1 /* $OpenBSD: sys_machdep.c,v 1.20 2018/02/19 08:59:52 mpi Exp $ */
2 /* $NetBSD: sys_machdep.c,v 1.1 2003/04/26 18:39:32 fvdl Exp $ */
3
4 /*-
5 * Copyright (c) 1998 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Charles M. Hannum.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/proc.h>
36
37 #include <sys/mount.h>
38 #include <sys/syscallargs.h>
39
40 #include <machine/psl.h>
41 #include <machine/sysarch.h>
42
43 extern struct vm_map *kernel_map;
44
45 int amd64_iopl(struct proc *, void *, register_t *);
46
47 #ifdef APERTURE
48 extern int allowaperture;
49 #endif
50
51 int
amd64_iopl(struct proc * p,void * args,register_t * retval)52 amd64_iopl(struct proc *p, void *args, register_t *retval)
53 {
54 int error;
55 struct trapframe *tf = p->p_md.md_regs;
56 struct amd64_iopl_args ua;
57
58 if ((error = suser(p)) != 0)
59 return error;
60
61 #ifdef APERTURE
62 if (!allowaperture && securelevel > 0)
63 return EPERM;
64 #else
65 if (securelevel > 0)
66 return EPERM;
67 #endif
68
69 if ((error = copyin(args, &ua, sizeof(ua))) != 0)
70 return error;
71
72 if (ua.iopl)
73 tf->tf_rflags |= PSL_IOPL;
74 else
75 tf->tf_rflags &= ~PSL_IOPL;
76
77 return 0;
78 }
79
80 int
sys_sysarch(struct proc * p,void * v,register_t * retval)81 sys_sysarch(struct proc *p, void *v, register_t *retval)
82 {
83 struct sys_sysarch_args /* {
84 syscallarg(int) op;
85 syscallarg(void *) parms;
86 } */ *uap = v;
87 int error = 0;
88
89 switch(SCARG(uap, op)) {
90 case AMD64_IOPL:
91 error = amd64_iopl(p, SCARG(uap, parms), retval);
92 break;
93
94 default:
95 error = EINVAL;
96 break;
97 }
98 return (error);
99 }
100