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Annotation of 3BSD/sys/h/pte.h, revision 1.1

1.1     ! root        1: /*     pte.h   2.1     1/5/80  */
        !             2: 
        !             3: /*
        !             4:  * VAX page table entry
        !             5:  *
        !             6:  * There are two major kinds of pte's: those which have ever existed (and are
        !             7:  * thus either now in core or on the swap device), and those which have
        !             8:  * never existed, but which will be filled on demand at first reference.
        !             9:  * There is a structure describing each.  There is also an ancillary
        !            10:  * structure used in page clustering.
        !            11:  */
        !            12: 
        !            13: struct pte
        !            14: {
        !            15: unsigned int   pg_pfnum:21,            /* core page frame number or 0 */
        !            16:                :2,
        !            17:                pg_vreadm:1,            /* modified since vread (or with _m) */
        !            18:                pg_swapm:1,             /* have to write back to swap */
        !            19:                pg_fod:1,               /* is fill on demand (=0) */
        !            20:                pg_m:1,                 /* hardware maintained modified bit */
        !            21:                pg_prot:4,              /* access control */
        !            22:                pg_v:1;                 /* valid bit */
        !            23: };
        !            24: struct hpte
        !            25: {
        !            26: unsigned int   pg_pfnum:21,
        !            27:                :2,
        !            28:                pg_high:9;              /* special for clustering */
        !            29: };
        !            30: struct fpte
        !            31: {
        !            32: unsigned int   pg_blkno:20,            /* file system block number */
        !            33:                pg_fileno:5,            /* file mapped from or TEXT or ZERO */
        !            34:                pg_fod:1,               /* is fill on demand (=1) */
        !            35:                :1,
        !            36:                pg_prot:4,
        !            37:                pg_v:1;
        !            38: };
        !            39: 
        !            40: #define        PG_V            0x80000000
        !            41: #define        PG_PROT         0x78000000
        !            42: #define        PG_M            0x04000000
        !            43: #define        PG_VREADM       0x00800000
        !            44: #define        PG_PFNUM        0x001fffff
        !            45: 
        !            46: #define        PG_FZERO        (NOFILE)
        !            47: #define        PG_FTEXT        (NOFILE+1)
        !            48: #define        PG_FMAX         (PG_FTEXT)
        !            49: 
        !            50: #define        PG_NOACC        0
        !            51: #define        PG_KW           0x10000000
        !            52: #define        PG_KR           0x18000000
        !            53: #define        PG_UW           0x20000000
        !            54: #define        PG_URKW         0x70000000
        !            55: #define        PG_URKR         0x78000000
        !            56: 
        !            57: /*
        !            58:  * Pte related macros
        !            59:  */
        !            60: #define        dirty(pte)      ((pte)->pg_fod == 0 && (pte)->pg_pfnum && \
        !            61:                            ((pte)->pg_m || (pte)->pg_swapm))
        !            62: 
        !            63: #ifdef KERNEL
        !            64: struct pte *vtopte();
        !            65: 
        !            66: /* utilities defined in locore.s */
        !            67: extern struct pte Sysmap[];
        !            68: extern struct pte Umap[];
        !            69: extern struct pte Usrptmap[];
        !            70: extern struct pte usrpt[];
        !            71: extern struct pte Swapmap[];
        !            72: extern struct pte Forkmap[];
        !            73: extern struct pte Xswapmap[];
        !            74: extern struct pte Xswap2map[];
        !            75: extern struct pte Pushmap[];
        !            76: extern struct pte Vfmap[];
        !            77: extern struct pte mmap[];
        !            78: extern struct pte mcrmap[];
        !            79: #endif

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