1 /* $OpenBSD: mtrr.c,v 1.10 2007/05/02 18:52:17 matthieu Exp $ */
2 /*-
3 * Copyright (c) 1999 Michael Smith <msmith@freebsd.org>
4 * Copyright (c) 1999 Brian Fundakowski Feldman
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 */
29
30 #include <sys/param.h>
31 #include <sys/memrange.h>
32 #include <sys/systm.h>
33
34 #include <machine/specialreg.h>
35
36 extern struct mem_range_ops i686_mrops;
37 extern struct mem_range_ops k6_mrops;
38
39 void mtrrattach(int);
40
41 void
42 mtrrattach(int num)
43 {
44 int family, model, step;
45
46 if (num > 1)
47 return;
48
49 family = (cpu_id >> 8) & 0xf;
50 model = (cpu_id >> 4) & 0xf;
51 step = (cpu_id >> 0) & 0xf;
52
53 if (strcmp(cpu_vendor, "AuthenticAMD") == 0 &&
54 family == 0x5 &&
55 (model > 0x8 ||
56 (model == 0x8 &&
57 step > 0x7))) {
58 mem_range_softc.mr_op = &k6_mrops;
59
60 /* Try for i686 MTRRs */
61 } else if ((cpu_feature & CPUID_MTRR) &&
62 (family == 0x6 || family == 0xf) &&
63 ((strcmp(cpu_vendor, "GenuineIntel") == 0) ||
64 (strcmp(cpu_vendor, "AuthenticAMD") == 0))) {
65 mem_range_softc.mr_op = &i686_mrops;
66
67 }
68 /* Initialise memory range handling */
69 if (mem_range_softc.mr_op != NULL)
70 mem_range_softc.mr_op->init(&mem_range_softc);
71 }
72