[mirror_ubuntu-bionic-kernel.git] / arch / x86 / include / asm / timer.h

#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 int 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;
	u32 __count;
	/* u32 hole */
}; /* 24 bytes -- do not grow */

extern struct cyc2ns_data *cyc2ns_read_begin(void);
extern void cyc2ns_read_end(struct cyc2ns_data *);

#endif /* _ASM_X86_TIMER_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_TIMER_H
1965aae3 PA	2	#define _ASM_X86_TIMER_H
c3c433e4	3	#include <linux/pm.h>
53d517cd	4	#include <linux/percpu.h>
8e6dafd6	5	#include <linux/interrupt.h>
5dd12c21	6	#include <linux/math64.h>
1da177e4	7
1da177e4	8	#define TICK_SIZE (tick_nsec / 1000)
6cb9a835	9
6cb9a835	10	unsigned long long native_sched_clock(void);
64fcbac1	11	extern int recalibrate_cpu_khz(void);
6cb9a835	12
cc038491	13	extern int no_timer_check;
1da177e4	14
698eff63 PZ	15	extern bool using_native_sched_clock(void);
698eff63 PZ	16
20d1c86a PZ	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 + bt == 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	*/
	28	struct cyc2ns_data {
	29	u32 cyc2ns_mul;
	30	u32 cyc2ns_shift;
	31	u64 cyc2ns_offset;
	32	u32 __count;
	33	/* u32 hole */
	34	}; /* 24 bytes -- do not grow */
	35
	36	extern struct cyc2ns_data *cyc2ns_read_begin(void);
	37	extern void cyc2ns_read_end(struct cyc2ns_data *);
688340ea	38
1965aae3	39	#endif /* _ASM_X86_TIMER_H */