sys_machdep.c revision 236991 
1/*-
2 * Copyright (c) 1990 The Regents of the University of California.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 *	from: @(#)sys_machdep.c	5.5 (Berkeley) 1/19/91
34 */
35
36#include <sys/cdefs.h>
37__FBSDID("$FreeBSD: head/sys/arm/arm/sys_machdep.c 236991 2012-06-13 04:59:55Z imp $");
38
39#include "opt_capsicum.h"
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/capability.h>
44#include <sys/proc.h>
45#include <sys/sysproto.h>
46#include <sys/syscall.h>
47#include <sys/sysent.h>
48
49#include <machine/sysarch.h>
50
51#ifndef _SYS_SYSPROTO_H_
52struct sysarch_args {
53	int op;
54	char *parms;
55};
56#endif
57
58/* Prototypes */
59static int arm32_sync_icache (struct thread *, void *);
60static int arm32_drain_writebuf(struct thread *, void *);
61
62static int
63arm32_sync_icache(struct thread *td, void *args)
64{
65	struct arm_sync_icache_args ua;
66	int error;
67
68	if ((error = copyin(args, &ua, sizeof(ua))) != 0)
69		return (error);
70
71	cpu_icache_sync_range(ua.addr, ua.len);
72
73	td->td_retval[0] = 0;
74	return (0);
75}
76
77static int
78arm32_drain_writebuf(struct thread *td, void *args)
79{
80	/* No args. */
81
82	td->td_retval[0] = 0;
83	cpu_drain_writebuf();
84	return (0);
85}
86
87static int
88arm32_set_tp(struct thread *td, void *args)
89{
90
91	td->td_md.md_tp = (register_t)args;
92	return (0);
93}
94
95static int
96arm32_get_tp(struct thread *td, void *args)
97{
98
99	td->td_retval[0] = td->td_md.md_tp;
100	return (0);
101}
102
103int
104sysarch(td, uap)
105	struct thread *td;
106	register struct sysarch_args *uap;
107{
108	int error;
109
110#ifdef CAPABILITY_MODE
111	/*
112	 * When adding new operations, add a new case statement here to
113	 * explicitly indicate whether or not the operation is safe to
114	 * perform in capability mode.
115	 */
116	if (IN_CAPABILITY_MODE(td)) {
117		switch (uap->op) {
118		case ARM_SYNC_ICACHE:
119		case ARM_DRAIN_WRITEBUF:
120		case ARM_SET_TP:
121		case ARM_GET_TP:
122			break;
123
124		default:
125#ifdef KTRACE
126			if (KTRPOINT(td, KTR_CAPFAIL))
127				ktrcapfail(CAPFAIL_SYSCALL, 0, 0);
128#endif
129			return (ECAPMODE);
130		}
131	}
132#endif
133
134	switch (uap->op) {
135	case ARM_SYNC_ICACHE:
136		error = arm32_sync_icache(td, uap->parms);
137		break;
138	case ARM_DRAIN_WRITEBUF:
139		error = arm32_drain_writebuf(td, uap->parms);
140		break;
141	case ARM_SET_TP:
142		error = arm32_set_tp(td, uap->parms);
143		break;
144	case ARM_GET_TP:
145		error = arm32_get_tp(td, uap->parms);
146		break;
147	default:
148		error = EINVAL;
149		break;
150	}
151	return (error);
152}
153