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46 lines
993 B
C++
46 lines
993 B
C++
/** Measure time and sleep with IA-32 time-stamp counter.
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*
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* @file
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* @author Steffen Vogel <svogel2@eonerc.rwth-aachen.de>
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* @copyright 2014-2022, Institute for Automation of Complex Power Systems, EONERC
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* @license Apache License 2.0
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*********************************************************************************/
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#pragma once
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#if !(__x86_64__ || __i386__)
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#error this header is for x86 only
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#endif
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#include <cpuid.h>
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#include <cinttypes>
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#include <x86intrin.h>
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#include <villas/kernel/kernel.hpp>
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#ifndef bit_TSC
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#define bit_TSC (1 << 4)
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#endif
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#define bit_TSC_INVARIANT (1 << 8)
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#define bit_RDTSCP (1 << 27)
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struct Tsc {
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uint64_t frequency;
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bool rdtscp_supported;
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bool is_invariant;
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};
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__attribute__((unused))
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static uint64_t tsc_now(struct Tsc *t)
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{
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uint32_t tsc_aux;
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return t->rdtscp_supported
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? __rdtscp(&tsc_aux)
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: __rdtsc();
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}
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int tsc_init(struct Tsc *t) __attribute__ ((warn_unused_result));
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uint64_t tsc_rate_to_cycles(struct Tsc *t, double rate);
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