[deliverable/linux.git] / arch / x86 / include / asm / tsc.h

/*
 * x86 TSC related functions
 */
#ifndef _ASM_X86_TSC_H
#define _ASM_X86_TSC_H

#include <asm/processor.h>

#define NS_SCALE	10 /* 2^10, carefully chosen */
#define US_SCALE	32 /* 2^32, arbitralrily chosen */

/*
 * Standard way to access the cycle counter.
 */
typedef unsigned long long cycles_t;

extern unsigned int cpu_khz;
extern unsigned int tsc_khz;

extern void disable_TSC(void);

static inline cycles_t get_cycles(void)
{
#ifndef CONFIG_X86_TSC
	if (!cpu_has_tsc)
		return 0;
#endif

	return rdtsc();
}

extern struct system_counterval_t convert_art_to_tsc(cycle_t art);

extern void tsc_init(void);
extern void mark_tsc_unstable(char *reason);
extern int unsynchronized_tsc(void);
extern int check_tsc_unstable(void);
extern int check_tsc_disabled(void);
extern unsigned long native_calibrate_tsc(void);
extern unsigned long long native_sched_clock_from_tsc(u64 tsc);

extern int tsc_clocksource_reliable;

/*
 * Boot-time check whether the TSCs are synchronized across
 * all CPUs/cores:
 */
extern void check_tsc_sync_source(int cpu);
extern void check_tsc_sync_target(void);

extern int notsc_setup(char *);
extern void tsc_save_sched_clock_state(void);
extern void tsc_restore_sched_clock_state(void);

/* MSR based TSC calibration for Intel Atom SoC platforms */
unsigned long try_msr_calibrate_tsc(void);

#endif /* _ASM_X86_TSC_H */
Commit	Line	Data
	1	/*
	2	* x86 TSC related functions
	3	*/
	4	#ifndef _ASM_X86_TSC_H
	5	#define _ASM_X86_TSC_H
	6
	7	#include <asm/processor.h>
	8
	9	#define NS_SCALE 10 /* 2^10, carefully chosen */
	10	#define US_SCALE 32 /* 2^32, arbitralrily chosen */
	11
	12	/*
	13	* Standard way to access the cycle counter.
	14	*/
	15	typedef unsigned long long cycles_t;
	16
	17	extern unsigned int cpu_khz;
	18	extern unsigned int tsc_khz;
	19
	20	extern void disable_TSC(void);
	21
	22	static inline cycles_t get_cycles(void)
	23	{
	24	#ifndef CONFIG_X86_TSC
	25	if (!cpu_has_tsc)
	26	return 0;
	27	#endif
	28
	29	return rdtsc();
	30	}
	31
	32	extern struct system_counterval_t convert_art_to_tsc(cycle_t art);
	33
	34	extern void tsc_init(void);
	35	extern void mark_tsc_unstable(char *reason);
	36	extern int unsynchronized_tsc(void);
	37	extern int check_tsc_unstable(void);
	38	extern int check_tsc_disabled(void);
	39	extern unsigned long native_calibrate_tsc(void);
	40	extern unsigned long long native_sched_clock_from_tsc(u64 tsc);
	41
	42	extern int tsc_clocksource_reliable;
	43
	44	/*
	45	* Boot-time check whether the TSCs are synchronized across
	46	* all CPUs/cores:
	47	*/
	48	extern void check_tsc_sync_source(int cpu);
	49	extern void check_tsc_sync_target(void);
	50
	51	extern int notsc_setup(char *);
	52	extern void tsc_save_sched_clock_state(void);
	53	extern void tsc_restore_sched_clock_state(void);
	54
	55	/* MSR based TSC calibration for Intel Atom SoC platforms */
	56	unsigned long try_msr_calibrate_tsc(void);
	57
	58	#endif /* _ASM_X86_TSC_H */