1/* $NetBSD: syncicache.c,v 1.14 2005/12/24 23:10:08 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) 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 50static 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 62size_t __getcachelinesize (void); 63 64static int _cachelinesize = 0; 65 66static struct cache_info _cache_info; 67#define CACHEINFO _cache_info 68 69size_t 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 105void 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