39 lines
1000 B
C
39 lines
1000 B
C
/* Copyright 2018 Canaan Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "sleep.h"
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#include "sysctl.h"
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int usleep(uint64_t usec)
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{
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uint64_t nop_all = usec * sysctl_clock_get_freq(SYSCTL_CLOCK_CPU) / 1000000UL / 6;
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while (nop_all--)
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{
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asm volatile("nop");
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}
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return 0;
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}
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int msleep(uint64_t msec)
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{
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return (unsigned int)usleep(msec * 1000);
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}
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unsigned int sleep(unsigned int seconds)
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{
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return (unsigned int)msleep(seconds * 1000);
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}
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