Parameterize maximum allocation address in hardware pool and scan memory descriptors in reverse

xtoskrnl/includes/mm/hlpool.hh

@@ -25,6 +25,7 @@ namespace MM
         public:
             STATIC XTAPI XTSTATUS AllocateHardwareMemory(IN PFN_NUMBER PageCount,
                                                          IN BOOLEAN Aligned,
+                                                         IN ULONGLONG MaximumAddress,
                                                          OUT PPHYSICAL_ADDRESS Buffer);
             STATIC XTAPI XTSTATUS MapHardwareMemory(IN PHYSICAL_ADDRESS PhysicalAddress,
                                                     IN PFN_NUMBER PageCount,