MdeModulePkg Variable: Minor update to the Data parameter for GetVariable()

[mirror_edk2.git] / MdeModulePkg / Universal / Variable / EmuRuntimeDxe / InitVariable.c

/** @file\r
\r
  Implment all four UEFI runtime variable services and \r
  install variable architeture protocol.\r
  \r
Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "Variable.h"\r
\r
EFI_EVENT   mVirtualAddressChangeEvent = NULL;\r
\r
/**\r
\r
  This code finds variable in storage blocks (Volatile or Non-Volatile).\r
\r
  @param VariableName               Name of Variable to be found.\r
  @param VendorGuid                 Variable vendor GUID.\r
  @param Attributes                 Attribute value of the variable found.\r
  @param DataSize                   Size of Data found. If size is less than the\r
                                    data, this value contains the required size.\r
  @param Data                       The buffer to return the contents of the variable. May be NULL\r
                                    with a zero DataSize in order to determine the size buffer needed.\r
                      \r
  @return EFI_INVALID_PARAMETER     Invalid parameter\r
  @return EFI_SUCCESS               Find the specified variable\r
  @return EFI_NOT_FOUND             Not found\r
  @return EFI_BUFFER_TO_SMALL       DataSize is too small for the result\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
RuntimeServiceGetVariable (\r
  IN CHAR16        *VariableName,\r
  IN EFI_GUID      *VendorGuid,\r
  OUT UINT32       *Attributes OPTIONAL,\r
  IN OUT UINTN     *DataSize,\r
  OUT VOID         *Data OPTIONAL\r
  )\r
{\r
  return EmuGetVariable (\r
          VariableName,\r
          VendorGuid,\r
          Attributes OPTIONAL,\r
          DataSize,\r
          Data,\r
          &mVariableModuleGlobal->VariableGlobal[Physical]\r
          );\r
}\r
\r
/**\r
\r
  This code Finds the Next available variable.\r
\r
  @param VariableNameSize           Size of the variable name\r
  @param VariableName               Pointer to variable name\r
  @param VendorGuid                 Variable Vendor Guid\r
\r
  @return EFI_INVALID_PARAMETER     Invalid parameter\r
  @return EFI_SUCCESS               Find the specified variable\r
  @return EFI_NOT_FOUND             Not found\r
  @return EFI_BUFFER_TO_SMALL       DataSize is too small for the result\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
RuntimeServiceGetNextVariableName (\r
  IN OUT UINTN     *VariableNameSize,\r
  IN OUT CHAR16    *VariableName,\r
  IN OUT EFI_GUID  *VendorGuid\r
  )\r
{\r
  return EmuGetNextVariableName (\r
          VariableNameSize,\r
          VariableName,\r
          VendorGuid,\r
          &mVariableModuleGlobal->VariableGlobal[Physical]\r
          );\r
}\r
\r
/**\r
\r
  This code sets variable in storage blocks (Volatile or Non-Volatile).\r
\r
  @param VariableName                     Name of Variable to be found\r
  @param VendorGuid                       Variable vendor GUID\r
  @param Attributes                       Attribute value of the variable found\r
  @param DataSize                         Size of Data found. If size is less than the\r
                                          data, this value contains the required size.\r
  @param Data                             Data pointer\r
\r
  @return EFI_INVALID_PARAMETER           Invalid parameter\r
  @return EFI_SUCCESS                     Set successfully\r
  @return EFI_OUT_OF_RESOURCES            Resource not enough to set variable\r
  @return EFI_NOT_FOUND                   Not found\r
  @return EFI_WRITE_PROTECTED             Variable is read-only\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
RuntimeServiceSetVariable (\r
  IN CHAR16        *VariableName,\r
  IN EFI_GUID      *VendorGuid,\r
  IN UINT32        Attributes,\r
  IN UINTN         DataSize,\r
  IN VOID          *Data\r
  )\r
{\r
  return EmuSetVariable (\r
          VariableName,\r
          VendorGuid,\r
          Attributes,\r
          DataSize,\r
          Data,\r
          &mVariableModuleGlobal->VariableGlobal[Physical],\r
          &mVariableModuleGlobal->VolatileLastVariableOffset,\r
          &mVariableModuleGlobal->NonVolatileLastVariableOffset\r
          );\r
}\r
\r
/**\r
\r
  This code returns information about the EFI variables.\r
\r
  @param Attributes                     Attributes bitmask to specify the type of variables\r
                                        on which to return information.\r
  @param MaximumVariableStorageSize     Pointer to the maximum size of the storage space available\r
                                        for the EFI variables associated with the attributes specified.\r
  @param RemainingVariableStorageSize   Pointer to the remaining size of the storage space available\r
                                        for EFI variables associated with the attributes specified.\r
  @param MaximumVariableSize            Pointer to the maximum size of an individual EFI variables\r
                                        associated with the attributes specified.\r
\r
  @return EFI_INVALID_PARAMETER         An invalid combination of attribute bits was supplied.\r
  @return EFI_SUCCESS                   Query successfully.\r
  @return EFI_UNSUPPORTED               The attribute is not supported on this platform.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
RuntimeServiceQueryVariableInfo (\r
  IN  UINT32                 Attributes,\r
  OUT UINT64                 *MaximumVariableStorageSize,\r
  OUT UINT64                 *RemainingVariableStorageSize,\r
  OUT UINT64                 *MaximumVariableSize\r
  )\r
{\r
  return EmuQueryVariableInfo (\r
          Attributes,\r
          MaximumVariableStorageSize,\r
          RemainingVariableStorageSize,\r
          MaximumVariableSize,\r
          &mVariableModuleGlobal->VariableGlobal[Physical]\r
          );\r
}\r
\r
/**\r
  Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.\r
\r
  This is a notification function registered on EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r
  It convers pointer to new virtual address.\r
\r
  @param  Event        Event whose notification function is being invoked.\r
  @param  Context      Pointer to the notification function's context.\r
\r
**/\r
VOID\r
EFIAPI\r
VariableClassAddressChangeEvent (\r
  IN EFI_EVENT        Event,\r
  IN VOID             *Context\r
  )\r
{\r
  EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->PlatformLangCodes);\r
  EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->LangCodes);\r
  EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal->PlatformLang);\r
  EfiConvertPointer (\r
    0x0,\r
    (VOID **) &mVariableModuleGlobal->VariableGlobal[Physical].NonVolatileVariableBase\r
    );\r
  EfiConvertPointer (\r
    0x0,\r
    (VOID **) &mVariableModuleGlobal->VariableGlobal[Physical].VolatileVariableBase\r
    );\r
  EfiConvertPointer (0x0, (VOID **) &mVariableModuleGlobal);\r
}\r
\r
/**\r
  EmuVariable Driver main entry point. The Variable driver places the 4 EFI\r
  runtime services in the EFI System Table and installs arch protocols \r
  for variable read and write services being available. It also registers\r
  notification function for EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE event.\r
\r
  @param[in] ImageHandle    The firmware allocated handle for the EFI image.  \r
  @param[in] SystemTable    A pointer to the EFI System Table.\r
  \r
  @retval EFI_SUCCESS       Variable service successfully initialized.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
VariableServiceInitialize (\r
  IN EFI_HANDLE         ImageHandle,\r
  IN EFI_SYSTEM_TABLE   *SystemTable\r
  )\r
{\r
  EFI_HANDLE  NewHandle;\r
  EFI_STATUS  Status;\r
\r
  Status = VariableCommonInitialize (ImageHandle, SystemTable);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  SystemTable->RuntimeServices->GetVariable         = RuntimeServiceGetVariable;\r
  SystemTable->RuntimeServices->GetNextVariableName = RuntimeServiceGetNextVariableName;\r
  SystemTable->RuntimeServices->SetVariable         = RuntimeServiceSetVariable;\r
  SystemTable->RuntimeServices->QueryVariableInfo   = RuntimeServiceQueryVariableInfo;\r
\r
  //\r
  // Now install the Variable Runtime Architectural Protocol on a new handle\r
  //\r
  NewHandle = NULL;\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &NewHandle,\r
                  &gEfiVariableArchProtocolGuid,\r
                  NULL,\r
                  &gEfiVariableWriteArchProtocolGuid,\r
                  NULL,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  Status = gBS->CreateEventEx (\r
                  EVT_NOTIFY_SIGNAL,\r
                  TPL_NOTIFY,\r
                  VariableClassAddressChangeEvent,\r
                  NULL,\r
                  &gEfiEventVirtualAddressChangeGuid,\r
                  &mVirtualAddressChangeEvent\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  return EFI_SUCCESS;\r
}\r