1 /* $NetBSD: syncicache.c,v 1.1 1999/04/17 21:16:45 ws 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/proc.h> 36 #include <vm/vm.h> 37 #endif 38 #include <sys/sysctl.h> 39 40 #include <machine/cpu.h> 41 42 #if defined(_KERNEL) || defined(_STANDALONE) 43 #ifndef CACHELINESIZE 44 #error "Must know the size of a cache line" 45 #endif 46 #else 47 static int _cachelinesize; 48 #define CACHELINESIZE _cachelinesize 49 50 static void 51 getcachelinesize() 52 { 53 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE }; 54 int clen = sizeof(_cachelinesize); 55 56 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]), 57 &_cachelinesize, &clen, NULL, 0) < 0 58 || !_cachelinesize) 59 abort(); 60 } 61 #endif 62 63 void 64 __syncicache(from, len) 65 void *from; 66 int len; 67 { 68 int l, off; 69 char *p; 70 71 #if !defined(_KERNEL) && !defined(_STANDALONE) 72 if (!_cachelinesize) 73 getcachelinesize(); 74 #endif 75 off = (u_int)from & (CACHELINESIZE - 1); 76 l = len += off; 77 p = (char *)from - off; 78 do { 79 __asm__ __volatile ("dcbst 0,%0" :: "r"(p)); 80 p += CACHELINESIZE; 81 } while ((l -= CACHELINESIZE) > 0); 82 __asm__ __volatile ("sync"); 83 p = (char *)from - off; 84 do { 85 __asm__ __volatile ("icbi 0,%0" :: "r"(p)); 86 p += CACHELINESIZE; 87 } while ((len -= CACHELINESIZE) > 0); 88 __asm__ __volatile ("isync"); 89 } 90