usr/src/sys/h/dmap.h

/*      dmap.h  4.1     11/9/80 */

/*
 * Definitions for the mapping of vitual swap
 * space to the physical swap area - the disk map.
 */

#define NDMAP           16      /* size of the swap area map */
#define DMMIN           16      /* the initial block size in clicks */
#define DMMAX           1024    /* max block size alloc on drum = .5M byte */
#define DMTEXT          1024    /* size of blocks of pure text = .5M byte */

struct  dmap
{
        swblk_t dm_size;        /* current size used by process */
        swblk_t dm_alloc;       /* amount of physical swap space allocated */
        swblk_t dm_map[NDMAP];  /* first disk block number in each chunk */
};
#ifdef KERNEL
struct  dmap zdmap;
#endif

/*
 * The following structure is that ``returned''
 * from a call to vstodb().
 */
struct  dblock
{
        swblk_t db_base;        /* base of physical contig drum block */
        swblk_t db_size;        /* size of block */
};