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- /*
- * 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 (!boot_cpu_has(X86_FEATURE_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 unsigned long native_calibrate_cpu(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);
- unsigned long cpu_khz_from_msr(void);
- #endif /* _ASM_X86_TSC_H */
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