sys/amd64/amd64/sys_machdep.c

   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 }