usr/src/boot/lib/libstand/powerpc/syncicache.c

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