ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/PrePi/PrePiArmPlatformGlobalVariableLib.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 <Uefi.h>
  16 #include <Library/ArmPlatformGlobalVariableLib.h>
  17 #include <Library/BaseLib.h>
  18 #include <Library/BaseMemoryLib.h>
  19 #include <Library/PcdLib.h>
  20
  21 #define IS_XIP() ((PcdGet32 (PcdFdBaseAddress) > (PcdGet32 (PcdSystemMemoryBase) + PcdGet32 (PcdSystemMemorySize))) || \
  22                   ((PcdGet32 (PcdFdBaseAddress) + PcdGet32 (PcdFdSize)) < PcdGet32 (PcdSystemMemoryBase)))
  23
  24 // Declared by ArmPlatformPkg/PrePi Module
  25 extern UINTN mGlobalVariableBase;
  26
  27 VOID
  28 ArmPlatformGetGlobalVariable (
  29   IN  UINTN     VariableOffset,
  30   IN  UINTN     VariableSize,
  31   OUT VOID*     Variable
  32   )
  33 {
  34   UINTN  GlobalVariableBase;
  35
  36   if (IS_XIP()) {
  37     // In Case of XIP, we expect the Primary Stack at the top of the System Memory
  38     GlobalVariableBase = PcdGet32 (PcdSystemMemoryBase) + PcdGet32 (PcdSystemMemorySize) - PcdGet32 (PcdPeiGlobalVariableSize);
  39   } else {
  40     GlobalVariableBase = mGlobalVariableBase;
  41   }
  42
  43   if (VariableSize == 4) {
  44     *(UINT32*)Variable = ReadUnaligned32 ((CONST UINT32*)(GlobalVariableBase + VariableOffset));
  45   } else if (VariableSize == 8) {
  46     *(UINT32*)Variable = ReadUnaligned64 ((CONST UINT64*)(GlobalVariableBase + VariableOffset));
  47   } else {
  48     CopyMem (Variable, (VOID*)(GlobalVariableBase + VariableOffset), VariableSize);
  49   }
  50 }
  51
  52 VOID
  53 ArmPlatformSetGlobalVariable (
  54   IN  UINTN     VariableOffset,
  55   IN  UINTN     VariableSize,
  56   OUT VOID*     Variable
  57   )
  58 {
  59   UINTN  GlobalVariableBase;
  60
  61   if (IS_XIP()) {
  62     // In Case of XIP, we expect the Primary Stack at the top of the System Memory
  63     GlobalVariableBase = PcdGet32 (PcdSystemMemoryBase) + PcdGet32 (PcdSystemMemorySize) - PcdGet32 (PcdPeiGlobalVariableSize);
  64   } else {
  65     GlobalVariableBase = mGlobalVariableBase;
  66   }
  67
  68   if (VariableSize == 4) {
  69     WriteUnaligned32 ((UINT32*)(GlobalVariableBase + VariableOffset), *(UINT32*)Variable);
  70   } else if (VariableSize == 8) {
  71     WriteUnaligned64 ((UINT64*)(GlobalVariableBase + VariableOffset), *(UINT64*)Variable);
  72   } else {
  73     CopyMem ((VOID*)(GlobalVariableBase + VariableOffset), Variable, VariableSize);
  74   }
  75 }
  76