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Annotation of researchv10dc/lsys/sys/pte.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * VAX page table entry
        !             3:  *
        !             4:  * There are two major kinds of pte's: those which have ever existed (and are
        !             5:  * thus either now in core or on the swap device), and those which have
        !             6:  * never existed, but which will be filled on demand at first reference.
        !             7:  * There is a structure describing each.  There is also an ancillary
        !             8:  * structure used in page clustering.
        !             9:  */
        !            10: 
        !            11: struct pte
        !            12: {
        !            13: unsigned int   pg_pfnum:21,            /* core page frame number or 0 */
        !            14:                :2,
        !            15:                pg_vreadm:1,            /* modified since vread (or with _m) */
        !            16:                pg_swapm:1,             /* have to write back to swap */
        !            17:                pg_fod:1,               /* is fill on demand (=0) */
        !            18:                pg_m:1,                 /* hardware maintained modified bit */
        !            19:                pg_prot:4,              /* access control */
        !            20:                pg_v:1;                 /* valid bit */
        !            21: };
        !            22: struct hpte
        !            23: {
        !            24: unsigned int   pg_pfnum:21,
        !            25:                :2,
        !            26:                pg_high:9;              /* special for clustering */
        !            27: };
        !            28: struct fpte
        !            29: {
        !            30: unsigned int   pg_blkno:20,            /* file system block number */
        !            31:                pg_source:5,            /* TEXT or ZERO */
        !            32:                pg_fod:1,               /* is fill on demand (=1) */
        !            33:                :1,
        !            34:                pg_prot:4,
        !            35:                pg_v:1;
        !            36: };
        !            37: 
        !            38: #define        PG_V            0x80000000
        !            39: #define        PG_PROT         0x78000000
        !            40: #define        PG_M            0x04000000
        !            41: #define        PG_FOD          0x02000000
        !            42: #define        PG_VREADM       0x00800000
        !            43: #define        PG_PFNUM        0x001fffff
        !            44: 
        !            45: #define PG_FMIN                (NOFILE)
        !            46: #define        PG_FZERO        (PG_FMIN)
        !            47: #define        PG_FTEXT        (PG_FMIN+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: #ifdef KERNEL
        !            59: /*
        !            60:  * Pte related macros
        !            61:  */
        !            62: #define        dirty(pte)      ((pte)->pg_fod == 0 && (pte)->pg_pfnum && \
        !            63:                            ((pte)->pg_m || (pte)->pg_swapm))
        !            64: #define        physadr(a)      ((long)(a)&PGOFSET|(Sysmap[((long)(a)&~KSTART)/NBPG].pg_pfnum*NBPG))
        !            65: 
        !            66: struct pte *vtopte();
        !            67: struct pte *btopte();
        !            68: 
        !            69: /* various pointers into the system page table */
        !            70: extern struct pte *Sysmap;
        !            71: extern struct pte *Usrptmap;
        !            72: extern struct pte *usrpt;
        !            73: extern struct pte *Swapmap;
        !            74: extern struct pte *Forkmap;
        !            75: extern struct pte *Xswapmap;
        !            76: extern struct pte *Xswap2map;
        !            77: extern struct pte *Pushmap;
        !            78: extern struct pte *mmap;
        !            79: extern struct pte *msgbufmap;
        !            80: extern struct pte *camap;
        !            81: extern struct pte *Prusrmap;
        !            82: #endif

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