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https://github.com/RT-Thread/rt-thread.git
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ecf2d82159
* Synchronize the code of the rt mart branch to the master branch.
* TTY device
* Add lwP code from rt-smart
* Add vnode in DFS, but DFS will be re-write for rt-smart
* There are three libcpu for rt-smart:
* arm/cortex-a, arm/aarch64
* riscv64
Co-authored-by: Rbb666 <zhangbingru@rt-thread.com>
Co-authored-by: zhkag <zhkag@foxmail.com>
92 lines
1.9 KiB
C
92 lines
1.9 KiB
C
/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2017-12-23 Bernard first version
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*/
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#include <rtdevice.h>
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#include <rtthread.h>
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#include <sys/errno.h>
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static const struct rt_clock_cputime_ops *_cputime_ops = RT_NULL;
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/**
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* The clock_cpu_getres() function shall return the resolution of CPU time, the
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* number of nanosecond per tick.
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*
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* @return the number of nanosecond per tick
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*/
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float clock_cpu_getres(void)
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{
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if (_cputime_ops)
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return _cputime_ops->cputime_getres();
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rt_set_errno(ENOSYS);
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return 0;
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}
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/**
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* The clock_cpu_gettime() function shall return the current value of cpu time tick.
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*
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* @return the cpu tick
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*/
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uint64_t clock_cpu_gettime(void)
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{
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if (_cputime_ops)
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return _cputime_ops->cputime_gettime();
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rt_set_errno(ENOSYS);
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return 0;
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}
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/**
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* The clock_cpu_microsecond() fucntion shall return the microsecond according to
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* cpu_tick parameter.
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*
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* @param cpu_tick the cpu tick
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*
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* @return the microsecond
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*/
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uint64_t clock_cpu_microsecond(uint64_t cpu_tick)
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{
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float unit = clock_cpu_getres();
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return (uint64_t)((cpu_tick * unit) / 1000);
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}
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/**
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* The clock_cpu_microsecond() fucntion shall return the millisecond according to
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* cpu_tick parameter.
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*
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* @param cpu_tick the cpu tick
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*
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* @return the millisecond
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*/
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uint64_t clock_cpu_millisecond(uint64_t cpu_tick)
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{
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float unit = clock_cpu_getres();
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return (uint64_t)((cpu_tick * unit) / (1000 * 1000));
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}
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/**
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* The clock_cpu_seops() function shall set the ops of cpu time.
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*
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* @return always return 0.
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*/
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int clock_cpu_setops(const struct rt_clock_cputime_ops *ops)
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{
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_cputime_ops = ops;
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if (ops)
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{
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RT_ASSERT(ops->cputime_getres != RT_NULL);
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RT_ASSERT(ops->cputime_gettime != RT_NULL);
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}
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return 0;
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}
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