sys/lib/libkern/arch/powerpc/syncicache.c

   1 /*      $NetBSD: syncicache.c,v 1.13 2005/12/24 23:29:06 perry 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)
  35 #include <sys/time.h>
  36 #include <sys/proc.h>
  37 #include <uvm/uvm_extern.h>
  38 #endif
  39 #if     !defined(_STANDALONE)
  40 #include <sys/sysctl.h>
  41 #endif
  42
  43 #include <machine/cpu.h>
  44
  45
  46 #if defined(_STANDALONE)
  47 #ifndef CACHELINESIZE
  48 #error "Must know the size of a cache line"
  49 #endif
  50 static struct cache_info _cache_info = {
  51         CACHELINESIZE,
  52         CACHELINESIZE,
  53         CACHELINESIZE,
  54         CACHELINESIZE
  55 };
  56 #define CACHEINFO       _cache_info
  57 #elif defined(_KERNEL)
  58 #define CACHEINFO       (curcpu()->ci_ci)
  59 #else
  60 static void getcachelinesize (void);
  61
  62 static int _cachelinesize = 0;
  63
  64 static struct cache_info _cache_info;
  65 #define CACHEINFO       _cache_info
  66
  67 static void
  68 getcachelinesize(void)
  69 {
  70         static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
  71         static int cacheinfomib[] = { CTL_MACHDEP, CPU_CACHEINFO };
  72         size_t clen = sizeof(_cache_info);
  73
  74         if (sysctl(cacheinfomib, sizeof(cacheinfomib) / sizeof(cacheinfomib[0]),
  75                 &_cache_info, &clen, NULL, 0) == 0) {
  76                 _cachelinesize = _cache_info.dcache_line_size;
  77                 return;
  78         }
  79
  80         /* Try older deprecated sysctl */
  81         clen = sizeof(_cachelinesize);
  82         if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]),
  83                    &_cachelinesize, &clen, NULL, 0) < 0
  84             || !_cachelinesize)
  85                 abort();
  86
  87         _cache_info.dcache_size = _cachelinesize;
  88         _cache_info.dcache_line_size = _cachelinesize;
  89         _cache_info.icache_size = _cachelinesize;
  90         _cache_info.icache_line_size = _cachelinesize;
  91         /* If there is no cache, indicate we have issued the sysctl. */
  92         if (!_cachelinesize)
  93                 _cachelinesize = 1;
  94 }
  95 #endif
  96
  97 void
  98 __syncicache(void *from, size_t len)
  99 {
 100         size_t l, off;
 101         size_t linesz;
 102         char *p;
 103
 104 #if     !defined(_KERNEL) && !defined(_STANDALONE)
 105         if (!_cachelinesize)
 106                 getcachelinesize();
 107 #endif
 108
 109         if (CACHEINFO.dcache_size > 0) {
 110                 linesz = CACHEINFO.dcache_line_size;
 111                 off = (uintptr_t)from & (linesz - 1);
 112                 l = (len + off + linesz - 1) & ~(linesz - 1);
 113                 p = (char *)from - off;
 114                 do {
 115                         __asm volatile ("dcbst 0,%0" :: "r"(p));
 116                         p += linesz;
 117                 } while ((l -= linesz) != 0);
 118         }
 119         __asm volatile ("sync");
 120
 121         if (CACHEINFO.icache_size > 0 ) {
 122                 linesz = CACHEINFO.icache_line_size;
 123                 off = (uintptr_t)from & (linesz - 1);
 124                 l = (len + off + linesz - 1) & ~(linesz - 1);
 125                 p = (char *)from - off;
 126                 do {
 127                         __asm volatile ("icbi 0,%0" :: "r"(p));
 128                         p += linesz;
 129                 } while ((l -= linesz) != 0);
 130         }
 131         __asm volatile ("sync; isync");
 132 }