service utility can par cpu option in system.conf

- does not have any effect, solely for debugging SMP

- backward compatible with older RS instance

include/minix/config.h

@@ -85,6 +85,10 @@
 /* default scheduling quanta */
 #define USER_QUANTUM 200
 
+/* defualt user process cpu */
+#define USER_DEFAULT_CPU	-1 /* use the default cpu or do not change the
+				      current one */
+
 /*===========================================================================*
  *	There are no user-settable parameters after this line		     *
  *===========================================================================*/

include/minix/priv.h

@@ -89,4 +89,7 @@
 #define DSRV_QT   USER_QUANTUM                     /* dynamic system services */
 #define USR_QT    USER_QUANTUM                     /* user processes */
 
+/* default CPU */
+#define DSRV_CPU USER_DEFAULT_CPU
+
 #endif /* _MINIX_PRIV_H */

include/minix/rs.h

@@ -71,6 +71,14 @@ struct rs_start
 	bitchunk_t rss_vm[VM_CALL_MASK_SIZE];
 	int rss_nr_control;
 	struct rss_label rss_control[RS_NR_CONTROL];
+
+	/*
+	 * SMP specific data
+	 *
+	 * must be at the end of the structure for binary compatibility with
+	 * non-smp sysytems
+	 */
+	int rss_cpu;
 };
 
 /* ACL information for access to PCI devices */