param.h (9948B) - Raw
1 /* 2 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28 /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */ 29 /*- 30 * Copyright (c) 1982, 1986, 1989, 1993 31 * The Regents of the University of California. All rights reserved. 32 * (c) UNIX System Laboratories, Inc. 33 * All or some portions of this file are derived from material licensed 34 * to the University of California by American Telephone and Telegraph 35 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 36 * the permission of UNIX System Laboratories, Inc. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)param.h 8.3 (Berkeley) 4/4/95 67 */ 68 69 #ifndef _SYS_PARAM_H_ 70 #define _SYS_PARAM_H_ 71 72 #define BSD 199506 /* System version (year & month). */ 73 #define BSD4_3 1 74 #define BSD4_4 1 75 76 #define NeXTBSD 1995064 /* NeXTBSD version (year, month, release) */ 77 #define NeXTBSD4_0 0 /* NeXTBSD 4.0 */ 78 79 #include <sys/_types.h> 80 #include <sys/_types/_null.h> 81 82 #ifndef LOCORE 83 #include <sys/types.h> 84 #endif 85 86 /* 87 * Machine-independent constants (some used in following include files). 88 * Redefined constants are from POSIX 1003.1 limits file. 89 * 90 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 91 * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>) 92 */ 93 #include <sys/syslimits.h> 94 95 #define MAXCOMLEN 16 /* max command name remembered */ 96 #define MAXINTERP 64 /* max interpreter file name length */ 97 #define MAXLOGNAME 255 /* max login name length */ 98 #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 99 #define NCARGS ARG_MAX /* max bytes for an exec function */ 100 #define NGROUPS NGROUPS_MAX /* max number groups */ 101 #define NOFILE 256 /* default max open files per process */ 102 #define NOGROUP 65535 /* marker for empty group set member */ 103 #define MAXHOSTNAMELEN 256 /* max hostname size */ 104 #define MAXDOMNAMELEN 256 /* maximum domain name length */ 105 106 /* Machine type dependent parameters. */ 107 #include <machine/param.h> 108 109 /* More types and definitions used throughout the kernel. */ 110 #include <limits.h> 111 112 /* Signals. */ 113 #include <sys/signal.h> 114 115 /* 116 * Priorities. Note that with 32 run queues, differences less than 4 are 117 * insignificant. 118 */ 119 #define PSWP 0 120 #define PVM 4 121 #define PINOD 8 122 #define PRIBIO 16 123 #define PVFS 20 124 #define PZERO 22 /* No longer magic, shouldn't be here. XXX */ 125 #define PSOCK 24 126 #define PWAIT 32 127 #define PLOCK 36 128 #define PPAUSE 40 129 #define PUSER 50 130 #define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */ 131 132 #define PRIMASK 0x0ff 133 #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 134 #define PTTYBLOCK 0x200 /* for tty SIGTTOU and SIGTTIN blocking */ 135 #define PDROP 0x400 /* OR'd with pri to stop re-aquistion of mutex upon wakeup */ 136 #define PSPIN 0x800 /* OR'd with pri to require mutex in spin mode upon wakeup */ 137 138 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 139 140 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 141 #define NODEV (dev_t)(-1) /* non-existent device */ 142 143 /* 144 * Clustering of hardware pages on machines with ridiculously small 145 * page sizes is done here. The paging subsystem deals with units of 146 * CLSIZE pte's describing NBPG (from machine/param.h) pages each. 147 */ 148 #define CLBYTES (CLSIZE*NBPG) 149 #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */ 150 #define claligned(x) ((((int)(x))&CLOFSET)==0) 151 #define CLOFF CLOFSET 152 #define CLSHIFT (PGSHIFT+CLSIZELOG2) 153 154 #if CLSIZE == 1 155 #define clbase(i) (i) 156 #define clrnd(i) (i) 157 #else 158 /* Give the base virtual address (first of CLSIZE). */ 159 #define clbase(i) ((i) &~ (CLSIZE-1)) 160 /* Round a number of clicks up to a whole cluster. */ 161 #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1)) 162 #endif 163 164 #define CBLOCK 64 /* Clist block size, must be a power of 2. */ 165 #define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */ 166 /* Data chars/clist. */ 167 #define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE) 168 #define CROUND (CBLOCK - 1) /* Clist rounding. */ 169 170 /* 171 * File system parameters and macros. 172 * 173 * The file system is made out of blocks of at most MAXPHYS units, with 174 * smaller units (fragments) only in the last direct block. MAXBSIZE 175 * primarily determines the size of buffers in the buffer pool. It may be 176 * made larger than MAXPHYS without any effect on existing file systems; 177 * however making it smaller may make some file systems unmountable. 178 * We set this to track the value of MAX_UPL_TRANSFER_BYTES from 179 * osfmk/mach/memory_object_types.h to bound it at the maximum UPL size. 180 */ 181 #define MAXBSIZE (256 * 4096) 182 #define MAXPHYSIO MAXPHYS 183 #define MAXFRAG 8 184 185 #define MAXPHYSIO_WIRED (16 * 1024 * 1024) 186 187 /* 188 * MAXPATHLEN defines the longest permissable path length after expanding 189 * symbolic links. It is used to allocate a temporary buffer from the buffer 190 * pool in which to do the name expansion, hence should be a power of two, 191 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 192 * maximum number of symbolic links that may be expanded in a path name. 193 * It should be set high enough to allow all legitimate uses, but halt 194 * infinite loops reasonably quickly. 195 */ 196 #define MAXPATHLEN PATH_MAX 197 #define MAXSYMLINKS 32 198 199 /* Bit map related macros. */ 200 #define setbit(a, i) (((unsigned char *)(a))[(i)/NBBY] |= 1u<<((i)%NBBY)) 201 #define clrbit(a, i) (((unsigned char *)(a))[(i)/NBBY] &= ~(1u<<((i)%NBBY))) 202 #define isset(a, i) (((unsigned char *)(a))[(i)/NBBY] & (1u<<((i)%NBBY))) 203 #define isclr(a, i) ((((unsigned char *)(a))[(i)/NBBY] & (1u<<((i)%NBBY))) == 0) 204 205 /* Macros for counting, rounding. */ 206 #ifndef howmany 207 #define howmany(x, y) ((((x) % (y)) == 0) ? ((x) / (y)) : (((x) / (y)) + 1)) 208 #endif 209 #define roundup(x, y) ((((x) % (y)) == 0) ? \ 210 (x) : ((x) + ((y) - ((x) % (y))))) 211 #define powerof2(x) ((((x)-1)&(x))==0) 212 213 /* Macros for min/max. */ 214 #ifndef MIN 215 #define MIN(a, b) (((a)<(b))?(a):(b)) 216 #endif /* MIN */ 217 #ifndef MAX 218 #define MAX(a, b) (((a)>(b))?(a):(b)) 219 #endif /* MAX */ 220 221 /* 222 * Scale factor for scaled integers used to count %cpu time and load avgs. 223 * 224 * The number of CPU `tick's that map to a unique `%age' can be expressed 225 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 226 * can be calculated (assuming 32 bits) can be closely approximated using 227 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 228 * 229 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 230 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 231 */ 232 #define FSHIFT 11 /* bits to right of fixed binary point */ 233 #define FSCALE (1<<FSHIFT) 234 235 #endif /* _SYS_PARAM_H_ */