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syncicache.c revision 1.2.4.1 
      1 /*	$NetBSD: syncicache.c,v 1.2.4.1 2000/11/20 18:09:30 bouyer 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 __P((void));
     49 
     50 static int _cachelinesize;
     51 #define	CACHELINESIZE	_cachelinesize
     52 
     53 static void
     54 getcachelinesize()
     55 {
     56 	static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
     57 	int 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(from, len)
     68 	void *from;
     69 	int len;
     70 {
     71 	int l, off;
     72 	char *p;
     73 
     74 #if	!defined(_KERNEL) && !defined(_STANDALONE)
     75 	if (!_cachelinesize)
     76 		getcachelinesize();
     77 #endif
     78 	off = (u_int)from & (CACHELINESIZE - 1);
     79 	l = len += off;
     80 	p = (char *)from - off;
     81 	do {
     82 		__asm__ __volatile ("dcbst 0,%0" :: "r"(p));
     83 		p += CACHELINESIZE;
     84 	} while ((l -= CACHELINESIZE) > 0);
     85 	__asm__ __volatile ("sync");
     86 	p = (char *)from - off;
     87 	do {
     88 		__asm__ __volatile ("icbi 0,%0" :: "r"(p));
     89 		p += CACHELINESIZE;
     90 	} while ((len -= CACHELINESIZE) > 0);
     91 	__asm__ __volatile ("isync");
     92 }
     93