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

     /*-
      * Copyright (c) 2010 Isilon Systems, Inc.
      * Copyright (c) 2010 iX Systems, Inc.
      * Copyright (c) 2010 Panasas, Inc.
      * Copyright (c) 2013-2016 Mellanox Technologies, Ltd.
      * Copyright (c) 2015 François Tigeot
      * 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_LINUX_UACCESS_H_
    #define _LINUXKPI_LINUX_UACCESS_H_
    
    #include <sys/param.h>
    #include <sys/lock.h>
    #include <sys/proc.h>
    
    #include <vm/vm.h>
    #include <vm/vm_extern.h>
    
    #include <linux/compiler.h>
    
    #define VERIFY_READ     VM_PROT_READ
    #define VERIFY_WRITE    VM_PROT_WRITE
    
    #define __get_user(_x, _p) ({                                   \
            int __err;                                              \
            __typeof(*(_p)) __x;                                    \
            __err = linux_copyin((_p), &(__x), sizeof(*(_p)));      \
            (_x) = __x;                                             \
            __err;                                                  \
    })
    
    #define __put_user(_x, _p) ({                           \
            __typeof(*(_p)) __x = (_x);                     \
            linux_copyout(&(__x), (_p), sizeof(*(_p)));     \
    })
    #define get_user(_x, _p)        linux_copyin((_p), &(_x), sizeof(*(_p)))
    #define put_user(_x, _p)        __put_user(_x, _p)
    #define clear_user(...)         linux_clear_user(__VA_ARGS__)
    
    #define access_ok(a,b)          linux_access_ok(a,b)
    
    extern int linux_copyin(const void *uaddr, void *kaddr, size_t len);
    extern int linux_copyout(const void *kaddr, void *uaddr, size_t len);
    extern size_t linux_clear_user(void *uaddr, size_t len);
    extern int linux_access_ok(const void *uaddr, size_t len);
    
    /*
     * NOTE: Each pagefault_disable() call must have a corresponding
     * pagefault_enable() call in the same scope. The former creates a new
     * block and defines a temporary variable, and the latter uses the
     * temporary variable and closes the block. Failure to balance the
     * calls will result in a compile-time error.
     */
    #define pagefault_disable(void) do {            \
            int __saved_pflags =                    \
                vm_fault_disable_pagefaults()
    
    #define pagefault_enable(void)                          \
            vm_fault_enable_pagefaults(__saved_pflags);     \
    } while (0)
    
    static inline bool
    pagefault_disabled(void)
    {
            return ((curthread->td_pflags & TDP_NOFAULTING) != 0);
    }
    
    static inline int
    __copy_to_user_inatomic(void __user *to, const void *from, unsigned n)
    {
    
            return (copyout_nofault(from, to, n) != 0 ? n : 0);
    }
    #define __copy_to_user_inatomic_nocache(to, from, n)    \
            __copy_to_user_inatomic((to), (from), (n))
   
   static inline unsigned long
   __copy_from_user_inatomic(void *to, const void __user *from,
       unsigned long n)
   {
           /*
            * XXXKIB.  Equivalent Linux function is implemented using
            * MOVNTI for aligned moves.  For unaligned head and tail,
            * normal move is performed.  As such, it is not incorrect, if
            * only somewhat slower, to use normal copyin.  All uses
            * except shmem_pwrite_fast() have the destination mapped WC.
            */
           return ((copyin_nofault(__DECONST(void *, from), to, n) != 0 ? n : 0));
   }
   #define __copy_from_user_inatomic_nocache(to, from, n)  \
           __copy_from_user_inatomic((to), (from), (n))
   
   #endif                                  /* _LINUXKPI_LINUX_UACCESS_H_ */

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