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 static void getcachelinesize(void); 55 56 static int _cachelinesize; 57 #define CACHELINESIZE _cachelinesize 58 59 static void 60 getcachelinesize() 61 { 62 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE }; 63 int clen; 64 65 clen = sizeof(_cachelinesize); 66 67 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]), 68 &_cachelinesize, &clen, NULL, 0) < 0 || !_cachelinesize) { 69 abort(); 70 } 71 } 72 #endif 73 74 void 75 __syncicache(void *from, int len) 76 { 77 int l, off; 78 char *p; 79 80 #if !defined(_KERNEL) && !defined(_STANDALONE) 81 if (!_cachelinesize) 82 getcachelinesize(); 83 #endif 84 off = (u_int)from & (CACHELINESIZE - 1); 85 l = len += off; 86 p = (char *)from - off; 87 do { 88 __asm __volatile ("dcbst 0,%0" :: "r"(p)); 89 p += CACHELINESIZE; 90 } while ((l -= CACHELINESIZE) > 0); 91 __asm __volatile ("sync"); 92 p = (char *)from - off; 93 do { 94 __asm __volatile ("icbi 0,%0" :: "r"(p)); 95 p += CACHELINESIZE; 96 } while ((len -= CACHELINESIZE) > 0); 97 __asm __volatile ("sync; isync"); 98 } 99