extern void set_handler (unsigned long offset, void *addr, unsigned long len);
extern void set_uncached_handler (unsigned long offset, void *addr, unsigned long len);
-extern void *set_vi_handler (int n, void *addr);
+
+typedef void (*vi_handler_t)(void);
+extern void *set_vi_handler (int n, vi_handler_t addr);
+
extern void *set_except_vector(int n, void *addr);
extern unsigned long ebase;
extern void per_cpu_trap_init(void);