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: releng/5.0/sys/powerpc/powerpc/syncicache.c 103606 2002-09-19 04:37:39Z grehan $";
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
49 #if defined(_KERNEL) || defined(_STANDALONE)
50 #ifndef CACHELINESIZE
51 #error "Must know the size of a cache line"
52 #endif
53 #else
54 static void getcachelinesize(void);
55
56 static int _cachelinesize;
57 #define CACHELINESIZE _cachelinesize
58
59 static void
60 getcachelinesize()
61 {
62 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
63 int clen;
64
65 clen = sizeof(_cachelinesize);
66
67 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]),
68 &_cachelinesize, &clen, NULL, 0) < 0 || !_cachelinesize) {
69 abort();
70 }
71 }
72 #endif
73
74 void
75 __syncicache(void *from, int len)
76 {
77 int l, off;
78 char *p;
79
80 #if !defined(_KERNEL) && !defined(_STANDALONE)
81 if (!_cachelinesize)
82 getcachelinesize();
83 #endif
84 off = (u_int)from & (CACHELINESIZE - 1);
85 l = len += off;
86 p = (char *)from - off;
87 do {
88 __asm __volatile ("dcbst 0,%0" :: "r"(p));
89 p += CACHELINESIZE;
90 } while ((l -= CACHELINESIZE) > 0);
91 __asm __volatile ("sync");
92 p = (char *)from - off;
93 do {
94 __asm __volatile ("icbi 0,%0" :: "r"(p));
95 p += CACHELINESIZE;
96 } while ((len -= CACHELINESIZE) > 0);
97 __asm __volatile ("sync; isync");
98 }
Cache object: 4b1b79eb45e6d7c70abb68b17be82e91
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