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
50static 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
60static void getcachelinesize (void);
61
62static int _cachelinesize = 0;
63
64static struct cache_info _cache_info;
65#define CACHEINFO	_cache_info
66
67static void
68getcachelinesize(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
97void
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}
133