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- /*
- * Copyright (c) 1982, 1986 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
- *
- * @(#)param.h 7.1 (Berkeley) 6/4/86
- */
-
- #define BSD 43 /* 4.3 * 10, as cpp doesn't do floats */
- #define BSD4_3 1
-
- #define NPTEPG (NBPG/(sizeof (struct pte)))
-
- /*
- * Machine-independent constants
- */
- #define NMOUNT 20 /* number of mountable file systems */
- /* NMOUNT must be <= 255 unless c_mdev (cmap.h) is expanded */
- #define MSWAPX NMOUNT /* pseudo mount table index for swapdev */
- #define MAXUPRC 40 /* max processes per user */
- #define NOFILE 64 /* max open files per process */
- #define CANBSIZ 256 /* max size of typewriter line */
- #define NCARGS 20480 /* # characters in exec arglist */
- #define NGROUPS 16 /* max number groups */
-
- #define NOGROUP 65535 /* marker for empty group set member */
-
- /*
- * Priorities
- */
- #define PSWP 0
- #define PINOD 10
- #define PRIBIO 20
- #define PRIUBA 24
- #define PZERO 25
- #define PPIPE 26
- #define PWAIT 30
- #define PLOCK 35
- #define PSLEP 40
- #define PUSER 50
-
- #define NZERO 0
-
- #include <signal.h>
-
- #define ISSIG(p) \
- ((p)->p_sig && ((p)->p_flag&STRC || \
- ((p)->p_sig &~ ((p)->p_sigignore | (p)->p_sigmask))) && issig())
-
- #define NBPW sizeof(int) /* number of bytes in an integer */
-
- #define NULL 0
- #define CMASK 026 /* default mask for file creation */
- /* was 022, changed 1/15/87 SMS */
- #define NODEV (dev_t)(-1)
-
- /*
- * Clustering of hardware pages on machines with ridiculously small
- * page sizes is done here. The paging subsystem deals with units of
- * CLSIZE pte's describing NBPG (from vm.h) pages each.
- *
- * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE
- */
- #define CLBYTES (CLSIZE*NBPG)
- #define CLOFSET (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
- #define claligned(x) ((((int)(x))&CLOFSET)==0)
- #define CLOFF CLOFSET
- #define CLSHIFT (PGSHIFT+CLSIZELOG2)
-
- #if CLSIZE==1
- #define clbase(i) (i)
- #define clrnd(i) (i)
- #else
- /* give the base virtual address (first of CLSIZE) */
- #define clbase(i) ((i) &~ (CLSIZE-1))
- /* round a number of clicks up to a whole cluster */
- #define clrnd(i) (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
- #endif
-
- /* CBLOCK is the size of a clist block, must be power of 2 */
- #define CBLOCK 64
- #define CBSIZE (CBLOCK - sizeof(struct cblock *)) /* data chars/clist */
- #define CROUND (CBLOCK - 1) /* clist rounding */
-
- #ifdef VMS
- #include "types.h"
- #endif
-
- /*
- * File system parameters and macros.
- *
- * The file system is made out of blocks of at most MAXBSIZE units,
- * with smaller units (fragments) only in the last direct block.
- * MAXBSIZE primarily determines the size of buffers in the buffer
- * pool. It may be made larger without any effect on existing
- * file systems; however making it smaller make make some file
- * systems unmountable.
- *
- * Note that the blocked devices are assumed to have DEV_BSIZE
- * "sectors" and that fragments must be some multiple of this size.
- * Block devices are read in BLKDEV_IOSIZE units. This number must
- * be a power of two and in the range of
- * DEV_BSIZE <= BLKDEV_IOSIZE <= MAXBSIZE
- * This size has no effect upon the file system, but is usually set
- * to the block size of the root file system, so as to maximize the
- * speed of ``fsck''.
- */
- #define MAXBSIZE 8192
- #define DEV_BSIZE 512
- #define DEV_BSHIFT 9 /* log2(DEV_BSIZE) */
- #define BLKDEV_IOSIZE 2048
- #define MAXFRAG 8
-
- #define btodb(bytes) /* calculates (bytes / DEV_BSIZE) */ \
- ((unsigned)(bytes) >> DEV_BSHIFT)
- #define dbtob(db) /* calculates (db * DEV_BSIZE) */ \
- ((unsigned)(db) << DEV_BSHIFT)
-
- /*
- * Map a ``block device block'' to a file system block.
- * This should be device dependent, and will be after we
- * add an entry to cdevsw for that purpose. For now though
- * just use DEV_BSIZE.
- */
- #define bdbtofsb(bn) ((bn) / (BLKDEV_IOSIZE/DEV_BSIZE))
-
- /*
- * MAXPATHLEN defines the longest permissable path length
- * after expanding symbolic links. It is used to allocate
- * a temporary buffer from the buffer pool in which to do the
- * name expansion, hence should be a power of two, and must
- * be less than or equal to MAXBSIZE.
- * MAXSYMLINKS defines the maximum number of symbolic links
- * that may be expanded in a path name. It should be set high
- * enough to allow all legitimate uses, but halt infinite loops
- * reasonably quickly.
- */
- #define MAXPATHLEN 1024
- #define MAXSYMLINKS 8
-
- /*
- * bit map related macros
- */
- #define setbit(a,i) ((a)[(i)/NBBY] |= 1<<((i)%NBBY))
- #define clrbit(a,i) ((a)[(i)/NBBY] &= ~(1<<((i)%NBBY)))
- #define isset(a,i) ((a)[(i)/NBBY] & (1<<((i)%NBBY)))
- #define isclr(a,i) (((a)[(i)/NBBY] & (1<<((i)%NBBY))) == 0)
-
- /*
- * Macros for fast min/max.
- */
- #define MIN(a,b) (((a)<(b))?(a):(b))
- #define MAX(a,b) (((a)>(b))?(a):(b))
-
- /*
- * Macros for counting and rounding.
- */
- #ifndef howmany
- #define howmany(x, y) (((x)+((y)-1))/(y))
- #endif
- #define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
-
- /*
- * Maximum size of hostname recognized and stored in the kernel.
- */
- #define MAXHOSTNAMELEN 64
-