.ref-79029c32280d78322b4fb003d1cf99489dda7f1c/.ref-BSD-3/usr/src/sys/h/cmap.h

/*      cmap.h  2.1     1/5/80  */

/*
 * core map entry
 *
 * N.B.: sizeof (struct cmap) is well known in cmap.m
 */
struct cmap
{
unsigned int    c_next:14,      /* index of next free list entry */
                c_page:17,      /* virtual page number in segment */
                c_intrans:1,    /* intransit bit */
                c_prev:14,      /* index of previous free list entry */
                c_ndx:10,       /* index of owner proc or text */
                c_flag:8;       /* flags */
};

#define CMHEAD  0

#ifdef  KERNEL
extern  struct cmap *cmap;
extern  struct cmap *ecmap;
int     firstfree, maxfree;
#endif

/* bits defined in c_flag */

#define MTEXT           0x01            /* belongs to shared text segment */
#define MDATA           0x02            /* belongs to data segment */
#define MSTACK          0x04            /* belongs to stack segment */
#define MSYS            0x08            /* allocated to u area */
#define MGONE           0x10            /* associated page has been released */
#define MFREE           0x20            /* on the free list */
#define MLOCK           0x40            /* locked for raw i/o or pagein */
#define MWANT           0x80            /* wanted */

#define pgtocm(x)       ((((x)-firstfree) / CLSIZE) + 1)
#define cmtopg(x)       ((((x)-1) * CLSIZE) + firstfree)