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
  15extern bool using_native_sched_clock(void);
  16
  17/*
  18 * We use the full linear equation: f(x) = a + b*x, in order to allow
  19 * a continuous function in the face of dynamic freq changes.
  20 *
  21 * Continuity means that when our frequency changes our slope (b); we want to
  22 * ensure that: f(t) == f'(t), which gives: a + b*t == a' + b'*t.
  23 *
  24 * Without an offset (a) the above would not be possible.
  25 *
  26 * See the comment near cycles_2_ns() for details on how we compute (b).
  27 */
  28struct cyc2ns_data {
  29        u32 cyc2ns_mul;
  30        u32 cyc2ns_shift;
  31        u64 cyc2ns_offset;
  32}; /* 16 bytes */
  33
  34extern void cyc2ns_read_begin(struct cyc2ns_data *);
  35extern void cyc2ns_read_end(void);
  36
  37#endif /* _ASM_X86_TIMER_H */
  38