1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice unmodified, this list of conditions, and the following
13 * disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29 #ifndef _ASM_UACCESS_H_
30 #define _ASM_UACCESS_H_
31
32 #define get_user(_x, _p) -copyin((_p), &(_x), sizeof(*(_p)))
33
34 static inline long
copy_to_user(void * to,const void * from,unsigned long n)35 copy_to_user(void *to, const void *from, unsigned long n)
36 {
37 if (copyout(from, to, n) != 0)
38 return n;
39 return 0;
40 }
41
42 static inline long
copy_from_user(void * to,const void * from,unsigned long n)43 copy_from_user(void *to, const void *from, unsigned long n)
44 {
45 if (copyin(from, to, n) != 0)
46 return n;
47 return 0;
48 }
49
50 static inline int
__copy_to_user(void * to,const void * from,unsigned len)51 __copy_to_user(void *to, const void *from, unsigned len)
52 {
53 if (copyout(from, to, len))
54 return len;
55 return 0;
56 }
57
58 static inline unsigned long
__copy_from_user(void * to,const void * from,unsigned len)59 __copy_from_user(void *to, const void *from, unsigned len)
60 {
61 if (copyin(from, to, len))
62 return len;
63 return 0;
64 }
65
66 static inline int
__copy_from_user_inatomic(void * dst,const void __user * src,unsigned size)67 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size)
68 {
69 if (copyin_nofault(src, dst, size))
70 return size;
71 return 0;
72 }
73
74 static inline int
__copy_to_user_inatomic(void __user * to,const void * from,unsigned n)75 __copy_to_user_inatomic(void __user *to, const void *from, unsigned n)
76 {
77 return (copyout_nofault(from, to, n) != 0 ? n : 0);
78 }
79
80 static inline unsigned long
__copy_from_user_inatomic_nocache(void * to,const void __user * from,unsigned long n)81 __copy_from_user_inatomic_nocache(void *to, const void __user *from,
82 unsigned long n)
83 {
84 /*
85 * XXXKIB. Equivalent Linux function is implemented using
86 * MOVNTI for aligned moves. For unaligned head and tail,
87 * normal move is performed. As such, it is not incorrect, if
88 * only somewhat slower, to use normal copyin. All uses
89 * except shmem_pwrite_fast() have the destination mapped WC.
90 */
91 return ((copyin_nofault(__DECONST(void *, from), to, n) != 0 ? n : 0));
92 }
93
94 #define __get_user(x, ptr) get_user((x), (ptr))
95
96 #define __put_user(value, uptr) \
97 ({ \
98 __typeof(*(uptr)) __tmpval = (value); \
99 __copy_to_user_inatomic((uptr), &__tmpval, sizeof(__tmpval)); \
100 })
101
102 #define put_user(_x, _p) __put_user(_x, _p)
103
104 #define unsafe_put_user(x, ptr, err) do { \
105 if (unlikely(__put_user(x, ptr))) \
106 goto err; \
107 } while (0)
108
109 #define user_access_begin()
110 #define user_access_end()
111
112 #endif /* _ASM_UACCESS_H_ */
113