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Annotation of cci/d/io/const.h, revision 1.1.1.1

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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