ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/PrePi/PrePiArmPlatformGlobalVariableLib.c

   1 /** @file
   2 *
   3 *  Copyright (c) 2011-2015, 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 extern UINT64 mSystemMemoryEnd;
  23
  24 #define IS_XIP() (((UINT32)PcdGet64 (PcdFdBaseAddress) > (UINT32)(mSystemMemoryEnd)) || \
  25                   ((PcdGet64 (PcdFdBaseAddress) + PcdGet32 (PcdFdSize)) < PcdGet64 (PcdSystemMemoryBase)))
  26
  27 // Declared by ArmPlatformPkg/PrePi Module
  28 extern UINTN mGlobalVariableBase;
  29
  30 VOID
  31 ArmPlatformGetGlobalVariable (
  32   IN  UINTN     VariableOffset,
  33   IN  UINTN     VariableSize,
  34   OUT VOID*     Variable
  35   )
  36 {
  37   UINTN  GlobalVariableBase;
  38
  39   // Ensure the Global Variable Size have been initialized
  40   ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));
  41
  42   if (IS_XIP()) {
  43     // In Case of XIP, we expect the Primary Stack at the top of the System Memory
  44     // The size must be 64bit aligned to allow 64bit variable to be aligned
  45     GlobalVariableBase = mSystemMemoryEnd + 1 - ALIGN_VALUE (PcdGet32 (PcdPeiGlobalVariableSize), 0x8);
  46   } else {
  47     GlobalVariableBase = mGlobalVariableBase;
  48   }
  49
  50   if (VariableSize == 4) {
  51     *(UINT32*)Variable = ReadUnaligned32 ((CONST UINT32*)(GlobalVariableBase + VariableOffset));
  52   } else if (VariableSize == 8) {
  53     *(UINT64*)Variable = ReadUnaligned64 ((CONST UINT64*)(GlobalVariableBase + VariableOffset));
  54   } else {
  55     CopyMem (Variable, (VOID*)(GlobalVariableBase + VariableOffset), VariableSize);
  56   }
  57 }
  58
  59 VOID
  60 ArmPlatformSetGlobalVariable (
  61   IN  UINTN     VariableOffset,
  62   IN  UINTN     VariableSize,
  63   OUT VOID*     Variable
  64   )
  65 {
  66   UINTN  GlobalVariableBase;
  67
  68   // Ensure the Global Variable Size have been initialized
  69   ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));
  70
  71   if (IS_XIP()) {
  72     // In Case of XIP, we expect the Primary Stack at the top of the System Memory
  73     // The size must be 64bit aligned to allow 64bit variable to be aligned
  74     GlobalVariableBase = mSystemMemoryEnd + 1 - ALIGN_VALUE (PcdGet32 (PcdPeiGlobalVariableSize), 0x8);
  75   } else {
  76     GlobalVariableBase = mGlobalVariableBase;
  77   }
  78
  79   if (VariableSize == 4) {
  80     WriteUnaligned32 ((UINT32*)(GlobalVariableBase + VariableOffset), *(UINT32*)Variable);
  81   } else if (VariableSize == 8) {
  82     WriteUnaligned64 ((UINT64*)(GlobalVariableBase + VariableOffset), *(UINT64*)Variable);
  83   } else {
  84     CopyMem ((VOID*)(GlobalVariableBase + VariableOffset), Variable, VariableSize);
  85   }
  86 }
  87
  88 VOID*
  89 ArmPlatformGetGlobalVariableAddress (
  90   IN  UINTN     VariableOffset
  91   )
  92 {
  93   UINTN  GlobalVariableBase;
  94
  95   // Ensure the Global Variable Size have been initialized
  96   ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));
  97
  98   if (IS_XIP()) {
  99     // In Case of XIP, we expect the Primary Stack at the top of the System Memory
 100     // The size must be 64bit aligned to allow 64bit variable to be aligned
 101     GlobalVariableBase = mSystemMemoryEnd + 1 - ALIGN_VALUE (PcdGet32 (PcdPeiGlobalVariableSize), 0x8);
 102   } else {
 103     GlobalVariableBase = mGlobalVariableBase;
 104   }
 105
 106   return (VOID*)(GlobalVariableBase + VariableOffset);
 107 }