1. update the definitions in debug agent library, rename DEBUG_AGENT_INIT_DXE to DEBUG_AGENT_INIT_DXE_CORE and add DEBUG_AGENT_INIT_S3.

2. disable debug timer interrupt in ExitBootServices().

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10239 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c

@@ -244,7 +244,7 @@ DxeMain (
   //
   // Initialize Debug Agent to support source level debug in DXE phase
   //
-  InitializeDebugAgent (DEBUG_AGENT_INIT_DXE, HobStart);
+  InitializeDebugAgent (DEBUG_AGENT_INIT_DXE_CORE, HobStart);
 
   //
   // Initialize Memory Services
@@ -685,6 +685,11 @@ CoreExitBootServices (
   //
   CoreNotifySignalList (&gEfiEventExitBootServicesGuid);
 
+  //
+  // Disable interrupt of Debug timer.
+  //
+  SaveAndSetDebugTimerInterrupt (FALSE);
+
   //
   // Disable CPU Interrupts
   //