Linux kernel mirror (for testing)
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linux
1#ifndef _ASMi386_TIMER_H
2#define _ASMi386_TIMER_H
3#include <linux/init.h>
4
5/**
6 * struct timer_ops - used to define a timer source
7 *
8 * @name: name of the timer.
9 * @init: Probes and initializes the timer. Takes clock= override
10 * string as an argument. Returns 0 on success, anything else
11 * on failure.
12 * @mark_offset: called by the timer interrupt.
13 * @get_offset: called by gettimeofday(). Returns the number of microseconds
14 * since the last timer interupt.
15 * @monotonic_clock: returns the number of nanoseconds since the init of the
16 * timer.
17 * @delay: delays this many clock cycles.
18 */
19struct timer_opts {
20 char* name;
21 void (*mark_offset)(void);
22 unsigned long (*get_offset)(void);
23 unsigned long long (*monotonic_clock)(void);
24 void (*delay)(unsigned long);
25};
26
27struct init_timer_opts {
28 int (*init)(char *override);
29 struct timer_opts *opts;
30};
31
32#define TICK_SIZE (tick_nsec / 1000)
33
34extern struct timer_opts* __init select_timer(void);
35extern void clock_fallback(void);
36void setup_pit_timer(void);
37
38/* Modifiers for buggy PIT handling */
39
40extern int pit_latch_buggy;
41
42extern struct timer_opts *cur_timer;
43extern int timer_ack;
44
45/* list of externed timers */
46extern struct timer_opts timer_none;
47extern struct timer_opts timer_pit;
48extern struct init_timer_opts timer_pit_init;
49extern struct init_timer_opts timer_tsc_init;
50#ifdef CONFIG_X86_CYCLONE_TIMER
51extern struct init_timer_opts timer_cyclone_init;
52#endif
53
54extern unsigned long calibrate_tsc(void);
55extern void init_cpu_khz(void);
56extern int recalibrate_cpu_khz(void);
57#ifdef CONFIG_HPET_TIMER
58extern struct init_timer_opts timer_hpet_init;
59extern unsigned long calibrate_tsc_hpet(unsigned long *tsc_hpet_quotient_ptr);
60#endif
61
62#ifdef CONFIG_X86_PM_TIMER
63extern struct init_timer_opts timer_pmtmr_init;
64#endif
65#endif