The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/initcpu.c

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    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  Unpublished rights reserved under the copyright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 
   30 #include <sys/cdefs.h>
   31 __FBSDID("$FreeBSD$");
   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   amd_pminfo;             /* AMD advanced power management info */
   57 u_int   cpu_high;               /* Highest arg to CPUID */
   58 u_int   cpu_exthigh;            /* Highest arg to extended CPUID */
   59 u_int   cpu_id;                 /* Stepping ID */
   60 u_int   cpu_procinfo;           /* HyperThreading Info / Brand Index / CLFUSH */
   61 u_int   cpu_procinfo2;          /* Multicore info */
   62 char    cpu_vendor[20];         /* CPU Origin code */
   63 u_int   cpu_fxsr;               /* SSE enabled */
   64 u_int   cpu_mxcsr_mask;         /* Valid bits in mxcsr */
   65 
   66 /*
   67  * Initialize CPU control registers
   68  */
   69 void
   70 initializecpu(void)
   71 {
   72         uint64_t msr;
   73 
   74         if ((cpu_feature & CPUID_XMM) && (cpu_feature & CPUID_FXSR)) {
   75                 load_cr4(rcr4() | CR4_FXSR | CR4_XMM);
   76                 cpu_fxsr = hw_instruction_sse = 1;
   77         }
   78         if ((amd_feature & AMDID_NX) != 0) {
   79                 msr = rdmsr(MSR_EFER) | EFER_NXE;
   80                 wrmsr(MSR_EFER, msr);
   81                 pg_nx = PG_NX;
   82         }
   83 }

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