include/asm-i386/timer.h

   1 #ifndef _ASMi386_TIMER_H
   2 #define _ASMi386_TIMER_H
   3
   4 /**
   5  * struct timer_ops - used to define a timer source
   6  *
   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
  10  *        on failure.
  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
  15  *                   timer.
  16  * @delay: delays this many clock cycles.
  17  */
  18 struct timer_opts{
  19         char* name;
  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);
  25 };
  26
  27 #define TICK_SIZE (tick_nsec / 1000)
  28
  29 extern struct timer_opts* select_timer(void);
  30 extern void clock_fallback(void);
  31 void setup_pit_timer(void);
  32
  33 /* Modifiers for buggy PIT handling */
  34
  35 extern int pit_latch_buggy;
  36
  37 extern struct timer_opts *cur_timer;
  38 extern int timer_ack;
  39
  40 /* list of externed timers */
  41 extern struct timer_opts timer_none;
  42 extern struct timer_opts timer_pit;
  43 extern struct timer_opts timer_tsc;
  44 #ifdef CONFIG_X86_CYCLONE_TIMER
  45 extern struct timer_opts timer_cyclone;
  46 #endif
  47
  48 extern unsigned long calibrate_tsc(void);
  49 extern void init_cpu_khz(void);
  50 #ifdef CONFIG_HPET_TIMER
  51 extern struct timer_opts timer_hpet;
  52 extern unsigned long calibrate_tsc_hpet(unsigned long *tsc_hpet_quotient_ptr);
  53 #endif
  54
  55 #ifdef CONFIG_X86_PM_TIMER
  56 extern struct timer_opts timer_pmtmr;
  57 #endif
  58 #endif