1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. The Berkeley software License Agreement 4 * specifies the terms and conditions for redistribution. 5 * 6 * @(#)param.h 7.6 (Berkeley) 10/18/88 7 */ 8 9 #define BSD 198810 /* system version (year & month) */ 10 #define BSD4_3 1 11 12 /* 13 * Machine-independent constants 14 */ 15 #define NMOUNT 20 /* number of mountable file systems */ 16 /* NMOUNT must be <= 255 unless c_mdev (cmap.h) is expanded */ 17 #define MSWAPX NMOUNT /* pseudo mount table index for swapdev */ 18 #define MAXUPRC 40 /* max processes per user */ 19 #define NOFILE 64 /* max open files per process */ 20 #define CANBSIZ 256 /* max size of typewriter line */ 21 #define NCARGS 20480 /* # characters in exec arglist */ 22 #define MAXINTERP 32 /* maximum interpreter file name length */ 23 #define NGROUPS 16 /* max number groups */ 24 #define MAXHOSTNAMELEN 64 /* maximum hostname size */ 25 26 #define NOGROUP 65535 /* marker for empty group set member */ 27 28 /* 29 * Priorities 30 */ 31 #define PSWP 0 32 #define PINOD 10 33 #define PRIBIO 20 34 #define PRIUBA 24 35 #define PZERO 25 36 #define PPIPE 26 37 #define PWAIT 30 38 #define PLOCK 35 39 #define PSLEP 40 40 #define PUSER 50 41 42 #define NZERO 0 43 44 #ifndef KERNEL 45 #include <sys/types.h> 46 #else 47 #ifndef LOCORE 48 #include "types.h" 49 #endif 50 #endif 51 52 /* 53 * Signals 54 */ 55 #ifdef KERNEL 56 #include "signal.h" 57 #else 58 #include <signal.h> 59 #endif 60 61 #define ISSIG(p) \ 62 ((p)->p_sig && ((p)->p_flag&STRC || \ 63 ((p)->p_sig &~ ((p)->p_sigignore | (p)->p_sigmask))) && issig()) 64 65 /* 66 * Machine type dependent parameters. 67 */ 68 #ifdef KERNEL 69 #include "../machine/machparam.h" 70 #else 71 #include <machine/machparam.h> 72 #endif 73 74 #define NBPW sizeof(int) /* number of bytes in an integer */ 75 76 #define NULL 0 77 #define CMASK 022 /* default mask for file creation */ 78 #define NODEV (dev_t)(-1) 79 80 /* 81 * Clustering of hardware pages on machines with ridiculously small 82 * page sizes is done here. The paging subsystem deals with units of 83 * CLSIZE pte's describing NBPG (from machine/machparam.h) pages each. 84 * 85 * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE 86 */ 87 #define CLBYTES (CLSIZE*NBPG) 88 #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */ 89 #define claligned(x) ((((int)(x))&CLOFSET)==0) 90 #define CLOFF CLOFSET 91 #define CLSHIFT (PGSHIFT+CLSIZELOG2) 92 93 #if CLSIZE==1 94 #define clbase(i) (i) 95 #define clrnd(i) (i) 96 #else 97 /* give the base virtual address (first of CLSIZE) */ 98 #define clbase(i) ((i) &~ (CLSIZE-1)) 99 /* round a number of clicks up to a whole cluster */ 100 #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1)) 101 #endif 102 103 /* CBLOCK is the size of a clist block, must be power of 2 */ 104 #define CBLOCK 64 105 #define CBQSIZE (CBLOCK/NBBY) /* quote bytes/cblock - can do better */ 106 #define CBSIZE (CBLOCK - sizeof(struct cblock *) - CBQSIZE) /* data chars/clist */ 107 #define CROUND (CBLOCK - 1) /* clist rounding */ 108 109 /* 110 * File system parameters and macros. 111 * 112 * The file system is made out of blocks of at most MAXBSIZE units, 113 * with smaller units (fragments) only in the last direct block. 114 * MAXBSIZE primarily determines the size of buffers in the buffer 115 * pool. It may be made larger without any effect on existing 116 * file systems; however making it smaller make make some file 117 * systems unmountable. 118 * 119 * Note that the blocked devices are assumed to have DEV_BSIZE 120 * "sectors" and that fragments must be some multiple of this size. 121 * Block devices are read in BLKDEV_IOSIZE units. This number must 122 * be a power of two and in the range of 123 * DEV_BSIZE <= BLKDEV_IOSIZE <= MAXBSIZE 124 * This size has no effect upon the file system, but is usually set 125 * to the block size of the root file system, so as to maximize the 126 * speed of ``fsck''. 127 */ 128 #define MAXBSIZE 8192 129 #define MAXFRAG 8 130 131 /* 132 * MAXPATHLEN defines the longest permissable path length 133 * after expanding symbolic links. It is used to allocate 134 * a temporary buffer from the buffer pool in which to do the 135 * name expansion, hence should be a power of two, and must 136 * be less than or equal to MAXBSIZE. 137 * MAXSYMLINKS defines the maximum number of symbolic links 138 * that may be expanded in a path name. It should be set high 139 * enough to allow all legitimate uses, but halt infinite loops 140 * reasonably quickly. 141 */ 142 #define MAXPATHLEN 1024 143 #define MAXSYMLINKS 8 144 145 /* 146 * Constants for setting the parameters of the kernel memory allocator. 147 * 148 * 2 ** MINBUCKET is the smallest unit of memory that will be 149 * allocated. It must be at least large enough to hold a pointer. 150 * 151 * Units of memory less or equal to MAXALLOCSAVE will permanently 152 * allocate physical memory; requests for these size pieces of 153 * memory are quite fast. Allocations greater than MAXALLOCSAVE must 154 * always allocate and free physical memory; requests for these 155 * size allocations should be done infrequently as they will be slow. 156 * Constraints: CLBYTES <= MAXALLOCSAVE <= 2 ** (MINBUCKET + 14) 157 * and MAXALLOCSIZE must be a power of two. 158 */ 159 #define MINBUCKET 4 /* 4 => min allocation of 16 bytes */ 160 #define MAXALLOCSAVE (2 * CLBYTES) 161 162 /* 163 * bit map related macros 164 */ 165 #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY)) 166 #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY))) 167 #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY))) 168 #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0) 169 170 /* 171 * Macros for fast min/max. 172 */ 173 #define MIN(a,b) (((a)<(b))?(a):(b)) 174 #define MAX(a,b) (((a)>(b))?(a):(b)) 175 176 /* 177 * Macros for counting and rounding. 178 */ 179 #ifndef howmany 180 #define howmany(x, y) (((x)+((y)-1))/(y)) 181 #endif 182 #define roundup(x, y) ((((x)+((y)-1))/(y))*(y)) 183 #define powerof2(x) ((((x)-1)&(x))==0) 184