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Annotation of researchv9/sys/sun3/pte.h, revision 1.1

1.1     ! root        1: /*      @(#)pte.h 1.1 86/02/03 SMI      */
        !             2: 
        !             3: /*
        !             4:  * Copyright (c) 1985 by Sun Microsystems, Inc.
        !             5:  */
        !             6: 
        !             7: /*
        !             8:  * Sun 3 hardware page table entry
        !             9:  *
        !            10:  * There are two major kinds of pte's: those which have ever existed (and are
        !            11:  * thus either now in core or on the swap device), and those which have
        !            12:  * never existed, but which will be filled on demand at first reference.
        !            13:  * There is a structure describing each.
        !            14:  * Note that (pg_v && pg_fod) indicates a special (eg, mmapped) page: 
        !            15:  * it is not paged out (not dirty), nor filled in (still valid).
        !            16:  */
        !            17: 
        !            18: #ifndef LOCORE
        !            19: struct pte {
        !            20:        unsigned int    pg_v:1;         /* valid bit */
        !            21:        unsigned int    pg_prot:2;      /* access protection */
        !            22:        unsigned int    pg_nc:1;        /* no cache bit */
        !            23:        unsigned int    pg_type:2;      /* page type */
        !            24:        unsigned int    pg_r:1;         /* referenced */
        !            25:        unsigned int    pg_m:1;         /* modified */
        !            26:        unsigned int    :3;
        !            27:        unsigned int    pg_fod:1;       /* is fill on demand (=0) */
        !            28:        unsigned int    :1;
        !            29:        unsigned int    pg_pfnum:19;    /* page frame number */
        !            30: };
        !            31: 
        !            32: struct fpte {
        !            33:        unsigned int    pg_v:1;         /* valid bit */
        !            34:        unsigned int    pg_prot:2;      /* access protection */
        !            35:        unsigned int    pg_nc:1;        /* no cache bit */
        !            36:        unsigned int    pg_type:2;      /* page type */
        !            37:        unsigned int    pg_source:5;    /* file mapped from or TEXT or ZERO */
        !            38:        unsigned int    pg_fod:1;       /* is fill on demand (=1) */
        !            39:        unsigned int    pg_blkno:20;    /* file system block number */
        !            40: };
        !            41: #endif
        !            42: 
        !            43: #define        PG_V            0x80000000      /* page is valid */
        !            44: #define        PG_PROT         0x60000000      /* access protection mask */
        !            45: #define                PG_W    0x40000000      /* write enable bit */
        !            46: #define                PG_S    0x20000000      /* system page */
        !            47: #define        PG_NC           0x10000000      /* no cache bit */
        !            48: #define        PG_TYPE         0x0C000000      /* page type mask */
        !            49: #define        PG_R            0x02000000      /* page referenced bit */
        !            50: #define        PG_M            0x01000000      /* page modified bit */
        !            51: #define        PG_FOD          0x00100000      /* page fill-on-demand bit */
        !            52: #define        PG_PFNUM        0x0C07FFFF      /* page # mask - XXX includes type */
        !            53: 
        !            54: #define PG_FMIN                (NOFILE)
        !            55: #define        PG_FZERO        (NOFILE)
        !            56: #define        PG_FTEXT        (NOFILE+1)
        !            57: #define        PG_FMAX         (PG_FTEXT)
        !            58: 
        !            59: #define        PG_KW           (PG_S|PG_W)
        !            60: #define        PG_KR           PG_S
        !            61: #define        PG_UW           PG_W            /* kernel can still access */
        !            62: #define        PG_UWKW         PG_UW
        !            63: #define        PG_UR           0               /* kernel can still access */
        !            64: #define        PG_URKR         PG_UR
        !            65: #define        PG_UPAGE        PG_KW           /* sun3 u pages not user accessable */
        !            66: 
        !            67: #define        PGT_MASK        (3<<26)
        !            68: 
        !            69: #define        PGT_OBMEM       (0<<26)         /* onboard memory */
        !            70: #define        PGT_OBIO        (1<<26)         /* onboard I/O */
        !            71: #define PGT_VME_D16    (2<<26)         /* VMEbus 16-bit data */
        !            72: #define        PGT_VME_D32     (3<<26)         /* VMEbus 32-bit data */
        !            73: 
        !            74: /*
        !            75:  * Pte related macros
        !            76:  */
        !            77: #define        dirty(pte)      ((pte)->pg_fod == 0 && (pte)->pg_pfnum && (pte)->pg_m)
        !            78: 
        !            79: #if defined(KERNEL) && !defined(LOCORE)
        !            80: struct pte *vtopte();
        !            81: 
        !            82: /* utilities defined in locore.s */
        !            83: extern struct pte Sysmap[];
        !            84: extern struct pte Usrptmap[];
        !            85: extern struct pte usrpt[];
        !            86: extern struct pte Swapmap[];
        !            87: extern struct pte Forkmap[];
        !            88: extern struct pte Xswapmap[];
        !            89: extern struct pte Xswap2map[];
        !            90: extern struct pte Pushmap[];
        !            91: extern struct pte Vfmap[];
        !            92: extern struct pte mmap[];
        !            93: extern struct pte msgbufmap[];
        !            94: extern struct pte CMAP1[];
        !            95: extern struct pte CMAP2[];
        !            96: extern struct pte Prusrmap[];
        !            97: #endif defined(KERNEL) && !defined(LOCORE)

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