xref: /freebsd/lib/libc/powerpc/gen/syncicache.c (revision 282a3889ebf826db9839be296ff1dd903f6d6d6e)
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
35 static const char rcsid[] =
36   "$FreeBSD$";
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/cpu.h>
48 #include <machine/md_var.h>
49 
50 #if	defined(_KERNEL) || defined(_STANDALONE)
51 #ifndef	CACHELINESIZE
52 #error "Must know the size of a cache line"
53 #endif
54 #else
55 #include <stdlib.h>
56 
57 static void getcachelinesize(void);
58 
59 static int _cachelinesize;
60 #define	CACHELINESIZE	_cachelinesize
61 
62 static void
63 getcachelinesize()
64 {
65 	static int	cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
66 	int		clen;
67 
68 	clen = sizeof(_cachelinesize);
69 
70 	if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]),
71 	    &_cachelinesize, &clen, NULL, 0) < 0 || !_cachelinesize) {
72 		abort();
73 	}
74 }
75 #endif
76 
77 void
78 __syncicache(void *from, int len)
79 {
80 	int	l, off;
81 	char	*p;
82 
83 #if	!defined(_KERNEL) && !defined(_STANDALONE)
84 	if (!_cachelinesize)
85 		getcachelinesize();
86 #endif
87 	off = (u_int)from & (CACHELINESIZE - 1);
88 	l = len += off;
89 	p = (char *)from - off;
90 	do {
91 		__asm __volatile ("dcbst 0,%0" :: "r"(p));
92 		p += CACHELINESIZE;
93 	} while ((l -= CACHELINESIZE) > 0);
94 	__asm __volatile ("sync");
95 	p = (char *)from - off;
96 	do {
97 		__asm __volatile ("icbi 0,%0" :: "r"(p));
98 		p += CACHELINESIZE;
99 	} while ((len -= CACHELINESIZE) > 0);
100 	__asm __volatile ("sync; isync");
101 }
102