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: src/sys/amd64/amd64/sys_machdep.c,v 1.90 2005/07/10 23:31:10 davidxu Exp $");
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 }
135 Cache object: 54cbc706f0bf39e404603dbffe60f70b
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