Index: kernel/arch/sparc64/Makefile.inc
===================================================================
--- kernel/arch/sparc64/Makefile.inc	(revision 6ab8697dc506650b8712d1dc5e817cc473bf170a)
+++ kernel/arch/sparc64/Makefile.inc	(revision 68834d85136ffcc33645830b2453ac1352a8802a)
@@ -52,4 +52,10 @@
 endif
 
+ifeq ($(PROCESSOR),sun4v)
+	DEFS += -DSUN4V
+#MH
+	DEFS += -DUS
+endif
+
 ARCH_SOURCES = \
 	arch/$(KARCH)/src/cpu/cpu.c \