diff -r 2d65c2f76d7b -r 947f0dc9f7a8 kernel/eka/include/nkern/nkern.h
--- a/kernel/eka/include/nkern/nkern.h	Tue Feb 02 01:24:03 2010 +0200
+++ b/kernel/eka/include/nkern/nkern.h	Fri Apr 16 16:24:37 2010 +0300
@@ -36,7 +36,7 @@
 /** @internalComponent */
 IMPORT_C void NKFault(const char* file, TInt line);
 /** @internalComponent */
-void NKIdle(TInt aStage);
+void NKIdle(TUint32 aStage);
 }
 
 /**
@@ -715,13 +715,14 @@
 	Pointer to a function which is called whenever a CPU goes idle
 
 	@param	aPtr	The iPtr stored in the SCpuIdleHandler structure
-	@param	aStage	If positive, the number of processors still active
-					If zero, indicates all processors are now idle
-					-1 indicates that postamble processing is required after waking up
+	@param	aStage	Bits 0-7 give a bitmask of CPUs now active, i.e. 0 means all processors now idle
+					Bit 31 set indicates that the current core can now be powered down
+					Bit 30 set indicates that other cores still remain to be retired
+					Bit 29 set indicates that postamble processing is required after waking up
 
 	@internalComponent
 */
-typedef void (*TCpuIdleHandlerFn)(TAny* aPtr, TInt aStage);
+typedef void (*TCpuIdleHandlerFn)(TAny* aPtr, TUint32 aStage);
 
 /** Idle handler structure
 
@@ -729,6 +730,17 @@
 */
 struct SCpuIdleHandler
 	{
+	/**
+	Defined flag bits in aStage parameter
+	*/
+	enum
+		{
+		EActiveCpuMask=0xFFu,
+		EPostamble=1u<<29,		// postamble needed
+		EMore=1u<<30,			// more cores still to be retired
+		ERetire=1u<<31,			// this core can now be retired
+		};
+
 	TCpuIdleHandlerFn	iHandler;
 	TAny*				iPtr;
 	volatile TBool		iPostambleRequired;
@@ -814,6 +826,7 @@
 	IMPORT_C static void ThreadRelease(NThread* aThread, TInt aReturnValue, NFastMutex* aMutex);
 	IMPORT_C static void ThreadSetPriority(NThread* aThread, TInt aPriority);
 	IMPORT_C static void ThreadSetPriority(NThread* aThread, TInt aPriority, NFastMutex* aMutex);
+	static void ThreadSetNominalPriority(NThread* aThread, TInt aPriority);
 	IMPORT_C static void ThreadRequestSignal(NThread* aThread);
 	IMPORT_C static void ThreadRequestSignal(NThread* aThread, NFastMutex* aMutex);
 	IMPORT_C static void ThreadRequestSignal(NThread* aThread, TInt aCount);