTN) Global->NonVolatileVariableBase);
mVariableModuleGlobal->NonVolatileLastVariableOffset += VarSize;
if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) != 0) {
mVariableModuleGlobal->HwErrVariableTotalSize += VarSize;
} else {
mVariableModuleGlobal->CommonVariableTotalSize += VarSize;
}
} else {
if ((UINT32) (VarSize + mVariableModuleGlobal->VolatileLastVariableOffset) >
((VARIABLE_STORE_HEADER *) ((UINTN) (Global->VolatileVariableBase)))->Size
) {
Status = EFI_OUT_OF_RESOURCES;
goto Done;
}
NextVariable = (VARIABLE_HEADER *) (UINT8 *) (mVariableModuleGlobal->VolatileLastVariableOffset
+ (UINTN) Global->VolatileVariableBase);
mVariableModuleGlobal->VolatileLastVariableOffset += VarSize;
}
NextVariable->StartId = VARIABLE_DATA;
NextVariable->Attributes = Attributes;
NextVariable->State = VAR_ADDED;
NextVariable->Reserved = 0;
//
// There will be pad bytes after Data, the NextVariable->NameSize and
// NextVariable->NameSize should not include pad size so that variable
// service can get actual size in GetVariable
//
NextVariable->NameSize = (UINT32)VarNameSize;
NextVariable->DataSize = (UINT32)DataSize;
CopyMem (&NextVariable->VendorGuid, VendorGuid, sizeof (EFI_GUID));
CopyMem (
(UINT8 *) ((UINTN) NextVariable + VarNameOffset),
VariableName,
VarNameSize
);
CopyMem (
(UINT8 *) ((UINTN) NextVariable + VarDataOffset),
Data,
DataSize
);
//
// Mark the old variable as deleted
//
if (Variable->CurrPtr != NULL) {
Variable->CurrPtr->State &= VAR_DELETED;
}
UpdateVariableInfo (VariableName, VendorGuid, Variable->Volatile, FALSE, TRUE, FALSE, FALSE);
Status = EFI_SUCCESS;
Done:
return Status;
}
/**
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.
Otherwise, VariableName and VendorGuid are compared.
@param VariableName Name of the variable to be found.
@param VendorGuid Vendor GUID to be found.
@param PtrTrack VARIABLE_POINTER_TRACK structure for output,
including the range searched and the target position.
@param Global Pointer to VARIABLE_GLOBAL structure, including
base of volatile variable storage area, base of
NV variable storage area, and a lock.
@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
)
{
VARIABLE_HEADER *Variable[2];
VARIABLE_STORE_HEADER *VariableStoreHeader[2];
UINTN Index;
//
// 0: Non-Volatile, 1: Volatile
//
VariableStoreHeader[0] = (VARIABLE_STORE_HEADER *) ((UINTN) Global->NonVolatileVariableBase);
VariableStoreHeader[1] = (VARIABLE_STORE_HEADER *) ((UINTN) Global->VolatileVariableBase);
//
// Start Pointers for the variable.
// Actual Data Pointer where data can be written.
//
Variable[0] = (VARIABLE_HEADER *) (VariableStoreHeader[0] + 1);
Variable[1] = (VARIABLE_HEADER *) (VariableStoreHeader[1] + 1);
if (VariableName[0] != 0 && VendorGuid == NULL) {
return EFI_INVALID_PARAMETER;
}
//
// Find the variable by walk through non-volatile and volatile variable store
//
for (Index = 0; Index < 2; Index++) {
PtrTrack->StartPtr = (VARIABLE_HEADER *) (VariableStoreHeader[Index] + 1);
PtrTrack->EndPtr = GetEndPointer (VariableStoreHeader[Index]);
while ((Variable[Index] < GetEndPointer (VariableStoreHeader[Index])) && (Variable[Index] != NULL)) {
if (Variable[Index]->StartId == VARIABLE_DATA && Variable[Index]->State == VAR_ADDED) {
if (!(EfiAtRuntime () && ((Variable[Index]->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0))) {
if (VariableName[0] == 0) {
PtrTrack->CurrPtr = Variable[Index];
PtrTrack->Volatile = (BOOLEAN) Index;
return EFI_SUCCESS;
} else {
if (CompareGuid (VendorGuid, &Variable[Index]->VendorGuid)) {
if (CompareMem (VariableName, GET_VARIABLE_NAME_PTR (Variable[Index]), Variable[Index]->NameSize) == 0) {
PtrTrack->CurrPtr = Variable[Index];
PtrTrack->Volatile = (BOOLEAN) Index;
return EFI_SUCCESS;
}
}
}
}
}
Variable[Index] = GetNextVariablePtr (Variable[Index]);
}
}
PtrTrack->CurrPtr = NULL;
return EFI_NOT_FOUND;
}
/**
This code finds variable in storage blocks (Volatile or Non-Volatile).
@param VariableName A Null-terminated Unicode string that is the name of
the vendor's variable.
@param VendorGuid A unique identifier for the vendor.
@param Attributes If not NULL, a pointer to the memory location to return the
attributes bitmask for the variable.
@param DataSize Size of Data found. If size is less than the
data, this value contains the required size.
@param Data On input, the size in bytes of the return Data buffer.
On output, the size of data returned in Data.
@param Global Pointer to VARIABLE_GLOBAL structure
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The variable was not found.
@retval EFI_BUFFER_TOO_SMALL DataSize is too small for the result. DataSize has
been updated with the size needed to complete the request.
@retval EFI_INVALID_PARAMETER VariableName or VendorGuid or DataSize is NULL.
**/
EFI_STATUS
EFIAPI
EmuGetVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT UINT32 *Attributes OPTIONAL,
IN OUT UINTN *DataSize,
OUT VOID *Data,
IN VARIABLE_GLOBAL *Global
)
{
VARIABLE_POINTER_TRACK Variable;
UINTN VarDataSize;
EFI_STATUS Status;
if (VariableName == NULL || VendorGuid == NULL || DataSize == NULL) {
return EFI_INVALID_PARAMETER;
}
AcquireLockOnlyAtBootTime(&Global->VariableServicesLock);
//
// Find existing variable
//
Status = FindVariable (VariableName, VendorGuid, &Variable, Global);
if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
goto Done;
}
//
// Get data size
//
VarDataSize = Variable.CurrPtr->DataSize;
if (*DataSize >= VarDataSize) {
if (Data == NULL) {
Status = EFI_INVALID_PARAMETER;
goto Done;
}
CopyMem (Data, GetVariableDataPtr (Variable.CurrPtr), VarDataSize);
if (Attributes != NULL) {
*Attributes = Variable.CurrPtr->Attributes;
}
*DataSize = VarDataSize;
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 (&Global->VariableServicesLock);
return Status;
}
/**
This code Finds the Next available variable.
@param VariableNameSize Size of the variable.
@param VariableName On input, supplies the last VariableName that was returned by GetNextVariableName().
On output, returns the Null-terminated Unicode string of the current variable.
@param VendorGuid On input, supplies the last VendorGuid that was returned by GetNextVariableName().
On output, returns the VendorGuid of the current variable.
@param Global Pointer to VARIABLE_GLOBAL structure.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The next variable was not found.
@retval EFI_BUFFER_TOO_SMALL VariableNameSize is too small for the result.
VariableNameSize has been updated with the size needed to complete the request.
@retval EFI_INVALID_PARAMETER VariableNameSize or VariableName or VendorGuid is NULL.
**/
EFI_STATUS
EFIAPI
EmuGetNextVariableName (
IN OUT UINTN *VariableNameSize,
IN OUT CHAR16 *VariableName,
IN OUT EFI_GUID *VendorGuid,
IN VARIABLE_GLOBAL *Global
)
{
VARIABLE_POINTER_TRACK Variable;
UINTN VarNameSize;
EFI_STATUS Status;
if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {
return EFI_INVALID_PARAMETER;
}
AcquireLockOnlyAtBootTime(&Global->VariableServicesLock);
Status = FindVariable (VariableName, VendorGuid, &Variable, Global);
if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
goto Done;
}
while (TRUE) {
if (VariableName[0] != 0) {
//
// If variable name is not NULL, get next variable
//
Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr);
}
//
// If both volatile and non-volatile variable store are parsed,
// return not found
//
if (Variable.CurrPtr >= Variable.EndPtr || Variable.CurrPtr == NULL) {
Variable.Volatile = (BOOLEAN) (Variable.Volatile ^ ((BOOLEAN) 0x1));
if (Variable.Volatile) {
Variable.StartPtr = (VARIABLE_HEADER *) ((UINTN) (Global->VolatileVariableBase + sizeof (VARIABLE_STORE_HEADER)));
Variable.EndPtr = (VARIABLE_HEADER *) GetEndPointer ((VARIABLE_STORE_HEADER *) ((UINTN) Global->VolatileVariableBase));
} else {
Status = EFI_NOT_FOUND;
goto Done;
}
Variable.CurrPtr = Variable.StartPtr;
if (Variable.CurrPtr->StartId != VARIABLE_DATA) {
continue;
}
}
//
// Variable is found
//
if (Variable.CurrPtr->StartId == VARIABLE_DATA && Variable.CurrPtr->State == VAR_ADDED) {
if (!(EfiAtRuntime () && ((Variable.CurrPtr->Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0))) {
VarNameSize = Variable.CurrPtr->NameSize;
if (VarNameSize <= *VariableNameSize) {
CopyMem (
VariableName,
GET_VARIABLE_NAME_PTR (Variable.CurrPtr),
VarNameSize
);
CopyMem (
VendorGuid,
&Variable.CurrPtr->VendorGuid,
sizeof (EFI_GUID)
);
Status = EFI_SUCCESS;
} else {
Status = EFI_BUFFER_TOO_SMALL;
}
*VariableNameSize = VarNameSize;
goto Done;
}
}
}
Done:
ReleaseLockOnlyAtBootTime (&Global->VariableServicesLock);
return Status;
}
/**
This code sets variable in storage blocks (Volatile or Non-Volatile).
@param VariableName A Null-terminated Unicode string that is the name of the vendor's
variable. Each VariableName is unique for each
VendorGuid. VariableName must contain 1 or more
Unicode characters. If VariableName is an empty Unicode
string, then EFI_INVALID_PARAMETER is returned.
@param VendorGuid A unique identifier for the vendor
@param Attributes Attributes bitmask to set for the variable
@param DataSize The size in bytes of the Data buffer. A size of zero causes the
variable to be deleted.
@param Data The contents for the variable
@param Global Pointer to VARIABLE_GLOBAL structure
@param VolatileOffset The offset of last volatile variable
@param NonVolatileOffset The offset of last non-volatile variable
@retval EFI_SUCCESS The firmware has successfully stored the variable and its data as
defined by the Attributes.
@retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied, or the
DataSize exceeds the maximum allowed, or VariableName is an empty
Unicode string, or VendorGuid is NULL.
@retval EFI_OUT_OF_RESOURCES Not enough storage is available to hold the variable and its data.
@retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.
@retval EFI_WRITE_PROTECTED The variable in question is read-only or cannot be deleted.
@retval EFI_NOT_FOUND The variable trying to be updated or deleted was not found.
**/
EFI_STATUS
EFIAPI
EmuSetVariable (
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes,
IN UINTN DataSize,
IN VOID *Data,
IN VARIABLE_GLOBAL *Global,
IN UINTN *VolatileOffset,
IN UINTN *NonVolatileOffset
)
{
VARIABLE_POINTER_TRACK Variable;
EFI_STATUS Status;
//
// Check input parameters
//
if (VariableName == NULL || VariableName[0] == 0 || VendorGuid == NULL) {
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) {
return EFI_INVALID_PARAMETER;
}
//
// The size of the VariableName, including the Unicode Null in bytes plus
// the DataSize is limited to maximum size of FixedPcdGet32(PcdMaxHardwareErrorVariableSize)
// bytes for HwErrRec, and FixedPcdGet32(PcdMaxVariableSize) bytes for the others.
//
if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
if ((DataSize > FixedPcdGet32(PcdMaxHardwareErrorVariableSize)) ||
(sizeof (VARIABLE_HEADER) + StrSize (VariableName) + DataSize > FixedPcdGet32(PcdMaxHardwareErrorVariableSize))) {
return EFI_INVALID_PARAMETER;
}
//
// According to UEFI spec, HARDWARE_ERROR_RECORD variable name convention should be L"HwErrRecXXXX"
//
if (StrnCmp(VariableName, L"HwErrRec", StrLen(L"HwErrRec")) != 0) {
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 FixedPcdGet32(PcdMaxVariableSize) bytes.
//
if ((DataSize > FixedPcdGet32(PcdMaxVariableSize)) ||
(sizeof (VARIABLE_HEADER) + StrSize (VariableName) + DataSize > FixedPcdGet32(PcdMaxVariableSize))) {
return EFI_INVALID_PARAMETER;
}
}
AcquireLockOnlyAtBootTime(&Global->VariableServicesLock);
//
// Check whether the input variable is already existed
//
Status = FindVariable (VariableName, VendorGuid, &Variable, Global);
//
// Hook the operation of setting PlatformLangCodes/PlatformLang and LangCodes/Lang
//
AutoUpdateLangVariable (VariableName, Data, DataSize);
Status = UpdateVariable (VariableName, VendorGuid, Data, DataSize, Attributes, &Variable);
ReleaseLockOnlyAtBootTime (&Global->VariableServicesLock);
return Status;
}
/**
This code returns information about the EFI variables.
@param Attributes Attributes bitmask to specify the type of variables
on which to return information.
@param MaximumVariableStorageSize On output the maximum size of the storage space available for
the EFI variables associated with the attributes specified.
@param RemainingVariableStorageSize Returns the remaining size of the storage space available for EFI
variables associated with the attributes specified.
@param MaximumVariableSize Returns the maximum size of an individual EFI variable
associated with the attributes specified.
@param Global Pointer to VARIABLE_GLOBAL structure.
@retval EFI_SUCCESS Valid answer returned.
@retval EFI_INVALID_PARAMETER An invalid combination of attribute bits was supplied
@retval EFI_UNSUPPORTED The attribute is not supported on this platform, and the
MaximumVariableStorageSize, RemainingVariableStorageSize,
MaximumVariableSize are undefined.
**/
EFI_STATUS
EFIAPI
EmuQueryVariableInfo (
IN UINT32 Attributes,
OUT UINT64 *MaximumVariableStorageSize,
OUT UINT64 *RemainingVariableStorageSize,
OUT UINT64 *MaximumVariableSize,
IN VARIABLE_GLOBAL *Global
)
{
VARIABLE_HEADER *Variable;
VARIABLE_HEADER *NextVariable;
UINT64 VariableSize;
VARIABLE_STORE_HEADER *VariableStoreHeader;
UINT64 CommonVariableTotalSize;
UINT64 HwErrVariableTotalSize;
CommonVariableTotalSize = 0;
HwErrVariableTotalSize = 0;
if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {
return EFI_INVALID_PARAMETER;
}
if((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == 0) {
//
// Make sure the Attributes combination is supported by the platform.
//
return EFI_UNSUPPORTED;
} else if ((Attributes & (EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_BOOTSERVICE_ACCESS)) == EFI_VARIABLE_RUNTIME_ACCESS) {
//
// Make sure if runtime bit is set, boot service bit is set also.
//
return EFI_INVALID_PARAMETER;
} else if (EfiAtRuntime () && ((Attributes & EFI_VARIABLE_RUNTIME_ACCESS) == 0)) {
//
// Make sure RT Attribute is set if we are in Runtime phase.
//
return EFI_INVALID_PARAMETER;
} else if ((Attributes & (EFI_VARIABLE_NON_VOLATILE | EFI_VARIABLE_HARDWARE_ERROR_RECORD)) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
//
// Make sure Hw Attribute is set with NV.
//
return EFI_INVALID_PARAMETER;
}
AcquireLockOnlyAtBootTime(&Global->VariableServicesLock);
if((Attributes & EFI_VARIABLE_NON_VOLATILE) == 0) {
//
// Query is Volatile related.
//
VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) Global->VolatileVariableBase);
} else {
//
// Query is Non-Volatile related.
//
VariableStoreHeader = (VARIABLE_STORE_HEADER *) ((UINTN) Global->NonVolatileVariableBase);
}
//
// Now let's fill *MaximumVariableStorageSize *RemainingVariableStorageSize
// with the storage size (excluding the storage header size)
//
*MaximumVariableStorageSize = VariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER);
//
// 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 = FixedPcdGet32(PcdHwErrStorageSize);
*MaximumVariableSize = FixedPcdGet32(PcdMaxHardwareErrorVariableSize) - sizeof (VARIABLE_HEADER);
} else {
if ((Attributes & EFI_VARIABLE_NON_VOLATILE) != 0) {
ASSERT (FixedPcdGet32(PcdHwErrStorageSize) < VariableStoreHeader->Size);
*MaximumVariableStorageSize = VariableStoreHeader->Size - sizeof (VARIABLE_STORE_HEADER) - FixedPcdGet32(PcdHwErrStorageSize);
}
//
// Let *MaximumVariableSize be FixedPcdGet32(PcdMaxVariableSize) with the exception of the variable header size.
//
*MaximumVariableSize = FixedPcdGet32(PcdMaxVariableSize) - sizeof (VARIABLE_HEADER);
}
//
// Point to the starting address of the variables.
//
Variable = (VARIABLE_HEADER *) (VariableStoreHeader + 1);
//
// Now walk through the related variable store.
//
while (Variable < GetEndPointer (VariableStoreHeader)) {
NextVariable = GetNextVariablePtr(Variable);
if (NextVariable == NULL) {
break;
}
VariableSize = (UINT64) (UINTN) NextVariable - (UINT64) (UINTN) Variable;
if ((NextVariable->Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD) {
HwErrVariableTotalSize += VariableSize;
} else {
CommonVariableTotalSize += VariableSize;
}
//
// Go to the next one.
//
Variable = NextVariable;
}
if ((Attributes & EFI_VARIABLE_HARDWARE_ERROR_RECORD) == EFI_VARIABLE_HARDWARE_ERROR_RECORD){
*RemainingVariableStorageSize = *MaximumVariableStorageSize - HwErrVariableTotalSize;
} else {
*RemainingVariableStorageSize = *MaximumVariableStorageSize - CommonVariableTotalSize;
}
if (*RemainingVariableStorageSize < sizeof (VARIABLE_HEADER)) {
*MaximumVariableSize = 0;
} else if ((*RemainingVariableStorageSize - sizeof (VARIABLE_HEADER)) < *MaximumVariableSize) {
*MaximumVariableSize = *RemainingVariableStorageSize - sizeof (VARIABLE_HEADER);
}
ReleaseLockOnlyAtBootTime (&Global->VariableServicesLock);
return EFI_SUCCESS;
}
/**
Initializes variable store area.
This function allocates memory space for variable store area and initializes its attributes.
@param VariableBase Base of the variable store area created
@param LastVariableOffset Size of VARIABLE_STORE_HEADER
**/
EFI_STATUS
InitializeVariableStore (
OUT EFI_PHYSICAL_ADDRESS *VariableBase,
OUT UINTN *LastVariableOffset
)
{
VARIABLE_STORE_HEADER *VariableStore;
//
// Allocate memory for volatile variable store
//
VariableStore = (VARIABLE_STORE_HEADER *) AllocateRuntimePool (
FixedPcdGet32(PcdVariableStoreSize)
);
if (NULL == VariableStore) {
return EFI_OUT_OF_RESOURCES;
}
SetMem (VariableStore, FixedPcdGet32(PcdVariableStoreSize), 0xff);
//
// Variable Specific Data
//
*VariableBase = (EFI_PHYSICAL_ADDRESS) (UINTN) VariableStore;
*LastVariableOffset = sizeof (VARIABLE_STORE_HEADER);
CopyGuid (&VariableStore->Signature, &gEfiVariableGuid);
VariableStore->Size = FixedPcdGet32(PcdVariableStoreSize);
VariableStore->Format = VARIABLE_STORE_FORMATTED;
VariableStore->State = VARIABLE_STORE_HEALTHY;
VariableStore->Reserved = 0;
VariableStore->Reserved1 = 0;
return EFI_SUCCESS;
}
/**
Initializes variable store area for non-volatile and volatile variable.
This function allocates and initializes memory space for global context of ESAL
variable service and variable store area for non-volatile and volatile variable.
@param ImageHandle The Image handle of this driver.
@param SystemTable The pointer of EFI_SYSTEM_TABLE.
@retval EFI_SUCCESS Function successfully executed.
@retval EFI_OUT_OF_RESOURCES Fail to allocate enough memory resource.
**/
EFI_STATUS
EFIAPI
VariableCommonInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
//
// Allocate memory for mVariableModuleGlobal
//
mVariableModuleGlobal = (ESAL_VARIABLE_GLOBAL *) AllocateRuntimeZeroPool (
sizeof (ESAL_VARIABLE_GLOBAL)
);
if (NULL == mVariableModuleGlobal) {
return EFI_OUT_OF_RESOURCES;
}
EfiInitializeLock(&mVariableModuleGlobal->VariableGlobal[Physical].VariableServicesLock, TPL_NOTIFY);
//
// Intialize volatile variable store
//
Status = InitializeVariableStore (
&mVariableModuleGlobal->VariableGlobal[Physical].VolatileVariableBase,
&mVariableModuleGlobal->VolatileLastVariableOffset
);
if (EFI_ERROR (Status)) {
FreePool(mVariableModuleGlobal);
return Status;
}
//
// Intialize non volatile variable store
//
Status = InitializeVariableStore (
&mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase,
&mVariableModuleGlobal->NonVolatileLastVariableOffset
);
return Status;
}
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