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 * $FreeBSD$ 27 */ 28 29 #ifndef SYS_DEV_RANDOM_UINT128_H_INCLUDED 30 #define SYS_DEV_RANDOM_UINT128_H_INCLUDED 31 32 #include <sys/endian.h> 33 34 /* This whole thing is a crock :-( 35 * 36 * Everyone knows you always need the __uint128_t types! 37 */ 38 39 #ifdef __SIZEOF_INT128__ 40 #define USE_REAL_UINT128_T 41 #endif 42 43 #ifdef USE_REAL_UINT128_T 44 typedef __uint128_t uint128_t; 45 #define UINT128_ZERO 0ULL 46 #else 47 typedef struct { 48 /* Ignore endianness */ 49 uint64_t u128t_word0; 50 uint64_t u128t_word1; 51 } uint128_t; 52 static const uint128_t very_long_zero = {0UL,0UL}; 53 #define UINT128_ZERO very_long_zero 54 #endif 55 56 static __inline void 57 uint128_increment(uint128_t *big_uintp) 58 { 59 #ifdef USE_REAL_UINT128_T 60 (*big_uintp)++; 61 #else 62 big_uintp->u128t_word0++; 63 if (big_uintp->u128t_word0 == 0UL) 64 big_uintp->u128t_word1++; 65 #endif 66 } 67 68 static __inline bool 69 uint128_equals(uint128_t a, uint128_t b) 70 { 71 #ifdef USE_REAL_UINT128_T 72 return (a == b); 73 #else 74 return (a.u128t_word0 == b.u128t_word0 && 75 a.u128t_word1 == b.u128t_word1); 76 #endif 77 } 78 79 static __inline int 80 uint128_is_zero(uint128_t big_uint) 81 { 82 return (uint128_equals(big_uint, UINT128_ZERO)); 83 } 84 85 static __inline uint128_t 86 le128dec(const void *pp) 87 { 88 const uint8_t *p = pp; 89 90 #ifdef USE_REAL_UINT128_T 91 return (((uint128_t)le64dec(p + 8) << 64) | le64dec(p)); 92 #else 93 return ((uint128_t){ 94 .u128t_word0 = le64dec(p), 95 .u128t_word1 = le64dec(p + 8), 96 }); 97 #endif 98 } 99 100 static __inline void 101 le128enc(void *pp, uint128_t u) 102 { 103 uint8_t *p = pp; 104 105 #ifdef USE_REAL_UINT128_T 106 le64enc(p, (uint64_t)(u & UINT64_MAX)); 107 le64enc(p + 8, (uint64_t)(u >> 64)); 108 #else 109 le64enc(p, u.u128t_word0); 110 le64enc(p + 8, u.u128t_word1); 111 #endif 112 } 113 114 #endif /* SYS_DEV_RANDOM_UINT128_H_INCLUDED */ 115