1 /* 2 * Copyright (C) 1995-1997, 1999 Wolfgang Solfrank. 3 * Copyright (C) 1995-1997, 1999 TooLs GmbH. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by TooLs GmbH. 17 * 4. The name of TooLs GmbH may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * $NetBSD: syncicache.c,v 1.2 1999/05/05 12:36:40 tsubai Exp $ 32 */ 33 34 #ifndef lint 35 static const char rcsid[] = 36 "$FreeBSD$"; 37 #endif /* not lint */ 38 39 #include <sys/param.h> 40 #if defined(_KERNEL) || defined(_STANDALONE) 41 #include <sys/time.h> 42 #include <sys/proc.h> 43 #include <vm/vm.h> 44 #endif 45 #include <sys/sysctl.h> 46 47 #include <machine/cpu.h> 48 49 #if defined(_KERNEL) || defined(_STANDALONE) 50 #ifndef CACHELINESIZE 51 #error "Must know the size of a cache line" 52 #endif 53 #else 54 #include <stdlib.h> 55 56 static void getcachelinesize(void); 57 58 static int _cachelinesize; 59 #define CACHELINESIZE _cachelinesize 60 61 static void 62 getcachelinesize() 63 { 64 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE }; 65 int clen; 66 67 clen = sizeof(_cachelinesize); 68 69 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]), 70 &_cachelinesize, &clen, NULL, 0) < 0 || !_cachelinesize) { 71 abort(); 72 } 73 } 74 #endif 75 76 void 77 __syncicache(void *from, int len) 78 { 79 int l, off; 80 char *p; 81 82 #if !defined(_KERNEL) && !defined(_STANDALONE) 83 if (!_cachelinesize) 84 getcachelinesize(); 85 #endif 86 off = (u_int)from & (CACHELINESIZE - 1); 87 l = len += off; 88 p = (char *)from - off; 89 do { 90 __asm __volatile ("dcbst 0,%0" :: "r"(p)); 91 p += CACHELINESIZE; 92 } while ((l -= CACHELINESIZE) > 0); 93 __asm __volatile ("sync"); 94 p = (char *)from - off; 95 do { 96 __asm __volatile ("icbi 0,%0" :: "r"(p)); 97 p += CACHELINESIZE; 98 } while ((len -= CACHELINESIZE) > 0); 99 __asm __volatile ("sync; isync"); 100 } 101