1 /*- 2 * Copyright (c) 2014 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 typedef __uint128_t uint128_t; 39 #else 40 typedef uint64_t uint128_t[2]; 41 #endif 42 43 static __inline void 44 uint128_clear(uint128_t *big_uint) 45 { 46 #ifdef __SIZEOF_INT128__ 47 (*big_uint) = 0ULL; 48 #else 49 (*big_uint)[0] = (*big_uint)[1] = 0UL; 50 #endif 51 } 52 53 static __inline void 54 uint128_increment(uint128_t *big_uint) 55 { 56 #ifdef __SIZEOF_INT128__ 57 (*big_uint)++; 58 #else 59 (*big_uint)[0]++; 60 if ((*big_uint)[0] == 0UL) 61 (*big_uint)[1]++; 62 #endif 63 } 64 65 static __inline int 66 uint128_is_zero(uint128_t big_uint) 67 { 68 #ifdef __SIZEOF_INT128__ 69 return (big_uint == 0ULL); 70 #else 71 return (big_uint[0] == 0UL && big_uint[1] == 0UL); 72 #endif 73 } 74 75 #endif /* SYS_DEV_RANDOM_UINT128_H_INCLUDED */ 76