tictac.h

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/*
 * Copyright (c) 2008
 * Embedded Brains GmbH
 * Obere Lagerstr. 30
 * D-82178 Puchheim
 * Germany
 * rtems@embedded-brains.de
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rtems.org/license/LICENSE.
 */

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;
}