1/*- 2 * Copyright (c) 2015 Mark R V Murray 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#ifndef SYS_DEV_RANDOM_UINT128_H_INCLUDED 28#define SYS_DEV_RANDOM_UINT128_H_INCLUDED 29 30#include <sys/endian.h> 31 32/* This whole thing is a crock :-( 33 * 34 * Everyone knows you always need the __uint128_t types! 35 */ 36 37#ifdef __SIZEOF_INT128__ 38#define USE_REAL_UINT128_T 39#endif 40 41#ifdef USE_REAL_UINT128_T 42typedef __uint128_t uint128_t; 43#define UINT128_ZERO 0ULL 44#else 45typedef struct { 46 /* Ignore endianness */ 47 uint64_t u128t_word0; 48 uint64_t u128t_word1; 49} uint128_t; 50static const uint128_t very_long_zero = {0UL,0UL}; 51#define UINT128_ZERO very_long_zero 52#endif 53 54static __inline void 55uint128_increment(uint128_t *big_uintp) 56{ 57#ifdef USE_REAL_UINT128_T 58 (*big_uintp)++; 59#else 60 big_uintp->u128t_word0++; 61 if (big_uintp->u128t_word0 == 0UL) 62 big_uintp->u128t_word1++; 63#endif 64} 65 66static __inline void 67uint128_add64(uint128_t *big_uintp, uint64_t add) 68{ 69#ifdef USE_REAL_UINT128_T 70 (*big_uintp) += add; 71#else 72 uint64_t word0p; 73 74 word0p = big_uintp->u128t_word0 + add; 75 if (word0p < big_uintp->u128t_word0) 76 big_uintp->u128t_word1++; 77 big_uintp->u128t_word0 = word0p; 78#endif 79} 80 81static __inline bool 82uint128_equals(uint128_t a, uint128_t b) 83{ 84#ifdef USE_REAL_UINT128_T 85 return (a == b); 86#else 87 return (a.u128t_word0 == b.u128t_word0 && 88 a.u128t_word1 == b.u128t_word1); 89#endif 90} 91 92static __inline int 93uint128_is_zero(uint128_t big_uint) 94{ 95 return (uint128_equals(big_uint, UINT128_ZERO)); 96} 97 98static __inline uint128_t 99le128dec(const void *pp) 100{ 101 const uint8_t *p = pp; 102 103#ifdef USE_REAL_UINT128_T 104 return (((uint128_t)le64dec(p + 8) << 64) | le64dec(p)); 105#else 106 return ((uint128_t){ 107 .u128t_word0 = le64dec(p), 108 .u128t_word1 = le64dec(p + 8), 109 }); 110#endif 111} 112 113static __inline void 114le128enc(void *pp, uint128_t u) 115{ 116 uint8_t *p = pp; 117 118#ifdef USE_REAL_UINT128_T 119 le64enc(p, (uint64_t)(u & UINT64_MAX)); 120 le64enc(p + 8, (uint64_t)(u >> 64)); 121#else 122 le64enc(p, u.u128t_word0); 123 le64enc(p + 8, u.u128t_word1); 124#endif 125} 126 127#endif /* SYS_DEV_RANDOM_UINT128_H_INCLUDED */ 128