Exemplo n.º 1
0
/**
  This function compares a variable with variable entries in database.

  @param  Variable      Pointer to the variable in our database
  @param  VariableName  Name of the variable to compare to 'Variable'
  @param  VendorGuid    GUID of the variable to compare to 'Variable'
  @param  PtrTrack      Variable Track Pointer structure that contains Variable Information.

  @retval EFI_SUCCESS    Found match variable
  @retval EFI_NOT_FOUND  Variable not found

**/
EFI_STATUS
CompareWithValidVariable (
    IN  VARIABLE_HEADER               *Variable,
    IN  CONST CHAR16                  *VariableName,
    IN  CONST EFI_GUID                *VendorGuid,
    OUT VARIABLE_POINTER_TRACK        *PtrTrack
)
{
    VOID  *Point;

    if (VariableName[0] == 0) {
        PtrTrack->CurrPtr = Variable;
        return EFI_SUCCESS;
    } else {
        //
        // Don't use CompareGuid function here for performance reasons.
        // Instead we compare the GUID a UINT32 at a time and branch
        // on the first failed comparison.
        //
        if ((((INT32 *) VendorGuid)[0] == ((INT32 *) &Variable->VendorGuid)[0]) &&
                (((INT32 *) VendorGuid)[1] == ((INT32 *) &Variable->VendorGuid)[1]) &&
                (((INT32 *) VendorGuid)[2] == ((INT32 *) &Variable->VendorGuid)[2]) &&
                (((INT32 *) VendorGuid)[3] == ((INT32 *) &Variable->VendorGuid)[3])
           ) {
            ASSERT (NameSizeOfVariable (Variable) != 0);
            Point = (VOID *) GetVariableNamePtr (Variable);
            if (CompareMem (VariableName, Point, NameSizeOfVariable (Variable)) == 0) {
                PtrTrack->CurrPtr = Variable;
                return EFI_SUCCESS;
            }
        }
    }

    return EFI_NOT_FOUND;
}
Exemplo n.º 2
0
/**
  This code gets the pointer to the variable data.

  @param   Variable  Pointer to the Variable Header.

  @return  A UINT8* 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;
}
Exemplo n.º 3
0
/**
  Finds next variable in storage blocks of volatile and non-volatile storage areas.

  This code finds next 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.

  @param[in]  VariableName          Name of the variable to be found.
  @param[in]  VendorGuid            Variable vendor GUID to be found.
  @param[out] AuthVariableInfo      Pointer to AUTH_VARIABLE_INFO structure for
                                    output of the next 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
EFIAPI
VariableExLibFindNextVariable (
  IN  CHAR16                *VariableName,
  IN  EFI_GUID              *VendorGuid,
  OUT AUTH_VARIABLE_INFO    *AuthVariableInfo
  )
{
  EFI_STATUS                    Status;
  VARIABLE_HEADER               *VariablePtr;
  AUTHENTICATED_VARIABLE_HEADER *AuthVariablePtr;

  Status = VariableServiceGetNextVariableInternal (
             VariableName,
             VendorGuid,
             &VariablePtr
             );
  if (EFI_ERROR (Status)) {
    AuthVariableInfo->VariableName = NULL;
    AuthVariableInfo->VendorGuid = NULL;
    AuthVariableInfo->Data = NULL;
    AuthVariableInfo->DataSize = 0;
    AuthVariableInfo->Attributes = 0;
    AuthVariableInfo->PubKeyIndex = 0;
    AuthVariableInfo->MonotonicCount = 0;
    AuthVariableInfo->TimeStamp = NULL;
    return Status;
  }

  AuthVariableInfo->VariableName    = GetVariableNamePtr (VariablePtr);
  AuthVariableInfo->VendorGuid      = GetVendorGuidPtr (VariablePtr);
  AuthVariableInfo->DataSize        = DataSizeOfVariable (VariablePtr);
  AuthVariableInfo->Data            = GetVariableDataPtr (VariablePtr);
  AuthVariableInfo->Attributes      = VariablePtr->Attributes;
  if (mVariableModuleGlobal->VariableGlobal.AuthFormat) {
    AuthVariablePtr = (AUTHENTICATED_VARIABLE_HEADER *) VariablePtr;
    AuthVariableInfo->PubKeyIndex     = AuthVariablePtr->PubKeyIndex;
    AuthVariableInfo->MonotonicCount  = AuthVariablePtr->MonotonicCount;
    AuthVariableInfo->TimeStamp       = &AuthVariablePtr->TimeStamp;
  }

  return EFI_SUCCESS;
}
Exemplo n.º 4
0
/**
  Return the next variable name and GUID.

  This function is called multiple times to retrieve the VariableName
  and VariableGuid of all variables currently available in the system.
  On each call, the previous results are passed into the interface,
  and, on return, the interface returns the data for the next
  interface. When the entire variable list has been returned,
  EFI_NOT_FOUND is returned.

  @param  This              A pointer to this instance of the EFI_PEI_READ_ONLY_VARIABLE2_PPI.

  @param  VariableNameSize  On entry, points to the size of the buffer pointed to by VariableName.
                            On return, the size of the variable name buffer.
  @param  VariableName      On entry, a pointer to a null-terminated string that is the variable's name.
                            On return, points to the next variable's null-terminated name string.
  @param  VariableGuid      On entry, a pointer to an EFI_GUID that is the variable's GUID.
                            On return, a pointer to the next variable's GUID.

  @retval EFI_SUCCESS           The variable was read successfully.
  @retval EFI_NOT_FOUND         The variable could not be found.
  @retval EFI_BUFFER_TOO_SMALL  The VariableNameSize is too small for the resulting
                                data. VariableNameSize is updated with the size
                                required for the specified variable.
  @retval EFI_INVALID_PARAMETER VariableName, VariableGuid or
                                VariableNameSize is NULL.
  @retval EFI_DEVICE_ERROR      The variable could not be retrieved because of a device error.

**/
EFI_STATUS
EFIAPI
PeiGetNextVariableName (
  IN CONST  EFI_PEI_READ_ONLY_VARIABLE2_PPI *This,
  IN OUT UINTN                              *VariableNameSize,
  IN OUT CHAR16                             *VariableName,
  IN OUT EFI_GUID                           *VariableGuid
  )
{
  VARIABLE_STORE_TYPE     Type;
  VARIABLE_POINTER_TRACK  Variable;
  VARIABLE_POINTER_TRACK  VariableInHob;
  VARIABLE_POINTER_TRACK  VariablePtrTrack;
  UINTN                   VarNameSize;
  EFI_STATUS              Status;
  VARIABLE_STORE_HEADER   *VariableStoreHeader[VariableStoreTypeMax];
  VARIABLE_HEADER         *VariableHeader;
  VARIABLE_STORE_INFO     StoreInfo;
  VARIABLE_STORE_INFO     StoreInfoForNv;
  VARIABLE_STORE_INFO     StoreInfoForHob;

  if (VariableName == NULL || VariableGuid == NULL || VariableNameSize == NULL) {
    return EFI_INVALID_PARAMETER;
  }

  VariableHeader = NULL;

  Status = FindVariable (VariableName, VariableGuid, &Variable, &StoreInfo);
  if (Variable.CurrPtr == NULL || Status != EFI_SUCCESS) {
    return Status;
  }

  if (VariableName[0] != 0) {
    //
    // If variable name is not NULL, get next variable
    //
    GetVariableHeader (&StoreInfo, Variable.CurrPtr, &VariableHeader);
    Variable.CurrPtr = GetNextVariablePtr (&StoreInfo, Variable.CurrPtr, VariableHeader);
  }

  VariableStoreHeader[VariableStoreTypeHob] = GetVariableStore (VariableStoreTypeHob, &StoreInfoForHob);
  VariableStoreHeader[VariableStoreTypeNv]  = GetVariableStore (VariableStoreTypeNv, &StoreInfoForNv);

  while (TRUE) {
    //
    // Switch from HOB to Non-Volatile.
    //
    while (!GetVariableHeader (&StoreInfo, Variable.CurrPtr, &VariableHeader)) {
      //
      // 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) {
        return EFI_NOT_FOUND;
      }
      Variable.StartPtr = GetStartPointer (VariableStoreHeader[Type]);
      Variable.EndPtr   = GetEndPointer   (VariableStoreHeader[Type]);
      Variable.CurrPtr  = Variable.StartPtr;
      GetVariableStore (Type, &StoreInfo);
    }

    if (VariableHeader->State == VAR_ADDED || VariableHeader->State == (VAR_IN_DELETED_TRANSITION & VAR_ADDED)) {
      if (VariableHeader->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.
        //
        Status = FindVariableEx (
                   &StoreInfo,
                   GetVariableNamePtr (Variable.CurrPtr, StoreInfo.AuthFlag),
                   GetVendorGuidPtr (VariableHeader, StoreInfo.AuthFlag),
                   &VariablePtrTrack
                   );
        if (!EFI_ERROR (Status) && VariablePtrTrack.CurrPtr != Variable.CurrPtr) {
          Variable.CurrPtr = GetNextVariablePtr (&StoreInfo, Variable.CurrPtr, VariableHeader);
          continue;
        }
      }

      //
      // Don't return NV variable when HOB overrides it
      //
      if ((VariableStoreHeader[VariableStoreTypeHob] != NULL) && (VariableStoreHeader[VariableStoreTypeNv] != NULL) &&
          (Variable.StartPtr == GetStartPointer (VariableStoreHeader[VariableStoreTypeNv]))
         ) {
        Status = FindVariableEx (
                   &StoreInfoForHob,
                   GetVariableNamePtr (Variable.CurrPtr, StoreInfo.AuthFlag),
                   GetVendorGuidPtr (VariableHeader, StoreInfo.AuthFlag),
                   &VariableInHob
                   );
        if (!EFI_ERROR (Status)) {
          Variable.CurrPtr = GetNextVariablePtr (&StoreInfo, Variable.CurrPtr, VariableHeader);
          continue;
        }
      }

      VarNameSize = NameSizeOfVariable (VariableHeader, StoreInfo.AuthFlag);
      ASSERT (VarNameSize != 0);

      if (VarNameSize <= *VariableNameSize) {
        GetVariableNameOrData (&StoreInfo, (UINT8 *) GetVariableNamePtr (Variable.CurrPtr, StoreInfo.AuthFlag), VarNameSize, (UINT8 *) VariableName);

        CopyMem (VariableGuid, GetVendorGuidPtr (VariableHeader, StoreInfo.AuthFlag), sizeof (EFI_GUID));

        Status = EFI_SUCCESS;
      } else {
        Status = EFI_BUFFER_TOO_SMALL;
      }

      *VariableNameSize = VarNameSize;
      //
      // Variable is found
      //
      return Status;
    } else {
      Variable.CurrPtr = GetNextVariablePtr (&StoreInfo, Variable.CurrPtr, VariableHeader);
    }
  }
}