1 /* $NetBSD: syncicache.c,v 1.2 2012/11/24 07:16:04 christos 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) || defined(_STANDALONE) 35 #include <sys/time.h> 36 #include <sys/proc.h> 37 #include <uvm/uvm_extern.h> 38 #endif 39 #include <sys/sysctl.h> 40 41 #include <machine/cpu.h> 42 43 44 #if defined(_STANDALONE) 45 #ifndef CACHELINESIZE 46 #error "Must know the size of a cache line" 47 #endif 48 static struct cache_info _cache_info = { 49 CACHELINESIZE, 50 CACHELINESIZE, 51 CACHELINESIZE, 52 CACHELINESIZE 53 }; 54 #define CACHEINFO _cache_info 55 #elif defined(_KERNEL) 56 #define CACHEINFO (curcpu()->ci_ci) 57 #else 58 #include <stdlib.h> 59 60 size_t __getcachelinesize (void); 61 62 static int _cachelinesize = 0; 63 64 static struct cache_info _cache_info; 65 #define CACHEINFO _cache_info 66 67 size_t 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 (_cachelinesize) 75 return _cachelinesize; 76 77 if (sysctl(cacheinfomib, (u_int)__arraycount(cacheinfomib), 78 &_cache_info, &clen, NULL, 0) == 0) { 79 _cachelinesize = _cache_info.dcache_line_size; 80 return _cachelinesize; 81 } 82 83 /* Try older deprecated sysctl */ 84 clen = sizeof(_cachelinesize); 85 if (sysctl(cachemib, (u_int)__arraycount(cachemib), 86 &_cachelinesize, &clen, NULL, 0) < 0 || !_cachelinesize) 87 abort(); 88 89 _cache_info.dcache_size = _cachelinesize; 90 _cache_info.dcache_line_size = _cachelinesize; 91 _cache_info.icache_size = _cachelinesize; 92 _cache_info.icache_line_size = _cachelinesize; 93 94 /* If there is no cache, indicate we have issued the sysctl. */ 95 if (!_cachelinesize) 96 _cachelinesize = 1; 97 98 return _cachelinesize; 99 } 100 #endif 101 102 void 103 __syncicache(void *from, size_t len) 104 { 105 size_t l, off; 106 size_t linesz; 107 char *p; 108 109 #if !defined(_KERNEL) && !defined(_STANDALONE) 110 if (!_cachelinesize) 111 __getcachelinesize(); 112 #endif 113 114 if (CACHEINFO.dcache_size > 0) { 115 linesz = CACHEINFO.dcache_line_size; 116 off = (uintptr_t)from & (linesz - 1); 117 l = (len + off + linesz - 1) & ~(linesz - 1); 118 p = (char *)from - off; 119 do { 120 __asm volatile ("dcbst 0,%0" :: "r"(p)); 121 p += linesz; 122 } while ((l -= linesz) != 0); 123 } 124 __asm volatile ("sync"); 125 126 if (CACHEINFO.icache_size > 0 ) { 127 linesz = CACHEINFO.icache_line_size; 128 off = (uintptr_t)from & (linesz - 1); 129 l = (len + off + linesz - 1) & ~(linesz - 1); 130 p = (char *)from - off; 131 do { 132 __asm volatile ("icbi 0,%0" :: "r"(p)); 133 p += linesz; 134 } while ((l -= linesz) != 0); 135 } 136 __asm volatile ("sync; isync"); 137 } 138