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) 2003 Peter Wemm.
    3  * Copyright (c) 1990 The Regents of the University of California.
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 4. Neither the name of the University nor the names of its contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  *      from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/5.3/sys/amd64/amd64/sys_machdep.c 127920 2004-04-05 23:55:14Z imp $");
   35 
   36 #include <sys/param.h>
   37 #include <sys/systm.h>
   38 #include <sys/lock.h>
   39 #include <sys/proc.h>
   40 #include <sys/sysproto.h>
   41 #include <machine/specialreg.h>
   42 #include <machine/sysarch.h>
   43 #include <machine/pcb.h>
   44 
   45 #ifndef _SYS_SYSPROTO_H_
   46 struct sysarch_args {
   47         int op;
   48         char *parms;
   49 };
   50 #endif
   51 
   52 int
   53 sysarch(td, uap)
   54         struct thread *td;
   55         register struct sysarch_args *uap;
   56 {
   57         int error = 0;
   58         struct pcb *pcb = curthread->td_pcb;
   59 
   60         switch(uap->op) {
   61         case AMD64_GET_FSBASE:
   62                 error = copyout(&pcb->pcb_fsbase, uap->parms, sizeof(pcb->pcb_fsbase));
   63                 break;
   64                 
   65         case AMD64_SET_FSBASE:
   66                 error = copyin(uap->parms, &pcb->pcb_fsbase, sizeof(pcb->pcb_fsbase));
   67                 if (!error)
   68                         wrmsr(MSR_FSBASE, pcb->pcb_fsbase);
   69                 break;
   70 
   71         case AMD64_GET_GSBASE:
   72                 error = copyout(&pcb->pcb_gsbase, uap->parms, sizeof(pcb->pcb_gsbase));
   73                 break;
   74 
   75         case AMD64_SET_GSBASE:
   76                 error = copyin(uap->parms, &pcb->pcb_gsbase, sizeof(pcb->pcb_gsbase));
   77                 if (!error)
   78                         wrmsr(MSR_KGSBASE, pcb->pcb_gsbase);
   79                 break;
   80 
   81         default:
   82                 error = EINVAL;
   83                 break;
   84         }
   85         return (error);
   86 }

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