ArmPlatformPkg: Introduce ArmPlatformGlobalVariableLib

This library hides where the 'XIP' Global Variable are located in the memory.
It is expected the Sec/PrePi modules define the Global Variable area through
the GlobalVariable HOB.

The ArmPlatformGlobalVariableLib library allows access to global variables by
their offsets in this region.




git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12420 6f19259b-4bc3-4df7-8a09-765794883524

2 files changed, 111 insertions, 0 deletions

diff --git a/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/Dxe/DxeArmPlatformGlobalVariableLib.c b/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/Dxe/DxeArmPlatformGlobalVariableLib.c
new file mode 100644
index 0000000000..aebc912935
--- /dev/null
+++ b/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/Dxe/DxeArmPlatformGlobalVariableLib.c
@@ -0,0 +1,69 @@
+/** @file
+*
+*  Copyright (c) 2011, ARM Limited. All rights reserved.
+*
+*  This program and the accompanying materials
+*  are licensed and made available under the terms and conditions of the BSD License
+*  which accompanies this distribution.  The full text of the license may be found at
+*  http://opensource.org/licenses/bsd-license.php
+*
+*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+*
+**/
+
+#include <PiDxe.h>
+#include <Library/ArmPlatformGlobalVariableLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/HobLib.h>
+#include <Library/PcdLib.h>
+
+#include <Guid/ArmGlobalVariableHob.h>
+
+UINTN  mGlobalVariableBase = 0;
+
+RETURN_STATUS
+EFIAPI
+ArmPlatformGlobalVariableConstructor (
+  VOID
+  )
+{
+  ARM_HOB_GLOBAL_VARIABLE  *Hob;
+
+  Hob = GetFirstGuidHob (&gArmGlobalVariableGuid);
+  ASSERT (Hob != NULL);
+
+  mGlobalVariableBase = Hob->GlobalVariableBase;
+
+  return EFI_SUCCESS;
+}
+
+VOID
+ArmPlatformGetGlobalVariable (
+  IN  UINTN     VariableOffset,
+  IN  UINTN     VariableSize,
+  OUT VOID*     Variable
+  )
+{
+  if (mGlobalVariableBase == 0) {
+    ArmPlatformGlobalVariableConstructor ();
+  }
+
+  CopyMem (Variable, (VOID*)(mGlobalVariableBase + VariableOffset), VariableSize);
+}
+
+VOID
+ArmPlatformSetGlobalVariable (
+  IN  UINTN     VariableOffset,
+  IN  UINTN     VariableSize,
+  OUT VOID*     Variable
+  )
+{
+  if (mGlobalVariableBase == 0) {
+    ArmPlatformGlobalVariableConstructor ();
+  }
+
+  CopyMem ((VOID*)(mGlobalVariableBase + VariableOffset), Variable, VariableSize);
+}
+
diff --git a/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/Dxe/DxeArmPlatformGlobalVariableLib.inf b/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/Dxe/DxeArmPlatformGlobalVariableLib.inf
new file mode 100644
index 0000000000..a1e9dcf80a
--- /dev/null
+++ b/ArmPlatformPkg/Library/ArmPlatformGlobalVariableLib/Dxe/DxeArmPlatformGlobalVariableLib.inf
@@ -0,0 +1,42 @@
+#/** @file
+# Timer library implementation
+#  
+#  
+#  Copyright (c) 2011, ARM Ltd. All rights reserved.<BR>
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD License
+#  which accompanies this distribution.  The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#  
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#  
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x00010005
+  BASE_NAME                      = DxeArmPlatformGlobalVariableLib
+  FILE_GUID                      = 53fa3cc3-23b7-4ec2-9bfa-30257d7e1135 
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = ArmPlatformGlobalVariableLib
+  
+  CONSTRUCTOR                    = ArmPlatformGlobalVariableConstructor
+
+[Sources.common]
+  DxeArmPlatformGlobalVariableLib.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+  ArmPlatformPkg/ArmPlatformPkg.dec
+
+[LibraryClasses]
+  BaseLib
+  HobLib
+
+[Guids]
+  gArmGlobalVariableGuid
+
+[FixedPcd]
+  gArmPlatformTokenSpaceGuid.PcdPeiGlobalVariableSize
+