include/asm-i386/timer.h

   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  */
  19 struct 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
  27 struct init_timer_opts {
  28         int (*init)(char *override);
  29         struct timer_opts *opts;
  30 };
  31
  32 #define TICK_SIZE (tick_nsec / 1000)
  33
  34 extern struct timer_opts* __init select_timer(void);
  35 extern void clock_fallback(void);
  36 void setup_pit_timer(void);
  37
  38 /* Modifiers for buggy PIT handling */
  39
  40 extern int pit_latch_buggy;
  41
  42 extern struct timer_opts *cur_timer;
  43 extern int timer_ack;
  44
  45 /* list of externed timers */
  46 extern struct timer_opts timer_none;
  47 extern struct timer_opts timer_pit;
  48 extern struct init_timer_opts timer_pit_init;
  49 extern struct init_timer_opts timer_tsc_init;
  50 #ifdef CONFIG_X86_CYCLONE_TIMER
  51 extern struct init_timer_opts timer_cyclone_init;
  52 #endif
  53
  54 extern unsigned long calibrate_tsc(void);
  55 extern void init_cpu_khz(void);
  56 #ifdef CONFIG_HPET_TIMER
  57 extern struct init_timer_opts timer_hpet_init;
  58 extern unsigned long calibrate_tsc_hpet(unsigned long *tsc_hpet_quotient_ptr);
  59 #endif
  60
  61 #ifdef CONFIG_X86_PM_TIMER
  62 extern struct init_timer_opts timer_pmtmr_init;
  63 #endif
  64 #endif