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*ab090aa7Skarels * @(#)param.h 7.12 (Berkeley) 02/22/90 765a1cfb1Smckusick */ 85db792e4Sbill 9*ab090aa7Skarels #define BSD 199002 /* system version (year & month) */ 101a9e6e3cSkarels #define BSD4_3 1 112867d692Sbloom 124a9959f4Sbostic #include <sys/syslimits.h> 134a9959f4Sbostic 145db792e4Sbill /* 15b481cdefSroot * Machine-independent constants 16b481cdefSroot */ 17*ab090aa7Skarels #define NMOUNT 30 /* 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 */ 22*ab090aa7Skarels #define CANBSIZ 256 /* max size of tty input 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" 600c67d176Skarels #else 610c67d176Skarels #include <sys/signal.h> 620c67d176Skarels #endif 6303c2128fSroot 64f520e942Skarels /* 65f520e942Skarels * Machine type dependent parameters. 66f520e942Skarels */ 67f520e942Skarels #ifdef KERNEL 6893571777Smckusick #include "machine/machparam.h" 69f520e942Skarels #else 70f520e942Skarels #include <machine/machparam.h> 71f520e942Skarels #endif 72f520e942Skarels 735db792e4Sbill #define NBPW sizeof(int) /* number of bytes in an integer */ 745db792e4Sbill 750c67d176Skarels #ifndef NULL 765db792e4Sbill #define NULL 0 770c67d176Skarels #endif 78f0028148Skarels #define CMASK 022 /* default mask for file creation */ 795db792e4Sbill #define NODEV (dev_t)(-1) 805db792e4Sbill 815db792e4Sbill /* 825db792e4Sbill * Clustering of hardware pages on machines with ridiculously small 835db792e4Sbill * page sizes is done here. The paging subsystem deals with units of 84f520e942Skarels * CLSIZE pte's describing NBPG (from machine/machparam.h) pages each. 855db792e4Sbill * 865db792e4Sbill * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE 875db792e4Sbill */ 88248881f8Swnj #define CLBYTES (CLSIZE*NBPG) 89e163c03cSwnj #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */ 90248881f8Swnj #define claligned(x) ((((int)(x))&CLOFSET)==0) 91248881f8Swnj #define CLOFF CLOFSET 92b481cdefSroot #define CLSHIFT (PGSHIFT+CLSIZELOG2) 935db792e4Sbill 94b481cdefSroot #if CLSIZE==1 95b481cdefSroot #define clbase(i) (i) 96b481cdefSroot #define clrnd(i) (i) 97b481cdefSroot #else 985db792e4Sbill /* give the base virtual address (first of CLSIZE) */ 995db792e4Sbill #define clbase(i) ((i) &~ (CLSIZE-1)) 1005db792e4Sbill /* round a number of clicks up to a whole cluster */ 1015db792e4Sbill #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1)) 102b481cdefSroot #endif 1035db792e4Sbill 1044bda8b2fSkarels /* CBLOCK is the size of a clist block, must be power of 2 */ 1054bda8b2fSkarels #define CBLOCK 64 1062a0e599eSmarc #define CBQSIZE (CBLOCK/NBBY) /* quote bytes/cblock - can do better */ 1072a0e599eSmarc #define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE) /* data chars/clist */ 1084bda8b2fSkarels #define CROUND (CBLOCK - 1) /* clist rounding */ 1095db792e4Sbill 1105db792e4Sbill /* 111389af1dfSmckusic * File system parameters and macros. 112389af1dfSmckusic * 113389af1dfSmckusic * The file system is made out of blocks of at most MAXBSIZE units, 114389af1dfSmckusic * with smaller units (fragments) only in the last direct block. 115389af1dfSmckusic * MAXBSIZE primarily determines the size of buffers in the buffer 116389af1dfSmckusic * pool. It may be made larger without any effect on existing 117389af1dfSmckusic * file systems; however making it smaller make make some file 118389af1dfSmckusic * systems unmountable. 119389af1dfSmckusic */ 120389af1dfSmckusic #define MAXBSIZE 8192 121389af1dfSmckusic #define MAXFRAG 8 122389af1dfSmckusic 123edc472f6Skre /* 124389af1dfSmckusic * MAXPATHLEN defines the longest permissable path length 125389af1dfSmckusic * after expanding symbolic links. It is used to allocate 126389af1dfSmckusic * a temporary buffer from the buffer pool in which to do the 127389af1dfSmckusic * name expansion, hence should be a power of two, and must 128389af1dfSmckusic * be less than or equal to MAXBSIZE. 129389af1dfSmckusic * MAXSYMLINKS defines the maximum number of symbolic links 130389af1dfSmckusic * that may be expanded in a path name. It should be set high 131389af1dfSmckusic * enough to allow all legitimate uses, but halt infinite loops 132389af1dfSmckusic * reasonably quickly. 133389af1dfSmckusic */ 1344a9959f4Sbostic #define MAXPATHLEN PATH_MAX 135389af1dfSmckusic #define MAXSYMLINKS 8 136389af1dfSmckusic 137389af1dfSmckusic /* 138*ab090aa7Skarels * bit map related macros 139*ab090aa7Skarels */ 140*ab090aa7Skarels #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 141*ab090aa7Skarels #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 142*ab090aa7Skarels #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 143*ab090aa7Skarels #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 144*ab090aa7Skarels 145*ab090aa7Skarels /* 146*ab090aa7Skarels * Macros for counting and rounding. 147*ab090aa7Skarels */ 148*ab090aa7Skarels #ifndef howmany 149*ab090aa7Skarels #define howmany(x, y) (((x)+((y)-1))/(y)) 150*ab090aa7Skarels #endif 151*ab090aa7Skarels #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 152*ab090aa7Skarels #define powerof2(x) ((((x)-1)&(x))==0) 153*ab090aa7Skarels 154*ab090aa7Skarels /* 155*ab090aa7Skarels * Macros for fast min/max: 156*ab090aa7Skarels * with inline expansion, the "function" is faster. 157*ab090aa7Skarels */ 158*ab090aa7Skarels #ifdef KERNEL 159*ab090aa7Skarels #define MIN(a,b) min((a), (b)) 160*ab090aa7Skarels #define MAX(a,b) max((a), (b)) 161*ab090aa7Skarels #else 162*ab090aa7Skarels #define MIN(a,b) (((a)<(b))?(a):(b)) 163*ab090aa7Skarels #define MAX(a,b) (((a)>(b))?(a):(b)) 164*ab090aa7Skarels #endif 165*ab090aa7Skarels 166*ab090aa7Skarels /* 1672fe64d92Smckusick * Constants for setting the parameters of the kernel memory allocator. 1682fe64d92Smckusick * 1692fe64d92Smckusick * 2 ** MINBUCKET is the smallest unit of memory that will be 1702fe64d92Smckusick * allocated. It must be at least large enough to hold a pointer. 1712fe64d92Smckusick * 1722fe64d92Smckusick * Units of memory less or equal to MAXALLOCSAVE will permanently 1732fe64d92Smckusick * allocate physical memory; requests for these size pieces of 1742fe64d92Smckusick * memory are quite fast. Allocations greater than MAXALLOCSAVE must 1752fe64d92Smckusick * always allocate and free physical memory; requests for these 1762fe64d92Smckusick * size allocations should be done infrequently as they will be slow. 1772fe64d92Smckusick * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14) 1782fe64d92Smckusick * and MAXALLOCSIZE must be a power of two. 1792fe64d92Smckusick */ 1802fe64d92Smckusick #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 1812fe64d92Smckusick #define MAXALLOCSAVE (2 * CLBYTES) 1822fe64d92Smckusick 1832fe64d92Smckusick /* 1844233ee38Smckusick * Scale factor for scaled integers used to count %cpu time and load avgs. 1854233ee38Smckusick * 1864233ee38Smckusick * The number of CPU `tick's that map to a unique `%age' can be expressed 1874233ee38Smckusick * by the formula (1 / (2 ^ (FSHIFT - 11))). The maximum load average that 1884233ee38Smckusick * can be calculated (assuming 32 bits) can be closely approximated using 1894233ee38Smckusick * the formula (2 ^ (2 * (16 - FSHIFT))) for (FSHIFT < 15). 1904233ee38Smckusick * 1914233ee38Smckusick * For the scheduler to maintain a 1:1 mapping of CPU `tick' to `%age', 1924233ee38Smckusick * FSHIFT must be at least 11; this gives us a maximum load avg of ~1024. 1934233ee38Smckusick */ 1944233ee38Smckusick #define FSHIFT 11 /* bits to right of fixed binary point */ 1954233ee38Smckusick #define FSCALE (1<<FSHIFT) 196