uaccess.h revision 1.2 
1/*	$NetBSD: uaccess.h,v 1.2 2014/03/18 18:20:42 riastradh Exp $	*/
2
3/*-
4 * Copyright (c) 2013 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Taylor R. Campbell.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef _ASM_UACCESS_H_
33#define _ASM_UACCESS_H_
34
35#include <sys/types.h>
36#include <sys/systm.h>
37
38/* XXX This is a cop-out.  */
39#define	VERIFY_READ	0
40#define	VERIFY_WRITE	1
41static inline bool
42access_ok(int verify_op __unused, const void *uaddr __unused,
43    size_t nbytes __unused)
44{
45	return true;
46}
47
48#define	__copy_from_user	copy_from_user
49#define	__copy_to_user		copy_to_user
50
51static inline int
52copy_from_user(void *kernel_addr, const void *user_addr, size_t len)
53{
54	/* XXX errno NetBSD->Linux */
55	return -copyin(user_addr, kernel_addr, len);
56}
57
58static inline int
59copy_to_user(void *user_addr, const void *kernel_addr, size_t len)
60{
61	/* XXX errno NetBSD->Linux */
62	return -copyout(kernel_addr, user_addr, len);
63}
64
65#define	get_user(KERNEL_LOC, USER_ADDR)					\
66	copy_from_user(&(KERNEL_LOC), (USER_ADDR), sizeof(KERNEL_LOC))
67
68#define	put_user(KERNEL_LOC, USER_ADDR)					\
69	copy_to_user((USER_ADDR), &(KERNEL_LOC), sizeof(KERNEL_LOC))
70
71#if 0
72/*
73 * XXX These `inatomic' versions are a cop out, but they should do for
74 * now -- they are used only in fast paths which can't fault but which
75 * can fall back to slower paths that arrange things so faulting is OK.
76 */
77
78static inline int
79__copy_from_user_inatomic(void *kernel_addr __unused,
80    const void *user_addr __unused, size_t len __unused)
81{
82	return -EFAULT;
83}
84
85static inline int
86__copy_to_user_inatomic(void *user_addr __unused,
87    const void *kernel_addr __unused, size_t len __unused)
88{
89	return -EFAULT;
90}
91#endif	/* 0 */
92
93static inline int
94__copy_from_user_inatomic_nocache(void *kernel_addr __unused,
95    const void *user_addr __unused, size_t len __unused)
96{
97	return -EFAULT;
98}
99
100#endif  /* _ASM_UACCESS_H_ */
101