1 /* $NetBSD: syncicache.c,v 1.5 2001/08/27 16:46:43 matt 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/time.h> 36 #include <sys/proc.h> 37 #include <uvm/uvm_extern.h> 38 #endif 39 #include <sys/sysctl.h> 40 41 #include <machine/cpu.h> 42 43 #if defined(_KERNEL) || defined(_STANDALONE) 44 #ifndef CACHELINESIZE 45 #error "Must know the size of a cache line" 46 #endif 47 #else 48 static void getcachelinesize (void); 49 50 static int _cachelinesize; 51 #define CACHELINESIZE _cachelinesize 52 53 static void 54 getcachelinesize(void) 55 { 56 static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE }; 57 size_t clen = sizeof(_cachelinesize); 58 59 if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]), 60 &_cachelinesize, &clen, NULL, 0) < 0 61 || !_cachelinesize) 62 abort(); 63 } 64 #endif 65 66 void 67 __syncicache(void *from, int len) 68 { 69 int l, off; 70 char *p; 71 72 #if !defined(_KERNEL) && !defined(_STANDALONE) 73 if (!_cachelinesize) 74 getcachelinesize(); 75 #endif 76 off = (u_int)from & (CACHELINESIZE - 1); 77 l = len += off; 78 p = (char *)from - off; 79 do { 80 __asm__ __volatile ("dcbst 0,%0" :: "r"(p)); 81 p += CACHELINESIZE; 82 } while ((l -= CACHELINESIZE) > 0); 83 __asm__ __volatile ("sync"); 84 p = (char *)from - off; 85 do { 86 __asm__ __volatile ("icbi 0,%0" :: "r"(p)); 87 p += CACHELINESIZE; 88 } while ((len -= CACHELINESIZE) > 0); 89 __asm__ __volatile ("isync"); 90 } 91