Improve arch-specific separation in API code.
diff --git a/inc/cpu.h b/inc/cpu.h
index 2eae33b..43bd356 100644
--- a/inc/cpu.h
+++ b/inc/cpu.h
@@ -37,7 +37,10 @@
 	void *stack_bottom;
 };
 
+void cpu_module_init(void);
+
 void cpu_init(struct cpu *c);
+size_t cpu_index(struct cpu *c);
 void cpu_irq_enable(struct cpu *c);
 void cpu_irq_disable(struct cpu *c);
 bool cpu_on(struct cpu *c);