2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
6 * Copyright (c) 2015 François Tigeot
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice unmodified, this list of conditions, and the following
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.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33 #ifndef _LINUX_UACCESS_H_
34 #define _LINUX_UACCESS_H_
36 #include <sys/param.h>
41 #include <vm/vm_extern.h>
43 #include <linux/compiler.h>
45 #define VERIFY_READ VM_PROT_READ
46 #define VERIFY_WRITE VM_PROT_WRITE
48 #define __get_user(_x, _p) ({ \
50 __typeof(*(_p)) __x; \
51 __err = linux_copyin((_p), &(__x), sizeof(*(_p))); \
56 #define __put_user(_x, _p) ({ \
57 __typeof(*(_p)) __x = (_x); \
58 linux_copyout(&(__x), (_p), sizeof(*(_p))); \
60 #define get_user(_x, _p) linux_copyin((_p), &(_x), sizeof(*(_p)))
61 #define put_user(_x, _p) linux_copyout(&(_x), (_p), sizeof(*(_p)))
62 #define clear_user(...) linux_clear_user(__VA_ARGS__)
63 #define access_ok(...) linux_access_ok(__VA_ARGS__)
65 extern int linux_copyin(const void *uaddr, void *kaddr, size_t len);
66 extern int linux_copyout(const void *kaddr, void *uaddr, size_t len);
67 extern size_t linux_clear_user(void *uaddr, size_t len);
68 extern int linux_access_ok(int rw, const void *uaddr, size_t len);
71 * NOTE: The returned value from pagefault_disable() must be stored
72 * and passed to pagefault_enable(). Else possible recursion on the
75 static inline int __must_check
76 pagefault_disable(void)
78 return (vm_fault_disable_pagefaults());
82 pagefault_enable(int save)
84 vm_fault_enable_pagefaults(save);
88 pagefault_disabled(void)
90 return ((curthread->td_pflags & TDP_NOFAULTING) != 0);
93 #endif /* _LINUX_UACCESS_H_ */