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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         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 shouldn't
 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 extern int tsc_clocksource_reliable;
 55 
 56 /*
 57  * Boot-time check whether the TSCs are synchronized across
 58  * all CPUs/cores:
 59  */
 60 extern void check_tsc_sync_source(int cpu);
 61 extern void check_tsc_sync_target(void);
 62 
 63 extern int notsc_setup(char *);
 64 extern void tsc_save_sched_clock_state(void);
 65 extern void tsc_restore_sched_clock_state(void);
 66 
 67 #endif /* _ASM_X86_TSC_H */
 68 

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