diff options
Diffstat (limited to 'roms/edk2/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableParsing.c')
| -rw-r--r-- | roms/edk2/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableParsing.c | 788 |
1 files changed, 788 insertions, 0 deletions
diff --git a/roms/edk2/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableParsing.c b/roms/edk2/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableParsing.c new file mode 100644 index 000000000..f6d187543 --- /dev/null +++ b/roms/edk2/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableParsing.c @@ -0,0 +1,788 @@ +/** @file
+ Functions in this module are associated with variable parsing operations and
+ are intended to be usable across variable driver source files.
+
+Copyright (c) 2019, Intel Corporation. All rights reserved.<BR>
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include "VariableParsing.h"
+
+/**
+
+ This code checks if variable header is valid or not.
+
+ @param[in] Variable Pointer to the Variable Header.
+ @param[in] 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 code gets the current status of Variable Store.
+
+ @param[in] 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.
+
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @return Size of variable header in bytes in type UINTN.
+
+**/
+UINTN
+GetVariableHeaderSize (
+ IN BOOLEAN AuthFormat
+ )
+{
+ UINTN Value;
+
+ if (AuthFormat) {
+ Value = sizeof (AUTHENTICATED_VARIABLE_HEADER);
+ } else {
+ Value = sizeof (VARIABLE_HEADER);
+ }
+
+ return Value;
+}
+
+/**
+
+ This code gets the size of name of variable.
+
+ @param[in] Variable Pointer to the variable header.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @return UINTN Size of variable in bytes.
+
+**/
+UINTN
+NameSizeOfVariable (
+ IN VARIABLE_HEADER *Variable,
+ IN BOOLEAN AuthFormat
+ )
+{
+ AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
+
+ AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
+ if (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.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+**/
+VOID
+SetNameSizeOfVariable (
+ IN VARIABLE_HEADER *Variable,
+ IN UINTN NameSize,
+ IN BOOLEAN AuthFormat
+ )
+{
+ AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
+
+ AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
+ if (AuthFormat) {
+ AuthVariable->NameSize = (UINT32) NameSize;
+ } else {
+ Variable->NameSize = (UINT32) NameSize;
+ }
+}
+
+/**
+
+ This code gets the size of variable data.
+
+ @param[in] Variable Pointer to the Variable Header.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @return Size of variable in bytes.
+
+**/
+UINTN
+DataSizeOfVariable (
+ IN VARIABLE_HEADER *Variable,
+ IN BOOLEAN AuthFormat
+ )
+{
+ AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
+
+ AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
+ if (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.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+**/
+VOID
+SetDataSizeOfVariable (
+ IN VARIABLE_HEADER *Variable,
+ IN UINTN DataSize,
+ IN BOOLEAN AuthFormat
+ )
+{
+ AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
+
+ AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
+ if (AuthFormat) {
+ AuthVariable->DataSize = (UINT32) DataSize;
+ } else {
+ Variable->DataSize = (UINT32) DataSize;
+ }
+}
+
+/**
+
+ This code gets the pointer to the variable name.
+
+ @param[in] Variable Pointer to the Variable Header.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @return Pointer to Variable Name which is Unicode encoding.
+
+**/
+CHAR16 *
+GetVariableNamePtr (
+ IN VARIABLE_HEADER *Variable,
+ IN BOOLEAN AuthFormat
+ )
+{
+ return (CHAR16 *) ((UINTN) Variable + GetVariableHeaderSize (AuthFormat));
+}
+
+/**
+ This code gets the pointer to the variable guid.
+
+ @param[in] Variable Pointer to the Variable Header.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @return A EFI_GUID* pointer to Vendor Guid.
+
+**/
+EFI_GUID *
+GetVendorGuidPtr (
+ IN VARIABLE_HEADER *Variable,
+ IN BOOLEAN AuthFormat
+ )
+{
+ AUTHENTICATED_VARIABLE_HEADER *AuthVariable;
+
+ AuthVariable = (AUTHENTICATED_VARIABLE_HEADER *) Variable;
+ if (AuthFormat) {
+ return &AuthVariable->VendorGuid;
+ } else {
+ return &Variable->VendorGuid;
+ }
+}
+
+/**
+
+ This code gets the pointer to the variable data.
+
+ @param[in] Variable Pointer to the Variable Header.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @return Pointer to Variable Data.
+
+**/
+UINT8 *
+GetVariableDataPtr (
+ IN VARIABLE_HEADER *Variable,
+ IN BOOLEAN AuthFormat
+ )
+{
+ UINTN Value;
+
+ //
+ // Be careful about pad size for alignment.
+ //
+ Value = (UINTN) GetVariableNamePtr (Variable, AuthFormat);
+ Value += NameSizeOfVariable (Variable, AuthFormat);
+ Value += GET_PAD_SIZE (NameSizeOfVariable (Variable, AuthFormat));
+
+ return (UINT8 *) Value;
+}
+
+/**
+ This code gets the variable data offset related to variable header.
+
+ @param[in] Variable Pointer to the Variable Header.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @return Variable Data offset.
+
+**/
+UINTN
+GetVariableDataOffset (
+ IN VARIABLE_HEADER *Variable,
+ IN BOOLEAN AuthFormat
+ )
+{
+ UINTN Value;
+
+ //
+ // Be careful about pad size for alignment
+ //
+ Value = GetVariableHeaderSize (AuthFormat);
+ Value += NameSizeOfVariable (Variable, AuthFormat);
+ Value += GET_PAD_SIZE (NameSizeOfVariable (Variable, AuthFormat));
+
+ return Value;
+}
+
+/**
+
+ This code gets the pointer to the next variable header.
+
+ @param[in] Variable Pointer to the Variable Header.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @return Pointer to next variable header.
+
+**/
+VARIABLE_HEADER *
+GetNextVariablePtr (
+ IN VARIABLE_HEADER *Variable,
+ IN BOOLEAN AuthFormat
+ )
+{
+ UINTN Value;
+
+ Value = (UINTN) GetVariableDataPtr (Variable, AuthFormat);
+ Value += DataSizeOfVariable (Variable, AuthFormat);
+ Value += GET_PAD_SIZE (DataSizeOfVariable (Variable, AuthFormat));
+
+ //
+ // 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[in] VarStoreHeader Pointer to the Variable Store Header.
+
+ @return Pointer to the first variable header.
+
+**/
+VARIABLE_HEADER *
+GetStartPointer (
+ IN VARIABLE_STORE_HEADER *VarStoreHeader
+ )
+{
+ //
+ // The start 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[in] 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);
+}
+
+/**
+ Compare two EFI_TIME data.
+
+
+ @param[in] FirstTime A pointer to the first EFI_TIME data.
+ @param[in] 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);
+}
+
+/**
+ 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.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @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,
+ IN BOOLEAN AuthFormat
+ )
+{
+ 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, AuthFormat)
+ ) {
+ 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, AuthFormat))) {
+ Point = (VOID *) GetVariableNamePtr (PtrTrack->CurrPtr, AuthFormat);
+
+ ASSERT (NameSizeOfVariable (PtrTrack->CurrPtr, AuthFormat) != 0);
+ if (CompareMem (VariableName, Point, NameSizeOfVariable (PtrTrack->CurrPtr, AuthFormat)) == 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;
+}
+
+/**
+ 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[in] VariableStoreList A list of variable stores that should be used to get the next variable.
+ The maximum number of entries is the max value of VARIABLE_STORE_TYPE.
+ @param[out] VariablePtr Pointer to variable header address.
+ @param[in] AuthFormat TRUE indicates authenticated variables are used.
+ FALSE indicates authenticated variables are not used.
+
+ @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,
+ IN VARIABLE_STORE_HEADER **VariableStoreList,
+ OUT VARIABLE_HEADER **VariablePtr,
+ IN BOOLEAN AuthFormat
+ )
+{
+ EFI_STATUS Status;
+ VARIABLE_STORE_TYPE StoreType;
+ VARIABLE_POINTER_TRACK Variable;
+ VARIABLE_POINTER_TRACK VariableInHob;
+ VARIABLE_POINTER_TRACK VariablePtrTrack;
+
+ Status = EFI_NOT_FOUND;
+
+ if (VariableStoreList == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ ZeroMem (&Variable, sizeof (Variable));
+
+ // Check if the variable exists in the given variable store list
+ for (StoreType = (VARIABLE_STORE_TYPE) 0; StoreType < VariableStoreTypeMax; StoreType++) {
+ if (VariableStoreList[StoreType] == NULL) {
+ continue;
+ }
+
+ Variable.StartPtr = GetStartPointer (VariableStoreList[StoreType]);
+ Variable.EndPtr = GetEndPointer (VariableStoreList[StoreType]);
+ Variable.Volatile = (BOOLEAN) (StoreType == VariableStoreTypeVolatile);
+
+ Status = FindVariableEx (VariableName, VendorGuid, FALSE, &Variable, AuthFormat);
+ if (!EFI_ERROR (Status)) {
+ break;
+ }
+ }
+
+ if (Variable.CurrPtr == NULL || EFI_ERROR (Status)) {
+ //
+ // For VariableName is an empty string, FindVariableEx() will try to find and return
+ // the first qualified variable, and if FindVariableEx() 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 FindVariableEx() 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 empty, get next variable.
+ //
+ Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr, AuthFormat);
+ }
+
+ while (TRUE) {
+ //
+ // Switch to the next variable store if needed
+ //
+ while (!IsValidVariableHeader (Variable.CurrPtr, Variable.EndPtr)) {
+ //
+ // Find current storage index
+ //
+ for (StoreType = (VARIABLE_STORE_TYPE) 0; StoreType < VariableStoreTypeMax; StoreType++) {
+ if ((VariableStoreList[StoreType] != NULL) && (Variable.StartPtr == GetStartPointer (VariableStoreList[StoreType]))) {
+ break;
+ }
+ }
+ ASSERT (StoreType < VariableStoreTypeMax);
+ //
+ // Switch to next storage
+ //
+ for (StoreType++; StoreType < VariableStoreTypeMax; StoreType++) {
+ if (VariableStoreList[StoreType] != NULL) {
+ break;
+ }
+ }
+ //
+ // Capture the case that
+ // 1. current storage is the last one, or
+ // 2. no further storage
+ //
+ if (StoreType == VariableStoreTypeMax) {
+ Status = EFI_NOT_FOUND;
+ goto Done;
+ }
+ Variable.StartPtr = GetStartPointer (VariableStoreList[StoreType]);
+ Variable.EndPtr = GetEndPointer (VariableStoreList[StoreType]);
+ 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, AuthFormat),
+ GetVendorGuidPtr (Variable.CurrPtr, AuthFormat),
+ FALSE,
+ &VariablePtrTrack,
+ AuthFormat
+ );
+ if (!EFI_ERROR (Status) && VariablePtrTrack.CurrPtr->State == VAR_ADDED) {
+ Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr, AuthFormat);
+ continue;
+ }
+ }
+
+ //
+ // Don't return NV variable when HOB overrides it
+ //
+ if ((VariableStoreList[VariableStoreTypeHob] != NULL) && (VariableStoreList[VariableStoreTypeNv] != NULL) &&
+ (Variable.StartPtr == GetStartPointer (VariableStoreList[VariableStoreTypeNv]))
+ ) {
+ VariableInHob.StartPtr = GetStartPointer (VariableStoreList[VariableStoreTypeHob]);
+ VariableInHob.EndPtr = GetEndPointer (VariableStoreList[VariableStoreTypeHob]);
+ Status = FindVariableEx (
+ GetVariableNamePtr (Variable.CurrPtr, AuthFormat),
+ GetVendorGuidPtr (Variable.CurrPtr, AuthFormat),
+ FALSE,
+ &VariableInHob,
+ AuthFormat
+ );
+ if (!EFI_ERROR (Status)) {
+ Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr, AuthFormat);
+ continue;
+ }
+ }
+
+ *VariablePtr = Variable.CurrPtr;
+ Status = EFI_SUCCESS;
+ goto Done;
+ }
+ }
+
+ Variable.CurrPtr = GetNextVariablePtr (Variable.CurrPtr, AuthFormat);
+ }
+
+Done:
+ return Status;
+}
+
+/**
+ 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.
+ @param[in,out] VariableInfo Pointer to a pointer of VARIABLE_INFO_ENTRY structures.
+
+**/
+VOID
+UpdateVariableInfo (
+ IN CHAR16 *VariableName,
+ IN EFI_GUID *VendorGuid,
+ IN BOOLEAN Volatile,
+ IN BOOLEAN Read,
+ IN BOOLEAN Write,
+ IN BOOLEAN Delete,
+ IN BOOLEAN Cache,
+ IN OUT VARIABLE_INFO_ENTRY **VariableInfo
+ )
+{
+ VARIABLE_INFO_ENTRY *Entry;
+
+ if (FeaturePcdGet (PcdVariableCollectStatistics)) {
+ if (VariableName == NULL || VendorGuid == NULL || VariableInfo == NULL) {
+ return;
+ }
+ if (AtRuntime ()) {
+ // Don't collect statistics at runtime.
+ return;
+ }
+
+ if (*VariableInfo == NULL) {
+ //
+ // On the first call allocate a entry and place a pointer to it in
+ // the EFI System Table.
+ //
+ *VariableInfo = AllocateZeroPool (sizeof (VARIABLE_INFO_ENTRY));
+ ASSERT (*VariableInfo != NULL);
+
+ CopyGuid (&(*VariableInfo)->VendorGuid, VendorGuid);
+ (*VariableInfo)->Name = AllocateZeroPool (StrSize (VariableName));
+ ASSERT ((*VariableInfo)->Name != NULL);
+ StrCpyS ((*VariableInfo)->Name, StrSize(VariableName)/sizeof(CHAR16), VariableName);
+ (*VariableInfo)->Volatile = Volatile;
+ }
+
+
+ for (Entry = (*VariableInfo); 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;
+ }
+ }
+ }
+}
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