165a1cfb1Smckusick /* 20c67d176Skarels * 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*64716fc5Sbostic * @(#)param.h 7.19 (Berkeley) 12/16/90 765a1cfb1Smckusick */ 85db792e4Sbill 9c2520f22Skarels #define BSD 199006 /* June, 1990 system version (year & month) */ 101a9e6e3cSkarels #define BSD4_3 1 1157ce53b7Skarels #define BSD4_4 0.5 122867d692Sbloom 134a9959f4Sbostic #include <sys/syslimits.h> 144a9959f4Sbostic 155db792e4Sbill /* 16b481cdefSroot * Machine-independent constants 17b481cdefSroot */ 184a9959f4Sbostic #define MAXUPRC CHILD_MAX /* max processes per user */ 194a9959f4Sbostic #define NOFILE OPEN_MAX /* max open files per process */ 204a9959f4Sbostic #define NCARGS ARG_MAX /* # characters in exec arglist */ 2157ce53b7Skarels #define MAXINTERP 32 /* max interpreter file name length */ 224a9959f4Sbostic #define NGROUPS NGROUPS_MAX /* max number groups */ 2377caf3abSkarels #define MAXHOSTNAMELEN 256 /* maximum hostname size */ 2477caf3abSkarels #define MAXCOMLEN 16 /* maximum command name remembered */ 2577caf3abSkarels /* MAXCOMLEN should be >= sizeof(ac_comm) (acct.h) */ 2677caf3abSkarels #define MAXLOGNAME 12 /* maximum login name length */ 2777caf3abSkarels /* MAXLOGNAME must be >= UT_NAMESIZE (<utmp.h>) */ 2845ac661dSwnj 29ebd4ffb8Skarels #define NOGROUP 65535 /* marker for empty group set member */ 30e74c57f3Ssam 315db792e4Sbill /* 32b481cdefSroot * Priorities 335db792e4Sbill */ 345db792e4Sbill #define PSWP 0 358ec93d38Smckusick #define PVM 1 365db792e4Sbill #define PINOD 10 375db792e4Sbill #define PRIBIO 20 38c9c63310Smckusick #define PVFS 22 395db792e4Sbill #define PZERO 25 4057ce53b7Skarels #define PSOCK 26 415db792e4Sbill #define PWAIT 30 42bea46c20Ssam #define PLOCK 35 4357ce53b7Skarels #define PPAUSE 40 445db792e4Sbill #define PUSER 50 4557ce53b7Skarels #define PRIMASK 0x0ff 4657ce53b7Skarels #define PCATCH 0x100 /* or'd with pri for tsleep to check signals */ 475db792e4Sbill 4874c6c69bSkarels #define NZERO 0 495db792e4Sbill 50f520e942Skarels #ifndef LOCORE 51*64716fc5Sbostic #include <sys/types.h> 52f520e942Skarels #endif 53f520e942Skarels 545db792e4Sbill /* 55b481cdefSroot * Signals 565db792e4Sbill */ 570c67d176Skarels #include <sys/signal.h> 5803c2128fSroot 59f520e942Skarels /* 60f520e942Skarels * Machine type dependent parameters. 61f520e942Skarels */ 62*64716fc5Sbostic #include <machine/param.h> 63*64716fc5Sbostic #include <machine/endian.h> 64*64716fc5Sbostic #include <machine/limits.h> 65f520e942Skarels 665db792e4Sbill #define NBPW sizeof(int) /* number of bytes in an integer */ 675db792e4Sbill 680c67d176Skarels #ifndef NULL 695db792e4Sbill #define NULL 0 700c67d176Skarels #endif 71f0028148Skarels #define CMASK 022 /* default mask for file creation */ 725db792e4Sbill #define NODEV (dev_t)(-1) 735db792e4Sbill 745db792e4Sbill /* 755db792e4Sbill * Clustering of hardware pages on machines with ridiculously small 765db792e4Sbill * page sizes is done here. The paging subsystem deals with units of 77f520e942Skarels * CLSIZE pte's describing NBPG (from machine/machparam.h) pages each. 785db792e4Sbill * 795db792e4Sbill * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE 805db792e4Sbill */ 81248881f8Swnj #define CLBYTES (CLSIZE*NBPG) 82e163c03cSwnj #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */ 83248881f8Swnj #define claligned(x) ((((int)(x))&CLOFSET)==0) 84248881f8Swnj #define CLOFF CLOFSET 85b481cdefSroot #define CLSHIFT (PGSHIFT+CLSIZELOG2) 865db792e4Sbill 87b481cdefSroot #if CLSIZE==1 88b481cdefSroot #define clbase(i) (i) 89b481cdefSroot #define clrnd(i) (i) 90b481cdefSroot #else 915db792e4Sbill /* give the base virtual address (first of CLSIZE) */ 925db792e4Sbill #define clbase(i) ((i) &~ (CLSIZE-1)) 935db792e4Sbill /* round a number of clicks up to a whole cluster */ 945db792e4Sbill #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1)) 95b481cdefSroot #endif 965db792e4Sbill 974bda8b2fSkarels /* CBLOCK is the size of a clist block, must be power of 2 */ 984bda8b2fSkarels #define CBLOCK 64 992a0e599eSmarc #define CBQSIZE (CBLOCK/NBBY) /* quote bytes/cblock - can do better */ 1002a0e599eSmarc #define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE) /* data chars/clist */ 1014bda8b2fSkarels #define CROUND (CBLOCK - 1) /* clist rounding */ 1025db792e4Sbill 1035db792e4Sbill /* 104389af1dfSmckusic * File system parameters and macros. 105389af1dfSmckusic * 106389af1dfSmckusic * The file system is made out of blocks of at most MAXBSIZE units, 107389af1dfSmckusic * with smaller units (fragments) only in the last direct block. 108389af1dfSmckusic * MAXBSIZE primarily determines the size of buffers in the buffer 109389af1dfSmckusic * pool. It may be made larger without any effect on existing 110389af1dfSmckusic * file systems; however making it smaller make make some file 111389af1dfSmckusic * systems unmountable. 112389af1dfSmckusic */ 113389af1dfSmckusic #define MAXBSIZE 8192 114389af1dfSmckusic #define MAXFRAG 8 115389af1dfSmckusic 116edc472f6Skre /* 117389af1dfSmckusic * MAXPATHLEN defines the longest permissable path length 118389af1dfSmckusic * after expanding symbolic links. It is used to allocate 119389af1dfSmckusic * a temporary buffer from the buffer pool in which to do the 120389af1dfSmckusic * name expansion, hence should be a power of two, and must 121389af1dfSmckusic * be less than or equal to MAXBSIZE. 122389af1dfSmckusic * MAXSYMLINKS defines the maximum number of symbolic links 123389af1dfSmckusic * that may be expanded in a path name. It should be set high 124389af1dfSmckusic * enough to allow all legitimate uses, but halt infinite loops 125389af1dfSmckusic * reasonably quickly. 126389af1dfSmckusic */ 1274a9959f4Sbostic #define MAXPATHLEN PATH_MAX 128389af1dfSmckusic #define MAXSYMLINKS 8 129389af1dfSmckusic 130389af1dfSmckusic /* 131ab090aa7Skarels * bit map related macros 132ab090aa7Skarels */ 133ab090aa7Skarels #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 134ab090aa7Skarels #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 135ab090aa7Skarels #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 136ab090aa7Skarels #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 137ab090aa7Skarels 138ab090aa7Skarels /* 139ab090aa7Skarels * Macros for counting and rounding. 140ab090aa7Skarels */ 141ab090aa7Skarels #ifndef howmany 142ab090aa7Skarels #define howmany(x, y) (((x)+((y)-1))/(y)) 143ab090aa7Skarels #endif 144ab090aa7Skarels #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 145ab090aa7Skarels #define powerof2(x) ((((x)-1)&(x))==0) 146ab090aa7Skarels 147ab090aa7Skarels /* 148ab090aa7Skarels * Macros for fast min/max: 149ab090aa7Skarels * with inline expansion, the "function" is faster. 150ab090aa7Skarels */ 151ab090aa7Skarels #ifdef KERNEL 152ab090aa7Skarels #define MIN(a,b) min((a), (b)) 153ab090aa7Skarels #define MAX(a,b) max((a), (b)) 154ab090aa7Skarels #else 155ab090aa7Skarels #define MIN(a,b) (((a)<(b))?(a):(b)) 156ab090aa7Skarels #define MAX(a,b) (((a)>(b))?(a):(b)) 157ab090aa7Skarels #endif 158ab090aa7Skarels 159ab090aa7Skarels /* 1602fe64d92Smckusick * Constants for setting the parameters of the kernel memory allocator. 1612fe64d92Smckusick * 1622fe64d92Smckusick * 2 ** MINBUCKET is the smallest unit of memory that will be 1632fe64d92Smckusick * allocated. It must be at least large enough to hold a pointer. 1642fe64d92Smckusick * 1652fe64d92Smckusick * Units of memory less or equal to MAXALLOCSAVE will permanently 1662fe64d92Smckusick * allocate physical memory; requests for these size pieces of 1672fe64d92Smckusick * memory are quite fast. Allocations greater than MAXALLOCSAVE must 1682fe64d92Smckusick * always allocate and free physical memory; requests for these 1692fe64d92Smckusick * size allocations should be done infrequently as they will be slow. 1702fe64d92Smckusick * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14) 1712fe64d92Smckusick * and MAXALLOCSIZE must be a power of two. 1722fe64d92Smckusick */ 1732fe64d92Smckusick #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 1742fe64d92Smckusick #define MAXALLOCSAVE (2 * CLBYTES) 1752fe64d92Smckusick 1762fe64d92Smckusick /* 1774233ee38Smckusick * Scale factor for scaled integers used to count %cpu time and load avgs. 1784233ee38Smckusick * 1794233ee38Smckusick * The number of CPU `tick's that map to a unique `%age' can be expressed 1804233ee38Smckusick * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 1814233ee38Smckusick * can be calculated (assuming 32 bits) can be closely approximated using 1824233ee38Smckusick * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 1834233ee38Smckusick * 1844233ee38Smckusick * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 1854233ee38Smckusick * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 1864233ee38Smckusick */ 1874233ee38Smckusick #define FSHIFT 11 /* bits to right of fixed binary point */ 1884233ee38Smckusick #define FSCALE (1<<FSHIFT) 189