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- /*
- * $Header: /ax/networking:include/sys/param.h:networking 1.2 $
- * $Source: /ax/networking:include/sys/param.h: $
- *
- * Copyright (c) 1988 Acorn Computers Ltd., Cambridge, England
- *
- * $Log: param.h,v $
- * Revision 1.2 95/04/20 16:39:55 kwelton
- * Two main changes:
- *
- * 1) NBBY and NBPW now protected against multiple declarations.
- *
- * 2) #ifdef arm changed to correct form of #ifdef __arm
- *
- * Revision 1.1 95/01/11 10:19:31 kwelton
- * Initial revision
- *
- * Revision 1.3 88/06/17 20:20:10 beta
- * Acorn Unix initial beta version
- *
- */
- /* @(#)param.h 1.5 87/09/03 3.2/4.3NFSSRC */
- /*
- * 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
-
- /*
- * Machine type dependent parameters.
- */
- #ifdef KERNEL
- # include "sysconf.h"
- # include "../machine/machparam.h"
- #else
- # include "sysconf.h"
- # include <machine/machparam.h>
- #endif
-
- /* If you want to change this, talk to the CEGB */
-
- #define HZ 100
-
- #define NPTEPG (NBPG/(sizeof (struct pte)))
- #define MAXPT 256 /* Maximum number of pages per process */
-
- /*
- * 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 MAXLINK 32767 /* max links */
- #define CANBSIZ 256 /* max size of typewriter line */
-
- #ifdef vax
- # define NCARGS 20480 /* # characters in exec arglist */
- #endif vax
-
- #define NGROUPS 16 /* max number groups */
-
- #define NOGROUP 65535 /* marker for empty group set member */
-
- /*
- * Priorities
- */
- /* PCATCH was added for use in the krpc routines */
- #define PMASK 0177 /* mask for PCATCH */
- #define PCATCH 0400 /* return if sleep interrupted, don't longjmp */
-
- #define PSWP 0
- #define PINOD 10
- #define PRIBIO 20
- #define PRIUBA 24
- #define PZERO 25
- #define PPIPE 26
- #define PVFS 27
- #define PWAIT 30
- #define PLOCK 35
- #define PSLEP 40
- #define PUSER 50
-
- #define NZERO 0
-
- /*
- * Signals
- */
- #ifdef KERNEL
- # include "sys/signal.h"
- #else
- # include "signal.h"
- #endif
-
- #define ISSIG(p) \
- ((p)->p_sig && ((p)->p_flag&STRC || \
- ((p)->p_sig &~ ((p)->p_sigignore | (p)->p_sigmask))) && issig())
-
- /*
- * Fundamental constants of the implementation.
- */
- #ifndef NBBY
- # define NBBY 8 /* number of bits in a byte */
- #endif
-
- #ifndef NBPW
- # define NBPW sizeof(int) /* number of bytes in an integer */
- #endif
-
- #ifndef NULL
- # define NULL 0
- #endif
-
- #define CMASK 022 /* default mask for file creation */
- #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... BSIZE must
- * be CLSIZE*NBPG in the current implementation, that is the paging subsystem
- * deals with the same size blocks that the file system uses.
- *
- * 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 */
-
- #ifndef KERNEL
- # include "sys/types.h"
- #else
- # ifndef LOCORE
- # include "sys/types.h"
- # endif
- #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
- #ifdef __arm
- # define NCBLKS 3
- # define NCARGS (NCBLKS*MAXBSIZE)
- #endif /* arm */
-
- #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 20
-
- /*
- * 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))
-
- /*
- * Scale factor for scaled integers used to count
- * %cpu time and load averages.
- */
- #define FSHIFT 8 /* bits to right of fixed binary point */
- #define FSCALE (1<<FSHIFT)
-
- /*
- * Maximum size of hostname recognized and stored in the kernel.
- */
- #define MAXHOSTNAMELEN 64
-
- /* EOF param.h */
-