Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

#ifndef _ASM_X86_DIV64_H

#define _ASM_X86_DIV64_H

#ifdef CONFIG_X86_32

#include <linux/types.h>

/*

 * do_div() is NOT a C function. It wants to return

 * two values (the quotient and the remainder), but

 * since that doesn't work very well in C, what it

 * does is:

 *

 * - modifies the 64-bit dividend _in_place_

 * - returns the 32-bit remainder

 *

 * This ends up being the most efficient "calling

 * convention" on x86.

 */

#define do_div(n,base) ({ \

        unsigned long __upper, __low, __high, __mod, __base; \

        __base = (base); \

        asm("":"=a" (__low), "=d" (__high):"A" (n)); \

        __upper = __high; \

        if (__high) { \

                __upper = __high % (__base); \

                __high = __high / (__base); \

        } \

        asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (__base), "0" (__low), "1" (__upper)); \

        asm("":"=A" (n):"a" (__low),"d" (__high)); \

        __mod; \

})

/*

 * (long)X = ((long long)divs) / (long)div

 * (long)rem = ((long long)divs) % (long)div

 *

 * Warning, this will do an exception if X overflows.

 */

#define div_long_long_rem(a,b,c) div_ll_X_l_rem(a,b,c)

static inline long

div_ll_X_l_rem(long long divs, long div, long *rem)

{

        long dum2;

      __asm__("divl %2":"=a"(dum2), "=d"(*rem)

      : "rm"(div), "A"(divs));

        return dum2;

}

extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);

#else

# include <asm-generic/div64.h>

#endif /* CONFIG_X86_32 */

#endif /* _ASM_X86_DIV64_H */