text: /* $OpenBSD: mtrr.c,v 1.6 2002/03/14 01:26:32 millert Exp $ */
  /*-
   * Copyright (c) 1999 Michael Smith <msmith@freebsd.org>
   * Copyright (c) 1999 Brian Fundakowski Feldman
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   */
  
  #include <sys/param.h>
  #include <sys/memrange.h>
  #include <sys/systm.h>
  
  #include <machine/specialreg.h>
  
  /* Pull in the cpuid values from locore.s */
  extern int cpu_id;
  extern int cpu_feature;
  extern char cpu_vendor[];
  
  extern struct mem_range_ops i686_mrops;
  extern struct mem_range_ops k6_mrops;
  
  void mtrrattach(int);
  
  void
  mtrrattach (num)
  	int num;
  {
  	if (num > 1)
  		return;
  
  	if (strcmp(cpu_vendor, "AuthenticAMD") == 0 &&
  	    (cpu_id & 0xf00) == 0x500 &&
  	    ((cpu_id & 0xf0) > 0x80 ||
  	     ((cpu_id & 0xf0) == 0x80 &&
  	      (cpu_id & 0xf) > 0x7))) {
  		mem_range_softc.mr_op = &k6_mrops;
  		
  		/* Try for i686 MTRRs */
  	} else if ((cpu_feature & CPUID_MTRR) &&
  		   ((cpu_id & 0xf00) == 0x600) &&
  		   ((strcmp(cpu_vendor, "GenuineIntel") == 0) ||
  		    (strcmp(cpu_vendor, "AuthenticAMD") == 0))) {
  		mem_range_softc.mr_op = &i686_mrops;
  	    
  	} 
  	/* Initialise memory range handling */
  	if (mem_range_softc.mr_op != NULL)
  		mem_range_softc.mr_op->init(&mem_range_softc);
  }
  
  
  