Implement basic kernel spinlock mechanism

xtoskrnl/includes/kei.h

@@ -13,6 +13,10 @@
 
 
 /* Kernel services routines forward references */
+XTFASTCALL
+VOID
+KeAcquireQueuedSpinLock(IN KSPIN_LOCK_QUEUE_LEVEL LockLevel);
+
 XTAPI
 VOID
 KeClearEvent(IN PKEVENT Event);
@@ -71,6 +75,10 @@ XTFASTCALL
 KRUNLEVEL
 KeRaiseRunLevel(IN KRUNLEVEL RunLevel);
 
+XTFASTCALL
+VOID
+KeReleaseQueuedSpinLock(IN KSPIN_LOCK_QUEUE_LEVEL LockLevel);
+
 XTAPI
 LONG
 KeSetEvent(IN PKEVENT Event,