Create X64 mode page tables in memory even when PEI is already X64

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6550 6f19259b-4bc3-4df7-8a09-765794883524

MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c

@@ -13,6 +13,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 **/
 
 #include "DxeIpl.h"
+#include "X64/VirtualMemory.h"
 
 
 
@@ -36,6 +37,7 @@ HandOffToDxeCore (
   VOID                *BaseOfStack;
   VOID                *TopOfStack;
   EFI_STATUS          Status;
+  UINTN               PageTables;
 
   //
   // Allocate 128KB for the Stack
@@ -50,12 +52,19 @@ HandOffToDxeCore (
   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
 
+  //
+  // Create page table and save PageMapLevel4 to CR3
+  //
+  PageTables = CreateIdentityMappingPageTables ();
+
   //
   // End of PEI phase singal
   //
   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
   ASSERT_EFI_ERROR (Status);
 
+  AsmWriteCr3 (PageTables);
+
   //
   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
   //