syncicache.c revision 170484 
1/*
2 * Copyright (C) 1995-1997, 1999 Wolfgang Solfrank.
3 * Copyright (C) 1995-1997, 1999 TooLs GmbH.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *	This product includes software developed by TooLs GmbH.
17 * 4. The name of TooLs GmbH may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 *
31 * $NetBSD: syncicache.c,v 1.2 1999/05/05 12:36:40 tsubai Exp $
32 */
33
34#ifndef lint
35static const char rcsid[] =
36  "$FreeBSD: head/lib/libc/powerpc/gen/syncicache.c 170484 2007-06-10 03:13:56Z marcel $";
37#endif /* not lint */
38
39#include <sys/param.h>
40#if	defined(_KERNEL) || defined(_STANDALONE)
41#include <sys/time.h>
42#include <sys/proc.h>
43#include <vm/vm.h>
44#endif
45#include <sys/sysctl.h>
46
47#include <machine/md_var.h>
48
49#if	defined(_KERNEL) || defined(_STANDALONE)
50#ifndef	CACHELINESIZE
51#error "Must know the size of a cache line"
52#endif
53#else
54#include <stdlib.h>
55
56static void getcachelinesize(void);
57
58static int _cachelinesize;
59#define	CACHELINESIZE	_cachelinesize
60
61static void
62getcachelinesize()
63{
64	static int	cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
65	int		clen;
66
67	clen = sizeof(_cachelinesize);
68
69	if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]),
70	    &_cachelinesize, &clen, NULL, 0) < 0 || !_cachelinesize) {
71		abort();
72	}
73}
74#endif
75
76void
77__syncicache(void *from, int len)
78{
79	int	l, off;
80	char	*p;
81
82#if	!defined(_KERNEL) && !defined(_STANDALONE)
83	if (!_cachelinesize)
84		getcachelinesize();
85#endif
86	off = (u_int)from & (CACHELINESIZE - 1);
87	l = len += off;
88	p = (char *)from - off;
89	do {
90		__asm __volatile ("dcbst 0,%0" :: "r"(p));
91		p += CACHELINESIZE;
92	} while ((l -= CACHELINESIZE) > 0);
93	__asm __volatile ("sync");
94	p = (char *)from - off;
95	do {
96		__asm __volatile ("icbi 0,%0" :: "r"(p));
97		p += CACHELINESIZE;
98	} while ((len -= CACHELINESIZE) > 0);
99	__asm __volatile ("sync; isync");
100}
101