19ae9ad29Sbostic /*- 283adbb3cSbostic * Copyright (c) 1982, 1986, 1989, 1993 383adbb3cSbostic * The Regents of the University of California. All rights reserved. 460749750Sbostic * (c) UNIX System Laboratories, Inc. 560749750Sbostic * All or some portions of this file are derived from material licensed 660749750Sbostic * to the University of California by American Telephone and Telegraph 760749750Sbostic * Co. or Unix System Laboratories, Inc. and are reproduced herein with 860749750Sbostic * the permission of UNIX System Laboratories, Inc. 965a1cfb1Smckusick * 109ae9ad29Sbostic * %sccs.include.redist.c% 119ae9ad29Sbostic * 12*ab9556f9Smckusick * @(#)param.h 8.3 (Berkeley) 04/04/95 1365a1cfb1Smckusick */ 145db792e4Sbill 15*ab9556f9Smckusick #define BSD 199506 /* System version (year & month). */ 161a9e6e3cSkarels #define BSD4_3 1 1750ed812dSbostic #define BSD4_4 1 182867d692Sbloom 199ae9ad29Sbostic #ifndef NULL 209ae9ad29Sbostic #define NULL 0 219ae9ad29Sbostic #endif 224a9959f4Sbostic 231ba81c5bSkarels #ifndef LOCORE 241ba81c5bSkarels #include <sys/types.h> 251ba81c5bSkarels #endif 261ba81c5bSkarels 275db792e4Sbill /* 289ae9ad29Sbostic * Machine-independent constants (some used in following include files). 299ae9ad29Sbostic * Redefined constants are from POSIX 1003.1 limits file. 309ae9ad29Sbostic * 319ae9ad29Sbostic * MAXCOMLEN should be >= sizeof(ac_comm) (see <acct.h>) 329ae9ad29Sbostic * MAXLOGNAME should be >= UT_NAMESIZE (see <utmp.h>) 33b481cdefSroot */ 349ae9ad29Sbostic #include <sys/syslimits.h> 359ae9ad29Sbostic 369ae9ad29Sbostic #define MAXCOMLEN 16 /* max command name remembered */ 3757ce53b7Skarels #define MAXINTERP 32 /* max interpreter file name length */ 389ae9ad29Sbostic #define MAXLOGNAME 12 /* max login name length */ 399ae9ad29Sbostic #define MAXUPRC CHILD_MAX /* max simultaneous processes */ 409ae9ad29Sbostic #define NCARGS ARG_MAX /* max bytes for an exec function */ 414a9959f4Sbostic #define NGROUPS NGROUPS_MAX /* max number groups */ 429ae9ad29Sbostic #define NOFILE OPEN_MAX /* max open files per process */ 43ebd4ffb8Skarels #define NOGROUP 65535 /* marker for empty group set member */ 449ae9ad29Sbostic #define MAXHOSTNAMELEN 256 /* max hostname size */ 45e74c57f3Ssam 469ae9ad29Sbostic /* More types and definitions used throughout the kernel. */ 47f34b934bSkarels #ifdef KERNEL 48f34b934bSkarels #include <sys/cdefs.h> 49f34b934bSkarels #include <sys/errno.h> 50f34b934bSkarels #include <sys/time.h> 51f34b934bSkarels #include <sys/resource.h> 52f34b934bSkarels #include <sys/ucred.h> 53f34b934bSkarels #include <sys/uio.h> 54f34b934bSkarels #endif 55f34b934bSkarels 569ae9ad29Sbostic /* Signals. */ 570c67d176Skarels #include <sys/signal.h> 5803c2128fSroot 599ae9ad29Sbostic /* Machine type dependent parameters. */ 6064716fc5Sbostic #include <machine/param.h> 6164716fc5Sbostic #include <machine/limits.h> 62f520e942Skarels 631ba81c5bSkarels /* 649ae9ad29Sbostic * Priorities. Note that with 32 run queues, differences less than 4 are 659ae9ad29Sbostic * insignificant. 661ba81c5bSkarels */ 671ba81c5bSkarels #define PSWP 0 681ba81c5bSkarels #define PVM 4 691ba81c5bSkarels #define PINOD 8 701ba81c5bSkarels #define PRIBIO 16 711ba81c5bSkarels #define PVFS 20 721041662dSkarels #define PZERO 22 /* No longer magic, shouldn't be here. XXX */ 731ba81c5bSkarels #define PSOCK 24 741ba81c5bSkarels #define PWAIT 32 751ba81c5bSkarels #define PLOCK 36 761ba81c5bSkarels #define PPAUSE 40 771ba81c5bSkarels #define PUSER 50 789ae9ad29Sbostic #define MAXPRI 127 /* Priorities range from 0 through MAXPRI. */ 791ba81c5bSkarels 801ba81c5bSkarels #define PRIMASK 0x0ff 819ae9ad29Sbostic #define PCATCH 0x100 /* OR'd with pri for tsleep to check signals */ 821ba81c5bSkarels 831ba81c5bSkarels #define NZERO 0 /* default "nice" */ 841ba81c5bSkarels 859ae9ad29Sbostic #define NBPW sizeof(int) /* number of bytes per word (integer) */ 865db792e4Sbill 879ae9ad29Sbostic #define CMASK 022 /* default file mask: S_IWGRP|S_IWOTH */ 889ae9ad29Sbostic #define NODEV (dev_t)(-1) /* non-existent device */ 895db792e4Sbill 905db792e4Sbill /* 915db792e4Sbill * Clustering of hardware pages on machines with ridiculously small 925db792e4Sbill * page sizes is done here. The paging subsystem deals with units of 93f520e942Skarels * CLSIZE pte's describing NBPG (from machine/machparam.h) pages each. 945db792e4Sbill */ 95248881f8Swnj #define CLBYTES (CLSIZE*NBPG) 96e163c03cSwnj #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */ 97248881f8Swnj #define claligned(x) ((((int)(x))&CLOFSET)==0) 98248881f8Swnj #define CLOFF CLOFSET 99b481cdefSroot #define CLSHIFT (PGSHIFT+CLSIZELOG2) 1005db792e4Sbill 101b481cdefSroot #if CLSIZE==1 102b481cdefSroot #define clbase(i) (i) 103b481cdefSroot #define clrnd(i) (i) 104b481cdefSroot #else 1059ae9ad29Sbostic /* Give the base virtual address (first of CLSIZE). */ 1065db792e4Sbill #define clbase(i) ((i) &~ (CLSIZE-1)) 1079ae9ad29Sbostic /* Round a number of clicks up to a whole cluster. */ 1085db792e4Sbill #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1)) 109b481cdefSroot #endif 1105db792e4Sbill 1119ae9ad29Sbostic #define CBLOCK 64 /* Clist block size, must be a power of 2. */ 1129ae9ad29Sbostic #define CBQSIZE (CBLOCK/NBBY) /* Quote bytes/cblock - can do better. */ 1139ae9ad29Sbostic /* Data chars/clist. */ 1149ae9ad29Sbostic #define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE) 1159ae9ad29Sbostic #define CROUND (CBLOCK - 1) /* Clist rounding. */ 1165db792e4Sbill 1175db792e4Sbill /* 118389af1dfSmckusic * File system parameters and macros. 119389af1dfSmckusic * 1209ae9ad29Sbostic * The file system is made out of blocks of at most MAXBSIZE units, with 1219ae9ad29Sbostic * smaller units (fragments) only in the last direct block. MAXBSIZE 1229ae9ad29Sbostic * primarily determines the size of buffers in the buffer pool. It may be 1239ae9ad29Sbostic * made larger without any effect on existing file systems; however making 1249ae9ad29Sbostic * it smaller make make some file systems unmountable. 125389af1dfSmckusic */ 1269433929dSmargo #define MAXBSIZE MAXPHYS 127389af1dfSmckusic #define MAXFRAG 8 128389af1dfSmckusic 129edc472f6Skre /* 1309ae9ad29Sbostic * MAXPATHLEN defines the longest permissable path length after expanding 1319ae9ad29Sbostic * symbolic links. It is used to allocate a temporary buffer from the buffer 1329ae9ad29Sbostic * pool in which to do the name expansion, hence should be a power of two, 1339ae9ad29Sbostic * and must be less than or equal to MAXBSIZE. MAXSYMLINKS defines the 1349ae9ad29Sbostic * maximum number of symbolic links that may be expanded in a path name. 1359ae9ad29Sbostic * It should be set high enough to allow all legitimate uses, but halt 1369ae9ad29Sbostic * infinite loops reasonably quickly. 137389af1dfSmckusic */ 1384a9959f4Sbostic #define MAXPATHLEN PATH_MAX 139389af1dfSmckusic #define MAXSYMLINKS 8 140389af1dfSmckusic 1419ae9ad29Sbostic /* Bit map related macros. */ 142ab090aa7Skarels #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 143ab090aa7Skarels #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 144ab090aa7Skarels #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 145ab090aa7Skarels #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 146ab090aa7Skarels 1479ae9ad29Sbostic /* Macros for counting and rounding. */ 148ab090aa7Skarels #ifndef howmany 149ab090aa7Skarels #define howmany(x, y) (((x)+((y)-1))/(y)) 150ab090aa7Skarels #endif 151ab090aa7Skarels #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 152ab090aa7Skarels #define powerof2(x) ((((x)-1)&(x))==0) 153ab090aa7Skarels 15403a7e507Sbostic /* Macros for min/max. */ 15503a7e507Sbostic #ifndef KERNEL 156ab090aa7Skarels #define MIN(a,b) (((a)<(b))?(a):(b)) 157ab090aa7Skarels #define MAX(a,b) (((a)>(b))?(a):(b)) 158ab090aa7Skarels #endif 159ab090aa7Skarels 160ab090aa7Skarels /* 1612fe64d92Smckusick * Constants for setting the parameters of the kernel memory allocator. 1622fe64d92Smckusick * 1632fe64d92Smckusick * 2 ** MINBUCKET is the smallest unit of memory that will be 1642fe64d92Smckusick * allocated. It must be at least large enough to hold a pointer. 1652fe64d92Smckusick * 1662fe64d92Smckusick * Units of memory less or equal to MAXALLOCSAVE will permanently 1672fe64d92Smckusick * allocate physical memory; requests for these size pieces of 1682fe64d92Smckusick * memory are quite fast. Allocations greater than MAXALLOCSAVE must 1692fe64d92Smckusick * always allocate and free physical memory; requests for these 1702fe64d92Smckusick * size allocations should be done infrequently as they will be slow. 1719ae9ad29Sbostic * 1729ae9ad29Sbostic * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14), and 1739ae9ad29Sbostic * MAXALLOCSIZE must be a power of two. 1742fe64d92Smckusick */ 1752fe64d92Smckusick #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 1762fe64d92Smckusick #define MAXALLOCSAVE (2 * CLBYTES) 1772fe64d92Smckusick 1782fe64d92Smckusick /* 1794233ee38Smckusick * Scale factor for scaled integers used to count %cpu time and load avgs. 1804233ee38Smckusick * 1814233ee38Smckusick * The number of CPU `tick's that map to a unique `%age' can be expressed 1824233ee38Smckusick * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 1834233ee38Smckusick * can be calculated (assuming 32 bits) can be closely approximated using 1844233ee38Smckusick * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 1854233ee38Smckusick * 1864233ee38Smckusick * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 1874233ee38Smckusick * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 1884233ee38Smckusick */ 1894233ee38Smckusick #define FSHIFT 11 /* bits to right of fixed binary point */ 1904233ee38Smckusick #define FSCALE (1<<FSHIFT) 191