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("$FreeBSD$");
   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 #include <vm/vm.h>
   46 #include <vm/pmap.h>
   47 #include <machine/vmparam.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         uint32_t i386base;
   64         uint64_t a64base;
   65 
   66         switch(uap->op) {
   67         case I386_GET_FSBASE:
   68                 i386base = pcb->pcb_fsbase;
   69                 error = copyout(&i386base, uap->parms, sizeof(i386base));
   70                 break;
   71         case I386_SET_FSBASE:
   72                 error = copyin(uap->parms, &i386base, sizeof(i386base));
   73                 if (!error) {
   74                         critical_enter();
   75                         wrmsr(MSR_FSBASE, i386base);
   76                         pcb->pcb_fsbase = i386base;
   77                         critical_exit();
   78                 }
   79                 break;
   80         case I386_GET_GSBASE:
   81                 i386base = pcb->pcb_gsbase;
   82                 error = copyout(&i386base, uap->parms, sizeof(i386base));
   83                 break;
   84         case I386_SET_GSBASE:
   85                 error = copyin(uap->parms, &i386base, sizeof(i386base));
   86                 if (!error) {
   87                         critical_enter();
   88                         wrmsr(MSR_KGSBASE, i386base);
   89                         pcb->pcb_gsbase = i386base;
   90                         critical_exit();
   91                 }
   92                 break;
   93         case AMD64_GET_FSBASE:
   94                 error = copyout(&pcb->pcb_fsbase, uap->parms, sizeof(pcb->pcb_fsbase));
   95                 break;
   96                 
   97         case AMD64_SET_FSBASE:
   98                 error = copyin(uap->parms, &a64base, sizeof(a64base));
   99                 if (!error) {
  100                         if (a64base < VM_MAXUSER_ADDRESS) {
  101                                 critical_enter();
  102                                 wrmsr(MSR_FSBASE, a64base);
  103                                 pcb->pcb_fsbase = a64base;
  104                                 critical_exit();
  105                         } else {
  106                                 error = EINVAL;
  107                         }
  108                 }
  109                 break;
  110 
  111         case AMD64_GET_GSBASE:
  112                 error = copyout(&pcb->pcb_gsbase, uap->parms, sizeof(pcb->pcb_gsbase));
  113                 break;
  114 
  115         case AMD64_SET_GSBASE:
  116                 error = copyin(uap->parms, &a64base, sizeof(a64base));
  117                 if (!error) {
  118                         if (a64base < VM_MAXUSER_ADDRESS) {
  119                                 critical_enter();
  120                                 wrmsr(MSR_KGSBASE, a64base);
  121                                 pcb->pcb_gsbase = a64base;
  122                                 critical_exit();
  123                         } else {
  124                                 error = EINVAL;
  125                         }
  126                 }
  127                 break;
  128 
  129         default:
  130                 error = EINVAL;
  131                 break;
  132         }
  133         return (error);
  134 }

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