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/sys_machdep.c

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    1 /*-
    2  * Copyright (c) 1990 The Regents of the University of California.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by the University of
   16  *      California, Berkeley and its contributors.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
   34  * $FreeBSD: releng/5.1/sys/amd64/amd64/sys_machdep.c 114928 2003-05-12 02:37:29Z peter $
   35  *
   36  */
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/lock.h>
   41 #include <sys/proc.h>
   42 #include <sys/sysproto.h>
   43 #include <machine/specialreg.h>
   44 #include <machine/sysarch.h>
   45 #include <machine/pcb.h>
   46 
   47 #ifndef _SYS_SYSPROTO_H_
   48 struct sysarch_args {
   49         int op;
   50         char *parms;
   51 };
   52 #endif
   53 
   54 int
   55 sysarch(td, uap)
   56         struct thread *td;
   57         register struct sysarch_args *uap;
   58 {
   59         int error = 0;
   60         struct pcb *pcb = curthread->td_pcb;
   61 
   62         switch(uap->op) {
   63         case AMD64_GET_FSBASE:
   64                 error = copyout(&pcb->pcb_fsbase, uap->parms, sizeof(pcb->pcb_fsbase));
   65                 break;
   66                 
   67         case AMD64_SET_FSBASE:
   68                 error = copyin(uap->parms, &pcb->pcb_fsbase, sizeof(pcb->pcb_fsbase));
   69                 if (!error)
   70                         wrmsr(MSR_FSBASE, pcb->pcb_fsbase);
   71                 break;
   72 
   73         case AMD64_GET_GSBASE:
   74                 error = copyout(&pcb->pcb_gsbase, uap->parms, sizeof(pcb->pcb_gsbase));
   75                 break;
   76 
   77         case AMD64_SET_GSBASE:
   78                 error = copyin(uap->parms, &pcb->pcb_gsbase, sizeof(pcb->pcb_gsbase));
   79                 if (!error)
   80                         wrmsr(MSR_KGSBASE, pcb->pcb_fsbase);
   81                 break;
   82 
   83         default:
   84                 error = EINVAL;
   85                 break;
   86         }
   87         return (error);
   88 }

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