1 #ifndef __ASM_I8253_H__ 2 #define __ASM_I8253_H__ 3 4 /* i8253A PIT registers */ 5 #define PIT_MODE 0x43 6 #define PIT_CH0 0x40 7 #define PIT_CH2 0x42 8 9 extern spinlock_t i8253_lock; 10 11 extern struct clock_event_device *global_clock_event; 12 13 extern void setup_pit_timer(void); 14 15 #endif /* __ASM_I8253_H__ */ 16