Viewing file:  calc64.h (1.3 KB) -rw-r--r--
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#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
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