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  * 3. All advertising materials mentioning features or use of this software
   15  *    must display the following acknowledgement:
   16  *      This product includes software developed by the University of
   17  *      California, Berkeley and its contributors.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      from: @(#)sys_machdep.c 5.5 (Berkeley) 1/19/91
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/5.2/sys/amd64/amd64/sys_machdep.c 122940 2003-11-21 03:02:00Z peter $");
   39 
   40 #include <sys/param.h>
   41 #include <sys/systm.h>
   42 #include <sys/lock.h>
   43 #include <sys/proc.h>
   44 #include <sys/sysproto.h>
   45 #include <machine/specialreg.h>
   46 #include <machine/sysarch.h>
   47 #include <machine/pcb.h>
   48 
   49 #ifndef _SYS_SYSPROTO_H_
   50 struct sysarch_args {
   51         int op;
   52         char *parms;
   53 };
   54 #endif
   55 
   56 int
   57 sysarch(td, uap)
   58         struct thread *td;
   59         register struct sysarch_args *uap;
   60 {
   61         int error = 0;
   62         struct pcb *pcb = curthread->td_pcb;
   63 
   64         switch(uap->op) {
   65         case AMD64_GET_FSBASE:
   66                 error = copyout(&pcb->pcb_fsbase, uap->parms, sizeof(pcb->pcb_fsbase));
   67                 break;
   68                 
   69         case AMD64_SET_FSBASE:
   70                 error = copyin(uap->parms, &pcb->pcb_fsbase, sizeof(pcb->pcb_fsbase));
   71                 if (!error)
   72                         wrmsr(MSR_FSBASE, pcb->pcb_fsbase);
   73                 break;
   74 
   75         case AMD64_GET_GSBASE:
   76                 error = copyout(&pcb->pcb_gsbase, uap->parms, sizeof(pcb->pcb_gsbase));
   77                 break;
   78 
   79         case AMD64_SET_GSBASE:
   80                 error = copyin(uap->parms, &pcb->pcb_gsbase, sizeof(pcb->pcb_gsbase));
   81                 if (!error)
   82                         wrmsr(MSR_KGSBASE, pcb->pcb_gsbase);
   83                 break;
   84 
   85         default:
   86                 error = EINVAL;
   87                 break;
   88         }
   89         return (error);
   90 }

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

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