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Annotation of 41BSD/sys/h/vmparam.h, revision 1.1

1.1     ! root        1: /*     vmparam.h       4.1     11/9/80 */
        !             2: 
        !             3: /*
        !             4:  * Machine dependent constants
        !             5:  */
        !             6: #define        NBBY            8               /* number of bits in a byte */
        !             7: #define        NBPG            512             /* number of bytes per page */
        !             8: #define        PGSHIFT         9               /* LOG2(NBPG) */
        !             9: #define        NPTEPG          (NBPG/(sizeof (struct pte)))
        !            10:                                        /* number of ptes per page */
        !            11: #define        PGOFSET         (NBPG-1)        /* byte offset into page */
        !            12: #define        CLOFSET         (CLSIZE*NBPG-1) /* for clusters, like PGOFSET */
        !            13: #define        USRSTACK        (0x80000000-UPAGES*NBPG)
        !            14:                                        /* Start of user stack */
        !            15: #define        P1TOP           0x200000        /* boundary between P0 and P1 regions */
        !            16: #define        AST             0x04000000      /* ast level */
        !            17: 
        !            18: /*
        !            19:  * Virtual memory related constants
        !            20:  *
        !            21:  * note: USRPTSIZE is well known in locore.s
        !            22:  */
        !            23: #define        SLOP    16
        !            24: #define        MAXTSIZ         (6*2048-SLOP)           /* max text size (clicks) */
        !            25: #define        MAXDSIZ         (11*1024-16-SLOP)       /* max data size (clicks) */
        !            26: #define        MAXSSIZ         (11*1024-16-SLOP)       /* max stack size (clicks) */
        !            27: #define        USRPTSIZE       (8*NPTEPG)      /* max number of pages of page tables
        !            28:                                           for resident processes, this is
        !            29:                                           known in locore.s */

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