diff --git a/entry/boot.c b/entry/boot.c
index f5013fe..61a7de9 100644
--- a/entry/boot.c
+++ b/entry/boot.c
@@ -10,7 +10,7 @@ void __eabi(void)
 
 void main(void)
 {
-	if (ofw_test("open"))
+	if (test("open"))
 	{
 		asm("mr 27, 28");
 		asm("b $");
diff --git a/entry/ofw/common.c b/entry/ofw/common.c
index 906b99b..55a48d6 100644
--- a/entry/ofw/common.c
+++ b/entry/ofw/common.c
@@ -2,7 +2,7 @@
 
 extern void (*ofw)();
 
-int32_t ofw_test(char* name)
+int32_t test(char* name)
 {
         struct 
         {
diff --git a/entry/ofw/control.c b/entry/ofw/control.c
new file mode 100644
index 0000000..6342f36
--- /dev/null
+++ b/entry/ofw/control.c
@@ -0,0 +1,73 @@
+#include <ofw.h>
+
+extern void (*ofw)();
+
+void boot(char* bootspec)
+{
+        struct
+        {
+                char* service;
+                int32_t n_args;
+                int32_t n_rets;
+                char* arg;
+        } ofw_arg;
+
+	SERVICE("boot", 5, 1, 0);
+	
+        ofw_arg.arg = bootspec;
+
+        ofw(&ofw_arg);
+}
+
+void enter(void)
+{
+	struct
+	{
+		char* service;
+		int32_t n_args;
+		int32_t n_rets;
+	} ofw_arg;
+
+	SERVICE("enter", 6, 0, 0);
+
+	ofw(&ofw_arg);
+}
+
+void ofw_exit(void)
+{       
+        struct
+        {       
+                char* service;
+                int32_t n_args;
+                int32_t n_rets;
+        } ofw_arg;
+        
+        SERVICE("exit", 5, 0, 0);
+        
+        ofw(&ofw_arg);
+}
+
+void chain(void* virt, int32_t size, void* entry, void* args, int32_t len)
+{
+	struct
+	{
+		char* service;
+		int32_t n_args;
+		int32_t n_rets;
+		void* arg1;
+		int32_t arg2;
+		void* arg3;
+		void* arg4;
+		int32_t arg5;
+	} ofw_arg;
+	
+	SERVICE("chain", 6, 5, 0);
+
+	ofw_arg.arg1 = virt;
+	ofw_arg.arg2 = size;
+	ofw_arg.arg3 = entry;
+	ofw_arg.arg4 = args;
+	ofw_arg.arg5 = len;
+
+	ofw(&ofw_arg);
+}