1f7c086e9SDirk Behme #ifndef _ASM_GENERIC_DIV64_H 2f7c086e9SDirk Behme #define _ASM_GENERIC_DIV64_H 3f7c086e9SDirk Behme /* 4f7c086e9SDirk Behme * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com> 5f7c086e9SDirk Behme * Based on former asm-ppc/div64.h and asm-m68knommu/div64.h 6f7c086e9SDirk Behme * 7f7c086e9SDirk Behme * The semantics of do_div() are: 8f7c086e9SDirk Behme * 9f7c086e9SDirk Behme * uint32_t do_div(uint64_t *n, uint32_t base) 10f7c086e9SDirk Behme * { 11f7c086e9SDirk Behme * uint32_t remainder = *n % base; 12f7c086e9SDirk Behme * *n = *n / base; 13f7c086e9SDirk Behme * return remainder; 14f7c086e9SDirk Behme * } 15f7c086e9SDirk Behme * 16f7c086e9SDirk Behme * NOTE: macro parameter n is evaluated multiple times, 17f7c086e9SDirk Behme * beware of side effects! 18f7c086e9SDirk Behme */ 19f7c086e9SDirk Behme 20f7c086e9SDirk Behme #include <linux/types.h> 21f7c086e9SDirk Behme 22f7c086e9SDirk Behme extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor); 23f7c086e9SDirk Behme 24f7c086e9SDirk Behme /* The unnecessary pointer compare is there 25f7c086e9SDirk Behme * to check for type safety (n must be 64bit) 26f7c086e9SDirk Behme */ 27f7c086e9SDirk Behme # define do_div(n,base) ({ \ 28f7c086e9SDirk Behme uint32_t __base = (base); \ 29f7c086e9SDirk Behme uint32_t __rem; \ 30f7c086e9SDirk Behme (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \ 31f7c086e9SDirk Behme if (((n) >> 32) == 0) { \ 32f7c086e9SDirk Behme __rem = (uint32_t)(n) % __base; \ 33f7c086e9SDirk Behme (n) = (uint32_t)(n) / __base; \ 34f7c086e9SDirk Behme } else \ 35f7c086e9SDirk Behme __rem = __div64_32(&(n), __base); \ 36f7c086e9SDirk Behme __rem; \ 37f7c086e9SDirk Behme }) 38f7c086e9SDirk Behme 39*3feb647fSSergei Poselenov /* Wrapper for do_div(). Doesn't modify dividend and returns 40*3feb647fSSergei Poselenov * the result, not reminder. 41*3feb647fSSergei Poselenov */ 42*3feb647fSSergei Poselenov static inline uint64_t lldiv(uint64_t dividend, uint32_t divisor) 43*3feb647fSSergei Poselenov { 44*3feb647fSSergei Poselenov uint64_t __res = dividend; 45*3feb647fSSergei Poselenov do_div(__res, divisor); 46*3feb647fSSergei Poselenov return(__res); 47*3feb647fSSergei Poselenov } 48*3feb647fSSergei Poselenov 49f7c086e9SDirk Behme #endif /* _ASM_GENERIC_DIV64_H */ 50