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 #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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