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 #include <sys/param.h>
35 #if defined(_KERNEL) || defined(_STANDALONE)
36 #include <sys/time.h>
37 #include <sys/proc.h>
38 #include <vm/vm.h>
39 #endif
40 #include <sys/sysctl.h>
41
42 #include <machine/cpu.h>
43 #include <machine/md_var.h>
44
45 #ifdef _STANDALONE
46 int cacheline_size = 32;
47 #endif
48
49 #if !defined(_KERNEL) && !defined(_STANDALONE)
50 #include <stdlib.h>
51
52 int cacheline_size = 0;
53
54 static void getcachelinesize(void);
55
56 static void
getcachelinesize(void)57 getcachelinesize(void)
58 {
59 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
60 int clen;
61
62 clen = sizeof(cacheline_size);
63
64 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]),
65 &cacheline_size, &clen, NULL, 0) < 0 || !cacheline_size) {
66 abort();
67 }
68 }
69 #endif
70
71 void
__syncicache(void * from,int len)72 __syncicache(void *from, int len)
73 {
74 int l, off;
75 char *p;
76
77 #if !defined(_KERNEL) && !defined(_STANDALONE)
78 if (!cacheline_size)
79 getcachelinesize();
80 #endif
81
82 off = (u_int)from & (cacheline_size - 1);
83 l = len += off;
84 p = (char *)from - off;
85
86 do {
87 __asm __volatile ("dcbst 0,%0" :: "r"(p));
88 p += cacheline_size;
89 } while ((l -= cacheline_size) > 0);
90 __asm __volatile ("sync");
91 p = (char *)from - off;
92 do {
93 __asm __volatile ("icbi 0,%0" :: "r"(p));
94 p += cacheline_size;
95 } while ((len -= cacheline_size) > 0);
96 __asm __volatile ("sync; isync");
97 }
98
99