2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (C) 1995-1997, 1999 Wolfgang Solfrank.
5 * Copyright (C) 1995-1997, 1999 TooLs GmbH.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by TooLs GmbH.
19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 * $NetBSD: syncicache.c,v 1.2 1999/05/05 12:36:40 tsubai Exp $
37 static const char rcsid[] =
41 #include <sys/param.h>
42 #if defined(_KERNEL) || defined(_STANDALONE)
47 #include <sys/sysctl.h>
49 #include <machine/cpu.h>
50 #include <machine/md_var.h>
53 int cacheline_size = 32;
56 #if !defined(_KERNEL) && !defined(_STANDALONE)
59 int cacheline_size = 0;
61 static void getcachelinesize(void);
66 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
69 clen = sizeof(cacheline_size);
71 if (sysctl(cachemib, nitems(cachemib), &cacheline_size, &clen,
72 NULL, 0) < 0 || !cacheline_size) {
79 __syncicache(void *from, int len)
84 #if !defined(_KERNEL) && !defined(_STANDALONE)
89 off = (uintptr_t)from & (cacheline_size - 1);
91 p = (char *)from - off;
94 __asm __volatile ("dcbst 0,%0" :: "r"(p));
96 } while ((l -= cacheline_size) > 0);
97 __asm __volatile ("sync");
98 p = (char *)from - off;
100 __asm __volatile ("icbi 0,%0" :: "r"(p));
102 } while ((len -= cacheline_size) > 0);
103 __asm __volatile ("sync; isync");