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Annotation of 43BSDTahoe/sys/h/cmap.h, revision 1.1.1.1

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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