50 строки
1.3 KiB
C
50 строки
1.3 KiB
C
#ifndef _LINUX_CALC64_H
|
|
#define _LINUX_CALC64_H
|
|
|
|
#include <linux/types.h>
|
|
#include <asm/div64.h>
|
|
|
|
/*
|
|
* This is a generic macro which is used when the architecture
|
|
* specific div64.h does not provide a optimized one.
|
|
*
|
|
* The 64bit dividend is divided by the divisor (data type long), the
|
|
* result is returned and the remainder stored in the variable
|
|
* referenced by remainder (data type long *). In contrast to the
|
|
* do_div macro the dividend is kept intact.
|
|
*/
|
|
#ifndef div_long_long_rem
|
|
#define div_long_long_rem(dividend, divisor, remainder) \
|
|
do_div_llr((dividend), divisor, remainder)
|
|
|
|
static inline unsigned long do_div_llr(const long long dividend,
|
|
const long divisor, long *remainder)
|
|
{
|
|
u64 result = dividend;
|
|
|
|
*(remainder) = do_div(result, divisor);
|
|
return (unsigned long) result;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Sign aware variation of the above. On some architectures a
|
|
* negative dividend leads to an divide overflow exception, which
|
|
* is avoided by the sign check.
|
|
*/
|
|
static inline long div_long_long_rem_signed(const long long dividend,
|
|
const long divisor, long *remainder)
|
|
{
|
|
long res;
|
|
|
|
if (unlikely(dividend < 0)) {
|
|
res = -div_long_long_rem(-dividend, divisor, remainder);
|
|
*remainder = -(*remainder);
|
|
} else
|
|
res = div_long_long_rem(dividend, divisor, remainder);
|
|
|
|
return res;
|
|
}
|
|
|
|
#endif
|