1219820Sjeff/*- 2219820Sjeff * Copyright (c) 2010 Isilon Systems, Inc. 3219820Sjeff * Copyright (c) 2010 iX Systems, Inc. 4219820Sjeff * Copyright (c) 2010 Panasas, Inc. 5289683Shselasky * Copyright (c) 2013-2015 Mellanox Technologies, Ltd. 6219820Sjeff * All rights reserved. 7219820Sjeff * 8219820Sjeff * Redistribution and use in source and binary forms, with or without 9219820Sjeff * modification, are permitted provided that the following conditions 10219820Sjeff * are met: 11219820Sjeff * 1. Redistributions of source code must retain the above copyright 12219820Sjeff * notice unmodified, this list of conditions, and the following 13219820Sjeff * disclaimer. 14219820Sjeff * 2. Redistributions in binary form must reproduce the above copyright 15219820Sjeff * notice, this list of conditions and the following disclaimer in the 16219820Sjeff * documentation and/or other materials provided with the distribution. 17219820Sjeff * 18219820Sjeff * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19219820Sjeff * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20219820Sjeff * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21219820Sjeff * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22219820Sjeff * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23219820Sjeff * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24219820Sjeff * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25219820Sjeff * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26219820Sjeff * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27219820Sjeff * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28289644Shselasky * 29289644Shselasky * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/log2.h 331756 2018-03-30 02:04:46Z emaste $ 30219820Sjeff */ 31219820Sjeff#ifndef _LINUX_LOG2_H_ 32219820Sjeff#define _LINUX_LOG2_H_ 33219820Sjeff 34219820Sjeff#include <linux/types.h> 35219820Sjeff 36219820Sjeff#include <sys/libkern.h> 37219820Sjeff 38219820Sjeffstatic inline unsigned long 39219820Sjeffroundup_pow_of_two(unsigned long x) 40219820Sjeff{ 41219820Sjeff return (1UL << flsl(x - 1)); 42219820Sjeff} 43219820Sjeff 44219820Sjeffstatic inline int 45219820Sjeffis_power_of_2(unsigned long n) 46219820Sjeff{ 47219820Sjeff return (n == roundup_pow_of_two(n)); 48219820Sjeff} 49219820Sjeff 50219820Sjeffstatic inline unsigned long 51219820Sjeffrounddown_pow_of_two(unsigned long x) 52219820Sjeff{ 53331756Semaste return (1UL << (flsl(x) - 1)); 54219820Sjeff} 55219820Sjeff 56289683Shselasky#define ilog2(n) \ 57255932Salfred( \ 58255932Salfred __builtin_constant_p(n) ? ( \ 59289683Shselasky (n) < 1 ? -1 : \ 60255932Salfred (n) & (1ULL << 63) ? 63 : \ 61255932Salfred (n) & (1ULL << 62) ? 62 : \ 62255932Salfred (n) & (1ULL << 61) ? 61 : \ 63255932Salfred (n) & (1ULL << 60) ? 60 : \ 64255932Salfred (n) & (1ULL << 59) ? 59 : \ 65255932Salfred (n) & (1ULL << 58) ? 58 : \ 66255932Salfred (n) & (1ULL << 57) ? 57 : \ 67255932Salfred (n) & (1ULL << 56) ? 56 : \ 68255932Salfred (n) & (1ULL << 55) ? 55 : \ 69255932Salfred (n) & (1ULL << 54) ? 54 : \ 70255932Salfred (n) & (1ULL << 53) ? 53 : \ 71255932Salfred (n) & (1ULL << 52) ? 52 : \ 72255932Salfred (n) & (1ULL << 51) ? 51 : \ 73255932Salfred (n) & (1ULL << 50) ? 50 : \ 74255932Salfred (n) & (1ULL << 49) ? 49 : \ 75255932Salfred (n) & (1ULL << 48) ? 48 : \ 76255932Salfred (n) & (1ULL << 47) ? 47 : \ 77255932Salfred (n) & (1ULL << 46) ? 46 : \ 78255932Salfred (n) & (1ULL << 45) ? 45 : \ 79255932Salfred (n) & (1ULL << 44) ? 44 : \ 80255932Salfred (n) & (1ULL << 43) ? 43 : \ 81255932Salfred (n) & (1ULL << 42) ? 42 : \ 82255932Salfred (n) & (1ULL << 41) ? 41 : \ 83255932Salfred (n) & (1ULL << 40) ? 40 : \ 84255932Salfred (n) & (1ULL << 39) ? 39 : \ 85255932Salfred (n) & (1ULL << 38) ? 38 : \ 86255932Salfred (n) & (1ULL << 37) ? 37 : \ 87255932Salfred (n) & (1ULL << 36) ? 36 : \ 88255932Salfred (n) & (1ULL << 35) ? 35 : \ 89255932Salfred (n) & (1ULL << 34) ? 34 : \ 90255932Salfred (n) & (1ULL << 33) ? 33 : \ 91255932Salfred (n) & (1ULL << 32) ? 32 : \ 92255932Salfred (n) & (1ULL << 31) ? 31 : \ 93255932Salfred (n) & (1ULL << 30) ? 30 : \ 94255932Salfred (n) & (1ULL << 29) ? 29 : \ 95255932Salfred (n) & (1ULL << 28) ? 28 : \ 96255932Salfred (n) & (1ULL << 27) ? 27 : \ 97255932Salfred (n) & (1ULL << 26) ? 26 : \ 98255932Salfred (n) & (1ULL << 25) ? 25 : \ 99255932Salfred (n) & (1ULL << 24) ? 24 : \ 100255932Salfred (n) & (1ULL << 23) ? 23 : \ 101255932Salfred (n) & (1ULL << 22) ? 22 : \ 102255932Salfred (n) & (1ULL << 21) ? 21 : \ 103255932Salfred (n) & (1ULL << 20) ? 20 : \ 104255932Salfred (n) & (1ULL << 19) ? 19 : \ 105255932Salfred (n) & (1ULL << 18) ? 18 : \ 106255932Salfred (n) & (1ULL << 17) ? 17 : \ 107255932Salfred (n) & (1ULL << 16) ? 16 : \ 108255932Salfred (n) & (1ULL << 15) ? 15 : \ 109255932Salfred (n) & (1ULL << 14) ? 14 : \ 110255932Salfred (n) & (1ULL << 13) ? 13 : \ 111255932Salfred (n) & (1ULL << 12) ? 12 : \ 112255932Salfred (n) & (1ULL << 11) ? 11 : \ 113255932Salfred (n) & (1ULL << 10) ? 10 : \ 114255932Salfred (n) & (1ULL << 9) ? 9 : \ 115255932Salfred (n) & (1ULL << 8) ? 8 : \ 116255932Salfred (n) & (1ULL << 7) ? 7 : \ 117255932Salfred (n) & (1ULL << 6) ? 6 : \ 118255932Salfred (n) & (1ULL << 5) ? 5 : \ 119255932Salfred (n) & (1ULL << 4) ? 4 : \ 120255932Salfred (n) & (1ULL << 3) ? 3 : \ 121255932Salfred (n) & (1ULL << 2) ? 2 : \ 122255932Salfred (n) & (1ULL << 1) ? 1 : \ 123255932Salfred (n) & (1ULL << 0) ? 0 : \ 124289683Shselasky -1) : \ 125255932Salfred (sizeof(n) <= 4) ? \ 126289683Shselasky fls((u32)(n)) - 1 : flsll((u64)(n)) - 1 \ 127289683Shselasky) 128255932Salfred 129279205Shselasky#define order_base_2(x) ilog2(roundup_pow_of_two(x)) 130279205Shselasky 131219820Sjeff#endif /* _LINUX_LOG2_H_ */ 132