1 /*        $NetBSD: syncicache.c,v 1.14 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 static void getcachelinesize (void);
61 
62 static int _cachelinesize = 0;
63 
64 static struct cache_info _cache_info;
65 #define CACHEINFO   _cache_info
66 
67 static void
getcachelinesize(void)68 getcachelinesize(void)
69 {
70           static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
71           static int cacheinfomib[] = { CTL_MACHDEP, CPU_CACHEINFO };
72           size_t clen = sizeof(_cache_info);
73 
74           if (sysctl(cacheinfomib, sizeof(cacheinfomib) / sizeof(cacheinfomib[0]),
75                     &_cache_info, &clen, NULL, 0) == 0) {
76                     _cachelinesize = _cache_info.dcache_line_size;
77                     return;
78           }
79 
80           /* Try older deprecated sysctl */
81           clen = sizeof(_cachelinesize);
82           if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]),
83                        &_cachelinesize, &clen, NULL, 0) < 0
84               || !_cachelinesize)
85                     abort();
86 
87           _cache_info.dcache_size = _cachelinesize;
88           _cache_info.dcache_line_size = _cachelinesize;
89           _cache_info.icache_size = _cachelinesize;
90           _cache_info.icache_line_size = _cachelinesize;
91           /* If there is no cache, indicate we have issued the sysctl. */
92           if (!_cachelinesize)
93                     _cachelinesize = 1;
94 }
95 #endif
96 
97 void
__syncicache(void * from,size_t len)98 __syncicache(void *from, size_t len)
99 {
100           size_t l, off;
101           size_t linesz;
102           char *p;
103 
104 #if       !defined(_KERNEL) && !defined(_STANDALONE)
105           if (!_cachelinesize)
106                     getcachelinesize();
107 #endif
108 
109           if (CACHEINFO.dcache_size > 0) {
110                     linesz = CACHEINFO.dcache_line_size;
111                     off = (uintptr_t)from & (linesz - 1);
112                     l = (len + off + linesz - 1) & ~(linesz - 1);
113                     p = (char *)from - off;
114                     do {
115                               __asm volatile ("dcbst 0,%0" :: "r"(p));
116                               p += linesz;
117                     } while ((l -= linesz) != 0);
118           }
119           __asm volatile ("sync");
120 
121           if (CACHEINFO.icache_size > 0 ) {
122                     linesz = CACHEINFO.icache_line_size;
123                     off = (uintptr_t)from & (linesz - 1);
124                     l = (len + off + linesz - 1) & ~(linesz - 1);
125                     p = (char *)from - off;
126                     do {
127                               __asm volatile ("icbi 0,%0" :: "r"(p));
128                               p += linesz;
129                     } while ((l -= linesz) != 0);
130           }
131           __asm volatile ("sync; isync");
132 }
133