linux/arch/x86/include/asm/i8253.h

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#ifndef _ASM_X86_I8253_H
#define _ASM_X86_I8253_H
/* i8253A PIT registers */
#define PIT_MODE 0x43
#define PIT_CH0 0x40
#define PIT_CH2 0x42
extern raw_spinlock_t i8253_lock;
extern struct clock_event_device *global_clock_event;
extern void setup_pit_timer(void);
#define inb_pit inb_p
#define outb_pit outb_p
#endif /* _ASM_X86_I8253_H */