forked from Imagelibrary/rtems
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/* SPDX-License-Identifier: BSD-2-Clause */
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/**
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* @file
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*
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* @ingroup RTEMSBSPsPowerPCShared
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*
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* @brief Header file for tic-tac code.
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*/
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/*
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* Copyright (c) 2008 embedded brains GmbH & Co. KG
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @brief Reset reference ticks for tac().
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*/
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static inline void tic(void)
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{
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uint32_t tmp;
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__asm__ volatile (
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"mftb 0;"
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"stw 0, ppc_tic_tac@sdarel(13);"
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: "=r" (tmp)
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);
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}
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/**
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* @brief Returns number of ticks since last tic().
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*/
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static inline uint32_t tac(void)
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{
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uint32_t ticks;
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uint32_t tmp;
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__asm__ volatile (
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"mftb %0;"
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"lwz %1, ppc_tic_tac@sdarel(13);"
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"subf %0, %1, %0;"
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: "=r" (ticks), "=r" (tmp)
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);
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return ticks;
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}
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/**
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* @brief Reset reference ticks for bam().
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*/
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static inline void boom(void)
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{
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uint32_t tmp;
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__asm__ volatile (
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"mftb 0;"
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"stw 0, ppc_boom_bam@sdarel(13);"
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: "=r" (tmp)
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);
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}
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/**
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* @brief Returns number of ticks since last boom().
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*/
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static inline uint32_t bam(void)
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{
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uint32_t ticks;
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uint32_t tmp;
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__asm__ volatile (
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"mftb %0;"
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"lwz %1, ppc_boom_bam@sdarel(13);"
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"subf %0, %1, %0;"
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: "=r" (ticks), "=r" (tmp)
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);
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return ticks;
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}
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