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41 lines
925 B
C++
41 lines
925 B
C++
/* Measure time and sleep with IA-32 time-stamp counter.
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*
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* Author: Steffen Vogel <post@steffenvogel.de>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-License-Identifier: Apache-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 <cinttypes>
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#include <cpuid.h>
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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)) static uint64_t tsc_now(struct Tsc *t) {
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uint32_t tsc_aux;
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return t->rdtscp_supported ? __rdtscp(&tsc_aux) : __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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