1 #ifndef _LINUX_CALC64_H 2 #define _LINUX_CALC64_H 3 4 #include <linux/types.h> 5 #include <asm/div64.h> 6 7 /* 8 * This is a generic macro which is used when the architecture 9 * specific div64.h does not provide a optimized one. 10 * 11 * The 64bit dividend is divided by the divisor (data type long), the 12 * result is returned and the remainder stored in the variable 13 * referenced by remainder (data type long *). In contrast to the 14 * do_div macro the dividend is kept intact. 15 */ 16 #ifndef div_long_long_rem 17 #define div_long_long_rem(dividend, divisor, remainder) \ 18 do_div_llr((dividend), divisor, remainder) 19 20 static inline unsigned long do_div_llr(const long long dividend, 21 const long divisor, long *remainder) 22 { 23 u64 result = dividend; 24 25 *(remainder) = do_div(result, divisor); 26 return (unsigned long) result; 27 } 28 #endif 29 30 /* 31 * Sign aware variation of the above. On some architectures a 32 * negative dividend leads to an divide overflow exception, which 33 * is avoided by the sign check. 34 */ 35 static inline long div_long_long_rem_signed(const long long dividend, 36 const long divisor, long *remainder) 37 { 38 long res; 39 40 if (unlikely(dividend < 0)) { 41 res = -div_long_long_rem(-dividend, divisor, remainder); 42 *remainder = -(*remainder); 43 } else 44 res = div_long_long_rem(dividend, divisor, remainder); 45 46 return res; 47 } 48 49 #endif 50
