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35 lines
844 B
C
35 lines
844 B
C
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/*
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* Copyright 2017 JP Bonn
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup cpu_fe310
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* @{
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*
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* @file cpu_cycle.c
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* @brief Read CPU cycle counter
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*
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* @author JP Bonn
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* @}
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*/
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#include "cpucycle.h"
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#include "vendor/encoding.h"
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uint64_t get_cycle_count(void)
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{
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uint32_t lo, hi, hi2;
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__asm__ __volatile__ ("1:\n\t" \
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"csrr %0, mcycleh\n\t" \
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"csrr %1, mcycle\n\t" \
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"csrr %2, mcycleh\n\t" \
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"bne %0, %2, 1b\n\t" \
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: "=r" (hi), "=r" (lo), "=r" (hi2));
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return lo | ((uint64_t) hi << 32);
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}
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