ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/Sec/SecArmPlatformGlobalVariableLib.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011-2012, 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 <Uefi.h>
  16 #include <Library/ArmPlatformGlobalVariableLib.h>
  17 #include <Library/BaseLib.h>
  18 #include <Library/BaseMemoryLib.h>
  19 #include <Library/PcdLib.h>
  20 #include <Library/DebugLib.h>
  21
  22 VOID
  23 ArmPlatformGetGlobalVariable (
  24   IN  UINTN     VariableOffset,
  25   IN  UINTN     VariableSize,
  26   OUT VOID*     Variable
  27   )
  28 {
  29   UINTN  GlobalVariableBase;
  30
  31   // Ensure the Global Variable Size have been initialized
  32   ASSERT (VariableOffset < PcdGet32 (PcdSecGlobalVariableSize));
  33
  34   GlobalVariableBase = PcdGet32 (PcdCPUCoresSecStackBase) + PcdGet32 (PcdCPUCoreSecPrimaryStackSize) - PcdGet32 (PcdSecGlobalVariableSize) + VariableOffset;
  35
  36   if (VariableSize == 4) {
  37     *(UINT32*)Variable = ReadUnaligned32 ((CONST UINT32*)(GlobalVariableBase + VariableOffset));
  38   } else if (VariableSize == 8) {
  39     *(UINT64*)Variable = ReadUnaligned64 ((CONST UINT64*)(GlobalVariableBase + VariableOffset));
  40   } else {
  41     CopyMem (Variable, (VOID*)(GlobalVariableBase + VariableOffset), VariableSize);
  42   }
  43 }
  44
  45 VOID
  46 ArmPlatformSetGlobalVariable (
  47   IN  UINTN     VariableOffset,
  48   IN  UINTN     VariableSize,
  49   OUT VOID*     Variable
  50   )
  51 {
  52   UINTN  GlobalVariableBase;
  53
  54   // Ensure the Global Variable Size have been initialized
  55   ASSERT (VariableOffset < PcdGet32 (PcdSecGlobalVariableSize));
  56
  57   GlobalVariableBase = PcdGet32 (PcdCPUCoresSecStackBase) + PcdGet32 (PcdCPUCoreSecPrimaryStackSize) - PcdGet32 (PcdSecGlobalVariableSize) + VariableOffset;
  58
  59   if (VariableSize == 4) {
  60     WriteUnaligned32 ((UINT32*)(GlobalVariableBase + VariableOffset), *(UINT32*)Variable);
  61   } else if (VariableSize == 8) {
  62     WriteUnaligned64 ((UINT64*)(GlobalVariableBase + VariableOffset), *(UINT64*)Variable);
  63   } else {
  64     CopyMem ((VOID*)(GlobalVariableBase + VariableOffset), Variable, VariableSize);
  65   }
  66 }
  67
  68 VOID*
  69 ArmPlatformGetGlobalVariableAddress (
  70   IN  UINTN     VariableOffset
  71   )
  72 {
  73   UINTN  GlobalVariableBase;
  74
  75   // Ensure the Global Variable Size have been initialized
  76   ASSERT (VariableOffset < PcdGet32 (PcdSecGlobalVariableSize));
  77
  78   GlobalVariableBase = PcdGet32 (PcdCPUCoresSecStackBase) + PcdGet32 (PcdCPUCoreSecPrimaryStackSize) - PcdGet32 (PcdSecGlobalVariableSize);
  79
  80   return (VOID*)(GlobalVariableBase + VariableOffset);
  81 }