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

ArmPlatformPkg/PrePeiCore/PrePeiCore.h

@@ -15,7 +15,11 @@
 #ifndef __PREPEICORE_H_
 #define __PREPEICORE_H_
 
+#include <Library/ArmLib.h>
+#include <Library/ArmPlatformLib.h>
+#include <Library/BaseMemoryLib.h>
 #include <Library/DebugLib.h>
+#include <Library/IoLib.h>
 #include <Library/PcdLib.h>
 
 #include <PiPei.h>
@@ -31,6 +35,11 @@ SecTemporaryRamSupport (
   IN UINTN                    CopySize
   );
 
+EFI_STATUS
+PrePeiCoreGetGlobalVariableMemory (
+  OUT EFI_PHYSICAL_ADDRESS    *GlobalVariableBase
+  );
+
 VOID
 SecSwitchStack (
   INTN    StackDelta