sys_machdep.c revision 1.14 
1/*	$OpenBSD: sys_machdep.c,v 1.14 2013/06/02 16:38:05 guenther 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/ioctl.h>
36#include <sys/file.h>
37#include <sys/time.h>
38#include <sys/proc.h>
39#include <sys/user.h>
40#include <sys/uio.h>
41#include <sys/kernel.h>
42#include <sys/buf.h>
43#include <sys/signal.h>
44
45#include <sys/mount.h>
46#include <sys/syscallargs.h>
47
48#include <uvm/uvm_extern.h>
49
50#include <machine/cpu.h>
51#include <machine/cpufunc.h>
52#include <machine/psl.h>
53#include <machine/reg.h>
54#include <machine/sysarch.h>
55
56#if defined(PERFCTRS) && 0
57#include <machine/pmc.h>
58#endif
59
60extern struct vm_map *kernel_map;
61
62int amd64_iopl(struct proc *, void *, register_t *);
63
64#ifdef APERTURE
65extern int allowaperture;
66#endif
67
68int
69amd64_iopl(struct proc *p, void *args, register_t *retval)
70{
71	int error;
72	struct trapframe *tf = p->p_md.md_regs;
73	struct amd64_iopl_args ua;
74
75	if ((error = suser(p, 0)) != 0)
76		return error;
77
78#ifdef APERTURE
79	if (!allowaperture && securelevel > 0)
80		return EPERM;
81#else
82	if (securelevel > 0)
83		return EPERM;
84#endif
85
86	if ((error = copyin(args, &ua, sizeof(ua))) != 0)
87		return error;
88
89	if (ua.iopl)
90		tf->tf_rflags |= PSL_IOPL;
91	else
92		tf->tf_rflags &= ~PSL_IOPL;
93
94	return 0;
95}
96
97int
98amd64_get_fsbase(struct proc *p, void *args)
99{
100	return copyout(&p->p_addr->u_pcb.pcb_fsbase, args,
101	    sizeof(p->p_addr->u_pcb.pcb_fsbase));
102}
103
104int
105amd64_set_fsbase(struct proc *p, void *args)
106{
107	int error;
108	uint64_t base;
109
110	if ((error = copyin(args, &base, sizeof(base))) != 0)
111		return (error);
112
113	if (base >= VM_MAXUSER_ADDRESS)
114		return (EINVAL);
115
116	p->p_addr->u_pcb.pcb_fsbase = base;
117	return 0;
118}
119
120int
121sys_sysarch(struct proc *p, void *v, register_t *retval)
122{
123	struct sys_sysarch_args /* {
124		syscallarg(int) op;
125		syscallarg(void *) parms;
126	} */ *uap = v;
127	int error = 0;
128
129	switch(SCARG(uap, op)) {
130	case AMD64_IOPL:
131		error = amd64_iopl(p, SCARG(uap, parms), retval);
132		break;
133
134#if defined(PERFCTRS) && 0
135	case AMD64_PMC_INFO:
136		error = pmc_info(p, SCARG(uap, parms), retval);
137		break;
138
139	case AMD64_PMC_STARTSTOP:
140		error = pmc_startstop(p, SCARG(uap, parms), retval);
141		break;
142
143	case AMD64_PMC_READ:
144		error = pmc_read(p, SCARG(uap, parms), retval);
145		break;
146#endif
147
148	case AMD64_GET_FSBASE:
149		error = amd64_get_fsbase(p, SCARG(uap, parms));
150		break;
151
152	case AMD64_SET_FSBASE:
153		error = amd64_set_fsbase(p, SCARG(uap, parms));
154		break;
155
156	default:
157		error = EINVAL;
158		break;
159	}
160	return (error);
161}
162