1 /* $NetBSD: syncicache.c,v 1.15 2008/03/18 20:11:43 he Exp $ */
2
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 #include <sys/param.h>
34 #if defined(_KERNEL)
35 #include <sys/time.h>
36 #include <sys/proc.h>
37 #include <uvm/uvm_extern.h>
38 #endif
39 #if !defined(_STANDALONE)
40 #include <sys/sysctl.h>
41 #endif
42
43 #include <machine/cpu.h>
44
45
46 #if defined(_STANDALONE)
47 #ifndef CACHELINESIZE
48 #error "Must know the size of a cache line"
49 #endif
50 static struct cache_info _cache_info = {
51 CACHELINESIZE,
52 CACHELINESIZE,
53 CACHELINESIZE,
54 CACHELINESIZE
55 };
56 #define CACHEINFO _cache_info
57 #elif defined(_KERNEL)
58 #define CACHEINFO (curcpu()->ci_ci)
59 #else
60 #include <stdlib.h>
61
62 size_t __getcachelinesize (void);
63
64 static int _cachelinesize = 0;
65
66 static struct cache_info _cache_info;
67 #define CACHEINFO _cache_info
68
69 size_t
__getcachelinesize(void)70 __getcachelinesize(void)
71 {
72 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
73 static int cacheinfomib[] = { CTL_MACHDEP, CPU_CACHEINFO };
74 size_t clen = sizeof(_cache_info);
75
76 if (_cachelinesize)
77 return _cachelinesize;
78
79 if (sysctl(cacheinfomib, sizeof(cacheinfomib) / sizeof(cacheinfomib[0]),
80 &_cache_info, &clen, NULL, 0) == 0) {
81 _cachelinesize = _cache_info.dcache_line_size;
82 return _cachelinesize;
83 }
84
85 /* Try older deprecated sysctl */
86 clen = sizeof(_cachelinesize);
87 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]),
88 &_cachelinesize, &clen, NULL, 0) < 0
89 || !_cachelinesize)
90 abort();
91
92 _cache_info.dcache_size = _cachelinesize;
93 _cache_info.dcache_line_size = _cachelinesize;
94 _cache_info.icache_size = _cachelinesize;
95 _cache_info.icache_line_size = _cachelinesize;
96
97 /* If there is no cache, indicate we have issued the sysctl. */
98 if (!_cachelinesize)
99 _cachelinesize = 1;
100
101 return _cachelinesize;
102 }
103 #endif
104
105 void
__syncicache(void * from,size_t len)106 __syncicache(void *from, size_t len)
107 {
108 size_t l, off;
109 size_t linesz;
110 char *p;
111
112 #if !defined(_KERNEL) && !defined(_STANDALONE)
113 if (!_cachelinesize)
114 __getcachelinesize();
115 #endif
116
117 if (CACHEINFO.dcache_size > 0) {
118 linesz = CACHEINFO.dcache_line_size;
119 off = (uintptr_t)from & (linesz - 1);
120 l = (len + off + linesz - 1) & ~(linesz - 1);
121 p = (char *)from - off;
122 do {
123 __asm volatile ("dcbst 0,%0" :: "r"(p));
124 p += linesz;
125 } while ((l -= linesz) != 0);
126 }
127 __asm volatile ("sync");
128
129 if (CACHEINFO.icache_size > 0 ) {
130 linesz = CACHEINFO.icache_line_size;
131 off = (uintptr_t)from & (linesz - 1);
132 l = (len + off + linesz - 1) & ~(linesz - 1);
133 p = (char *)from - off;
134 do {
135 __asm volatile ("icbi 0,%0" :: "r"(p));
136 p += linesz;
137 } while ((l -= linesz) != 0);
138 }
139 __asm volatile ("sync; isync");
140 }
141