sys/dev/drm/include/linux/math64.h

   1 /*-
   2  * Copyright (c) 2007 Cisco Systems, Inc.  All rights reserved.
   3  * Copyright (c) 2014-2015 Mellanox Technologies, Ltd. All rights reserved.
   4  * Copyright (c) 2016-2017 François Tigeot
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice unmodified, this list of conditions, and the following
  12  *    disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * $FreeBSD: head/sys/compat/linuxkpi/common/include/linux/math64.h 290135 2015-10-29 08:28:39Z hselasky $
  29  */
  30
  31 #ifndef _LINUX_MATH64_H
  32 #define _LINUX_MATH64_H
  33
  34 #include <linux/types.h>
  35
  36 #define do_div(n, base) ({                      \
  37         uint32_t __base = (base);               \
  38         uint32_t __rem;                         \
  39         __rem = ((uint64_t)(n)) % __base;       \
  40         (n) = ((uint64_t)(n)) / __base;         \
  41         __rem;                                  \
  42 })
  43
  44 static inline uint64_t
  45 div_u64_rem(uint64_t dividend, uint32_t divisor, uint32_t *remainder)
  46 {
  47         *remainder = dividend % divisor;
  48         return (dividend / divisor);
  49 }
  50
  51 static inline uint64_t
  52 div64_u64(uint64_t dividend, uint64_t divisor)
  53 {
  54         return (dividend / divisor);
  55 }
  56
  57 static inline int64_t
  58 div64_s64(int64_t dividend, int64_t divisor)
  59 {
  60         return (dividend / divisor);
  61 }
  62
  63 static inline uint64_t
  64 div_u64(uint64_t dividend, uint32_t divisor)
  65 {
  66         return (dividend / divisor);
  67 }
  68
  69 static inline int64_t
  70 div_s64(int64_t dividend, int32_t divisor)
  71 {
  72         return (dividend / divisor);
  73 }
  74
  75 static inline u64
  76 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
  77 {
  78         *remainder = dividend % divisor;
  79         return (dividend / divisor);
  80 }
  81
  82 #endif  /* _LINUX_MATH64_H */