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TOMOYO Linux Cross Reference
Linux/arch/x86/include/asm/tsc.h

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  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 (!boot_cpu_has(X86_FEATURE_TSC))
 26                 return 0;
 27 #endif
 28 
 29         return rdtsc();
 30 }
 31 
 32 extern struct system_counterval_t convert_art_to_tsc(u64 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 unsigned long native_calibrate_cpu(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 #ifdef CONFIG_X86_TSC
 49 extern bool tsc_store_and_check_tsc_adjust(bool bootcpu);
 50 extern void tsc_verify_tsc_adjust(bool resume);
 51 extern void check_tsc_sync_source(int cpu);
 52 extern void check_tsc_sync_target(void);
 53 #else
 54 static inline bool tsc_store_and_check_tsc_adjust(bool bootcpu) { return false; }
 55 static inline void tsc_verify_tsc_adjust(bool resume) { }
 56 static inline void check_tsc_sync_source(int cpu) { }
 57 static inline void check_tsc_sync_target(void) { }
 58 #endif
 59 
 60 extern int notsc_setup(char *);
 61 extern void tsc_save_sched_clock_state(void);
 62 extern void tsc_restore_sched_clock_state(void);
 63 
 64 unsigned long cpu_khz_from_msr(void);
 65 
 66 #endif /* _ASM_X86_TSC_H */
 67 

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