40 lines
1023 B
C
40 lines
1023 B
C
#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>
|
|
|
|
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 (((n) >> 32) == 0) { \
|
|
__rem = (uint32_t)(n) % __base; \
|
|
(n) = (uint32_t)(n) / __base; \
|
|
} else \
|
|
__rem = __div64_32(&(n), __base); \
|
|
__rem; \
|
|
})
|
|
|
|
#endif /* _ASM_GENERIC_DIV64_H */
|