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Annotation of researchv9/sys.vax/h/param.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Tunable variables which do not usually vary per system.
        !             3:  *
        !             4:  * The sizes of most system tables are configured
        !             5:  * into each system description.  The file system buffer
        !             6:  * cache size is assigned based on available memory.
        !             7:  * The tables whose sizes don't vary often are given here.
        !             8:  */
        !             9: 
        !            10: #define        NMOUNT  62              /* number of mountable file systems (cmap.h) */
        !            11: #define        MSWAPX  15              /* pseudo mount table index for swapdev */
        !            12: #if MANYPROC
        !            13: #define        MAXUPRC 75
        !            14: #else
        !            15: #define        MAXUPRC 35              /* max processes per user */
        !            16: #endif
        !            17: #define        SSIZE   4               /* initial stack size (*512 bytes) */
        !            18: #define        SINCR   4               /* increment of stack (*512 bytes) */
        !            19: #define        NOFILE  128             /* max open files per process */
        !            20: #define        NSYSFILE 4              /* stdin, stdout, stderr, /dev/tty */
        !            21: #define        CANBSIZ 256             /* max size of typewriter line */
        !            22: #define        NCARGS  (16*1024)       /* # characters in exec arglist */
        !            23: #define NGROUPS        32              /* number of simultaneous groups */
        !            24: 
        !            25: /*
        !            26:  * priorities
        !            27:  * probably should not be
        !            28:  * altered too much
        !            29:  */
        !            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        PSLEP   40
        !            39: #define        PUSER   50
        !            40: 
        !            41: #define        NZERO   20
        !            42: 
        !            43: /*
        !            44:  * signals
        !            45:  * dont change
        !            46:  */
        !            47: 
        !            48: #ifndef        NSIG
        !            49: #include <signal.h>
        !            50: #endif
        !            51: 
        !            52: /*
        !            53:  * Return values from tsleep().
        !            54:  */
        !            55: #define        TS_OK   0       /* normal wakeup */
        !            56: #define        TS_TIME 1       /* timed-out wakeup */
        !            57: #define        TS_SIG  2       /* asynchronous signal wakeup */
        !            58: 
        !            59: /*
        !            60:  * fundamental constants of the implementation--
        !            61:  * cannot be changed easily.
        !            62:  */
        !            63: 
        !            64: #define        NBBY            8               /* number of bits in a byte */
        !            65: #define        NBPW            sizeof(int)     /* number of bytes in an integer */
        !            66: #define        NBPG            512
        !            67: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
        !            68: #define        PGSHIFT         9               /* LOG2(NBPG) */
        !            69: 
        !            70: #define        UPAGES  10              /* pages of u-area */
        !            71: #define        NULL    0
        !            72: #define        CMASK   0               /* default mask for file creation */
        !            73: #define        NODEV   (dev_t)(-1)
        !            74: #define        ROOTINO ((ino_t)2)      /* i number of all roots */
        !            75: #define        SUPERB  ((daddr_t)1)    /* block number of the super block */
        !            76: #define        DIRSIZ  14              /* max characters per directory */
        !            77: 
        !            78: /*
        !            79:  * Clustering of hardware pages on machines with ridiculously small
        !            80:  * page sizes is done here.  The paging subsystem deals with units of
        !            81:  * CLSIZE pte's describing NBPG (from vm.h) pages each... BSIZE must
        !            82:  * be CLSIZE*NBPG in the current implementation, that is the paging subsystem
        !            83:  * deals with the same size blocks that the file system uses.
        !            84:  *
        !            85:  * NOTE: SSIZE, SINCR and UPAGES must be multiples of CLSIZE
        !            86:  */
        !            87: #define        CLSIZE  2
        !            88: #define        CLOFSET         (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
        !            89: 
        !            90: /* give the base virtual address (first of CLSIZE) */
        !            91: #define        clbase(i)       ((i) &~ (CLSIZE-1))
        !            92: 
        !            93: /* round a number of clicks up to a whole cluster */
        !            94: #define        clrnd(i)        (((i) + (CLSIZE-1)) &~ (CLSIZE-1))
        !            95: 
        !            96: #if CLSIZE==1
        !            97: #define        BSIZE   512             /* size of secondary block (bytes) */
        !            98: #define        INOPB   8               /* 8 inodes per block */
        !            99: #define        BMASK   0777            /* BSIZE-1 */
        !           100: #define        BSHIFT  9               /* LOG2(BSIZE) */
        !           101: #define        NMASK   0177            /* NINDIR-1 */
        !           102: #define        NSHIFT  7               /* LOG2(NINDIR) */
        !           103: #define        NICINOD 100             /* number of superblock inodes */
        !           104: #define        NICFREE 50              /* number of superblock free blocks */
        !           105: 
        !           106: #endif
        !           107: 
        !           108: #if CLSIZE==2
        !           109: #define BITFS(dev)     ((dev) & 64)
        !           110: #define BUFSIZE                4096
        !           111: #define        BSIZE(dev)      (BITFS(dev)? 4096: 1024)
        !           112: #define        INOPB(dev)      (BITFS(dev)? 64: 16)
        !           113: #define        BMASK(dev)      (BITFS(dev)? 07777: 01777)
        !           114: #define        BSHIFT(dev)     (BITFS(dev)? 12: 10)
        !           115: #define        NMASK(dev)      (BITFS(dev)? 01777: 0377)
        !           116: #define        NSHIFT(dev)     (BITFS(dev)? 10: 8)
        !           117: #define        NICINOD 100
        !           118: #define        NICFREE 178
        !           119: #define itod(dev, x)   ((daddr_t)((((unsigned)(x)+2*INOPB(dev)-1)/INOPB(dev))))
        !           120: #define itoo(dev, x)   ((int)(((x)+2*INOPB(dev)-1)%INOPB(dev)))
        !           121: #define fsbtodb(dev, b)        (BITFS(dev)? (b)*8: (b)*CLSIZE)
        !           122: #define dbtofsb(dev, b)        (BITFS(dev)? (b)/8: (b)/CLSIZE)
        !           123: #define NINDIR(dev)    (BSIZE(dev)/sizeof(daddr_t))
        !           124: #endif
        !           125: 
        !           126: #if CLSIZE==4
        !           127: #define        BSIZE   2048
        !           128: #define        INOPB   32
        !           129: #define        BMASK   03777
        !           130: #define        BSHIFT  11
        !           131: #define        NMASK   0777
        !           132: #define        NSHIFT  9
        !           133: #define        NICINOD 100
        !           134: #define        NICFREE 434
        !           135: #endif
        !           136: 
        !           137: #ifndef INTRLVE
        !           138: /* macros replacing interleaving functions */
        !           139: #define        dkblock(bp)     ((bp)->b_blkno)
        !           140: #define        dkunit(bp)      (minor((bp)->b_dev & 077) >> 3)
        !           141: /* that means 8 units with at most 8 pieces each */
        !           142: #endif
        !           143: 
        !           144: #define        CBSIZE  28              /* number of chars in a clist block */
        !           145: #define        CROUND  0x1F            /* clist rounding; sizeof(int *) + CBSIZE -1*/
        !           146: 
        !           147: /*
        !           148:  * Macros for fast min/max
        !           149:  */
        !           150: #define        MIN(a,b) (((a)<(b))?(a):(b))
        !           151: #define        MAX(a,b) (((a)>(b))?(a):(b))
        !           152: 
        !           153: /*
        !           154:  * Some macros for units conversion
        !           155:  */
        !           156: /* Core clicks (512 bytes) to segments and vice versa */
        !           157: #define        ctos(x) (x)
        !           158: #define        stoc(x) (x)
        !           159: 
        !           160: /* Core clicks (512 bytes) to disk blocks */
        !           161: #define        ctod(x) (x)
        !           162: 
        !           163: /* clicks to bytes */
        !           164: #define        ctob(x) ((x)<<9)
        !           165: 
        !           166: /* bytes to clicks */
        !           167: #define        btoc(x) ((((unsigned)(x)+511)>>9))
        !           168: 
        !           169: #ifndef KERNEL
        !           170: #include       <sys/types.h>
        !           171: #else
        !           172: #include       "../h/types.h"
        !           173: #endif
        !           174: 
        !           175: /*
        !           176:  * Machine-dependent bits and macros
        !           177:  */
        !           178: #define        UMODE   PSL_CURMOD              /* usermode bits */
        !           179: #define        USERMODE(ps)    (((ps) & UMODE) == UMODE)
        !           180: 
        !           181: #define        BASEPRI(ps)     (((ps) & PSL_IPL) != 0)
        !           182: 
        !           183: /*
        !           184:  * Provide about n microseconds of delay
        !           185:  */
        !           186: #define        DELAY(n)        { register int N = (n); while (--N > 0); }

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