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 François Tigeot 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 #define put_user(_x, _p) -copyout(&(_x), (_p), sizeof(*(_p))) 34 35 static inline long 36 copy_to_user(void *to, const void *from, unsigned long n) 37 { 38 if (copyout(from, to, n) != 0) 39 return n; 40 return 0; 41 } 42 43 static inline long 44 copy_from_user(void *to, const void *from, unsigned long n) 45 { 46 if (copyin(from, to, n) != 0) 47 return n; 48 return 0; 49 } 50 51 static inline int 52 __copy_to_user(void *to, const void *from, unsigned len) 53 { 54 if (copyout(from, to, len)) 55 return len; 56 return 0; 57 } 58 59 static inline unsigned long 60 __copy_from_user(void *to, const void *from, unsigned len) 61 { 62 if (copyin(from, to, len)) 63 return len; 64 return 0; 65 } 66 67 static inline int 68 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size) 69 { 70 if (copyin_nofault(src, dst, size)) 71 return size; 72 return 0; 73 } 74 75 static inline int 76 __copy_to_user_inatomic(void __user *to, const void *from, unsigned n) 77 { 78 return (copyout_nofault(from, to, n) != 0 ? n : 0); 79 } 80 81 static inline unsigned long 82 __copy_from_user_inatomic_nocache(void *to, const void __user *from, 83 unsigned long n) 84 { 85 /* 86 * XXXKIB. Equivalent Linux function is implemented using 87 * MOVNTI for aligned moves. For unaligned head and tail, 88 * normal move is performed. As such, it is not incorrect, if 89 * only somewhat slower, to use normal copyin. All uses 90 * except shmem_pwrite_fast() have the destination mapped WC. 91 */ 92 return ((copyin_nofault(__DECONST(void *, from), to, n) != 0 ? n : 0)); 93 } 94 95 #endif /* _ASM_UACCESS_H_ */ 96