usr/src/sys/h/text.h

/*
 * Copyright (c) 1982, 1986 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *      @(#)text.h      7.2 (Berkeley) 10/13/86
 */

/*
 * 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 */
        size_t  x_size;         /* size (clicks) */
        struct proc *x_caddr;   /* ptr to linked proc, if loaded */
        struct inode *x_iptr;   /* inode of prototype */
        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 XPAGI   0x20            /* Page in on demand from inode */
#define XUNUSED 0x40            /* unused since swapped out for cache */

/*
 * 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 */
};