usr/src/sys/h/param.h

/*      param.h 2.1     1/5/80  */

/*
 * tunable variables
 *
 * NB: NBUF is well known in locore.s
 */

#define NBUF    48              /* size of buffer cache */
#define NINODE  200             /* number of in core inodes */
#define NFILE   175             /* number of in core file structures */
#define NMOUNT  8               /* number of mountable file systems */
#define MAXUPRC 25              /* max processes per user */
#define SSIZE   4               /* initial stack size (*512 bytes) */
#define SINCR   4               /* increment of stack (*512 bytes) */
#define NOFILE  20              /* max open files per process */
#define CANBSIZ 256             /* max size of typewriter line */
#define SMAPSIZ (4*NPROC)       /* size of swap allocation area */
#define NCALL   40              /* max simultaneous time callouts */
#define NPROC   125             /* max number of processes */
#define NTEXT   60              /* max number of pure texts */
#define NCLIST  500             /* max total clist size */
#define HZ      60              /* Ticks/second of the clock */
#define TIMEZONE (8*60)         /* Minutes westward from Greenwich */
#define DSTFLAG 1               /* Daylight Saving Time applies in this locality */
#define MSGBUFS 128             /* Characters saved from error messages */
#define NCARGS  5120            /* # characters in exec arglist */
/*
 * priorities
 * probably should not be
 * altered too much
 */

#define PSWP    0
#define PINOD   10
#define PRIBIO  20
#define PRIUBA  24
#define PZERO   25
#define PPIPE   26
#define PWAIT   30
#define PSLEP   40
#define PUSER   50

#define NZERO   20

/*
 * signals
 * dont change
 */

#define NSIG    17
/*
 * No more than 16 signals (1-16) because they are
 * stored in bits in a word.
 */
#define SIGHUP  1       /* hangup */
#define SIGINT  2       /* interrupt (rubout) */
#define SIGQUIT 3       /* quit (FS) */
#define SIGINS  4       /* illegal instruction */
#define SIGTRC  5       /* trace or breakpoint */
#define SIGIOT  6       /* iot */
#define SIGEMT  7       /* emt */
#define SIGFPT  8       /* floating exception */
#define SIGKIL  9       /* kill, uncatchable termination */
#define SIGBUS  10      /* bus error */
#define SIGSEG  11      /* segmentation violation */
#define SIGSYS  12      /* bad system call */
#define SIGPIPE 13      /* end of pipe */
#define SIGCLK  14      /* alarm clock */
#define SIGTRM  15      /* Catchable termination */

/*
 * fundamental constants of the implementation--
 * cannot be changed easily.
 * note: UPAGES is well known in locore.s
 */

#define NBPW    sizeof(int)     /* number of bytes in an integer */

#define UPAGES  6               /* pages of u-area */
#define NULL    0
#define CMASK   0               /* default mask for file creation */
#define NODEV   (dev_t)(-1)
#define ROOTINO ((ino_t)2)      /* i number of all roots */
#define SUPERB  ((daddr_t)1)    /* block number of the super block */
#define DIRSIZ  14              /* max characters per directory */

/*
 * 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 CLSIZE  2

/* 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))

#if CLSIZE==1
#define BSIZE   512             /* size of secondary block (bytes) */
#define INOPB   8               /* 8 inodes per block */
#define BMASK   0777            /* BSIZE-1 */
#define BSHIFT  9               /* LOG2(BSIZE) */
#define NMASK   0177            /* NINDIR-1 */
#define NSHIFT  7               /* LOG2(NINDIR) */
#define NICINOD 100             /* number of superblock inodes */
#define NICFREE 50              /* number of superblock free blocks */

#endif

#if CLSIZE==2
#define BSIZE   1024
#define INOPB   16
#define BMASK   01777
#define BSHIFT  10
#define NMASK   0377
#define NSHIFT  8
#define NICINOD 100
#define NICFREE 178
#endif

#if CLSIZE==4
#define BSIZE   2048
#define INOPB   32
#define BMASK   03777
#define BSHIFT  11
#define NMASK   0777
#define NSHIFT  9
#define NICINOD 100
#define NICFREE 434
#endif

/* inumber to disk address and inumber to disk offset */
#define itod(x) ((daddr_t)((((unsigned)(x)+2*INOPB-1)/INOPB)))
#define itoo(x) ((int)(((x)+2*INOPB-1)%INOPB))

/* file system blocks to disk blocks and back */
#define fsbtodb(b)      ((b)*CLSIZE)
#define dbtofsb(b)      ((b)/CLSIZE)

/* BSLOP can be 0 unless you have a TIU/Spider */
#define BSLOP   0               /* In case some device needs bigger buffers */
#define NINDIR  (BSIZE/sizeof(daddr_t))

#define CBSIZE  28              /* number of chars in a clist block */
#define CROUND  0x1F            /* clist rounding; sizeof(int *) + CBSIZE -1*/
#define CLKTICK (1000000/(HZ))  /* microseconds in a clock tick */

/*
 * Some macros for units conversion
 */
/* Core clicks (512 bytes) to segments and vice versa */
#define ctos(x) (x)
#define stoc(x) (x)

/* Core clicks (512 bytes) to disk blocks */
#define ctod(x) (x)

/* clicks to bytes */
#define ctob(x) ((x)<<9)

/* bytes to clicks */
#define btoc(x) ((((unsigned)(x)+511)>>9))

/* major part of a device */
#define major(x)        ((int)(((unsigned)(x)>>8)&0377))

/* minor part of a device */
#define minor(x)        ((int)((x)&0377))

/* make a device number */
#define makedev(x,y)    ((dev_t)(((x)<<8) | (y)))

typedef struct { int r[1]; } *  physadr;
typedef int             daddr_t;
typedef char *          caddr_t;
typedef unsigned short  ino_t;
typedef int             swblk_t;
typedef int             size_t;
typedef int             time_t;
typedef int             label_t[10];
typedef short           dev_t;
typedef int             off_t;

/*
 * Machine-dependent bits and macros
 */
#define UMODE   PSL_CURMOD              /* usermode bits */
#define USERMODE(ps)    (((ps) & UMODE) == UMODE)

#define BASEPRI(ps)     (((ps) & PSL_IPL) != 0)

#ifdef KERNEL
#ifdef lint
int     __void__;
#define VOID    __void__ = (int)
#else
#define VOID
#endif
#endif