2007-03-06 17:42:05 +08:00
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/*
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2007-10-13 05:04:23 +08:00
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* x86 TSC related functions
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2007-03-06 17:42:05 +08:00
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*/
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2008-10-23 13:26:29 +08:00
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#ifndef _ASM_X86_TSC_H
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#define _ASM_X86_TSC_H
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2007-03-06 17:42:05 +08:00
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#include <asm/processor.h>
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2007-10-13 05:04:23 +08:00
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#define NS_SCALE 10 /* 2^10, carefully chosen */
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#define US_SCALE 32 /* 2^32, arbitralrily chosen */
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2007-03-06 17:42:05 +08:00
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/*
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* Standard way to access the cycle counter.
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*/
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typedef unsigned long long cycles_t;
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extern unsigned int cpu_khz;
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extern unsigned int tsc_khz;
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2008-01-30 20:31:26 +08:00
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extern void disable_TSC(void);
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2007-03-06 17:42:05 +08:00
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static inline cycles_t get_cycles(void)
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{
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unsigned long long ret = 0;
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#ifndef CONFIG_X86_TSC
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if (!cpu_has_tsc)
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return 0;
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#endif
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rdtscll(ret);
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2008-01-30 20:33:24 +08:00
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2007-03-06 17:42:05 +08:00
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return ret;
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}
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2008-04-27 07:39:36 +08:00
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static __always_inline cycles_t vget_cycles(void)
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2007-03-06 17:42:05 +08:00
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{
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2007-05-03 01:27:21 +08:00
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/*
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2008-01-30 20:32:39 +08:00
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* We only do VDSOs on TSC capable CPUs, so this shouldnt
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* access boot_cpu_data (which is not VDSO-safe):
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2007-05-03 01:27:21 +08:00
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*/
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2008-01-30 20:32:39 +08:00
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#ifndef CONFIG_X86_TSC
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if (!cpu_has_tsc)
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return 0;
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2008-01-30 20:31:03 +08:00
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#endif
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2008-03-23 16:03:47 +08:00
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return (cycles_t)__native_read_tsc();
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2008-01-30 20:32:39 +08:00
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}
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2008-01-30 20:31:03 +08:00
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2007-03-06 17:42:05 +08:00
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extern void tsc_init(void);
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2007-05-03 01:27:08 +08:00
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extern void mark_tsc_unstable(char *reason);
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2007-03-06 17:42:05 +08:00
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extern int unsynchronized_tsc(void);
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2007-07-19 16:49:23 +08:00
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int check_tsc_unstable(void);
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2007-03-06 17:42:05 +08:00
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/*
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* Boot-time check whether the TSCs are synchronized across
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* all CPUs/cores:
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*/
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extern void check_tsc_sync_source(int cpu);
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extern void check_tsc_sync_target(void);
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2008-01-30 20:30:18 +08:00
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extern int notsc_setup(char *);
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2007-10-13 05:04:06 +08:00
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2008-10-23 13:26:29 +08:00
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#endif /* _ASM_X86_TSC_H */
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