LXR linux/arch/x86/include/asm/timer.h

   1#ifndef _ASM_X86_TIMER_H
   2#define _ASM_X86_TIMER_H
   3#include <linux/pm.h>
   4#include <linux/percpu.h>
   5#include <linux/interrupt.h>
   6#include <linux/math64.h>
   7
   8#define TICK_SIZE (tick_nsec / 1000)
   9
  10unsigned long long native_sched_clock(void);
  11extern int recalibrate_cpu_khz(void);
  12
  13extern int no_timer_check;
  14
  15/*
  16 * We use the full linear equation: f(x) = a + b*x, in order to allow
  17 * a continuous function in the face of dynamic freq changes.
  18 *
  19 * Continuity means that when our frequency changes our slope (b); we want to
  20 * ensure that: f(t) == f'(t), which gives: a + b*t == a' + b'*t.
  21 *
  22 * Without an offset (a) the above would not be possible.
  23 *
  24 * See the comment near cycles_2_ns() for details on how we compute (b).
  25 */
  26struct cyc2ns_data {
  27        u32 cyc2ns_mul;
  28        u32 cyc2ns_shift;
  29        u64 cyc2ns_offset;
  30        u32 __count;
  31        /* u32 hole */
  32}; /* 24 bytes -- do not grow */
  33
  34extern struct cyc2ns_data *cyc2ns_read_begin(void);
  35extern void cyc2ns_read_end(struct cyc2ns_data *);
  36
  37#endif /* _ASM_X86_TIMER_H */
  38