38 lines
808 B
C
38 lines
808 B
C
/*
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* Copyright (c) 2018 Intel Corporation
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <kernel.h>
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#include <errno.h>
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#include <posix/time.h>
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#include <posix/sys/types.h>
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/**
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* @brief Get clock time specified by clock_id.
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*
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* See IEEE 1003.1
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*/
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int clock_gettime(clockid_t clock_id, struct timespec *ts)
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{
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s64_t elapsed_msecs, elapsed_secs;
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s64_t elapsed_nsec, elapsed_cycles;
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if (clock_id != CLOCK_MONOTONIC) {
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errno = EINVAL;
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return -1;
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}
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elapsed_msecs = k_uptime_get();
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elapsed_secs = elapsed_msecs / MSEC_PER_SEC;
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elapsed_cycles = (s64_t) (k_cycle_get_32() %
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sys_clock_hw_cycles_per_sec);
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elapsed_nsec = (s64_t) ((elapsed_cycles * NSEC_PER_SEC) /
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sys_clock_hw_cycles_per_sec);
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ts->tv_sec = (s32_t) elapsed_secs;
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ts->tv_nsec = (s32_t) elapsed_nsec;
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return 0;
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}
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