LXR uboot/include/linux/math64.h

   1#ifndef _LINUX_MATH64_H
   2#define _LINUX_MATH64_H
   3
   4#include <linux/types.h>
   5
   6#if BITS_PER_LONG == 64
   7
   8/**
   9 * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
  10 *
  11 * This is commonly provided by 32bit archs to provide an optimized 64bit
  12 * divide.
  13 */
  14static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
  15{
  16        *remainder = dividend % divisor;
  17        return dividend / divisor;
  18}
  19
  20/**
  21 * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
  22 */
  23static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
  24{
  25        *remainder = dividend % divisor;
  26        return dividend / divisor;
  27}
  28
  29/**
  30 * div64_u64 - unsigned 64bit divide with 64bit divisor
  31 */
  32static inline u64 div64_u64(u64 dividend, u64 divisor)
  33{
  34        return dividend / divisor;
  35}
  36
  37#elif BITS_PER_LONG == 32
  38
  39#ifndef div_u64_rem
  40static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
  41{
  42        *remainder = do_div(dividend, divisor);
  43        return dividend;
  44}
  45#endif
  46
  47#ifndef div_s64_rem
  48extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder);
  49#endif
  50
  51#ifndef div64_u64
  52extern u64 div64_u64(u64 dividend, u64 divisor);
  53#endif
  54
  55#endif /* BITS_PER_LONG */
  56
  57/**
  58 * div_u64 - unsigned 64bit divide with 32bit divisor
  59 *
  60 * This is the most common 64bit divide and should be used if possible,
  61 * as many 32bit archs can optimize this variant better than a full 64bit
  62 * divide.
  63 */
  64#ifndef div_u64
  65static inline u64 div_u64(u64 dividend, u32 divisor)
  66{
  67        u32 remainder;
  68        return div_u64_rem(dividend, divisor, &remainder);
  69}
  70#endif
  71
  72/**
  73 * div_s64 - signed 64bit divide with 32bit divisor
  74 */
  75#ifndef div_s64
  76static inline s64 div_s64(s64 dividend, s32 divisor)
  77{
  78        s32 remainder;
  79        return div_s64_rem(dividend, divisor, &remainder);
  80}
  81#endif
  82
  83u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder);
  84
  85#endif /* _LINUX_MATH64_H */
  86