| 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 |