FreeBSD/Linux Kernel Cross Reference
sys/compat/linuxkpi/common/include/linux/math64.h

     /*-
      * Copyright (c) 2007 Cisco Systems, Inc.  All rights reserved.
      * Copyright (c) 2014-2015 Mellanox Technologies, Ltd. All rights reserved.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice unmodified, this list of conditions, and the following
     *    disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $FreeBSD$
     */
    
    #ifndef _LINUXKPI_LINUX_MATH64_H
    #define _LINUXKPI_LINUX_MATH64_H
    
    #include <sys/stdint.h>
    
    #define do_div(n, base) ({                      \
            uint32_t __base = (base);               \
            uint32_t __rem;                         \
            __rem = ((uint64_t)(n)) % __base;       \
            (n) = ((uint64_t)(n)) / __base;         \
            __rem;                                  \
    })
    
    static inline uint64_t
    div64_u64_rem(uint64_t dividend, uint64_t divisor, uint64_t *remainder)
    {
    
            *remainder = dividend % divisor;
            return (dividend / divisor);
    }
    
    static inline int64_t
    div64_s64(int64_t dividend, int64_t divisor)
    {
    
            return (dividend / divisor);
    }
    
    static inline uint64_t
    div64_u64(uint64_t dividend, uint64_t divisor)
    {
    
            return (dividend / divisor);
    }
    
    static inline uint64_t
    div_u64_rem(uint64_t dividend, uint32_t divisor, uint32_t *remainder)
    {
    
            *remainder = dividend % divisor;
            return (dividend / divisor);
    }
    
    static inline int64_t
    div_s64(int64_t dividend, int32_t divisor)
    {
    
            return (dividend / divisor);
    }
    
    static inline uint64_t
    div_u64(uint64_t dividend, uint32_t divisor)
    {
    
            return (dividend / divisor);
    }
    
    static inline uint64_t
    mul_u32_u32(uint32_t a, uint32_t b)
    {
    
            return ((uint64_t)a * b);
    }
    
    static inline uint64_t
    div64_u64_round_up(uint64_t dividend, uint64_t divisor)
    {
            return ((dividend + divisor - 1) / divisor);
    }
    
   #define DIV64_U64_ROUND_UP(...) \
           div64_u64_round_up(__VA_ARGS__)
   
   static inline uint64_t
   mul_u64_u32_div(uint64_t x, uint32_t y, uint32_t div)
   {
           const uint64_t rem = x % div;
   
           return ((x / div) * y + (rem * y) / div);
   }
   
   static inline uint64_t
   mul_u64_u32_shr(uint64_t x, uint32_t y, unsigned int shift)
   {
           uint32_t hi, lo;
           hi = x >> 32;
           lo = x & 0xffffffff;
   
           return (mul_u32_u32(lo, y) >> shift) +
                   (mul_u32_u32(hi, y) << (32 - shift));
   }
   
   #endif /* _LINUXKPI_LINUX_MATH64_H */

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