1 #ifndef _ASMi386_TIMER_H
2 #define _ASMi386_TIMER_H
5 * struct timer_ops - used to define a timer source
7 * @name: name of the timer.
8 * @init: Probes and initializes the timer. Takes clock= override
9 * string as an argument. Returns 0 on success, anything else
11 * @mark_offset: called by the timer interrupt.
12 * @get_offset: called by gettimeofday(). Returns the number of microseconds
13 * since the last timer interupt.
14 * @monotonic_clock: returns the number of nanoseconds since the init of the
16 * @delay: delays this many clock cycles.
20 int (*init)(char *override);
21 void (*mark_offset)(void);
22 unsigned long (*get_offset)(void);
23 unsigned long long (*monotonic_clock)(void);
24 void (*delay)(unsigned long);
27 #define TICK_SIZE (tick_nsec / 1000)
29 extern struct timer_opts* select_timer(void);
30 extern void clock_fallback(void);
32 /* Modifiers for buggy PIT handling */
34 extern int pit_latch_buggy;
36 extern struct timer_opts *cur_timer;
39 /* list of externed timers */
40 extern struct timer_opts timer_none;
41 extern struct timer_opts timer_pit;
42 extern struct timer_opts timer_tsc;
43 #ifdef CONFIG_X86_CYCLONE_TIMER
44 extern struct timer_opts timer_cyclone;
47 extern unsigned long calibrate_tsc(void);
48 extern void init_cpu_khz(void);
49 #ifdef CONFIG_HPET_TIMER
50 extern struct timer_opts timer_hpet;
51 extern unsigned long calibrate_tsc_hpet(unsigned long *tsc_hpet_quotient_ptr);
54 #ifdef CONFIG_X86_PM_TIMER
55 extern struct timer_opts timer_pmtmr;