File: | arch/amd64/amd64/mtrr.c |
Warning: | line 44, column 2 Value stored to 'model' is never read |
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1 | /* $OpenBSD: mtrr.c,v 1.4 2013/12/19 21:30:02 deraadt 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 mrops; |
37 | |
38 | void |
39 | mem_range_attach(void) |
40 | { |
41 | int family, model, step; |
42 | |
43 | family = (cpu_id >> 8) & 0xf; |
44 | model = (cpu_id >> 4) & 0xf; |
Value stored to 'model' is never read | |
45 | step = (cpu_id >> 0) & 0xf; |
46 | |
47 | /* Try for i686 MTRRs */ |
48 | if (((strcmp(cpu_vendor, "GenuineIntel") == 0) || |
49 | (strcmp(cpu_vendor, "CentaurHauls") == 0) || |
50 | (strcmp(cpu_vendor, "AuthenticAMD") == 0)) && |
51 | (family == 0x6 || family == 0xf) && |
52 | cpu_feature & CPUID_MTRR0x00001000) { |
53 | mem_range_softc.mr_op = &mrops; |
54 | } |
55 | |
56 | /* Initialise memory range handling */ |
57 | if (mem_range_softc.mr_op != NULL((void *)0)) |
58 | mem_range_softc.mr_op->init(&mem_range_softc); |
59 | } |
60 |