ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/Pei/PeiArmPlatformGlobalVariableLib.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 // Declared by ArmPlatformPkg/PrePi Module
  23 extern UINTN mGlobalVariableBase;
  24
  25 VOID
  26 ArmPlatformGetGlobalVariable (
  27   IN  UINTN     VariableOffset,
  28   IN  UINTN     VariableSize,
  29   OUT VOID*     Variable
  30   )
  31 {
  32   UINTN  GlobalVariableBase;
  33
  34   // Ensure the Global Variable Size have been initialized
  35   ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));
  36
  37   GlobalVariableBase = PcdGet64 (PcdCPUCoresStackBase) + PcdGet32 (PcdCPUCorePrimaryStackSize) - PcdGet32 (PcdPeiGlobalVariableSize);
  38
  39   if (VariableSize == 4) {
  40     *(UINT32*)Variable = ReadUnaligned32 ((CONST UINT32*)(GlobalVariableBase + VariableOffset));
  41   } else if (VariableSize == 8) {
  42     *(UINT64*)Variable = ReadUnaligned64 ((CONST UINT64*)(GlobalVariableBase + VariableOffset));
  43   } else {
  44     CopyMem (Variable, (VOID*)(GlobalVariableBase + VariableOffset), VariableSize);
  45   }
  46 }
  47
  48 VOID
  49 ArmPlatformSetGlobalVariable (
  50   IN  UINTN     VariableOffset,
  51   IN  UINTN     VariableSize,
  52   OUT VOID*     Variable
  53   )
  54 {
  55   UINTN  GlobalVariableBase;
  56
  57   // Ensure the Global Variable Size have been initialized
  58   ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));
  59
  60   GlobalVariableBase = PcdGet64 (PcdCPUCoresStackBase) + PcdGet32 (PcdCPUCorePrimaryStackSize) - PcdGet32 (PcdPeiGlobalVariableSize);
  61
  62   if (VariableSize == 4) {
  63     WriteUnaligned32 ((UINT32*)(GlobalVariableBase + VariableOffset), *(UINT32*)Variable);
  64   } else if (VariableSize == 8) {
  65     WriteUnaligned64 ((UINT64*)(GlobalVariableBase + VariableOffset), *(UINT64*)Variable);
  66   } else {
  67     CopyMem ((VOID*)(GlobalVariableBase + VariableOffset), Variable, VariableSize);
  68   }
  69 }
  70
  71 VOID*
  72 ArmPlatformGetGlobalVariableAddress (
  73   IN  UINTN     VariableOffset
  74   )
  75 {
  76   UINTN  GlobalVariableBase;
  77
  78   // Ensure the Global Variable Size have been initialized
  79   ASSERT (VariableOffset < PcdGet32 (PcdPeiGlobalVariableSize));
  80
  81   GlobalVariableBase = PcdGet64 (PcdCPUCoresStackBase) + PcdGet32 (PcdCPUCorePrimaryStackSize) - PcdGet32 (PcdPeiGlobalVariableSize);
  82
  83   return (VOID*)(GlobalVariableBase + VariableOffset);
  84 }