release/src-rt-6.x.4708/linux/linux-2.6.36/arch/m68k/include/asm/div64.h

   1 #ifndef _M68K_DIV64_H
   2 #define _M68K_DIV64_H
   3
   4 #ifdef CONFIG_MMU
   5
   6 #include <linux/types.h>
   7
   8 /* n = n / base; return rem; */
   9
  10 #define do_div(n, base) ({                                      \
  11         union {                                                 \
  12                 unsigned long n32[2];                           \
  13                 unsigned long long n64;                         \
  14         } __n;                                                  \
  15         unsigned long __rem, __upper;                           \
  16                                                                 \
  17         __n.n64 = (n);                                          \
  18         if ((__upper = __n.n32[0])) {                           \
  19                 asm ("divul.l %2,%1:%0"                         \
  20                         : "=d" (__n.n32[0]), "=d" (__upper)     \
  21                         : "d" (base), "0" (__n.n32[0]));        \
  22         }                                                       \
  23         asm ("divu.l %2,%1:%0"                                  \
  24                 : "=d" (__n.n32[1]), "=d" (__rem)               \
  25                 : "d" (base), "1" (__upper), "0" (__n.n32[1])); \
  26         (n) = __n.n64;                                          \
  27         __rem;                                                  \
  28 })
  29
  30 #else
  31 #include <asm-generic/div64.h>
  32 #endif /* CONFIG_MMU */
  33
  34 #endif /* _M68K_DIV64_H */