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Annotation of 43BSDTahoe/sys/h/cmap.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)cmap.h      7.1 (Berkeley) 6/4/86
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * core map entry
        !            11:  *
        !            12:  * Limits imposed by this structure:
        !            13:  *
        !            14:  *             limit                cur. size          fields
        !            15:  *     Physical memory*                64 Mb   c_next, c_prev, c_hlink
        !            16:  *     Mounted filesystems             255     c_mdev
        !            17:  *     size of a process segment       1 Gb    c_page
        !            18:  *     filesystem size                 8 Gb    c_blkno
        !            19:  *     proc, text table size           64K     c_ndx
        !            20:  *
        !            21:  *     * memory can be expanded by converting first three entries
        !            22:  *     to bit fields of larger than 16 bits, shrinking c_ndx accordingly,
        !            23:  *     and increasing MAXMEM below.  Also, the type of cmhash
        !            24:  *     (below) must be changed to long.
        !            25:  */
        !            26: #ifndef        LOCORE
        !            27: struct cmap
        !            28: {
        !            29: unsigned short         c_next,         /* index of next free list entry */
        !            30:                c_prev,         /* index of previous free list entry */
        !            31:                c_hlink;        /* hash link for <blkno,mdev> */
        !            32: unsigned short c_ndx;          /* index of owner proc or text */
        !            33: unsigned int   c_page:21,      /* virtual page number in segment */
        !            34:                c_lock:1,       /* locked for raw i/o or pagein */
        !            35:                c_want:1,       /* wanted */
        !            36:                c_intrans:1,    /* intransit bit */
        !            37:                c_free:1,       /* on the free list */
        !            38:                c_gone:1,       /* associated page has been released */
        !            39:                c_type:2,       /* type CSYS or CTEXT or CSTACK or CDATA */
        !            40:                :4,             /* to longword boundary */
        !            41:                c_blkno:24,     /* disk block this is a copy of */
        !            42:                c_mdev:8;       /* which mounted dev this is from */
        !            43: };
        !            44: #else  LOCORE
        !            45: /*
        !            46:  * bit offsets of elements in cmap
        !            47:  */
        !            48: #define        C_INTRANS       87
        !            49: #define        C_FREE          88
        !            50: #define        SZ_CMAP         16              /* sizeof(struct cmap) */
        !            51: 
        !            52: #define        MAXMEM          64*1024         /* maximum memory, in Kbytes */
        !            53: #endif LOCORE
        !            54: 
        !            55: #define        CMHEAD  0
        !            56: 
        !            57: /*
        !            58:  * Shared text pages are not totally abandoned when a process
        !            59:  * exits, but are remembered while in the free list hashed by <mdev,blkno>
        !            60:  * off the cmhash structure so that they can be reattached
        !            61:  * if another instance of the program runs again soon.
        !            62:  */
        !            63: #define        CMHSIZ  2048            /* SHOULD BE DYNAMIC */
        !            64: #define        CMHASH(bn)      ((bn)&(CMHSIZ-1))
        !            65: 
        !            66: #ifndef        LOCORE
        !            67: #ifdef KERNEL
        !            68: struct cmap *cmap;
        !            69: struct cmap *ecmap;
        !            70: int    ncmap;
        !            71: struct cmap *mfind();
        !            72: int    firstfree, maxfree;
        !            73: int    ecmx;                   /* cmap index of ecmap */
        !            74: u_short        cmhash[CMHSIZ];
        !            75: #endif
        !            76: 
        !            77: /* bits defined in c_type */
        !            78: 
        !            79: #define        CSYS            0               /* none of below */
        !            80: #define        CTEXT           1               /* belongs to shared text segment */
        !            81: #define        CDATA           2               /* belongs to data segment */
        !            82: #define        CSTACK          3               /* belongs to stack segment */
        !            83: 
        !            84: #define        pgtocm(x)       (((int) ((x)-firstfree) / CLSIZE) + 1)
        !            85: #define        cmtopg(x)       ((((x)-1) * CLSIZE) + firstfree)
        !            86: #endif LOCORE

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