1*389af1dfSmckusic /* "@(#)param.h 2.1 3/25/82" */ 2*389af1dfSmckusic 3*389af1dfSmckusic /* param.h 4.17 82/04/19 */ 45db792e4Sbill 55db792e4Sbill /* 645ac661dSwnj * Tunable variables which do not usually vary per system. 75db792e4Sbill * 845ac661dSwnj * The sizes of most system tables are configured 945ac661dSwnj * into each system description. The file system buffer 1045ac661dSwnj * cache size is assigned based on available memory. 1145ac661dSwnj * The tables whose sizes don't vary often are given here. 125db792e4Sbill */ 135db792e4Sbill 1416850871Sbill #define NMOUNT 15 /* number of mountable file systems */ 1516850871Sbill #define MSWAPX 15 /* pseudo mount table index for swapdev */ 165db792e4Sbill #define MAXUPRC 25 /* max processes per user */ 175db792e4Sbill #define SSIZE 4 /* initial stack size (*512 bytes) */ 185db792e4Sbill #define SINCR 4 /* increment of stack (*512 bytes) */ 195db792e4Sbill #define NOFILE 20 /* max open files per process */ 2045ac661dSwnj /* NOFILE MUST NOT BE >= 31; SEE pte.h */ 215db792e4Sbill #define CANBSIZ 256 /* max size of typewriter line */ 225eb5d423Sbill #define NCARGS 10240 /* # characters in exec arglist */ 2345ac661dSwnj 245db792e4Sbill /* 255db792e4Sbill * priorities 265db792e4Sbill * probably should not be 275db792e4Sbill * altered too much 285db792e4Sbill */ 295db792e4Sbill 305db792e4Sbill #define PSWP 0 315db792e4Sbill #define PINOD 10 325db792e4Sbill #define PRIBIO 20 335db792e4Sbill #define PRIUBA 24 345db792e4Sbill #define PZERO 25 355db792e4Sbill #define PPIPE 26 365db792e4Sbill #define PWAIT 30 375db792e4Sbill #define PSLEP 40 385db792e4Sbill #define PUSER 50 395db792e4Sbill 405db792e4Sbill #define NZERO 20 415db792e4Sbill 425db792e4Sbill /* 435db792e4Sbill * signals 445db792e4Sbill * dont change 455db792e4Sbill */ 465db792e4Sbill 4746cc71adSbill #ifndef NSIG 4846cc71adSbill #include <signal.h> 4946cc71adSbill #endif 50c6983186Sbill 51c6983186Sbill /* 52c6983186Sbill * Return values from tsleep(). 53c6983186Sbill */ 54c6983186Sbill #define TS_OK 0 /* normal wakeup */ 55c6983186Sbill #define TS_TIME 1 /* timed-out wakeup */ 56c6983186Sbill #define TS_SIG 2 /* asynchronous signal wakeup */ 575db792e4Sbill 585db792e4Sbill /* 595db792e4Sbill * fundamental constants of the implementation-- 605db792e4Sbill * cannot be changed easily. 615db792e4Sbill */ 625db792e4Sbill 63e163c03cSwnj #define NBBY 8 /* number of bits in a byte */ 645db792e4Sbill #define NBPW sizeof(int) /* number of bytes in an integer */ 65e163c03cSwnj #define NBPG 512 66e163c03cSwnj #define PGOFSET (NBPG-1) /* byte offset into page */ 67e163c03cSwnj #define PGSHIFT 9 /* LOG2(NBPG) */ 685db792e4Sbill 69e163c03cSwnj #define UPAGES 8 /* pages of u-area */ 705db792e4Sbill #define NULL 0 715db792e4Sbill #define CMASK 0 /* default mask for file creation */ 725db792e4Sbill #define NODEV (dev_t)(-1) 7341fc41bdSwnj #define NGRPS 256 /* max number groups */ 745db792e4Sbill 755db792e4Sbill /* 765db792e4Sbill * Clustering of hardware pages on machines with ridiculously small 775db792e4Sbill * page sizes is done here. The paging subsystem deals with units of 785db792e4Sbill * CLSIZE pte's describing NBPG (from vm.h) pages each... BSIZE must 795db792e4Sbill * be CLSIZE*NBPG in the current implementation, that is the paging subsystem 805db792e4Sbill * deals with the same size blocks that the file system uses. 815db792e4Sbill * 825db792e4Sbill * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE 835db792e4Sbill */ 845db792e4Sbill #define CLSIZE 2 85248881f8Swnj #define CLBYTES (CLSIZE*NBPG) 86e163c03cSwnj #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */ 87248881f8Swnj #define claligned(x) ((((int)(x))&CLOFSET)==0) 88248881f8Swnj #define CLOFF CLOFSET 89248881f8Swnj #define CLSHIFT (PGSHIFT+1) 905db792e4Sbill 915db792e4Sbill /* give the base virtual address (first of CLSIZE) */ 925db792e4Sbill #define clbase(i) ((i) &~ (CLSIZE-1)) 935db792e4Sbill 945db792e4Sbill /* round a number of clicks up to a whole cluster */ 955db792e4Sbill #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1)) 965db792e4Sbill 975db792e4Sbill #ifndef INTRLVE 985db792e4Sbill /* macros replacing interleaving functions */ 995db792e4Sbill #define dkblock(bp) ((bp)->b_blkno) 1005db792e4Sbill #define dkunit(bp) (minor((bp)->b_dev) >> 3) 1015db792e4Sbill #endif 1025db792e4Sbill 1035db792e4Sbill #define CBSIZE 28 /* number of chars in a clist block */ 1045db792e4Sbill #define CROUND 0x1F /* clist rounding; sizeof(int *) + CBSIZE -1*/ 1055db792e4Sbill 1065db792e4Sbill /* 1075db792e4Sbill * Some macros for units conversion 1085db792e4Sbill */ 1095db792e4Sbill /* Core clicks (512 bytes) to segments and vice versa */ 1105db792e4Sbill #define ctos(x) (x) 1115db792e4Sbill #define stoc(x) (x) 1125db792e4Sbill 1135db792e4Sbill /* Core clicks (512 bytes) to disk blocks */ 1145db792e4Sbill #define ctod(x) (x) 1155db792e4Sbill 1165db792e4Sbill /* clicks to bytes */ 1175db792e4Sbill #define ctob(x) ((x)<<9) 1185db792e4Sbill 1195db792e4Sbill /* bytes to clicks */ 1205db792e4Sbill #define btoc(x) ((((unsigned)(x)+511)>>9)) 1215db792e4Sbill 122e0ff83f9Swnj #ifndef KERNEL 123e0ff83f9Swnj #include <sys/types.h> 124e0ff83f9Swnj #else 125e0ff83f9Swnj #include "../h/types.h" 126e0ff83f9Swnj #endif 12776379a38Sbill 1285db792e4Sbill /* 1295db792e4Sbill * Machine-dependent bits and macros 1305db792e4Sbill */ 1315db792e4Sbill #define UMODE PSL_CURMOD /* usermode bits */ 1325db792e4Sbill #define USERMODE(ps) (((ps) & UMODE) == UMODE) 1335db792e4Sbill 1345db792e4Sbill #define BASEPRI(ps) (((ps) & PSL_IPL) != 0) 135e0ff83f9Swnj 136e0ff83f9Swnj /* 137*389af1dfSmckusic * File system parameters and macros. 138*389af1dfSmckusic * 139*389af1dfSmckusic * The file system is made out of blocks of at most MAXBSIZE units, 140*389af1dfSmckusic * with smaller units (fragments) only in the last direct block. 141*389af1dfSmckusic * MAXBSIZE primarily determines the size of buffers in the buffer 142*389af1dfSmckusic * pool. It may be made larger without any effect on existing 143*389af1dfSmckusic * file systems; however making it smaller make make some file 144*389af1dfSmckusic * systems unmountable. 145*389af1dfSmckusic * 146*389af1dfSmckusic * Note that the blocked devices are assumed to have DEV_BSIZE 147*389af1dfSmckusic * "sectors" and that fragments must be some multiple of this size. 148*389af1dfSmckusic */ 149*389af1dfSmckusic #define MAXBSIZE 8192 150*389af1dfSmckusic #define DEV_BSIZE 512 151*389af1dfSmckusic #define MAXFRAG 8 152*389af1dfSmckusic 153*389af1dfSmckusic /* 154*389af1dfSmckusic * MAXPATHLEN defines the longest permissable path length 155*389af1dfSmckusic * after expanding symbolic links. It is used to allocate 156*389af1dfSmckusic * a temporary buffer from the buffer pool in which to do the 157*389af1dfSmckusic * name expansion, hence should be a power of two, and must 158*389af1dfSmckusic * be less than or equal to MAXBSIZE. 159*389af1dfSmckusic * MAXSYMLINKS defines the maximum number of symbolic links 160*389af1dfSmckusic * that may be expanded in a path name. It should be set high 161*389af1dfSmckusic * enough to allow all legitimate uses, but halt infinite loops 162*389af1dfSmckusic * reasonably quickly. 163*389af1dfSmckusic */ 164*389af1dfSmckusic #define MAXPATHLEN 1024 165*389af1dfSmckusic #define MAXSYMLINKS 8 166*389af1dfSmckusic 167*389af1dfSmckusic /* 168*389af1dfSmckusic * bit map related macros 169*389af1dfSmckusic */ 170*389af1dfSmckusic #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 171*389af1dfSmckusic #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 172*389af1dfSmckusic #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 173*389af1dfSmckusic #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 174*389af1dfSmckusic 175*389af1dfSmckusic /* 176*389af1dfSmckusic * Macros for fast min/max. 177*389af1dfSmckusic */ 178*389af1dfSmckusic #define MIN(a,b) (((a)<(b))?(a):(b)) 179*389af1dfSmckusic #define MAX(a,b) (((a)>(b))?(a):(b)) 180*389af1dfSmckusic 181*389af1dfSmckusic /* 182*389af1dfSmckusic * Macros for counting and rounding. 183*389af1dfSmckusic */ 184*389af1dfSmckusic #define howmany(x, y) (((x)+((y)-1))/(y)) 185*389af1dfSmckusic #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 186*389af1dfSmckusic 187*389af1dfSmckusic /* 188*389af1dfSmckusic * Provide about n microseconds of delay. 189e0ff83f9Swnj */ 190e0ff83f9Swnj #define DELAY(n) { register int N = (n); while (--N > 0); } 191