include/bsp/tictac.h

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup RTEMSBSPsPowerPCShared
0007  *
0008  * @brief Header file for tic-tac code.
0009  */
0010
0011 /*
0012  * Copyright (c) 2008 embedded brains GmbH & Co. KG
0013  * Redistribution and use in source and binary forms, with or without
0014  * modification, are permitted provided that the following conditions
0015  * are met:
0016  * 1. Redistributions of source code must retain the above copyright
0017  *    notice, this list of conditions and the following disclaimer.
0018  * 2. Redistributions in binary form must reproduce the above copyright
0019  *    notice, this list of conditions and the following disclaimer in the
0020  *    documentation and/or other materials provided with the distribution.
0021  *
0022  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0023  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0024  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0025  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0026  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0027  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0028  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0029  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0030  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0031  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0032  * POSSIBILITY OF SUCH DAMAGE.
0033  */
0034
0035 /**
0036  * @brief Reset reference ticks for tac().
0037  */
0038 static inline void tic(void)
0039 {
0040     uint32_t tmp;
0041     __asm__ volatile (
0042         "mftb 0;"
0043         "stw 0, ppc_tic_tac@sdarel(13);"
0044         : "=r" (tmp)
0045     );
0046 }
0047
0048 /**
0049  * @brief Returns number of ticks since last tic().
0050  */
0051 static inline uint32_t tac(void)
0052 {
0053     uint32_t ticks;
0054     uint32_t tmp;
0055     __asm__ volatile (
0056         "mftb %0;"
0057         "lwz %1, ppc_tic_tac@sdarel(13);"
0058         "subf %0, %1, %0;"
0059         : "=r" (ticks), "=r" (tmp)
0060     );
0061     return ticks;
0062 }
0063
0064 /**
0065  * @brief Reset reference ticks for bam().
0066  */
0067 static inline void boom(void)
0068 {
0069     uint32_t tmp;
0070     __asm__ volatile (
0071         "mftb 0;"
0072         "stw 0, ppc_boom_bam@sdarel(13);"
0073         : "=r" (tmp)
0074     );
0075 }
0076
0077 /**
0078  * @brief Returns number of ticks since last boom().
0079  */
0080 static inline uint32_t bam(void)
0081 {
0082     uint32_t ticks;
0083     uint32_t tmp;
0084     __asm__ volatile (
0085         "mftb %0;"
0086         "lwz %1, ppc_boom_bam@sdarel(13);"
0087         "subf %0, %1, %0;"
0088         : "=r" (ticks), "=r" (tmp)
0089     );
0090     return ticks;
0091 }