components/drivers/ktime/src/risc-v/virt64/cputimer.c


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/*
 * Copyright (c) 2006-2023, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2023-07-10     xqyjlj       The first version.
 */

#include "ktime.h"

static volatile unsigned long _init_cnt = 0;

rt_uint64_t rt_ktime_cputimer_getres(void)
{
    return ((1000ULL * 1000 * 1000) * RT_KTIME_RESMUL) / CPUTIME_TIMER_FREQ;
}

unsigned long rt_ktime_cputimer_getfrq(void)
{
    return CPUTIME_TIMER_FREQ;
}

unsigned long rt_ktime_cputimer_getcnt(void)
{
    unsigned long time_elapsed;
    __asm__ __volatile__("rdtime %0" : "=r"(time_elapsed));
    return time_elapsed - _init_cnt;
}

unsigned long rt_ktime_cputimer_getstep(void)
{
    return rt_ktime_cputimer_getfrq() / RT_TICK_PER_SECOND;
}

void rt_ktime_cputimer_init(void)
{
    __asm__ __volatile__("rdtime %0" : "=r"(_init_cnt));
}