MdePkg/Include/Library/UefiRuntimeServicesTableLib.h

   1 /** @file
   2   Provides a service to retrieve a pointer to the EFI Runtime Services Table.
   3
   4   This library does not contain any functions or macros.  It simply exports the
   5   global variable gRT that is a pointer to the EFI Runtime Services Table as defined
   6   in the UEFI Specification.  The global variable gRT must be preinitialized to NULL.
   7   The library constructor must set gRT to point at the EFI Runtime Services Table so
   8   it is available at the module's entry point. Since there is overhead in initializing
   9   this global variable, only those modules that actually require access to the EFI
  10   Runtime Services Table should use this library.
  11   Only available to DXE and UEFI module types.
  12
  13 Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR>
  14 SPDX-License-Identifier: BSD-2-Clause-Patent
  15
  16 **/
  17
  18 #ifndef __UEFI_RUNTIME_SERVICES_TABLE_LIB_H__
  19 #define __UEFI_RUNTIME_SERVICES_TABLE_LIB_H__
  20
  21 ///
  22 /// Cached copy of the EFI Runtime Services Table
  23 ///
  24 extern EFI_RUNTIME_SERVICES  *gRT;
  25
  26 #endif