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Annotation of 40BSD/sys/h/cmap.h, revision 1.1

1.1     ! root        1: /*     cmap.h  4.1     11/9/80 */
        !             2: 
        !             3: /*
        !             4:  * core map entry
        !             5:  *
        !             6:  * NB: THE SIZE OF THIS STRUCTURE IS WELL KNOWN IN cmap.m
        !             7:  */
        !             8: struct cmap
        !             9: {
        !            10: unsigned int   c_next:13,      /* index of next free list entry */
        !            11:                c_prev:13,      /* index of previous free list entry */
        !            12:                c_mdev:4,       /* which mounted dev this is from */
        !            13:                c_lock:1,       /* locked for raw i/o or pagein */
        !            14:                c_want:1,       /* wanted */
        !            15:                c_page:16,      /* virtual page number in segment */
        !            16:                c_hlink:13,     /* hash link for <blkno,mdev> */
        !            17:                c_intrans:1,    /* intransit bit */
        !            18:                c_free:1,       /* on the free list */
        !            19:                c_gone:1,       /* associated page has been released */
        !            20:                c_type:2,       /* type CSYS or CTEXT or CSTACK or CDATA */
        !            21:                c_blkno:20,     /* disk block this is a copy of */
        !            22:                c_ndx:10;       /* index of owner proc or text */
        !            23: };
        !            24: 
        !            25: #define        CMHEAD  0
        !            26: 
        !            27: /*
        !            28:  * Shared text pages are not totally abandoned when a process
        !            29:  * exits, but are remembered while in the free list hashed by <mdev,blkno>
        !            30:  * off the cmhash structure so that they can be reattached
        !            31:  * if another instance of the program runs again soon.
        !            32:  */
        !            33: #define        CMHSIZ  512             /* SHOULD BE DYNAMIC */
        !            34: #define        CMHASH(bn)      ((bn)&(CMHSIZ-1))
        !            35: 
        !            36: #ifdef KERNEL
        !            37: extern struct cmap *cmap;
        !            38: extern struct cmap *ecmap;
        !            39: struct cmap *mfind();
        !            40: struct cmap zcmap;
        !            41: int    firstfree, maxfree;
        !            42: int    ecmx;                   /* cmap index of ecmap */
        !            43: short  cmhash[CMHSIZ];
        !            44: #endif
        !            45: 
        !            46: /* bits defined in c_type */
        !            47: 
        !            48: #define        CSYS            0               /* none of below */
        !            49: #define        CTEXT           1               /* belongs to shared text segment */
        !            50: #define        CDATA           2               /* belongs to data segment */
        !            51: #define        CSTACK          3               /* belongs to stack segment */
        !            52: 
        !            53: #define        pgtocm(x)       ((((x)-firstfree) / CLSIZE) + 1)
        !            54: #define        cmtopg(x)       ((((x)-1) * CLSIZE) + firstfree)

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