#ifndef _ASM_GENERIC_DIV64_H#define _ASM_GENERIC_DIV64_H/* * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com> * Based on former asm-ppc/div64.h and asm-m68knommu/div64.h * * The semantics of do_div() are: * * uint32_t do_div(uint64_t *n, uint32_t base) * { * 	uint32_t remainder = *n % base; * 	*n = *n / base; * 	return remainder; * } * * NOTE: macro parameter n is evaluated multiple times, *       beware of side effects! */ #include <linux/types.h>#include <linux/compiler.h> #if BITS_PER_LONG == 64 # define do_div(n,base) ({					\	uint32_t __base = (base);				\	uint32_t __rem;						\	__rem = ((uint64_t)(n)) % __base;			\	(n) = ((uint64_t)(n)) / __base;				\	__rem;							\ }) #elif BITS_PER_LONG == 32 extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor); /* The unnecessary pointer compare is there * to check for type safety (n must be 64bit) */# define do_div(n,base) ({				\	uint32_t __base = (base);			\	uint32_t __rem;					\	(void)(((typeof((n)) *)0) == ((uint64_t *)0));	\	if (likely(((n) >> 32) == 0)) {			\		__rem = (uint32_t)(n) % __base;		\		(n) = (uint32_t)(n) / __base;		\	} else 						\		__rem = __div64_32(&(n), __base);	\	__rem;						\ }) #else /* BITS_PER_LONG == ?? */ # error do_div() does not yet support the C64 #endif /* BITS_PER_LONG */ #endif /* _ASM_GENERIC_DIV64_H */