1 #ifndef _ASMi386_TIMER_H
2 #define _ASMi386_TIMER_H
3 #include <linux/init.h>
7 * struct timer_ops - used to define a timer source
9 * @name: name of the timer.
10 * @init: Probes and initializes the timer. Takes clock= override
11 * string as an argument. Returns 0 on success, anything else
13 * @mark_offset: called by the timer interrupt.
14 * @get_offset: called by gettimeofday(). Returns the number of microseconds
15 * since the last timer interupt.
16 * @monotonic_clock: returns the number of nanoseconds since the init of the
18 * @delay: delays this many clock cycles.
22 void (*mark_offset)(void);
23 unsigned long (*get_offset)(void);
24 unsigned long long (*monotonic_clock)(void);
25 void (*delay)(unsigned long);
26 unsigned long (*read_timer)(void);
27 int (*suspend)(pm_message_t state);
31 struct init_timer_opts {
32 int (*init)(char *override);
33 struct timer_opts *opts;
36 #define TICK_SIZE (tick_nsec / 1000)
38 extern struct timer_opts* __init select_timer(void);
39 extern void clock_fallback(void);
40 void setup_pit_timer(void);
42 /* Modifiers for buggy PIT handling */
44 extern int pit_latch_buggy;
46 extern struct timer_opts *cur_timer;
49 /* list of externed timers */
50 extern struct timer_opts timer_none;
51 extern struct timer_opts timer_pit;
52 extern struct init_timer_opts timer_pit_init;
53 extern struct init_timer_opts timer_tsc_init;
54 #ifdef CONFIG_X86_CYCLONE_TIMER
55 extern struct init_timer_opts timer_cyclone_init;
58 extern unsigned long calibrate_tsc(void);
59 extern unsigned long read_timer_tsc(void);
60 extern void init_cpu_khz(void);
61 extern int recalibrate_cpu_khz(void);
62 #ifdef CONFIG_HPET_TIMER
63 extern struct init_timer_opts timer_hpet_init;
64 extern unsigned long calibrate_tsc_hpet(unsigned long *tsc_hpet_quotient_ptr);
67 #ifdef CONFIG_X86_PM_TIMER
68 extern struct init_timer_opts timer_pmtmr_init;