usr/src/sys/sys/text.h

/*
 * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution is only permitted until one year after the first shipment
 * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
 * binary forms are permitted provided that: (1) source distributions retain
 * this entire copyright notice and comment, and (2) distributions including
 * binaries display the following acknowledgement:  This product includes
 * software developed by the University of California, Berkeley and its
 * contributors'' in the documentation or other materials provided with the
 * distribution and in all advertising materials mentioning features or use
 * of this software.  Neither the name of the University nor the names of
 * its contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)text.h      7.7 (Berkeley) 6/28/90
 */

/*
 * Text structure.
 * One allocated per pure
 * procedure on swap device.
 * Manipulated by text.c
 */
#define NXDAD   12              /* param.h:MAXTSIZ / vmparam.h:DMTEXT */

struct text
{
        struct  text *x_forw;   /* forward link in free list */
        struct  text **x_back;  /* backward link in free list */
        swblk_t x_daddr[NXDAD]; /* disk addresses of dmtext-page segments */
        swblk_t x_ptdaddr;      /* disk address of page table */
        segsz_t x_size;         /* size (clicks) */
        struct proc *x_caddr;   /* ptr to linked proc, if loaded */
        struct vnode *x_vptr;   /* vnode of prototype */
        time_t  x_mtime;        /* last time modified */
        short   x_rssize;
        short   x_swrss;
        short   x_count;        /* reference count */
        short   x_ccount;       /* number of loaded references */
        char    x_flag;         /* traced, written flags */
        char    x_slptime;
        short   x_poip;         /* page out in progress count */
#if defined(tahoe)
        short   x_ckey;         /* code cache key */
#endif
};

#ifdef  KERNEL
struct  text *text, *textNTEXT;
int     ntext;
#endif

#define XTRC    0x01            /* Text may be written, exclusive use */
#define XWRIT   0x02            /* Text written into, must swap out */
#define XLOAD   0x04            /* Currently being read from file */
#define XLOCK   0x08            /* Being swapped in or out */
#define XWANT   0x10            /* Wanted for swapping */
#define XPAGV   0x20            /* Page in on demand from vnode */
#define XUNUSED 0x40            /* Unused since swapped out for cache */
#define XCACHED 0x80            /* Cached but not sticky */

/*
 * Text table statistics
 */
struct xstats {
        u_long  alloc;                  /* calls to xalloc */
        u_long  alloc_inuse;            /*      found in use/sticky */
        u_long  alloc_cachehit;         /*      found in cache */
        u_long  alloc_cacheflush;       /*      flushed cached text */
        u_long  alloc_unused;           /*      flushed unused cached text */
        u_long  free;                   /* calls to xfree */
        u_long  free_inuse;             /*      still in use/sticky */
        u_long  free_cache;             /*      placed in cache */
        u_long  free_cacheswap;         /*      swapped out to place in cache */
        u_long  purge;                  /* calls to xpurge */
};