syncicache.c revision 139825
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#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: head/sys/powerpc/powerpc/syncicache.c 139825 2005-01-07 02:29:27Z imp $"); 36 37#include <sys/param.h> 38#if defined(_KERNEL) || defined(_STANDALONE) 39#include <sys/time.h> 40#include <sys/proc.h> 41#include <vm/vm.h> 42#endif 43#include <sys/sysctl.h> 44 45#include <machine/cpu.h> 46 47#if defined(_KERNEL) || defined(_STANDALONE) 48#ifndef CACHELINESIZE 49#error "Must know the size of a cache line" 50#endif 51#else 52static void getcachelinesize(void); 53 54static int _cachelinesize; 55#define CACHELINESIZE _cachelinesize 56 57static void 58getcachelinesize() 59{ 60 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE }; 61 int clen; 62 63 clen = sizeof(_cachelinesize); 64 65 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]), 66 &_cachelinesize, &clen, NULL, 0) < 0 || !_cachelinesize) { 67 abort(); 68 } 69} 70#endif 71 72void 73__syncicache(void *from, int len) 74{ 75 int l, off; 76 char *p; 77 78#if !defined(_KERNEL) && !defined(_STANDALONE) 79 if (!_cachelinesize) 80 getcachelinesize(); 81#endif 82 off = (u_int)from & (CACHELINESIZE - 1); 83 l = len += off; 84 p = (char *)from - off; 85 do { 86 __asm __volatile ("dcbst 0,%0" :: "r"(p)); 87 p += CACHELINESIZE; 88 } while ((l -= CACHELINESIZE) > 0); 89 __asm __volatile ("sync"); 90 p = (char *)from - off; 91 do { 92 __asm __volatile ("icbi 0,%0" :: "r"(p)); 93 p += CACHELINESIZE; 94 } while ((len -= CACHELINESIZE) > 0); 95 __asm __volatile ("sync; isync"); 96} 97