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Annotation of cci/d/ioex/const.h, revision 1.1

1.1     ! root        1: /*             ??????????????????                                      */
        !             2: 
        !             3: 
        !             4: /*     const.h  1.1    8/24/82 */
        !             5: 
        !             6: /*     fundamental constants                                           */
        !             7: 
        !             8: /*
        !             9:  * fundamental constants of the implementation--
        !            10:  * cannot be changed easily.
        !            11: */
        !            12: 
        !            13: #define        NBBY            8               /* number of bits in a byte */
        !            14: #define        NBPW            sizeof(int)     /* number of bytes in an integer */
        !            15: #define        NBPG            1024
        !            16: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
        !            17: #define        PGSHIFT         10              /* LOG2(NBPG) */
        !            18: 
        !            19: #define        NULL    0
        !            20: /*
        !            21:  * Macros for fast min/max
        !            22: */
        !            23: #define        MIN(a,b) (((a)<(b))?(a):(b))
        !            24: #define        MAX(a,b) (((a)>(b))?(a):(b))
        !            25: 
        !            26: 
        !            27: /*
        !            28:  * Machine-dependent bits and macros
        !            29: */
        !            30: #define        UMODE   PSL_CURMOD              /* usermode bits */
        !            31: #define        USERMODE(ps)    (((ps) & UMODE) == UMODE)
        !            32: 
        !            33: #define        BASEPRI(ps)     (((ps) & PSL_IPL) != 0)
        !            34: 
        !            35: /*
        !            36:  * Provide about n microseconds of delay
        !            37: */
        !            38: #define        DELAY(n)        { register int N = (n); while (--N > 0); }
        !            39: 
        !            40: 
        !            41: /*
        !            42:  * system constants used by initialization program
        !            43: */
        !            44: 
        !            45: #define        LSP     511             /*last system page*/
        !            46: #define        MAX_MEM 32*1024*NBPG - 1        /*maximum Tahoe memory*/
        !            47: #define        MEM_INC 512*NBPG        /*memory increment = 1/2 megabyte*/
        !            48: 
        !            49: 
        !            50: 

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