kernel/2.6.29.6-aldebaran-rt/arch/m68k/include/asm/div64_mm.h

   1 #ifndef _M68K_DIV64_H
   2 #define _M68K_DIV64_H
   3
   4 #include <linux/types.h>
   5
   6 /* n = n / base; return rem; */
   7
   8 #define do_div(n, base) ({                                      \
   9         union {                                                 \
  10                 unsigned long n32[2];                           \
  11                 unsigned long long n64;                         \
  12         } __n;                                                  \
  13         unsigned long __rem, __upper;                           \
  14                                                                 \
  15         __n.n64 = (n);                                          \
  16         if ((__upper = __n.n32[0])) {                           \
  17                 asm ("divul.l %2,%1:%0"                         \
  18                         : "=d" (__n.n32[0]), "=d" (__upper)     \
  19                         : "d" (base), "0" (__n.n32[0]));        \
  20         }                                                       \
  21         asm ("divu.l %2,%1:%0"                                  \
  22                 : "=d" (__n.n32[1]), "=d" (__rem)               \
  23                 : "d" (base), "1" (__upper), "0" (__n.n32[1])); \
  24         (n) = __n.n64;                                          \
  25         __rem;                                                  \
  26 })
  27
  28 #endif /* _M68K_DIV64_H */