1 /*- 2 * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved. 3 * Copyright (c) 2014-2015 Mellanox Technologies, Ltd. All rights reserved. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #ifndef _LINUXKPI_LINUX_MATH64_H 31 #define _LINUXKPI_LINUX_MATH64_H 32 33 #include <sys/stdint.h> 34 35 #define do_div(n, base) ({ \ 36 uint32_t __base = (base); \ 37 uint32_t __rem; \ 38 __rem = ((uint64_t)(n)) % __base; \ 39 (n) = ((uint64_t)(n)) / __base; \ 40 __rem; \ 41 }) 42 43 static inline uint64_t 44 div64_u64_rem(uint64_t dividend, uint64_t divisor, uint64_t *remainder) 45 { 46 47 *remainder = dividend % divisor; 48 return (dividend / divisor); 49 } 50 51 static inline int64_t 52 div64_s64(int64_t dividend, int64_t divisor) 53 { 54 55 return (dividend / divisor); 56 } 57 58 static inline uint64_t 59 div64_u64(uint64_t dividend, uint64_t divisor) 60 { 61 62 return (dividend / divisor); 63 } 64 65 static inline uint64_t 66 div_u64_rem(uint64_t dividend, uint32_t divisor, uint32_t *remainder) 67 { 68 69 *remainder = dividend % divisor; 70 return (dividend / divisor); 71 } 72 73 static inline int64_t 74 div_s64(int64_t dividend, int32_t divisor) 75 { 76 77 return (dividend / divisor); 78 } 79 80 static inline uint64_t 81 div_u64(uint64_t dividend, uint32_t divisor) 82 { 83 84 return (dividend / divisor); 85 } 86 87 static inline uint64_t 88 mul_u32_u32(uint32_t a, uint32_t b) 89 { 90 91 return ((uint64_t)a * b); 92 } 93 94 static inline uint64_t 95 div64_u64_round_up(uint64_t dividend, uint64_t divisor) 96 { 97 return ((dividend + divisor - 1) / divisor); 98 } 99 100 #define DIV64_U64_ROUND_UP(...) \ 101 div64_u64_round_up(__VA_ARGS__) 102 103 static inline uint64_t 104 mul_u64_u32_div(uint64_t x, uint32_t y, uint32_t div) 105 { 106 const uint64_t rem = x % div; 107 108 return ((x / div) * y + (rem * y) / div); 109 } 110 111 static inline uint64_t 112 mul_u64_u32_shr(uint64_t x, uint32_t y, unsigned int shift) 113 { 114 uint32_t hi, lo; 115 hi = x >> 32; 116 lo = x & 0xffffffff; 117 118 return (mul_u32_u32(lo, y) >> shift) + 119 (mul_u32_u32(hi, y) << (32 - shift)); 120 } 121 122 #endif /* _LINUXKPI_LINUX_MATH64_H */ 123