1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1993 3 * The Regents of the University of California. All rights reserved. 4 * (c) UNIX System Laboratories, Inc. 5 * All or some portions of this file are derived from material licensed 6 * to the University of California by American Telephone and Telegraph 7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 8 * the permission of UNIX System Laboratories, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)param.h 8.3 (Berkeley) 4/4/95 35 * $FreeBSD: releng/10.1/sys/sys/param.h 272463 2014-10-03 00:58:34Z gjb $ 36 */ 37 38 #ifndef _SYS_PARAM_H_ 39 #define _SYS_PARAM_H_ 40 41 #define NBBY 8 /* number of bits in a byte */ 42 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 43 44 /* Bit map related macros. */ 45 #define setbit(a,i) (((unsigned char *)(a))[(i)/NBBY] |= 1<<((i)%NBBY)) 46 #define clrbit(a,i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1<<((i)%NBBY))) 47 #define isset(a,i) \ 48 (((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) 49 #define isclr(a,i) \ 50 ((((const unsigned char *)(a))[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 51 52 /* Macros for counting and rounding. */ 53 #ifndef howmany 54 #define howmany(x, y) (((x)+((y)-1))/(y)) 55 #endif 56 #define nitems(x) (sizeof((x)) / sizeof((x)[0])) 57 #define rounddown(x, y) (((x)/(y))*(y)) 58 #define rounddown2(x, y) ((x)&(~((y)-1))) /* if y is power of two */ 59 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) /* to any y */ 60 #define roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) /* if y is powers of two */ 61 #define powerof2(x) ((((x)-1)&(x))==0) 62 63 /* Macros for min/max. */ 64 #define MIN(a,b) (((a)<(b))?(a):(b)) 65 #define MAX(a,b) (((a)>(b))?(a):(b)) 66 #define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 67 68 #define ct_assert(e) extern char (*ct_assert(void)) [sizeof(char[1 - 2*!(e)])] 69 70 71 #define do_div(n,base) ({ \ 72 unsigned int __base = (base); \ 73 unsigned int __rem; \ 74 __rem = ((u64)(n)) % __base; \ 75 (n) = ((u64)(n)) / __base; \ 76 __rem; \ 77 }) 78 79 80 #endif /* _SYS_PARAM_H_ */ 81