sys/platform/pc64/amd64/initcpu.c

   1 /*-
   2  * Copyright (c) KATO Takenori, 1997, 1998.
   3  *
   4  * All rights reserved.  Unpublished rights reserved under the copyright
   5  * laws of Japan.
   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  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer as
  13  *    the first lines of this file unmodified.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/sys/amd64/amd64/initcpu.c,v 1.50 2006/06/19 22:59:28 davidxu Exp $
  30  *
  31  */
  32
  33 #include "opt_cpu.h"
  34
  35 #include <sys/param.h>
  36 #include <sys/kernel.h>
  37 #include <sys/systm.h>
  38 #include <sys/sysctl.h>
  39
  40 #include <machine/cputypes.h>
  41 #include <machine/md_var.h>
  42 #include <machine/specialreg.h>
  43
  44 #include <vm/vm.h>
  45 #include <vm/pmap.h>
  46
  47 static int      hw_instruction_sse;
  48 SYSCTL_INT(_hw, OID_AUTO, instruction_sse, CTLFLAG_RD,
  49     &hw_instruction_sse, 0, "SIMD/MMX2 instructions available in CPU");
  50
  51 int     cpu;                    /* Are we 386, 386sx, 486, etc? */
  52 u_int   cpu_feature;            /* Feature flags */
  53 u_int   cpu_feature2;           /* Feature flags */
  54 u_int   amd_feature;            /* AMD feature flags */
  55 u_int   amd_feature2;           /* AMD feature flags */
  56 u_int   cpu_high;               /* Highest arg to CPUID */
  57 u_int   cpu_exthigh;            /* Highest arg to extended CPUID */
  58 u_int   cpu_id;                 /* Stepping ID */
  59 u_int   cpu_procinfo;           /* HyperThreading Info / Brand Index / CLFUSH */
  60 u_int   cpu_procinfo2;          /* Multicore info */
  61 char    cpu_vendor[20];         /* CPU Origin code */
  62 u_int   cpu_fxsr;               /* SSE enabled */
  63 u_int   cpu_mxcsr_mask;         /* Valid bits in mxcsr */
  64
  65 /*
  66  * Initialize CPU control registers
  67  */
  68 void
  69 initializecpu(void)
  70 {
  71         uint64_t msr;
  72
  73         if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) {
  74                 load_cr4(rcr4() | CR4_FXSR | CR4_XMM);
  75                 cpu_fxsr = hw_instruction_sse = 1;
  76         }
  77         if ((amd_feature & AMDID_NX) != 0) {
  78                 msr = rdmsr(MSR_EFER) | EFER_NXE;
  79                 wrmsr(MSR_EFER, msr);
  80                 #if 0
  81                         pg_nx = PG_NX;
  82                 #endif
  83         }
  84 }