tictac.h

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/* SPDX-License-Identifier: BSD-2-Clause */
 
/*
 * 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.
 */
 
static inline void tic(void)
{
    uint32_t tmp;
    __asm__ volatile (
        "mftb 0;"
        "stw 0, ppc_tic_tac@sdarel(13);"
        : "=r" (tmp)
    );
}
 
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;
}
 
static inline void boom(void)
{
    uint32_t tmp;
    __asm__ volatile (
        "mftb 0;"
        "stw 0, ppc_boom_bam@sdarel(13);"
        : "=r" (tmp)
    );
}
 
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;
}