diff options
Diffstat (limited to 'include/asm-x86/timer.h')
-rw-r--r-- | include/asm-x86/timer.h | 63 |
1 files changed, 0 insertions, 63 deletions
diff --git a/include/asm-x86/timer.h b/include/asm-x86/timer.h deleted file mode 100644 index fb2a4ddddf3d..000000000000 --- a/include/asm-x86/timer.h +++ /dev/null | |||
@@ -1,63 +0,0 @@ | |||
1 | #ifndef _ASMi386_TIMER_H | ||
2 | #define _ASMi386_TIMER_H | ||
3 | #include <linux/init.h> | ||
4 | #include <linux/pm.h> | ||
5 | #include <linux/percpu.h> | ||
6 | |||
7 | #define TICK_SIZE (tick_nsec / 1000) | ||
8 | |||
9 | unsigned long long native_sched_clock(void); | ||
10 | unsigned long native_calibrate_tsc(void); | ||
11 | |||
12 | extern int timer_ack; | ||
13 | extern int no_timer_check; | ||
14 | extern int recalibrate_cpu_khz(void); | ||
15 | |||
16 | #ifndef CONFIG_PARAVIRT | ||
17 | #define calibrate_tsc() native_calibrate_tsc() | ||
18 | #endif | ||
19 | |||
20 | /* Accelerators for sched_clock() | ||
21 | * convert from cycles(64bits) => nanoseconds (64bits) | ||
22 | * basic equation: | ||
23 | * ns = cycles / (freq / ns_per_sec) | ||
24 | * ns = cycles * (ns_per_sec / freq) | ||
25 | * ns = cycles * (10^9 / (cpu_khz * 10^3)) | ||
26 | * ns = cycles * (10^6 / cpu_khz) | ||
27 | * | ||
28 | * Then we use scaling math (suggested by george@mvista.com) to get: | ||
29 | * ns = cycles * (10^6 * SC / cpu_khz) / SC | ||
30 | * ns = cycles * cyc2ns_scale / SC | ||
31 | * | ||
32 | * And since SC is a constant power of two, we can convert the div | ||
33 | * into a shift. | ||
34 | * | ||
35 | * We can use khz divisor instead of mhz to keep a better precision, since | ||
36 | * cyc2ns_scale is limited to 10^6 * 2^10, which fits in 32 bits. | ||
37 | * (mathieu.desnoyers@polymtl.ca) | ||
38 | * | ||
39 | * -johnstul@us.ibm.com "math is hard, lets go shopping!" | ||
40 | */ | ||
41 | |||
42 | DECLARE_PER_CPU(unsigned long, cyc2ns); | ||
43 | |||
44 | #define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */ | ||
45 | |||
46 | static inline unsigned long long __cycles_2_ns(unsigned long long cyc) | ||
47 | { | ||
48 | return cyc * per_cpu(cyc2ns, smp_processor_id()) >> CYC2NS_SCALE_FACTOR; | ||
49 | } | ||
50 | |||
51 | static inline unsigned long long cycles_2_ns(unsigned long long cyc) | ||
52 | { | ||
53 | unsigned long long ns; | ||
54 | unsigned long flags; | ||
55 | |||
56 | local_irq_save(flags); | ||
57 | ns = __cycles_2_ns(cyc); | ||
58 | local_irq_restore(flags); | ||
59 | |||
60 | return ns; | ||
61 | } | ||
62 | |||
63 | #endif | ||