📄 timer.h
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#ifndef _TIMER_H
#define _TIMER_H
#define HZ 20L
extern volatile unsigned char jiffies;
extern struct time_val xtime;
#define time_after(a,b) ((char)(b) - (char)(a) < 0)
#define time_before(a,b) time_after(b,a)
#define time_after_eq(a,b) ((char)(a) - (char)(b) >= 0)
#define time_before_eq(a,b) time_after_eq(b,a)
struct time_val {
unsigned char min;
unsigned char sec;
unsigned char msec10;
};
#endif
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