1*f7c086e9SDirk Behme #ifndef _ASM_GENERIC_DIV64_H 2*f7c086e9SDirk Behme #define _ASM_GENERIC_DIV64_H 3*f7c086e9SDirk Behme /* 4*f7c086e9SDirk Behme * Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com> 5*f7c086e9SDirk Behme * Based on former asm-ppc/div64.h and asm-m68knommu/div64.h 6*f7c086e9SDirk Behme * 7*f7c086e9SDirk Behme * The semantics of do_div() are: 8*f7c086e9SDirk Behme * 9*f7c086e9SDirk Behme * uint32_t do_div(uint64_t *n, uint32_t base) 10*f7c086e9SDirk Behme * { 11*f7c086e9SDirk Behme * uint32_t remainder = *n % base; 12*f7c086e9SDirk Behme * *n = *n / base; 13*f7c086e9SDirk Behme * return remainder; 14*f7c086e9SDirk Behme * } 15*f7c086e9SDirk Behme * 16*f7c086e9SDirk Behme * NOTE: macro parameter n is evaluated multiple times, 17*f7c086e9SDirk Behme * beware of side effects! 18*f7c086e9SDirk Behme */ 19*f7c086e9SDirk Behme 20*f7c086e9SDirk Behme #include <linux/types.h> 21*f7c086e9SDirk Behme 22*f7c086e9SDirk Behme extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor); 23*f7c086e9SDirk Behme 24*f7c086e9SDirk Behme /* The unnecessary pointer compare is there 25*f7c086e9SDirk Behme * to check for type safety (n must be 64bit) 26*f7c086e9SDirk Behme */ 27*f7c086e9SDirk Behme # define do_div(n,base) ({ \ 28*f7c086e9SDirk Behme uint32_t __base = (base); \ 29*f7c086e9SDirk Behme uint32_t __rem; \ 30*f7c086e9SDirk Behme (void)(((typeof((n)) *)0) == ((uint64_t *)0)); \ 31*f7c086e9SDirk Behme if (((n) >> 32) == 0) { \ 32*f7c086e9SDirk Behme __rem = (uint32_t)(n) % __base; \ 33*f7c086e9SDirk Behme (n) = (uint32_t)(n) / __base; \ 34*f7c086e9SDirk Behme } else \ 35*f7c086e9SDirk Behme __rem = __div64_32(&(n), __base); \ 36*f7c086e9SDirk Behme __rem; \ 37*f7c086e9SDirk Behme }) 38*f7c086e9SDirk Behme 39*f7c086e9SDirk Behme #endif /* _ASM_GENERIC_DIV64_H */ 40