108 lines
2.6 KiB
C
108 lines
2.6 KiB
C
/* Copyright 2013-2014 IBM Corp.
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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
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* 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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/*
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* Timebase helpers.
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*
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* Note: Only use after the TODs are in sync !
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*/
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#ifndef __TIME_H
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#define __TIME_H
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#include <time.h>
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#ifndef __TEST__
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static inline unsigned long mftb(void)
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{
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unsigned long tb;
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/* We use a memory clobber to avoid this being
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* moved in the instruction stream
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*/
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asm volatile("mftb %0" : "=r"(tb) : : "memory");
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return tb;
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}
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#endif
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enum tb_cmpval {
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TB_ABEFOREB = -1,
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TB_AEQUALB = 0,
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TB_AAFTERB = 1
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};
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static inline enum tb_cmpval tb_compare(unsigned long a,
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unsigned long b)
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{
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if (a == b)
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return TB_AEQUALB;
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return ((long)(b - a)) > 0 ? TB_ABEFOREB : TB_AAFTERB;
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}
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/* Architected timebase */
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extern unsigned long tb_hz;
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static inline unsigned long secs_to_tb(unsigned long secs)
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{
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return secs * tb_hz;
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}
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static inline unsigned long tb_to_secs(unsigned long tb)
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{
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return tb / tb_hz;
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}
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static inline unsigned long tb_remaining_nsecs(unsigned long tb)
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{
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return tb % tb_hz;
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}
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static inline unsigned long msecs_to_tb(unsigned long msecs)
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{
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return msecs * (tb_hz / 1000);
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}
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static inline unsigned long tb_to_msecs(unsigned long tb)
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{
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return (tb * 1000) / tb_hz;
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}
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static inline unsigned long usecs_to_tb(unsigned long usecs)
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{
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return usecs * (tb_hz / 1000000);
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}
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static inline unsigned long tb_to_usecs(unsigned long tb)
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{
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return (tb * 1000000) / tb_hz;
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}
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extern unsigned long timespec_to_tb(const struct timespec *ts);
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/* time_wait - Wait a certain number of TB ticks while polling FSP */
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extern void time_wait(unsigned long duration);
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extern void time_wait_nopoll(unsigned long duration);
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/* time_wait_ms - Wait a certain number of milliseconds while polling FSP */
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extern void time_wait_ms(unsigned long ms);
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extern void time_wait_ms_nopoll(unsigned long ms);
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/* time_wait_us - Wait a certain number of microseconds while polling FSP */
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extern void time_wait_us(unsigned long us);
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extern void time_wait_us_nopoll(unsigned long us);
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/* nanosleep_nopoll - variant for use from hostservices */
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extern int nanosleep_nopoll(const struct timespec *req, struct timespec *rem);
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#endif /* __TIME_H */
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