1#ifndef _ASM_X86_I8253_H 2#define _ASM_X86_I8253_H 3 4/* i8253A PIT registers */ 5#define PIT_MODE 0x43 6#define PIT_CH0 0x40 7#define PIT_CH2 0x42 8 9extern raw_spinlock_t i8253_lock; 10 11extern struct clock_event_device *global_clock_event; 12 13extern void setup_pit_timer(void); 14 15#define inb_pit inb_p 16#define outb_pit outb_p 17 18#endif /* _ASM_X86_I8253_H */ 19