+/**\r
+ Special handler for #DB exception, which will restore the page attributes\r
+ (not-present). It should work with #PF handler which will set pages to\r
+ 'present'.\r
+\r
+ @param ExceptionType Exception type.\r
+ @param SystemContext Pointer to EFI_SYSTEM_CONTEXT.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+DebugExceptionHandler (\r
+ IN EFI_EXCEPTION_TYPE ExceptionType,\r
+ IN EFI_SYSTEM_CONTEXT SystemContext\r
+ );\r
+\r
+/**\r
+ Special handler for #PF exception, which will set the pages which caused\r
+ #PF to be 'present'. The attribute of those pages should be restored in\r
+ the subsequent #DB handler.\r
+\r
+ @param ExceptionType Exception type.\r
+ @param SystemContext Pointer to EFI_SYSTEM_CONTEXT.\r
+\r
+**/\r
+VOID\r
+EFIAPI\r
+PageFaultExceptionHandler (\r
+ IN EFI_EXCEPTION_TYPE ExceptionType,\r
+ IN EFI_SYSTEM_CONTEXT SystemContext\r
+ );\r
+\r
+extern BOOLEAN mIsAllocatingPageTable;\r
+extern UINTN mNumberOfProcessors;\r
+\r