| #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 */ |