1 /* $NetBSD: param.h,v 1.244.2.9.2.2 2008/10/05 08:44:03 bouyer Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)param.h 8.3 (Berkeley) 4/4/95 37 */ 38 39 #ifndef _SYS_PARAM_H_ 40 #define _SYS_PARAM_H_ 41 42 /* 43 * Historic BSD #defines -- probably will remain untouched for all time. 44 */ 45 #define BSD 199506 /* System version (year & month). */ 46 #define BSD4_3 1 47 #define BSD4_4 1 48 49 /* 50 * #define __NetBSD_Version__ MMmmrrpp00 51 * 52 * M = major version 53 * m = minor version; a minor number of 99 indicates current. 54 * r = 0 (*) 55 * p = patchlevel 56 * 57 * When new releases are made, src/gnu/usr.bin/groff/tmac/mdoc.local 58 * needs to be updated and the changes sent back to the groff maintainers. 59 * 60 * (*) Up to 2.0I "release" used to be "",A-Z,Z[A-Z] but numeric 61 * e.g. NetBSD-1.2D = 102040000 ('D' == 4) 62 * NetBSD-2.0H (200080000) was changed on 20041001 to: 63 * 2.99.9 (299000900) 64 */ 65 66 #define __NetBSD_Version__ 400000003 /* NetBSD 4.0.1 */ 67 68 #define __NetBSD_Prereq__(M,m,p) (((((M) * 100000000) + \ 69 (m) * 1000000) + (p) * 100) <= __NetBSD_Version__) 70 71 /* 72 * Historical NetBSD #define 73 * 74 * NetBSD 1.4 was the last release for which this value was incremented. 75 * The value is now permanently fixed at 199905. It will never be 76 * changed again. 77 * 78 * New code must use __NetBSD_Version__ instead, and should not even 79 * count on NetBSD being defined. 80 * 81 */ 82 83 #define NetBSD 199905 /* NetBSD version (year & month). */ 84 85 #ifndef _LOCORE 86 //#include <sys/inttypes.h> 87 #include <sys/types.h> 88 #endif 89 90 /* 91 * Machine-independent constants (some used in following include files). 92 * Redefined constants are from POSIX 1003.1 limits file. 93 * 94 * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 95 * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>) 96 */ 97 #include <sys/syslimits.h> 98 99 #define MAXCOMLEN 16 /* max command name remembered */ 100 #define MAXINTERP PATH_MAX /* max interpreter file name length */ 101 /* DEPRECATED: use LOGIN_NAME_MAX instead. */ 102 #define MAXLOGNAME (LOGIN_NAME_MAX - 1) /* max login name length */ 103 #define NCARGS ARG_MAX /* max bytes for an exec function */ 104 #define NGROUPS NGROUPS_MAX /* max number groups */ 105 #define NOGROUP 65535 /* marker for empty group set member */ 106 #define MAXHOSTNAMELEN 256 /* max hostname size */ 107 108 #ifndef NOFILE 109 #define NOFILE OPEN_MAX /* max open files per process */ 110 #endif 111 #ifndef MAXUPRC /* max simultaneous processes */ 112 #define MAXUPRC CHILD_MAX /* POSIX 1003.1-compliant default */ 113 #else 114 #if (MAXUPRC - 0) < CHILD_MAX 115 #error MAXUPRC less than CHILD_MAX. See options(4) for details. 116 #endif /* (MAXUPRC - 0) < CHILD_MAX */ 117 #endif /* !defined(MAXUPRC) */ 118 119 /* Signals. */ 120 #include <sys/signal.h> 121 122 /* Machine type dependent parameters. */ 123 #include <machine/param.h> 124 #include <machine/limits.h> 125 126 /* pages ("clicks") to disk blocks */ 127 #define ctod(x) ((x) << (PGSHIFT - DEV_BSHIFT)) 128 #define dtoc(x) ((x) >> (PGSHIFT - DEV_BSHIFT)) 129 130 /* bytes to pages */ 131 #define ctob(x) ((x) << PGSHIFT) 132 #define btoc(x) (((x) + PGOFSET) >> PGSHIFT) 133 134 /* bytes to disk blocks */ 135 #define dbtob(x) ((x) << DEV_BSHIFT) 136 #define btodb(x) ((x) >> DEV_BSHIFT) 137 138 /* 139 * Stack macros. On most architectures, the stack grows down, 140 * towards lower addresses; it is the rare architecture where 141 * it grows up, towards higher addresses. 142 * 143 * STACK_GROW and STACK_SHRINK adjust a stack pointer by some 144 * size, no questions asked. STACK_ALIGN aligns a stack pointer. 145 * 146 * STACK_ALLOC returns a pointer to allocated stack space of 147 * some size; given such a pointer and a size, STACK_MAX gives 148 * the maximum (in the "maxsaddr" sense) stack address of the 149 * allocated memory. 150 */ 151 #if defined(_KERNEL) || defined(__EXPOSE_STACK) 152 #ifdef __MACHINE_STACK_GROWS_UP 153 #define STACK_GROW(sp, _size) (((caddr_t)(sp)) + (_size)) 154 #define STACK_SHRINK(sp, _size) (((caddr_t)(sp)) - (_size)) 155 #define STACK_ALIGN(sp, bytes) \ 156 ((caddr_t)((((unsigned long)(sp)) + (bytes)) & ~(bytes))) 157 #define STACK_ALLOC(sp, _size) ((caddr_t)(sp)) 158 #define STACK_MAX(p, _size) (((caddr_t)(p)) + (_size)) 159 #else 160 #define STACK_GROW(sp, _size) (((caddr_t)(sp)) - (_size)) 161 #define STACK_SHRINK(sp, _size) (((caddr_t)(sp)) + (_size)) 162 #define STACK_ALIGN(sp, bytes) \ 163 ((caddr_t)(((unsigned long)(sp)) & ~(bytes))) 164 #define STACK_ALLOC(sp, _size) (((caddr_t)(sp)) - (_size)) 165 #define STACK_MAX(p, _size) ((caddr_t)(p)) 166 #endif 167 #endif /* defined(_KERNEL) || defined(__EXPOSE_STACK) */ 168 169 /* 170 * Priorities. Note that with 32 run queues, differences less than 4 are 171 * insignificant. 172 */ 173 #define PSWP 0 174 #define PVM 4 175 #define PINOD 8 176 #define PRIBIO 16 177 #define PVFS 20 178 #define PZERO 22 /* No longer magic, shouldn't be here. XXX */ 179 #define PSOCK 24 180 #define PWAIT 32 181 #define PLOCK 36 182 #define PPAUSE 40 183 #define PUSER 50 184 #define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */ 185 186 #define PRIMASK 0x0ff 187 #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 188 #define PNORELOCK 0x200 /* OR'd with pri for cond_wait() to not relock 189 the interlock */ 190 #define PNOEXITERR 0x400 /* OR'd with pri for tsleep to not exit 191 with an error code when LWPs are exiting */ 192 #define NBPW sizeof(int) /* number of bytes per word (integer) */ 193 194 #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 195 #define NODEV (dev_t)(-1) /* non-existent device */ 196 197 #define CBLOCK 64 /* Clist block size, must be a power of 2. */ 198 #define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */ 199 /* Data chars/clist. */ 200 #define CBSIZE (CBLOCK - (int)sizeof(struct cblock *) - CBQSIZE) 201 #define CROUND (CBLOCK - 1) /* Clist rounding. */ 202 203 /* 204 * File system parameters and macros. 205 * 206 * The file system is made out of blocks of at most MAXBSIZE units, with 207 * smaller units (fragments) only in the last direct block. MAXBSIZE 208 * primarily determines the size of buffers in the buffer pool. It may be 209 * made larger without any effect on existing file systems; however making 210 * it smaller may make some file systems unmountable. 211 */ 212 #ifndef MAXBSIZE /* XXX */ 213 #define MAXBSIZE MAXPHYS 214 #endif 215 #define MAXFRAG 8 216 217 /* 218 * MAXPATHLEN defines the longest permissible path length after expanding 219 * symbolic links. It is used to allocate a temporary buffer from the buffer 220 * pool in which to do the name expansion, hence should be a power of two, 221 * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 222 * maximum number of symbolic links that may be expanded in a path name. 223 * It should be set high enough to allow all legitimate uses, but halt 224 * infinite loops reasonably quickly. 225 */ 226 #define MAXPATHLEN PATH_MAX 227 #define MAXSYMLINKS 32 228 229 /* Bit map related macros. */ 230 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 231 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 232 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 233 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 234 235 /* Macros for counting and rounding. */ 236 #ifndef howmany 237 #define howmany(x, y) (((x)+((y)-1))/(y)) 238 #endif 239 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 240 #define rounddown(x,y) (((x)/(y))*(y)) 241 #define powerof2(x) ((((x)-1)&(x))==0) 242 243 ///* Macros for min/max. */ 244 //#define MIN(a,b) (((a)<(b))?(a):(b)) 245 //#define MAX(a,b) (((a)>(b))?(a):(b)) 246 247 /* 248 * Constants for setting the parameters of the kernel memory allocator. 249 * 250 * 2 ** MINBUCKET is the smallest unit of memory that will be 251 * allocated. It must be at least large enough to hold a pointer. 252 * 253 * Units of memory less or equal to MAXALLOCSAVE will permanently 254 * allocate physical memory; requests for these size pieces of 255 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 256 * always allocate and free physical memory; requests for these 257 * size allocations should be done infrequently as they will be slow. 258 * 259 * Constraints: NBPG <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 260 * MAXALLOCSAVE must be a power of two. 261 */ 262 #ifdef _LP64 263 #define MINBUCKET 5 /* 5 => min allocation of 32 bytes */ 264 #else 265 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 266 #endif 267 #define MAXALLOCSAVE (2 * NBPG) 268 269 /* 270 * Scale factor for scaled integers used to count %cpu time and load avgs. 271 * 272 * The number of CPU `tick's that map to a unique `%age' can be expressed 273 * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 274 * can be calculated (assuming 32 bits) can be closely approximated using 275 * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 276 * 277 * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 278 * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 279 */ 280 #define FSHIFT 11 /* bits to right of fixed binary point */ 281 #define FSCALE (1<<FSHIFT) 282 283 /* 284 * The time for a process to be blocked before being very swappable. 285 * This is a number of seconds which the system takes as being a non-trivial 286 * amount of real time. You probably shouldn't change this; 287 * it is used in subtle ways (fractions and multiples of it are, that is, like 288 * half of a ``long time'', almost a long time, etc.) 289 * It is related to human patience and other factors which don't really 290 * change over time. 291 */ 292 #define MAXSLP 20 293 294 /* 295 * Defaults for Unified Buffer Cache parameters. 296 * These may be overridden in <machine/param.h>. 297 */ 298 299 #ifndef UBC_WINSHIFT 300 #define UBC_WINSHIFT 13 301 #endif 302 #ifndef UBC_NWINS 303 #define UBC_NWINS 1024 304 #endif 305 306 #ifdef _KERNEL 307 /* 308 * macro to convert from milliseconds to hz without integer overflow 309 * Default version using only 32bits arithmetics. 310 * 64bit port can define 64bit version in their <machine/param.h> 311 * 0x20000 is safe for hz < 20000 312 */ 313 #ifndef mstohz 314 #define mstohz(ms) \ 315 (__predict_false((ms) >= 0x20000) ? \ 316 ((ms +0u) / 1000u) * hz : \ 317 ((ms +0u) * hz) / 1000u) 318 #endif 319 #endif /* _KERNEL */ 320 321 #endif /* !_SYS_PARAM_H_ */ 322