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Diffstat (limited to 'c_src/include/linux/math64.h')
-rw-r--r-- | c_src/include/linux/math64.h | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/c_src/include/linux/math64.h b/c_src/include/linux/math64.h new file mode 100644 index 00000000..5eb6f064 --- /dev/null +++ b/c_src/include/linux/math64.h @@ -0,0 +1,85 @@ +#ifndef _LINUX_MATH64_H +#define _LINUX_MATH64_H + +#include <linux/types.h> + +#define do_div(n,base) ({ \ + u32 __base = (base); \ + u32 __rem; \ + __rem = ((u64)(n)) % __base; \ + (n) = ((u64)(n)) / __base; \ + __rem; \ + }) + +#define div64_long(x, y) div64_s64((x), (y)) +#define div64_ul(x, y) div64_u64((x), (y)) + +/** + * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder + * + * This is commonly provided by 32bit archs to provide an optimized 64bit + * divide. + */ +static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) +{ + *remainder = dividend % divisor; + return dividend / divisor; +} + +/** + * div_s64_rem - signed 64bit divide with 32bit divisor with remainder + */ +static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder) +{ + *remainder = dividend % divisor; + return dividend / divisor; +} + +/** + * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder + */ +static inline u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder) +{ + *remainder = dividend % divisor; + return dividend / divisor; +} + +/** + * div64_u64 - unsigned 64bit divide with 64bit divisor + */ +static inline u64 div64_u64(u64 dividend, u64 divisor) +{ + return dividend / divisor; +} + +/** + * div64_s64 - signed 64bit divide with 64bit divisor + */ +static inline s64 div64_s64(s64 dividend, s64 divisor) +{ + return dividend / divisor; +} + +/** + * div_u64 - unsigned 64bit divide with 32bit divisor + * + * This is the most common 64bit divide and should be used if possible, + * as many 32bit archs can optimize this variant better than a full 64bit + * divide. + */ +static inline u64 div_u64(u64 dividend, u32 divisor) +{ + u32 remainder; + return div_u64_rem(dividend, divisor, &remainder); +} + +/** + * div_s64 - signed 64bit divide with 32bit divisor + */ +static inline s64 div_s64(s64 dividend, s32 divisor) +{ + s32 remainder; + return div_s64_rem(dividend, divisor, &remainder); +} + +#endif /* _LINUX_MATH64_H */ |