Index: generic/include/proc/thread.h
===================================================================
--- generic/include/proc/thread.h	(revision 9f525639659c979c952ae9372c881791de6d13aa)
+++ generic/include/proc/thread.h	(revision 1b109cb54251e71a61747f3f1cdfbf22e71ef8d6)
@@ -41,4 +41,5 @@
 #include <adt/list.h>
 #include <mm/slab.h>
+#include <proc/uarg.h>
 
 #define THREAD_STACK_SIZE	STACK_SIZE
@@ -118,10 +119,4 @@
 };
 
-/** Structure passed to uinit kernel thread as argument. */
-typedef struct uspace_arg {
-	__address uspace_entry;
-	__address uspace_stack;
-} uspace_arg_t;
-
 /** Thread list lock.
  *
@@ -150,6 +145,6 @@
 
 /** Thread syscall prototypes. */
-__native sys_thread_create(__address function, void *arg, void *stack, char *name);
-__native sys_thread_exit(int status);
+__native sys_thread_create(uspace_arg_t *uspace_uarg, char *uspace_name);
+__native sys_thread_exit(int uspace_status);
 
 #endif
Index: generic/include/proc/uarg.h
===================================================================
--- generic/include/proc/uarg.h	(revision 1b109cb54251e71a61747f3f1cdfbf22e71ef8d6)
+++ generic/include/proc/uarg.h	(revision 1b109cb54251e71a61747f3f1cdfbf22e71ef8d6)
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2006 Jakub Jermar
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __UARG_H__
+#define __UARG_H__
+
+/** Structure passed to uinit kernel thread as argument. */
+typedef struct uspace_arg {
+	void *uspace_entry;
+	void *uspace_stack;
+
+	void (* uspace_thread_function)();
+	void *uspace_thread_arg;
+	
+	struct uspace_arg *uspace_uarg;
+} uspace_arg_t;
+
+#endif