1 #ifndef _LINUX_MATH64_H
2 #define _LINUX_MATH64_H
4 #include <linux/types.h>
6 #define do_div(n,base) ({ \
9 __rem = ((u64)(n)) % __base; \
10 (n) = ((u64)(n)) / __base; \
14 #define div64_long(x, y) div64_s64((x), (y))
15 #define div64_ul(x, y) div64_u64((x), (y))
18 * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
20 * This is commonly provided by 32bit archs to provide an optimized 64bit
23 static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
25 *remainder = dividend % divisor;
26 return dividend / divisor;
30 * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
32 static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder)
34 *remainder = dividend % divisor;
35 return dividend / divisor;
39 * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder
41 static inline u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder)
43 *remainder = dividend % divisor;
44 return dividend / divisor;
48 * div64_u64 - unsigned 64bit divide with 64bit divisor
50 static inline u64 div64_u64(u64 dividend, u64 divisor)
52 return dividend / divisor;
56 * div64_s64 - signed 64bit divide with 64bit divisor
58 static inline s64 div64_s64(s64 dividend, s64 divisor)
60 return dividend / divisor;
64 * div_u64 - unsigned 64bit divide with 32bit divisor
66 * This is the most common 64bit divide and should be used if possible,
67 * as many 32bit archs can optimize this variant better than a full 64bit
70 static inline u64 div_u64(u64 dividend, u32 divisor)
73 return div_u64_rem(dividend, divisor, &remainder);
77 * div_s64 - signed 64bit divide with 32bit divisor
79 static inline s64 div_s64(s64 dividend, s32 divisor)
82 return div_s64_rem(dividend, divisor, &remainder);
85 #endif /* _LINUX_MATH64_H */