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Commit | Line | Data |
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2272b0e0 | 1 | /* |
2f0798a3 | 2 | * x86 TSC related functions |
2272b0e0 | 3 | */ |
1965aae3 PA |
4 | #ifndef _ASM_X86_TSC_H |
5 | #define _ASM_X86_TSC_H | |
2272b0e0 AS |
6 | |
7 | #include <asm/processor.h> | |
8 | ||
2f0798a3 TG |
9 | #define NS_SCALE 10 /* 2^10, carefully chosen */ |
10 | #define US_SCALE 32 /* 2^32, arbitralrily chosen */ | |
11 | ||
2272b0e0 AS |
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; | |
73018a66 GOC |
19 | |
20 | extern void disable_TSC(void); | |
2272b0e0 AS |
21 | |
22 | static inline cycles_t get_cycles(void) | |
23 | { | |
2272b0e0 AS |
24 | #ifndef CONFIG_X86_TSC |
25 | if (!cpu_has_tsc) | |
26 | return 0; | |
27 | #endif | |
2272b0e0 | 28 | |
4ea1636b | 29 | return rdtsc(); |
6d63de8d | 30 | } |
4e87173e | 31 | |
2272b0e0 | 32 | extern void tsc_init(void); |
5a90cf20 | 33 | extern void mark_tsc_unstable(char *reason); |
2272b0e0 | 34 | extern int unsynchronized_tsc(void); |
2d826404 | 35 | extern int check_tsc_unstable(void); |
c73deb6a | 36 | extern int check_tsc_disabled(void); |
2d826404 | 37 | extern unsigned long native_calibrate_tsc(void); |
a94cab23 | 38 | extern unsigned long long native_sched_clock_from_tsc(u64 tsc); |
2272b0e0 | 39 | |
28a00184 SS |
40 | extern int tsc_clocksource_reliable; |
41 | ||
2272b0e0 AS |
42 | /* |
43 | * Boot-time check whether the TSCs are synchronized across | |
44 | * all CPUs/cores: | |
45 | */ | |
46 | extern void check_tsc_sync_source(int cpu); | |
47 | extern void check_tsc_sync_target(void); | |
48 | ||
80ca9c98 | 49 | extern int notsc_setup(char *); |
b74f05d6 MT |
50 | extern void tsc_save_sched_clock_state(void); |
51 | extern void tsc_restore_sched_clock_state(void); | |
d371698e | 52 | |
7da7c156 | 53 | /* MSR based TSC calibration for Intel Atom SoC platforms */ |
5f0e0309 | 54 | unsigned long try_msr_calibrate_tsc(void); |
7da7c156 | 55 | |
1965aae3 | 56 | #endif /* _ASM_X86_TSC_H */ |