1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2015-2020 François Tigeot <ftigeot@wolfpond.org> 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 34 static inline long 35 copy_to_user(void *to, const void *from, unsigned long n) 36 { 37 if (copyout(from, to, n) != 0) 38 return n; 39 return 0; 40 } 41 42 static inline long 43 copy_from_user(void *to, const void *from, unsigned long n) 44 { 45 if (copyin(from, to, n) != 0) 46 return n; 47 return 0; 48 } 49 50 static inline int 51 __copy_to_user(void *to, const void *from, unsigned len) 52 { 53 if (copyout(from, to, len)) 54 return len; 55 return 0; 56 } 57 58 static inline unsigned long 59 __copy_from_user(void *to, const void *from, unsigned len) 60 { 61 if (copyin(from, to, len)) 62 return len; 63 return 0; 64 } 65 66 static inline int 67 __copy_from_user_inatomic(void *dst, const void __user *src, unsigned size) 68 { 69 if (copyin_nofault(src, dst, size)) 70 return size; 71 return 0; 72 } 73 74 static inline int 75 __copy_to_user_inatomic(void __user *to, const void *from, unsigned n) 76 { 77 return (copyout_nofault(from, to, n) != 0 ? n : 0); 78 } 79 80 static inline unsigned long 81 __copy_from_user_inatomic_nocache(void *to, const void __user *from, 82 unsigned long n) 83 { 84 /* 85 * XXXKIB. Equivalent Linux function is implemented using 86 * MOVNTI for aligned moves. For unaligned head and tail, 87 * normal move is performed. As such, it is not incorrect, if 88 * only somewhat slower, to use normal copyin. All uses 89 * except shmem_pwrite_fast() have the destination mapped WC. 90 */ 91 return ((copyin_nofault(__DECONST(void *, from), to, n) != 0 ? n : 0)); 92 } 93 94 #define __get_user(x, ptr) get_user((x), (ptr)) 95 96 #define __put_user(value, uptr) \ 97 ({ \ 98 __typeof(*(uptr)) __tmpval = (value); \ 99 __copy_to_user_inatomic((uptr), &__tmpval, sizeof(__tmpval)); \ 100 }) 101 102 #define put_user(_x, _p) __put_user(_x, _p) 103 104 #define unsafe_put_user(x, ptr, err) do { \ 105 if (unlikely(__put_user(x, ptr))) \ 106 goto err; \ 107 } while (0) 108 109 #define user_access_begin() 110 #define user_access_end() 111 112 #endif /* _ASM_UACCESS_H_ */ 113