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#ifndef _ASM_X86_TRACE_CLOCK_H
#define _ASM_X86_TRACE_CLOCK_H
/*
* linux/arch/x86/include/asm/trace-clock.h
*
* Copyright (C) 2005,2006,2008
* Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
*
* Trace clock definitions for x86.
*/
#include <linux/timex.h>
#include <linux/time.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/atomic.h>
/* Minimum duration of a probe, in cycles */
#define TRACE_CLOCK_MIN_PROBE_DURATION 200
#define TRACE_CLOCK_RES TRACE_CLOCK_MIN_PROBE_DURATION
union lttng_timespec {
struct timespec ts;
u64 lttng_ts;
};
extern cycles_t trace_clock_async_tsc_read(void);
extern int _trace_clock_is_sync;
static inline int trace_clock_is_sync(void)
{
return _trace_clock_is_sync;
}
static inline u32 trace_clock_read32(void)
{
u32 cycles;
if (likely(trace_clock_is_sync()))
cycles = (u32)get_cycles(); /* only need the 32 LSB */
else
cycles = (u32)trace_clock_async_tsc_read();
return cycles;
}
static inline u64 trace_clock_read64(void)
{
u64 cycles;
if (likely(trace_clock_is_sync()))
cycles = get_cycles();
else
cycles = trace_clock_async_tsc_read();
return cycles;
}
static inline u64 trace_clock_frequency(void)
{
return (u64)cpu_khz * 1000;
}
static inline u32 trace_clock_freq_scale(void)
{
return 1;
}
extern int get_trace_clock(void);
extern void put_trace_clock(void);
extern void set_trace_clock_is_sync(int state);
#endif /* _ASM_X86_TRACE_CLOCK_H */
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