1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 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 * $NetBSD: syncicache.c,v 1.2 1999/05/05 12:36:40 tsubai Exp $ 34 */ 35 36 #ifndef lint 37 static const char rcsid[] = 38 "$FreeBSD$"; 39 #endif /* not lint */ 40 41 #include <sys/param.h> 42 #if defined(_KERNEL) || defined(_STANDALONE) 43 #include <sys/time.h> 44 #include <sys/proc.h> 45 #include <vm/vm.h> 46 #endif 47 #include <sys/sysctl.h> 48 49 #include <machine/cpu.h> 50 #include <machine/md_var.h> 51 52 #ifdef _STANDALONE 53 int cacheline_size = 32; 54 #endif 55 56 #if !defined(_KERNEL) && !defined(_STANDALONE) 57 #include <stdlib.h> 58 59 int cacheline_size = 0; 60 61 static void getcachelinesize(void); 62 63 static void 64 getcachelinesize() 65 { 66 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE }; 67 int clen; 68 69 clen = sizeof(cacheline_size); 70 71 if (sysctl(cachemib, nitems(cachemib), &cacheline_size, &clen, 72 NULL, 0) < 0 || !cacheline_size) { 73 abort(); 74 } 75 } 76 #endif 77 78 void 79 __syncicache(void *from, int len) 80 { 81 int l, off; 82 char *p; 83 84 #if !defined(_KERNEL) && !defined(_STANDALONE) 85 if (!cacheline_size) 86 getcachelinesize(); 87 #endif 88 89 off = (u_int)from & (cacheline_size - 1); 90 l = len += off; 91 p = (char *)from - off; 92 93 do { 94 __asm __volatile ("dcbst 0,%0" :: "r"(p)); 95 p += cacheline_size; 96 } while ((l -= cacheline_size) > 0); 97 __asm __volatile ("sync"); 98 p = (char *)from - off; 99 do { 100 __asm __volatile ("icbi 0,%0" :: "r"(p)); 101 p += cacheline_size; 102 } while ((len -= cacheline_size) > 0); 103 __asm __volatile ("sync; isync"); 104 } 105 106