133 lines
4 KiB
C
133 lines
4 KiB
C
/* $NetBSD: syncicache.c,v 1.14 2008/03/18 20:11:43 he Exp $ */
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/*
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* Copyright (C) 1995-1997, 1999 Wolfgang Solfrank.
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* Copyright (C) 1995-1997, 1999 TooLs GmbH.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#if defined(_KERNEL)
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#include <sys/time.h>
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#include <sys/proc.h>
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#include <uvm/uvm_extern.h>
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#endif
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#if !defined(_STANDALONE)
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#include <sys/sysctl.h>
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#endif
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#include <machine/cpu.h>
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#if defined(_STANDALONE)
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#ifndef CACHELINESIZE
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#error "Must know the size of a cache line"
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#endif
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static struct cache_info _cache_info = {
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CACHELINESIZE,
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CACHELINESIZE,
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CACHELINESIZE,
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CACHELINESIZE
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};
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#define CACHEINFO _cache_info
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#elif defined(_KERNEL)
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#define CACHEINFO (curcpu()->ci_ci)
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#else
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static void getcachelinesize (void);
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static int _cachelinesize = 0;
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static struct cache_info _cache_info;
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#define CACHEINFO _cache_info
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static void
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getcachelinesize(void)
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{
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static int cachemib[] = { CTL_MACHDEP, CPU_CACHELINE };
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static int cacheinfomib[] = { CTL_MACHDEP, CPU_CACHEINFO };
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size_t clen = sizeof(_cache_info);
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if (sysctl(cacheinfomib, sizeof(cacheinfomib) / sizeof(cacheinfomib[0]),
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&_cache_info, &clen, NULL, 0) == 0) {
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_cachelinesize = _cache_info.dcache_line_size;
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return;
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}
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/* Try older deprecated sysctl */
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clen = sizeof(_cachelinesize);
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if (sysctl(cachemib, sizeof(cachemib) / sizeof(cachemib[0]),
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&_cachelinesize, &clen, NULL, 0) < 0
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|| !_cachelinesize)
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abort();
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_cache_info.dcache_size = _cachelinesize;
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_cache_info.dcache_line_size = _cachelinesize;
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_cache_info.icache_size = _cachelinesize;
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_cache_info.icache_line_size = _cachelinesize;
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/* If there is no cache, indicate we have issued the sysctl. */
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if (!_cachelinesize)
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_cachelinesize = 1;
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}
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#endif
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void
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__syncicache(void *from, size_t len)
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{
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size_t l, off;
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size_t linesz;
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char *p;
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#if !defined(_KERNEL) && !defined(_STANDALONE)
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if (!_cachelinesize)
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getcachelinesize();
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#endif
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if (CACHEINFO.dcache_size > 0) {
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linesz = CACHEINFO.dcache_line_size;
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off = (uintptr_t)from & (linesz - 1);
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l = (len + off + linesz - 1) & ~(linesz - 1);
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p = (char *)from - off;
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do {
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__asm volatile ("dcbst 0,%0" :: "r"(p));
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p += linesz;
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} while ((l -= linesz) != 0);
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}
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__asm volatile ("sync");
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if (CACHEINFO.icache_size > 0 ) {
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linesz = CACHEINFO.icache_line_size;
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off = (uintptr_t)from & (linesz - 1);
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l = (len + off + linesz - 1) & ~(linesz - 1);
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p = (char *)from - off;
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do {
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__asm volatile ("icbi 0,%0" :: "r"(p));
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p += linesz;
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} while ((l -= linesz) != 0);
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}
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__asm volatile ("sync; isync");
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}
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