1 /* $NetBSD: syncicache.c,v 1.13 2005/12/24 23:29:06 perry 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 static void getcachelinesize (void); 59 60 static int _cachelinesize = 0; 61 62 static struct cache_info _cache_info; 63 #define CACHEINFO _cache_info 64 65 static void 66 getcachelinesize(void) 67 { 68 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE }; 69 static int cacheinfomib[] = { CTL_MACHDEP, CPU_CACHEINFO }; 70 size_t clen = sizeof(_cache_info); 71 72 if (sysctl(cacheinfomib, sizeof(cacheinfomib) / sizeof(cacheinfomib[0]), 73 &_cache_info, &clen, NULL, 0) == 0) { 74 _cachelinesize = _cache_info.dcache_line_size; 75 return; 76 } 77 78 /* Try older deprecated sysctl */ 79 clen = sizeof(_cachelinesize); 80 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]), 81 &_cachelinesize, &clen, NULL, 0) < 0 82 || !_cachelinesize) 83 abort(); 84 85 _cache_info.dcache_size = _cachelinesize; 86 _cache_info.dcache_line_size = _cachelinesize; 87 _cache_info.icache_size = _cachelinesize; 88 _cache_info.icache_line_size = _cachelinesize; 89 /* If there is no cache, indicate we have issued the sysctl. */ 90 if (!_cachelinesize) 91 _cachelinesize = 1; 92 } 93 #endif 94 95 void 96 __syncicache(void *from, size_t len) 97 { 98 size_t l, off; 99 size_t linesz; 100 char *p; 101 102 #if !defined(_KERNEL) && !defined(_STANDALONE) 103 if (!_cachelinesize) 104 getcachelinesize(); 105 #endif 106 107 if (CACHEINFO.dcache_size > 0) { 108 linesz = CACHEINFO.dcache_line_size; 109 off = (uintptr_t)from & (linesz - 1); 110 l = (len + off + linesz - 1) & ~(linesz - 1); 111 p = (char *)from - off; 112 do { 113 __asm volatile ("dcbst 0,%0" :: "r"(p)); 114 p += linesz; 115 } while ((l -= linesz) != 0); 116 } 117 __asm volatile ("sync"); 118 119 if (CACHEINFO.icache_size > 0 ) { 120 linesz = CACHEINFO.icache_line_size; 121 off = (uintptr_t)from & (linesz - 1); 122 l = (len + off + linesz - 1) & ~(linesz - 1); 123 p = (char *)from - off; 124 do { 125 __asm volatile ("icbi 0,%0" :: "r"(p)); 126 p += linesz; 127 } while ((l -= linesz) != 0); 128 } 129 __asm volatile ("sync; isync"); 130 } 131