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author | Ingo Molnar <mingo@elte.hu> | 2008-10-24 12:48:46 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-10-24 12:48:46 +0200 |
commit | 8c82a17e9c924c0e9f13e75e4c2f6bca19a4b516 (patch) | |
tree | d535f46a917e14e90deccb29ad00aac016ad18dd /include/asm-x86/timer.h | |
parent | 4ce72a2c063a7fa8e42a9435440ae3364115a58d (diff) | |
parent | 57f8f7b60db6f1ed2c6918ab9230c4623a9dbe37 (diff) |
Merge commit 'v2.6.28-rc1' into sched/urgent
Diffstat (limited to 'include/asm-x86/timer.h')
-rw-r--r-- | include/asm-x86/timer.h | 66 |
1 files changed, 0 insertions, 66 deletions
diff --git a/include/asm-x86/timer.h b/include/asm-x86/timer.h deleted file mode 100644 index d0babce4b47..00000000000 --- a/include/asm-x86/timer.h +++ /dev/null @@ -1,66 +0,0 @@ -#ifndef ASM_X86__TIMER_H -#define ASM_X86__TIMER_H -#include <linux/init.h> -#include <linux/pm.h> -#include <linux/percpu.h> - -#define TICK_SIZE (tick_nsec / 1000) - -unsigned long long native_sched_clock(void); -unsigned long native_calibrate_tsc(void); - -#ifdef CONFIG_X86_32 -extern int timer_ack; -extern int recalibrate_cpu_khz(void); -#endif /* CONFIG_X86_32 */ - -extern int no_timer_check; - -#ifndef CONFIG_PARAVIRT -#define calibrate_tsc() native_calibrate_tsc() -#endif - -/* Accelerators for sched_clock() - * convert from cycles(64bits) => nanoseconds (64bits) - * basic equation: - * ns = cycles / (freq / ns_per_sec) - * ns = cycles * (ns_per_sec / freq) - * ns = cycles * (10^9 / (cpu_khz * 10^3)) - * ns = cycles * (10^6 / cpu_khz) - * - * Then we use scaling math (suggested by george@mvista.com) to get: - * ns = cycles * (10^6 * SC / cpu_khz) / SC - * ns = cycles * cyc2ns_scale / SC - * - * And since SC is a constant power of two, we can convert the div - * into a shift. - * - * We can use khz divisor instead of mhz to keep a better precision, since - * cyc2ns_scale is limited to 10^6 * 2^10, which fits in 32 bits. - * (mathieu.desnoyers@polymtl.ca) - * - * -johnstul@us.ibm.com "math is hard, lets go shopping!" - */ - -DECLARE_PER_CPU(unsigned long, cyc2ns); - -#define CYC2NS_SCALE_FACTOR 10 /* 2^10, carefully chosen */ - -static inline unsigned long long __cycles_2_ns(unsigned long long cyc) -{ - return cyc * per_cpu(cyc2ns, smp_processor_id()) >> CYC2NS_SCALE_FACTOR; -} - -static inline unsigned long long cycles_2_ns(unsigned long long cyc) -{ - unsigned long long ns; - unsigned long flags; - - local_irq_save(flags); - ns = __cycles_2_ns(cyc); - local_irq_restore(flags); - - return ns; -} - -#endif /* ASM_X86__TIMER_H */ |