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- /* SPDX-License-Identifier: GPL-2.0 */
- /*
- * x86 TSC related functions
- */
- #ifndef _ASM_X86_TSC_H
- #define _ASM_X86_TSC_H
- #include <asm/processor.h>
- #include <asm/cpufeature.h>
- /*
- * 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)
- {
- if (!IS_ENABLED(CONFIG_X86_TSC) &&
- !cpu_feature_enabled(X86_FEATURE_TSC))
- return 0;
- return rdtsc();
- }
- #define get_cycles get_cycles
- extern struct system_counterval_t convert_art_to_tsc(u64 art);
- extern struct system_counterval_t convert_art_ns_to_tsc(u64 art_ns);
- extern void tsc_early_init(void);
- extern void tsc_init(void);
- extern unsigned long calibrate_delay_is_known(void);
- extern void mark_tsc_unstable(char *reason);
- extern int unsynchronized_tsc(void);
- extern int check_tsc_unstable(void);
- extern void mark_tsc_async_resets(char *reason);
- extern unsigned long native_calibrate_cpu_early(void);
- extern unsigned long native_calibrate_tsc(void);
- extern unsigned long long native_sched_clock_from_tsc(u64 tsc);
- extern int tsc_clocksource_reliable;
- #ifdef CONFIG_X86_TSC
- extern bool tsc_async_resets;
- #else
- # define tsc_async_resets false
- #endif
- /*
- * Boot-time check whether the TSCs are synchronized across
- * all CPUs/cores:
- */
- #ifdef CONFIG_X86_TSC
- extern bool tsc_store_and_check_tsc_adjust(bool bootcpu);
- extern void tsc_verify_tsc_adjust(bool resume);
- extern void check_tsc_sync_source(int cpu);
- extern void check_tsc_sync_target(void);
- #else
- static inline bool tsc_store_and_check_tsc_adjust(bool bootcpu) { return false; }
- static inline void tsc_verify_tsc_adjust(bool resume) { }
- static inline void check_tsc_sync_source(int cpu) { }
- static inline void check_tsc_sync_target(void) { }
- #endif
- 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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