syncicache.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (C) 1995-1997, 1999 Wolfgang Solfrank.
5 * Copyright (C) 1995-1997, 1999 TooLs GmbH.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
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.
21 *
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.
32 *
33 * $NetBSD: syncicache.c,v 1.2 1999/05/05 12:36:40 tsubai Exp $
34 */
35
36#ifndef lint
37static const char rcsid[] =
38  "$FreeBSD: stable/11/lib/libc/powerpc64/gen/syncicache.c 330897 2018-03-14 03:19:51Z eadler $";
39#endif /* not lint */
40
41#include <sys/param.h>
42#if	defined(_KERNEL) || defined(_STANDALONE)
43#include <sys/time.h>
44#include <sys/proc.h>
45#include <vm/vm.h>
46#endif
47#include <sys/sysctl.h>
48
49#include <machine/cpu.h>
50#include <machine/md_var.h>
51
52#ifdef _STANDALONE
53int cacheline_size = 32;
54#endif
55
56#if	!defined(_KERNEL) && !defined(_STANDALONE)
57#include <stdlib.h>
58
59int cacheline_size = 0;
60
61static void getcachelinesize(void);
62
63static void
64getcachelinesize()
65{
66	static int	cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
67	long		clen;
68
69	clen = sizeof(cacheline_size);
70
71	if (sysctl(cachemib, nitems(cachemib), &cacheline_size, &clen,
72	    NULL, 0) < 0 || !cacheline_size) {
73		abort();
74	}
75}
76#endif
77
78void
79__syncicache(void *from, int len)
80{
81	off_t	l, off;
82	char	*p;
83
84#if	!defined(_KERNEL) && !defined(_STANDALONE)
85	if (!cacheline_size)
86		getcachelinesize();
87#endif
88
89	off = (uintptr_t)from & (cacheline_size - 1);
90	l = len += off;
91	p = (char *)from - off;
92
93	do {
94		__asm __volatile ("dcbst 0,%0" :: "r"(p));
95		p += cacheline_size;
96	} while ((l -= cacheline_size) > 0);
97	__asm __volatile ("sync");
98	p = (char *)from - off;
99	do {
100		__asm __volatile ("icbi 0,%0" :: "r"(p));
101		p += cacheline_size;
102	} while ((len -= cacheline_size) > 0);
103	__asm __volatile ("sync; isync");
104}
105
106