[net-next-2.6.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)
{
	unsigned long long ret = 0;

#ifndef CONFIG_X86_TSC
	if (!cpu_has_tsc)
		return 0;
#endif
	rdtscll(ret);

	return ret;
}

static __always_inline cycles_t vget_cycles(void)
{
	/*
	 * We only do VDSOs on TSC capable CPUs, so this shouldnt
	 * access boot_cpu_data (which is not VDSO-safe):
	 */
#ifndef CONFIG_X86_TSC
	if (!cpu_has_tsc)
		return 0;
#endif
	return (cycles_t)__native_read_tsc();
}

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

/*
 * 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 save_sched_clock_state(void);
extern void restore_sched_clock_state(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	unsigned long long ret = 0;
	25
	26	#ifndef CONFIG_X86_TSC
	27	if (!cpu_has_tsc)
	28	return 0;
	29	#endif
	30	rdtscll(ret);
	31
	32	return ret;
	33	}
	34
	35	static __always_inline cycles_t vget_cycles(void)
	36	{
	37	/*
	38	* We only do VDSOs on TSC capable CPUs, so this shouldnt
	39	* access boot_cpu_data (which is not VDSO-safe):
	40	*/
	41	#ifndef CONFIG_X86_TSC
	42	if (!cpu_has_tsc)
	43	return 0;
	44	#endif
	45	return (cycles_t)__native_read_tsc();
	46	}
	47
	48	extern void tsc_init(void);
	49	extern void mark_tsc_unstable(char *reason);
	50	extern int unsynchronized_tsc(void);
	51	extern int check_tsc_unstable(void);
	52	extern unsigned long native_calibrate_tsc(void);
	53
	54	/*
	55	* Boot-time check whether the TSCs are synchronized across
	56	* all CPUs/cores:
	57	*/
	58	extern void check_tsc_sync_source(int cpu);
	59	extern void check_tsc_sync_target(void);
	60
	61	extern int notsc_setup(char *);
	62	extern void save_sched_clock_state(void);
	63	extern void restore_sched_clock_state(void);
	64
	65	#endif /* _ASM_X86_TSC_H */