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/param.h> 35 #if defined(_KERNEL) || defined(_STANDALONE) 36 #include <sys/time.h> 37 #include <sys/proc.h> 38 #include <vm/vm.h> 39 #endif 40 #include <sys/sysctl.h> 41 42 #include <machine/cpu.h> 43 #include <machine/md_var.h> 44 45 #ifdef _STANDALONE 46 int cacheline_size = 32; 47 #endif 48 49 #if !defined(_KERNEL) && !defined(_STANDALONE) 50 #include <stdlib.h> 51 52 int cacheline_size = 0; 53 54 static void getcachelinesize(void); 55 56 static void 57 getcachelinesize(void) 58 { 59 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE }; 60 int clen; 61 62 clen = sizeof(cacheline_size); 63 64 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]), 65 &cacheline_size, &clen, NULL, 0) < 0 || !cacheline_size) { 66 abort(); 67 } 68 } 69 #endif 70 71 void 72 __syncicache(void *from, int len) 73 { 74 int l, off; 75 char *p; 76 77 #if !defined(_KERNEL) && !defined(_STANDALONE) 78 if (!cacheline_size) 79 getcachelinesize(); 80 #endif 81 82 off = (u_int)from & (cacheline_size - 1); 83 l = len += off; 84 p = (char *)from - off; 85 86 do { 87 __asm __volatile ("dcbst 0,%0" :: "r"(p)); 88 p += cacheline_size; 89 } while ((l -= cacheline_size) > 0); 90 __asm __volatile ("sync"); 91 p = (char *)from - off; 92 do { 93 __asm __volatile ("icbi 0,%0" :: "r"(p)); 94 p += cacheline_size; 95 } while ((len -= cacheline_size) > 0); 96 __asm __volatile ("sync; isync"); 97 } 98 99