diff options
Diffstat (limited to 'include/asm-x86_64')
-rw-r--r-- | include/asm-x86_64/tsc.h | 68 |
1 files changed, 1 insertions, 67 deletions
diff --git a/include/asm-x86_64/tsc.h b/include/asm-x86_64/tsc.h index 26c3e9828288..d66ba6ef25f6 100644 --- a/include/asm-x86_64/tsc.h +++ b/include/asm-x86_64/tsc.h | |||
@@ -1,67 +1 @@ | |||
1 | /* | #include <asm-i386/tsc.h> | |
2 | * linux/include/asm-x86_64/tsc.h | ||
3 | * | ||
4 | * x86_64 TSC related functions | ||
5 | */ | ||
6 | #ifndef _ASM_x86_64_TSC_H | ||
7 | #define _ASM_x86_64_TSC_H | ||
8 | |||
9 | #include <asm/processor.h> | ||
10 | |||
11 | /* | ||
12 | * Standard way to access the cycle counter. | ||
13 | */ | ||
14 | typedef unsigned long long cycles_t; | ||
15 | |||
16 | extern unsigned int cpu_khz; | ||
17 | extern unsigned int tsc_khz; | ||
18 | |||
19 | static inline cycles_t get_cycles(void) | ||
20 | { | ||
21 | unsigned long long ret = 0; | ||
22 | |||
23 | #ifndef CONFIG_X86_TSC | ||
24 | if (!cpu_has_tsc) | ||
25 | return 0; | ||
26 | #endif | ||
27 | |||
28 | #if defined(CONFIG_X86_GENERIC) || defined(CONFIG_X86_TSC) | ||
29 | rdtscll(ret); | ||
30 | #endif | ||
31 | return ret; | ||
32 | } | ||
33 | |||
34 | /* Like get_cycles, but make sure the CPU is synchronized. */ | ||
35 | static __always_inline cycles_t get_cycles_sync(void) | ||
36 | { | ||
37 | unsigned long long ret; | ||
38 | #ifdef X86_FEATURE_SYNC_RDTSC | ||
39 | unsigned eax; | ||
40 | |||
41 | /* | ||
42 | * Don't do an additional sync on CPUs where we know | ||
43 | * RDTSC is already synchronous: | ||
44 | */ | ||
45 | alternative_io("cpuid", ASM_NOP2, X86_FEATURE_SYNC_RDTSC, | ||
46 | "=a" (eax), "0" (1) : "ebx","ecx","edx","memory"); | ||
47 | #else | ||
48 | sync_core(); | ||
49 | #endif | ||
50 | rdtscll(ret); | ||
51 | |||
52 | return ret; | ||
53 | } | ||
54 | |||
55 | extern void tsc_init(void); | ||
56 | extern void mark_tsc_unstable(void); | ||
57 | extern int unsynchronized_tsc(void); | ||
58 | extern void init_tsc_clocksource(void); | ||
59 | |||
60 | /* | ||
61 | * Boot-time check whether the TSCs are synchronized across | ||
62 | * all CPUs/cores: | ||
63 | */ | ||
64 | extern void check_tsc_sync_source(int cpu); | ||
65 | extern void check_tsc_sync_target(void); | ||
66 | |||
67 | #endif | ||