1#ifndef _LINUX_MATH64_H 2#define _LINUX_MATH64_H 3 4#include <linux/types.h> 5#include <asm/div64.h> 6 7#if BITS_PER_LONG == 64 8 9#define div64_long(x, y) div64_s64((x), (y)) 10#define div64_ul(x, y) div64_u64((x), (y)) 11 12/** 13 * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder 14 * 15 * This is commonly provided by 32bit archs to provide an optimized 64bit 16 * divide. 17 */ 18static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) 19{ 20 *remainder = dividend % divisor; 21 return dividend / divisor; 22} 23 24/** 25 * div_s64_rem - signed 64bit divide with 32bit divisor with remainder 26 */ 27static inline s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder) 28{ 29 *remainder = dividend % divisor; 30 return dividend / divisor; 31} 32 33/** 34 * div64_u64_rem - unsigned 64bit divide with 64bit divisor and remainder 35 */ 36static inline u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder) 37{ 38 *remainder = dividend % divisor; 39 return dividend / divisor; 40} 41 42/** 43 * div64_u64 - unsigned 64bit divide with 64bit divisor 44 */ 45static inline u64 div64_u64(u64 dividend, u64 divisor) 46{ 47 return dividend / divisor; 48} 49 50/** 51 * div64_s64 - signed 64bit divide with 64bit divisor 52 */ 53static inline s64 div64_s64(s64 dividend, s64 divisor) 54{ 55 return dividend / divisor; 56} 57 58#elif BITS_PER_LONG == 32 59 60#define div64_long(x, y) div_s64((x), (y)) 61#define div64_ul(x, y) div_u64((x), (y)) 62 63#ifndef div_u64_rem 64static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder) 65{ 66 *remainder = do_div(dividend, divisor); 67 return dividend; 68} 69#endif 70 71#ifndef div_s64_rem 72extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder); 73#endif 74 75#ifndef div64_u64_rem 76extern u64 div64_u64_rem(u64 dividend, u64 divisor, u64 *remainder); 77#endif 78 79#ifndef div64_u64 80extern u64 div64_u64(u64 dividend, u64 divisor); 81#endif 82 83#ifndef div64_s64 84extern s64 div64_s64(s64 dividend, s64 divisor); 85#endif 86 87#endif /* BITS_PER_LONG */ 88 89/** 90 * div_u64 - unsigned 64bit divide with 32bit divisor 91 * 92 * This is the most common 64bit divide and should be used if possible, 93 * as many 32bit archs can optimize this variant better than a full 64bit 94 * divide. 95 */ 96#ifndef div_u64 97static inline u64 div_u64(u64 dividend, u32 divisor) 98{ 99 u32 remainder; 100 return div_u64_rem(dividend, divisor, &remainder); 101} 102#endif 103 104/** 105 * div_s64 - signed 64bit divide with 32bit divisor 106 */ 107#ifndef div_s64 108static inline s64 div_s64(s64 dividend, s32 divisor) 109{ 110 s32 remainder; 111 return div_s64_rem(dividend, divisor, &remainder); 112} 113#endif 114 115u32 iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder); 116 117static __always_inline u32 118__iter_div_u64_rem(u64 dividend, u32 divisor, u64 *remainder) 119{ 120 u32 ret = 0; 121 122 while (dividend >= divisor) { 123 /* The following asm() prevents the compiler from 124 optimising this loop into a modulo operation. */ 125 asm("" : "+rm"(dividend)); 126 127 dividend -= divisor; 128 ret++; 129 } 130 131 *remainder = dividend; 132 133 return ret; 134} 135 136#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__) 137 138#ifndef mul_u64_u32_shr 139static inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift) 140{ 141 return (u64)(((unsigned __int128)a * mul) >> shift); 142} 143#endif /* mul_u64_u32_shr */ 144 145#else 146 147#ifndef mul_u64_u32_shr 148static inline u64 mul_u64_u32_shr(u64 a, u32 mul, unsigned int shift) 149{ 150 u32 ah, al; 151 u64 ret; 152 153 al = a; 154 ah = a >> 32; 155 156 ret = ((u64)al * mul) >> shift; 157 if (ah) 158 ret += ((u64)ah * mul) << (32 - shift); 159 160 return ret; 161} 162#endif /* mul_u64_u32_shr */ 163 164#endif 165 166#endif /* _LINUX_MATH64_H */ 167