ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/Dxe/DxeArmPlatformGlobalVariableLib.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011, ARM Limited. All rights reserved.
   4 *
   5 *  This program and the accompanying materials
   6 *  are licensed and made available under the terms and conditions of the BSD License
   7 *  which accompanies this distribution.  The full text of the license may be found at
   8 *  http://opensource.org/licenses/bsd-license.php
   9 *
  10 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12 *
  13 **/
  14
  15 #include <PiDxe.h>
  16 #include <Library/ArmPlatformGlobalVariableLib.h>
  17 #include <Library/BaseMemoryLib.h>
  18 #include <Library/DebugLib.h>
  19 #include <Library/HobLib.h>
  20 #include <Library/PcdLib.h>
  21
  22 #include <Guid/ArmGlobalVariableHob.h>
  23
  24 UINTN  mGlobalVariableBase = 0;
  25
  26 RETURN_STATUS
  27 EFIAPI
  28 ArmPlatformGlobalVariableConstructor (
  29   VOID
  30   )
  31 {
  32   ARM_HOB_GLOBAL_VARIABLE  *Hob;
  33
  34   Hob = GetFirstGuidHob (&gArmGlobalVariableGuid);
  35   ASSERT (Hob != NULL);
  36
  37   mGlobalVariableBase = Hob->GlobalVariableBase;
  38
  39   return EFI_SUCCESS;
  40 }
  41
  42 VOID
  43 ArmPlatformGetGlobalVariable (
  44   IN  UINTN     VariableOffset,
  45   IN  UINTN     VariableSize,
  46   OUT VOID*     Variable
  47   )
  48 {
  49   if (mGlobalVariableBase == 0) {
  50     ArmPlatformGlobalVariableConstructor ();
  51   }
  52
  53   CopyMem (Variable, (VOID*)(mGlobalVariableBase + VariableOffset), VariableSize);
  54 }
  55
  56 VOID
  57 ArmPlatformSetGlobalVariable (
  58   IN  UINTN     VariableOffset,
  59   IN  UINTN     VariableSize,
  60   OUT VOID*     Variable
  61   )
  62 {
  63   if (mGlobalVariableBase == 0) {
  64     ArmPlatformGlobalVariableConstructor ();
  65   }
  66
  67   CopyMem ((VOID*)(mGlobalVariableBase + VariableOffset), Variable, VariableSize);
  68 }
  69