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uaccess.h revision 1.2.6.2 
      1 /*	$NetBSD: uaccess.h,v 1.2.6.2 2014/05/22 11:40:55 yamt 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
     41 static inline bool
     42 access_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 
     51 static inline int
     52 copy_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 
     58 static inline int
     59 copy_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 
     78 static 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 
     85 static 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 
     93 static 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