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syncicache.c revision 1.1 
      1 /*	$NetBSD: syncicache.c,v 1.1 1999/04/17 21:16:47 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