ArmPlatformPkg/PrePi: Make dynamic the top of the System Memory

[mirror_edk2.git] / ArmPlatformPkg / Library / ArmPlatformGlobalVariableLib / PrePi / PrePiArmPlatformGlobalVariableLib.c

/** @file\r
*\r
*  Copyright (c) 2011-2015, ARM Limited. All rights reserved.\r
*\r
*  This program and the accompanying materials\r
*  are licensed and made available under the terms and conditions of the BSD License\r
*  which accompanies this distribution.  The full text of the license may be found at\r
*  http://opensource.org/licenses/bsd-license.php\r
*\r
*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
*\r
**/\r
\r
#include <Uefi.h>\r
#include <Library/ArmPlatformGlobalVariableLib.h>\r
#include <Library/BaseLib.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/PcdLib.h>\r
#include <Library/DebugLib.h>\r
\r
extern UINT64 mSystemMemoryEnd;\r
\r
#define IS_XIP() (((UINT32)PcdGet64 (PcdFdBaseAddress) > (UINT32)(mSystemMemoryEnd)) || \\r
                  ((PcdGet64 (PcdFdBaseAddress) + PcdGet32 (PcdFdSize)) < PcdGet64 (PcdSystemMemoryBase)))\r
\r
// Declared by ArmPlatformPkg/PrePi Module\r
extern UINTN mGlobalVariableBase;\r
\r
VOID\r
ArmPlatformGetGlobalVariable (\r
  IN  UINTN     VariableOffset,\r
  IN  UINTN     VariableSize,\r
  OUT VOID*     Variable\r
  )\r
{\r
  UINTN  GlobalVariableBase;\r
\r
  // Ensure the Global Variable Size have been initialized\r
  ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));\r
\r
  if (IS_XIP()) {\r
    // In Case of XIP, we expect the Primary Stack at the top of the System Memory\r
    // The size must be 64bit aligned to allow 64bit variable to be aligned\r
    GlobalVariableBase = mSystemMemoryEnd + 1 - ALIGN_VALUE (PcdGet32 (PcdPeiGlobalVariableSize), 0x8);\r
  } else {\r
    GlobalVariableBase = mGlobalVariableBase;\r
  }\r
\r
  if (VariableSize == 4) {\r
    *(UINT32*)Variable = ReadUnaligned32 ((CONST UINT32*)(GlobalVariableBase + VariableOffset));\r
  } else if (VariableSize == 8) {\r
    *(UINT64*)Variable = ReadUnaligned64 ((CONST UINT64*)(GlobalVariableBase + VariableOffset));\r
  } else {\r
    CopyMem (Variable, (VOID*)(GlobalVariableBase + VariableOffset), VariableSize);\r
  }\r
}\r
\r
VOID\r
ArmPlatformSetGlobalVariable (\r
  IN  UINTN     VariableOffset,\r
  IN  UINTN     VariableSize,\r
  OUT VOID*     Variable\r
  )\r
{\r
  UINTN  GlobalVariableBase;\r
\r
  // Ensure the Global Variable Size have been initialized\r
  ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));\r
\r
  if (IS_XIP()) {\r
    // In Case of XIP, we expect the Primary Stack at the top of the System Memory\r
    // The size must be 64bit aligned to allow 64bit variable to be aligned\r
    GlobalVariableBase = mSystemMemoryEnd + 1 - ALIGN_VALUE (PcdGet32 (PcdPeiGlobalVariableSize), 0x8);\r
  } else {\r
    GlobalVariableBase = mGlobalVariableBase;\r
  }\r
\r
  if (VariableSize == 4) {\r
    WriteUnaligned32 ((UINT32*)(GlobalVariableBase + VariableOffset), *(UINT32*)Variable);\r
  } else if (VariableSize == 8) {\r
    WriteUnaligned64 ((UINT64*)(GlobalVariableBase + VariableOffset), *(UINT64*)Variable);\r
  } else {\r
    CopyMem ((VOID*)(GlobalVariableBase + VariableOffset), Variable, VariableSize);\r
  }\r
}\r
\r
VOID*\r
ArmPlatformGetGlobalVariableAddress (\r
  IN  UINTN     VariableOffset\r
  )\r
{\r
  UINTN  GlobalVariableBase;\r
\r
  // Ensure the Global Variable Size have been initialized\r
  ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));\r
\r
  if (IS_XIP()) {\r
    // In Case of XIP, we expect the Primary Stack at the top of the System Memory\r
    // The size must be 64bit aligned to allow 64bit variable to be aligned\r
    GlobalVariableBase = mSystemMemoryEnd + 1 - ALIGN_VALUE (PcdGet32 (PcdPeiGlobalVariableSize), 0x8);\r
  } else {\r
    GlobalVariableBase = mGlobalVariableBase;\r
  }\r
\r
  return (VOID*)(GlobalVariableBase + VariableOffset);\r
}\r