diff --git a/arch/powerpc/include/asm/mp.h b/arch/powerpc/include/asm/mp.h
index 3ffa30b..fe490ba 100644
--- a/arch/powerpc/include/asm/mp.h
+++ b/arch/powerpc/include/asm/mp.h
@@ -28,4 +28,10 @@
 u32 determine_mp_bootpg(void);
 int is_core_disabled(int nr);
 
+#ifdef CONFIG_E6500
+#define thread_to_core(x) (x >> 1)
+#else
+#define thread_to_core(x) (x)
+#endif
+
 #endif