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#include <linux/pm.h>
5
6/**
7 * struct timer_ops - used to define a timer source
8 *
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
12 * on failure.
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
17 * timer.
18 * @delay: delays this many clock cycles.
19 */
20struct timer_opts {
21 char* name;
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);
28 int (*resume)(void);
29};
30
31struct init_timer_opts {
32 int (*init)(char *override);
33 struct timer_opts *opts;
34};
35
36#define TICK_SIZE (tick_nsec / 1000)
37
38extern struct timer_opts* __init select_timer(void);
39extern void clock_fallback(void);
40void setup_pit_timer(void);
41
42/* Modifiers for buggy PIT handling */
43
44extern int pit_latch_buggy;
45
46extern struct timer_opts *cur_timer;
47extern int timer_ack;
48
49/* list of externed timers */
50extern struct timer_opts timer_none;
51extern struct timer_opts timer_pit;
52extern struct init_timer_opts timer_pit_init;
53extern struct init_timer_opts timer_tsc_init;
54#ifdef CONFIG_X86_CYCLONE_TIMER
55extern struct init_timer_opts timer_cyclone_init;
56#endif
57
58extern unsigned long calibrate_tsc(void);
59extern unsigned long read_timer_tsc(void);
60extern void init_cpu_khz(void);
61extern int recalibrate_cpu_khz(void);
62#ifdef CONFIG_HPET_TIMER
63extern struct init_timer_opts timer_hpet_init;
64extern unsigned long calibrate_tsc_hpet(unsigned long *tsc_hpet_quotient_ptr);
65#endif
66
67#ifdef CONFIG_X86_PM_TIMER
68extern struct init_timer_opts timer_pmtmr_init;
69#endif
70#endif