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 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 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