/*      $OpenBSD: syncicache.c,v 1.5 2022/10/21 21:26:49 gkoehler Exp $ */

/*-
 * SPDX-License-Identifier: BSD-4-Clause
 *
 * Copyright (C) 1995-1997, 1999 Wolfgang Solfrank.
 * Copyright (C) 1995-1997, 1999 TooLs GmbH.
 * All rights reserved.
 *
 * 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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
 *
 * $NetBSD: syncicache.c,v 1.2 1999/05/05 12:36:40 tsubai Exp $
 */

#include <sys/param.h>

#include <machine/cpufunc.h>

void
__syncicache(void *from, size_t len)
{
#if 0
        size_t  by, i;

        by = cacheline_size;
        i = 0;
        do {
                __asm volatile ("dcbst %0,%1" :: "r"(from), "r"(i));
                i += by;
        } while (i < len);
        __asm volatile ("sync");
        i = 0;
        do {
                __asm volatile ("icbi %0,%1" :: "r"(from), "r"(i));
                i += by;
        } while (i < len);
        __asm volatile ("sync; isync");
#else
        sync();
        __asm volatile ("icbi 0,%0" :: "b"(from));
        isync();
#endif
}