diff -r a179b74831c9 -r c1f20ce4abcf kernel/eka/memmodel/epoc/mmubase/mmubase.cpp
--- a/kernel/eka/memmodel/epoc/mmubase/mmubase.cpp	Thu Aug 19 11:14:22 2010 +0300
+++ b/kernel/eka/memmodel/epoc/mmubase/mmubase.cpp	Tue Aug 31 16:34:26 2010 +0300
@@ -651,6 +651,17 @@
 	}
 
 
+TInt MmuBase::FreeRamZone(TUint aZoneId, TPhysAddr& aZoneBase, TUint& aZoneBytes)
+	{
+	TUint zonePages;
+	TInt r = iRamPageAllocator->GetZoneAddress(aZoneId, aZoneBase, zonePages);
+	if (r != KErrNone)
+		return r;
+	aZoneBytes = zonePages << KPageShift;
+	return MmuBase::FreePhysicalRam(aZoneBase, aZoneBytes);
+	}
+
+
 TInt MmuBase::ClaimPhysicalRam(TPhysAddr aPhysAddr, TInt aSize)
 	{
 	__KTRACE_OPT(KMMU,Kern::Printf("Mmu::ClaimPhysicalRam(%08x,%x)",aPhysAddr,aSize));
@@ -2049,6 +2060,45 @@
 
 
 /**
+Free a RAM zone which was previously allocated by one of these methods:
+Epoc::AllocPhysicalRam(), Epoc::ZoneAllocPhysicalRam() or 
+TRamDefragRequest::ClaimRamZone().
+
+All of the pages in the RAM zone must be allocated and only via one of the methods 
+listed above, otherwise a system panic will occur.
+
+@param	aZoneId			The ID of the RAM zone to free.
+@return	KErrNone 		If the operation was successful.
+		KErrArgument 	If a RAM zone with ID aZoneId was not found.
+
+@pre Calling thread must be in a critical section.
+@pre Interrupts must be enabled.
+@pre Kernel must be unlocked.
+@pre No fast mutex can be held.
+@pre Call in a thread context.
+@pre Can be used in a device driver.
+*/
+EXPORT_C TInt Epoc::FreeRamZone(TUint aZoneId)
+	{
+	CHECK_PRECONDITIONS(MASK_THREAD_CRITICAL,"Epoc::FreeRamZone");
+	MmuBase& m = *MmuBase::TheMmu;
+	MmuBase::Wait();
+	TPhysAddr zoneBase;
+	TUint zoneBytes;
+	TInt r = m.FreeRamZone(aZoneId, zoneBase, zoneBytes);
+#ifdef BTRACE_KERNEL_MEMORY
+	if (r == KErrNone)
+		{
+		BTrace8(BTrace::EKernelMemory, BTrace::EKernelMemoryDrvPhysFree, zoneBytes, zoneBase);
+		Epoc::DriverAllocdPhysRam -= zoneBytes;
+		}
+#endif
+	MmuBase::Signal();
+	return r;
+	}
+
+
+/**
 Translate a virtual address to the corresponding physical address.
 
 @param	aLinAddr	The virtual address to be translated.