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Annotation of sys/arch/i386/i386/mtrr.c, Revision 1.1.1.1

1.1       nbrk        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: