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() (((UINT32)PcdGet32 (PcdFdBaseAddress) > (UINT32)(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     // The size must be 64bit aligned to allow 64bit variable to be aligned
  39     GlobalVariableBase = PcdGet32 (PcdSystemMemoryBase) + PcdGet32 (PcdSystemMemorySize) - ALIGN_VALUE(PcdGet32 (PcdPeiGlobalVariableSize),0x8);
  40   } else {
  41     GlobalVariableBase = mGlobalVariableBase;
  42   }
  43
  44   if (VariableSize == 4) {
  45     *(UINT32*)Variable = ReadUnaligned32 ((CONST UINT32*)(GlobalVariableBase + VariableOffset));
  46   } else if (VariableSize == 8) {
  47     *(UINT32*)Variable = ReadUnaligned64 ((CONST UINT64*)(GlobalVariableBase + VariableOffset));
  48   } else {
  49     CopyMem (Variable, (VOID*)(GlobalVariableBase + VariableOffset), VariableSize);
  50   }
  51 }
  52
  53 VOID
  54 ArmPlatformSetGlobalVariable (
  55   IN  UINTN     VariableOffset,
  56   IN  UINTN     VariableSize,
  57   OUT VOID*     Variable
  58   )
  59 {
  60   UINTN  GlobalVariableBase;
  61
  62   if (IS_XIP()) {
  63     // In Case of XIP, we expect the Primary Stack at the top of the System Memory
  64     // The size must be 64bit aligned to allow 64bit variable to be aligned
  65     GlobalVariableBase = PcdGet32 (PcdSystemMemoryBase) + PcdGet32 (PcdSystemMemorySize) - ALIGN_VALUE(PcdGet32 (PcdPeiGlobalVariableSize),0x8);
  66   } else {
  67     GlobalVariableBase = mGlobalVariableBase;
  68   }
  69
  70   if (VariableSize == 4) {
  71     WriteUnaligned32 ((UINT32*)(GlobalVariableBase + VariableOffset), *(UINT32*)Variable);
  72   } else if (VariableSize == 8) {
  73     WriteUnaligned64 ((UINT64*)(GlobalVariableBase + VariableOffset), *(UINT64*)Variable);
  74   } else {
  75     CopyMem ((VOID*)(GlobalVariableBase + VariableOffset), Variable, VariableSize);
  76   }
  77 }
  78