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- #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; \
- })
- /* Wrapper for do_div(). Doesn't modify dividend and returns
- * the result, not reminder.
- */
- static inline uint64_t lldiv(uint64_t dividend, uint32_t divisor)
- {
- uint64_t __res = dividend;
- do_div(__res, divisor);
- return(__res);
- }
- #endif /* _ASM_GENERIC_DIV64_H */
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