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Linux/arch/m68k/include/asm/div64.h

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  1 #ifndef _M68K_DIV64_H
  2 #define _M68K_DIV64_H
  3 
  4 #ifdef CONFIG_CPU_HAS_NO_MULDIV64
  5 #include <asm-generic/div64.h>
  6 #else
  7 
  8 #include <linux/types.h>
  9 
 10 /* n = n / base; return rem; */
 11 
 12 #define do_div(n, base) ({                                      \
 13         union {                                                 \
 14                 unsigned long n32[2];                           \
 15                 unsigned long long n64;                         \
 16         } __n;                                                  \
 17         unsigned long __rem, __upper;                           \
 18         unsigned long __base = (base);                          \
 19                                                                 \
 20         __n.n64 = (n);                                          \
 21         if ((__upper = __n.n32[0])) {                           \
 22                 asm ("divul.l %2,%1:%0"                         \
 23                      : "=d" (__n.n32[0]), "=d" (__upper)        \
 24                      : "d" (__base), "" (__n.n32[0]));         \
 25         }                                                       \
 26         asm ("divu.l %2,%1:%0"                                  \
 27              : "=d" (__n.n32[1]), "=d" (__rem)                  \
 28              : "d" (__base), "1" (__upper), "" (__n.n32[1]));  \
 29         (n) = __n.n64;                                          \
 30         __rem;                                                  \
 31 })
 32 
 33 #endif /* CONFIG_CPU_HAS_NO_MULDIV64 */
 34 
 35 #endif /* _M68K_DIV64_H */
 36 

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