Differential D28723 Diff 84233 sys/cddl/dev/dtrace/aarch64/dtrace_subr.c

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sys/cddl/dev/dtrace/aarch64/dtrace_subr.c

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	void			void
	dtrace_sync(void)			dtrace_sync(void)
	{			{

	dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL);			dtrace_xcall(DTRACE_CPUALL, (dtrace_xcall_t)dtrace_sync_func, NULL);
	}			}

	/*			/*
	* DTrace needs a high resolution time function which can			* DTrace needs a high resolution time function which can be called from a
	* be called from a probe context and guaranteed not to have			* probe context and guaranteed not to have instrumented with probes itself.
	* instrumented with probes itself.
	*			*
	* Returns nanoseconds since boot.			* Returns nanoseconds since some arbitrary point in time (likely SoC reset?).
	*/			*/
	uint64_t			uint64_t
	dtrace_gethrtime()			dtrace_gethrtime(void)
	{			{
	struct timespec curtime;			uint64_t count, freq;

	dtrace_getnanouptime(&curtime);			count = READ_SPECIALREG(cntvct_el0);
				andrewUnsubmitted Done Inline Actions This is a generic counter, it may not be a cycle count in all implementations. andrew: This is a generic counter, it may not be a cycle count in all implementations.
				emasteUnsubmitted Done Inline Actions Maybe just `count`? emaste: Maybe just `count`?
				freq = READ_SPECIALREG(cntfrq_el0);
	return (curtime.tv_sec * 1000000000UL + curtime.tv_nsec);			return ((1000000000UL * count) / freq);

	}			}

				/*
				* Return a much lower resolution wallclock time based on the system clock
				* updated by the timer. If needed, we could add a version interpolated from
				* the system clock as is the case with dtrace_gethrtime().
				*/
	uint64_t			uint64_t
	dtrace_gethrestime(void)			dtrace_gethrestime(void)
	{			{
	struct timespec current_time;			struct timespec current_time;

	dtrace_getnanotime(&current_time);			dtrace_getnanotime(&current_time);

	return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec);			return (current_time.tv_sec * 1000000000UL + current_time.tv_nsec);
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