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         unsigned long (*read_timer)(void);
  26 };
  27
  28 struct init_timer_opts {
  29         int (*init)(char *override);
  30         struct timer_opts *opts;
  31 };
  32
  33 #define TICK_SIZE (tick_nsec / 1000)
  34
  35 extern struct timer_opts* __init select_timer(void);
  36 extern void clock_fallback(void);
  37 void setup_pit_timer(void);
  38
  39 /* Modifiers for buggy PIT handling */
  40
  41 extern int pit_latch_buggy;
  42
  43 extern struct timer_opts *cur_timer;
  44 extern int timer_ack;
  45
  46 /* list of externed timers */
  47 extern struct timer_opts timer_none;
  48 extern struct timer_opts timer_pit;
  49 extern struct init_timer_opts timer_pit_init;
  50 extern struct init_timer_opts timer_tsc_init;
  51 #ifdef CONFIG_X86_CYCLONE_TIMER
  52 extern struct init_timer_opts timer_cyclone_init;
  53 #endif
  54
  55 extern unsigned long calibrate_tsc(void);
  56 extern unsigned long read_timer_tsc(void);
  57 extern void init_cpu_khz(void);
  58 extern int recalibrate_cpu_khz(void);
  59 #ifdef CONFIG_HPET_TIMER
  60 extern struct init_timer_opts timer_hpet_init;
  61 extern unsigned long calibrate_tsc_hpet(unsigned long *tsc_hpet_quotient_ptr);
  62 #endif
  63
  64 #ifdef CONFIG_X86_PM_TIMER
  65 extern struct init_timer_opts timer_pmtmr_init;
  66 #endif
  67 #endif