ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/PrePi/PrePiArmPlatformGlobalVariableLib.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 #define IS_XIP() (((UINT32)PcdGet32 (PcdFdBaseAddress) > (UINT32)(PcdGet32 (PcdSystemMemoryBase) + PcdGet32 (PcdSystemMemorySize))) || \
  23                   ((PcdGet32 (PcdFdBaseAddress) + PcdGet32 (PcdFdSize)) < PcdGet32 (PcdSystemMemoryBase)))
  24
  25 // Declared by ArmPlatformPkg/PrePi Module
  26 extern UINTN mGlobalVariableBase;
  27
  28 VOID
  29 ArmPlatformGetGlobalVariable (
  30   IN  UINTN     VariableOffset,
  31   IN  UINTN     VariableSize,
  32   OUT VOID*     Variable
  33   )
  34 {
  35   UINTN  GlobalVariableBase;
  36
  37   // Ensure the Global Variable Size have been initialized
  38   ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));
  39
  40   if (IS_XIP()) {
  41     // In Case of XIP, we expect the Primary Stack at the top of the System Memory
  42     // The size must be 64bit aligned to allow 64bit variable to be aligned
  43     GlobalVariableBase = PcdGet32 (PcdSystemMemoryBase) + PcdGet32 (PcdSystemMemorySize) - ALIGN_VALUE(PcdGet32 (PcdPeiGlobalVariableSize),0x8);
  44   } else {
  45     GlobalVariableBase = mGlobalVariableBase;
  46   }
  47
  48   if (VariableSize == 4) {
  49     *(UINT32*)Variable = ReadUnaligned32 ((CONST UINT32*)(GlobalVariableBase + VariableOffset));
  50   } else if (VariableSize == 8) {
  51     *(UINT64*)Variable = ReadUnaligned64 ((CONST UINT64*)(GlobalVariableBase + VariableOffset));
  52   } else {
  53     CopyMem (Variable, (VOID*)(GlobalVariableBase + VariableOffset), VariableSize);
  54   }
  55 }
  56
  57 VOID
  58 ArmPlatformSetGlobalVariable (
  59   IN  UINTN     VariableOffset,
  60   IN  UINTN     VariableSize,
  61   OUT VOID*     Variable
  62   )
  63 {
  64   UINTN  GlobalVariableBase;
  65
  66   // Ensure the Global Variable Size have been initialized
  67   ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));
  68
  69   if (IS_XIP()) {
  70     // In Case of XIP, we expect the Primary Stack at the top of the System Memory
  71     // The size must be 64bit aligned to allow 64bit variable to be aligned
  72     GlobalVariableBase = PcdGet32 (PcdSystemMemoryBase) + PcdGet32 (PcdSystemMemorySize) - ALIGN_VALUE(PcdGet32 (PcdPeiGlobalVariableSize),0x8);
  73   } else {
  74     GlobalVariableBase = mGlobalVariableBase;
  75   }
  76
  77   if (VariableSize == 4) {
  78     WriteUnaligned32 ((UINT32*)(GlobalVariableBase + VariableOffset), *(UINT32*)Variable);
  79   } else if (VariableSize == 8) {
  80     WriteUnaligned64 ((UINT64*)(GlobalVariableBase + VariableOffset), *(UINT64*)Variable);
  81   } else {
  82     CopyMem ((VOID*)(GlobalVariableBase + VariableOffset), Variable, VariableSize);
  83   }
  84 }
  85