165a1cfb1Smckusick /* 2*0c67d176Skarels * Copyright (c) 1982, 1986, 1989 Regents of the University of California. 365a1cfb1Smckusick * All rights reserved. The Berkeley software License Agreement 465a1cfb1Smckusick * specifies the terms and conditions for redistribution. 565a1cfb1Smckusick * 6*0c67d176Skarels * @(#)param.h 7.11 (Berkeley) 08/26/89 765a1cfb1Smckusick */ 85db792e4Sbill 9*0c67d176Skarels #define BSD 198908 /* system version (year & month) */ 101a9e6e3cSkarels #define BSD4_3 1 112867d692Sbloom 124a9959f4Sbostic #include <sys/syslimits.h> 134a9959f4Sbostic 145db792e4Sbill /* 15b481cdefSroot * Machine-independent constants 16b481cdefSroot */ 1774c6c69bSkarels #define NMOUNT 20 /* number of mountable file systems */ 18f0028148Skarels /* NMOUNT must be <= 255 unless c_mdev (cmap.h) is expanded */ 19818d21a2Skarels #define MSWAPX NMOUNT /* pseudo mount table index for swapdev */ 204a9959f4Sbostic #define MAXUPRC CHILD_MAX /* max processes per user */ 214a9959f4Sbostic #define NOFILE OPEN_MAX /* max open files per process */ 225db792e4Sbill #define CANBSIZ 256 /* max size of typewriter line */ 234a9959f4Sbostic #define NCARGS ARG_MAX /* # characters in exec arglist */ 24aeeef3fcSbostic #define MAXINTERP 32 /* maximum interpreter file name length */ 254a9959f4Sbostic #define NGROUPS NGROUPS_MAX /* max number groups */ 26f520e942Skarels #define MAXHOSTNAMELEN 64 /* maximum hostname size */ 2745ac661dSwnj 28ebd4ffb8Skarels #define NOGROUP 65535 /* marker for empty group set member */ 29e74c57f3Ssam 305db792e4Sbill /* 31b481cdefSroot * Priorities 325db792e4Sbill */ 335db792e4Sbill #define PSWP 0 345db792e4Sbill #define PINOD 10 355db792e4Sbill #define PRIBIO 20 36c9c63310Smckusick #define PVFS 22 375db792e4Sbill #define PRIUBA 24 385db792e4Sbill #define PZERO 25 395db792e4Sbill #define PPIPE 26 405db792e4Sbill #define PWAIT 30 41bea46c20Ssam #define PLOCK 35 425db792e4Sbill #define PSLEP 40 435db792e4Sbill #define PUSER 50 445db792e4Sbill 4574c6c69bSkarels #define NZERO 0 465db792e4Sbill 47f520e942Skarels #ifndef KERNEL 48f520e942Skarels #include <sys/types.h> 49f520e942Skarels #else 50f520e942Skarels #ifndef LOCORE 51f520e942Skarels #include "types.h" 52f520e942Skarels #endif 53f520e942Skarels #endif 54f520e942Skarels 555db792e4Sbill /* 56b481cdefSroot * Signals 575db792e4Sbill */ 58586761c3Ssam #ifdef KERNEL 5964691dc4Sbloom #include "signal.h" 60c6983186Sbill 61586761c3Ssam #define ISSIG(p) \ 62*0c67d176Skarels ((p)->p_sig && \ 63*0c67d176Skarels ((p)->p_flag&STRC || ((p)->p_sig &~ (p)->p_sigmask)) && issig()) 64*0c67d176Skarels 65*0c67d176Skarels #else 66*0c67d176Skarels #include <sys/signal.h> 67*0c67d176Skarels #endif 6803c2128fSroot 69f520e942Skarels /* 70f520e942Skarels * Machine type dependent parameters. 71f520e942Skarels */ 72f520e942Skarels #ifdef KERNEL 7393571777Smckusick #include "machine/machparam.h" 74f520e942Skarels #else 75f520e942Skarels #include <machine/machparam.h> 76f520e942Skarels #endif 77f520e942Skarels 785db792e4Sbill #define NBPW sizeof(int) /* number of bytes in an integer */ 795db792e4Sbill 80*0c67d176Skarels #ifndef NULL 815db792e4Sbill #define NULL 0 82*0c67d176Skarels #endif 83f0028148Skarels #define CMASK 022 /* default mask for file creation */ 845db792e4Sbill #define NODEV (dev_t)(-1) 855db792e4Sbill 865db792e4Sbill /* 875db792e4Sbill * Clustering of hardware pages on machines with ridiculously small 885db792e4Sbill * page sizes is done here. The paging subsystem deals with units of 89f520e942Skarels * CLSIZE pte's describing NBPG (from machine/machparam.h) pages each. 905db792e4Sbill * 915db792e4Sbill * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE 925db792e4Sbill */ 93248881f8Swnj #define CLBYTES (CLSIZE*NBPG) 94e163c03cSwnj #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */ 95248881f8Swnj #define claligned(x) ((((int)(x))&CLOFSET)==0) 96248881f8Swnj #define CLOFF CLOFSET 97b481cdefSroot #define CLSHIFT (PGSHIFT+CLSIZELOG2) 985db792e4Sbill 99b481cdefSroot #if CLSIZE==1 100b481cdefSroot #define clbase(i) (i) 101b481cdefSroot #define clrnd(i) (i) 102b481cdefSroot #else 1035db792e4Sbill /* give the base virtual address (first of CLSIZE) */ 1045db792e4Sbill #define clbase(i) ((i) &~ (CLSIZE-1)) 1055db792e4Sbill /* round a number of clicks up to a whole cluster */ 1065db792e4Sbill #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1)) 107b481cdefSroot #endif 1085db792e4Sbill 1094bda8b2fSkarels /* CBLOCK is the size of a clist block, must be power of 2 */ 1104bda8b2fSkarels #define CBLOCK 64 1112a0e599eSmarc #define CBQSIZE (CBLOCK/NBBY) /* quote bytes/cblock - can do better */ 1122a0e599eSmarc #define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE) /* data chars/clist */ 1134bda8b2fSkarels #define CROUND (CBLOCK - 1) /* clist rounding */ 1145db792e4Sbill 1155db792e4Sbill /* 116389af1dfSmckusic * File system parameters and macros. 117389af1dfSmckusic * 118389af1dfSmckusic * The file system is made out of blocks of at most MAXBSIZE units, 119389af1dfSmckusic * with smaller units (fragments) only in the last direct block. 120389af1dfSmckusic * MAXBSIZE primarily determines the size of buffers in the buffer 121389af1dfSmckusic * pool. It may be made larger without any effect on existing 122389af1dfSmckusic * file systems; however making it smaller make make some file 123389af1dfSmckusic * systems unmountable. 124389af1dfSmckusic * 125389af1dfSmckusic * Note that the blocked devices are assumed to have DEV_BSIZE 126389af1dfSmckusic * "sectors" and that fragments must be some multiple of this size. 12791d57239Smckusick * Block devices are read in BLKDEV_IOSIZE units. This number must 12891d57239Smckusick * be a power of two and in the range of 12991d57239Smckusick * DEV_BSIZE <= BLKDEV_IOSIZE <= MAXBSIZE 13091d57239Smckusick * This size has no effect upon the file system, but is usually set 13191d57239Smckusick * to the block size of the root file system, so as to maximize the 13291d57239Smckusick * speed of ``fsck''. 133389af1dfSmckusic */ 134389af1dfSmckusic #define MAXBSIZE 8192 135389af1dfSmckusic #define MAXFRAG 8 136389af1dfSmckusic 137edc472f6Skre /* 138389af1dfSmckusic * MAXPATHLEN defines the longest permissable path length 139389af1dfSmckusic * after expanding symbolic links. It is used to allocate 140389af1dfSmckusic * a temporary buffer from the buffer pool in which to do the 141389af1dfSmckusic * name expansion, hence should be a power of two, and must 142389af1dfSmckusic * be less than or equal to MAXBSIZE. 143389af1dfSmckusic * MAXSYMLINKS defines the maximum number of symbolic links 144389af1dfSmckusic * that may be expanded in a path name. It should be set high 145389af1dfSmckusic * enough to allow all legitimate uses, but halt infinite loops 146389af1dfSmckusic * reasonably quickly. 147389af1dfSmckusic */ 1484a9959f4Sbostic #define MAXPATHLEN PATH_MAX 149389af1dfSmckusic #define MAXSYMLINKS 8 150389af1dfSmckusic 151389af1dfSmckusic /* 1522fe64d92Smckusick * Constants for setting the parameters of the kernel memory allocator. 1532fe64d92Smckusick * 1542fe64d92Smckusick * 2 ** MINBUCKET is the smallest unit of memory that will be 1552fe64d92Smckusick * allocated. It must be at least large enough to hold a pointer. 1562fe64d92Smckusick * 1572fe64d92Smckusick * Units of memory less or equal to MAXALLOCSAVE will permanently 1582fe64d92Smckusick * allocate physical memory; requests for these size pieces of 1592fe64d92Smckusick * memory are quite fast. Allocations greater than MAXALLOCSAVE must 1602fe64d92Smckusick * always allocate and free physical memory; requests for these 1612fe64d92Smckusick * size allocations should be done infrequently as they will be slow. 1622fe64d92Smckusick * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14) 1632fe64d92Smckusick * and MAXALLOCSIZE must be a power of two. 1642fe64d92Smckusick */ 1652fe64d92Smckusick #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 1662fe64d92Smckusick #define MAXALLOCSAVE (2 * CLBYTES) 1672fe64d92Smckusick 1682fe64d92Smckusick /* 169389af1dfSmckusic * bit map related macros 170389af1dfSmckusic */ 171389af1dfSmckusic #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 172389af1dfSmckusic #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 173389af1dfSmckusic #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 174389af1dfSmckusic #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 175389af1dfSmckusic 176389af1dfSmckusic /* 177389af1dfSmckusic * Macros for fast min/max. 178389af1dfSmckusic */ 179389af1dfSmckusic #define MIN(a,b) (((a)<(b))?(a):(b)) 180389af1dfSmckusic #define MAX(a,b) (((a)>(b))?(a):(b)) 181389af1dfSmckusic 182389af1dfSmckusic /* 183389af1dfSmckusic * Macros for counting and rounding. 184389af1dfSmckusic */ 18583a906b7Skarels #ifndef howmany 186389af1dfSmckusic #define howmany(x, y) (((x)+((y)-1))/(y)) 18783a906b7Skarels #endif 188389af1dfSmckusic #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 1892fe64d92Smckusick #define powerof2(x) ((((x)-1)&(x))==0) 1904233ee38Smckusick 1914233ee38Smckusick /* 1924233ee38Smckusick * Scale factor for scaled integers used to count %cpu time and load avgs. 1934233ee38Smckusick * 1944233ee38Smckusick * The number of CPU `tick's that map to a unique `%age' can be expressed 1954233ee38Smckusick * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 1964233ee38Smckusick * can be calculated (assuming 32 bits) can be closely approximated using 1974233ee38Smckusick * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 1984233ee38Smckusick * 1994233ee38Smckusick * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 2004233ee38Smckusick * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 2014233ee38Smckusick */ 2024233ee38Smckusick #define FSHIFT 11 /* bits to right of fixed binary point */ 2034233ee38Smckusick #define FSCALE (1<<FSHIFT) 204