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Annotation of 40BSD/sys/h/vmparam.h, revision 1.1.1.1

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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