FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/asm/uaccess.h

     /*-
      * Copyright (c) 2010 Isilon Systems, Inc.
      * Copyright (c) 2010 iX Systems, Inc.
      * Copyright (c) 2010 Panasas, Inc.
      * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    #ifndef _LINUXKPI_ASM_UACCESS_H_
    #define _LINUXKPI_ASM_UACCESS_H_
    
    #include <linux/uaccess.h>
    
    static inline long
    copy_to_user(void *to, const void *from, unsigned long n)
    {
            if (linux_copyout(from, to, n) != 0)
                    return n;
            return 0;
    }
    #define __copy_to_user(...)     copy_to_user(__VA_ARGS__)
    
    static inline long
    copy_from_user(void *to, const void *from, unsigned long n)
    {
            if (linux_copyin(from, to, n) != 0)
                    return n;
            return 0;
    }
    #define __copy_from_user(...)   copy_from_user(__VA_ARGS__)
    #define __copy_in_user(...)     copy_from_user(__VA_ARGS__)
    
    #define user_access_begin(ptr, len) access_ok(ptr, len)
    #define user_access_end() do { } while (0)
    
    #define user_write_access_begin(ptr, len) access_ok(ptr, len)
    #define user_write_access_end() do { } while (0)
    
    #define unsafe_get_user(x, ptr, err) do { \
            if (unlikely(__get_user(x, ptr))) \
                    goto err; \
    } while (0)
    
    #define unsafe_put_user(x, ptr, err) do { \
            if (unlikely(__put_user(x, ptr))) \
                    goto err; \
    } while (0)
    
    #endif  /* _LINUXKPI_ASM_UACCESS_H_ */

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