[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / asm-x86 / div64.h

#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 */
Commit	Line	Data
428c5a23 CS	1	#ifndef _ASM_X86_DIV64_H
	2	#define _ASM_X86_DIV64_H
	3
96a388de	4	#ifdef CONFIG_X86_32
428c5a23 CS	5
	6	#include <linux/types.h>
	7
	8	/*
	9	* do_div() is NOT a C function. It wants to return
	10	* two values (the quotient and the remainder), but
	11	* since that doesn't work very well in C, what it
	12	* does is:
	13	*
	14	* - modifies the 64-bit dividend _in_place_
	15	* - returns the 32-bit remainder
	16	*
	17	* This ends up being the most efficient "calling
	18	* convention" on x86.
	19	*/
	20	#define do_div(n,base) ({ \
	21	unsigned long __upper, __low, __high, __mod, __base; \
	22	__base = (base); \
	23	asm("":"=a" (__low), "=d" (__high):"A" (n)); \
	24	__upper = __high; \
	25	if (__high) { \
	26	__upper = __high % (__base); \
	27	__high = __high / (__base); \
	28	} \
	29	asm("divl %2":"=a" (__low), "=d" (__mod):"rm" (__base), "0" (__low), "1" (__upper)); \
	30	asm("":"=A" (n):"a" (__low),"d" (__high)); \
	31	__mod; \
	32	})
	33
	34	/*
	35	* (long)X = ((long long)divs) / (long)div
	36	* (long)rem = ((long long)divs) % (long)div
	37	*
	38	* Warning, this will do an exception if X overflows.
	39	*/
	40	#define div_long_long_rem(a,b,c) div_ll_X_l_rem(a,b,c)
	41
	42	static inline long
	43	div_ll_X_l_rem(long long divs, long div, long *rem)
	44	{
	45	long dum2;
	46	__asm__("divl %2":"=a"(dum2), "=d"(*rem)
	47	: "rm"(div), "A"(divs));
	48
	49	return dum2;
	50
	51	}
	52
	53	extern uint64_t div64_64(uint64_t dividend, uint64_t divisor);
	54
96a388de	55	#else
428c5a23 CS	56	# include <asm-generic/div64.h>
	57	#endif /* CONFIG_X86_32 */
	58
	59	#endif /* _ASM_X86_DIV64_H */