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