blob: 7365dd4acffb654d4c2ab3f15a9f85ee3f0c35f0 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_X86_TIMER_H
#define _ASM_X86_TIMER_H
#include <linux/pm.h>
#include <linux/percpu.h>
#include <linux/interrupt.h>
#include <linux/math64.h>
#define TICK_SIZE (tick_nsec / 1000)
unsigned long long native_sched_clock(void);
extern void recalibrate_cpu_khz(void);
extern int no_timer_check;
extern bool using_native_sched_clock(void);
* We use the full linear equation: f(x) = a + b*x, in order to allow
* a continuous function in the face of dynamic freq changes.
* Continuity means that when our frequency changes our slope (b); we want to
* ensure that: f(t) == f'(t), which gives: a + b*t == a' + b'*t.
* Without an offset (a) the above would not be possible.
* See the comment near cycles_2_ns() for details on how we compute (b).
struct cyc2ns_data {
u32 cyc2ns_mul;
u32 cyc2ns_shift;
u64 cyc2ns_offset;
}; /* 16 bytes */
extern void cyc2ns_read_begin(struct cyc2ns_data *);
extern void cyc2ns_read_end(void);
#endif /* _ASM_X86_TIMER_H */