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103 lines
2.1 KiB
C
103 lines
2.1 KiB
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 <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2018, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLAScommon
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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#pragma once
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#include <stdbool.h>
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#include <cpuid.h>
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#include <inttypes.h>
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#ifdef __APPLE__
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#endif
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#include <villas/kernel/kernel.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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#if !(__x86_64__ || __i386__)
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#error this header is for x86 only
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#endif
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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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/** Get CPU timestep counter */
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__attribute__((unused,always_inline))
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static inline uint64_t rdtscp()
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{
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uint64_t tsc;
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__asm__ __volatile__(
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"rdtscp;"
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"shl $32, %%rdx;"
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"or %%rdx,%%rax"
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: "=a" (tsc)
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:
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: "%rcx", "%rdx", "memory"
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);
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return tsc;
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}
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__attribute__((unused,always_inline))
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static inline uint64_t rdtsc()
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{
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uint64_t tsc;
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__asm__ __volatile__(
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"lfence;"
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"rdtsc;"
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"shl $32, %%rdx;"
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"or %%rdx,%%rax"
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: "=a" (tsc)
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:
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: "%rcx", "%rdx", "memory"
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);
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return tsc;
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}
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int tsc_init(struct tsc *t);
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uint64_t tsc_rate_to_cycles(struct tsc *t, double rate);
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uint64_t tsc_now(struct tsc *t);
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#ifdef __cplusplus
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}
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#endif
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