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
43extern struct vm_map *kernel_map;
44
45int amd64_iopl(struct proc *, void *, register_t *);
46
47#ifdef APERTURE
48extern int allowaperture;
49#endif
50
51int
52amd64_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
80int
81sys_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