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 /* 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 42 typedef __uint128_t uint128_t; 43 #define UINT128_ZERO 0ULL 44 #else 45 typedef struct { 46 /* Ignore endianness */ 47 uint64_t u128t_word0; 48 uint64_t u128t_word1; 49 } uint128_t; 50 static const uint128_t very_long_zero = {0UL,0UL}; 51 #define UINT128_ZERO very_long_zero 52 #endif 53 54 static __inline void 55 uint128_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 66 static __inline int 67 uint128_is_zero(uint128_t big_uint) 68 { 69 #ifdef USE_REAL_UINT128_T 70 return (big_uint == UINT128_ZERO); 71 #else 72 return (big_uint.u128t_word0 == 0UL && big_uint.u128t_word1 == 0UL); 73 #endif 74 } 75 76 #endif /* SYS_DEV_RANDOM_UINT128_H_INCLUDED */ 77