usr/src/sys/vax/include/pte.h

/*      pte.h   6.3     84/12/20        */

/*
 * VAX page table entry
 *
 * There are two major kinds of pte's: those which have ever existed (and are
 * thus either now in core or on the swap device), and those which have
 * never existed, but which will be filled on demand at first reference.
 * There is a structure describing each.  There is also an ancillary
 * structure used in page clustering.
 */

#ifndef LOCORE
struct pte
{
unsigned int    pg_pfnum:21,            /* core page frame number or 0 */
                :2,
                pg_vreadm:1,            /* modified since vread (or with _m) */
                pg_swapm:1,             /* have to write back to swap */
                pg_fod:1,               /* is fill on demand (=0) */
                pg_m:1,                 /* hardware maintained modified bit */
                pg_prot:4,              /* access control */
                pg_v:1;                 /* valid bit */
};
struct hpte
{
unsigned int    pg_pfnum:21,
                :2,
                pg_high:9;              /* special for clustering */
};
struct fpte
{
unsigned int    pg_blkno:20,            /* file system block number */
                pg_fileno:5,            /* file mapped from or TEXT or ZERO */
                pg_fod:1,               /* is fill on demand (=1) */
                :1,
                pg_prot:4,
                pg_v:1;
};
#endif

#define PG_V            0x80000000
#define PG_PROT         0x78000000
#define PG_M            0x04000000
#define PG_FOD          0x02000000
#define PG_VREADM       0x00800000
#define PG_PFNUM        0x001fffff

#define PG_FZERO        0
#define PG_FTEXT        1
#define PG_FMAX         (PG_FTEXT)

#define PG_NOACC        0
#define PG_KW           0x10000000
#define PG_KR           0x18000000
#define PG_UW           0x20000000
#define PG_URKW         0x70000000
#define PG_URKR         0x78000000

/*
 * Pte related macros
 */
#define dirty(pte)      ((pte)->pg_fod == 0 && (pte)->pg_pfnum && \
                            ((pte)->pg_m || (pte)->pg_swapm))

#ifndef LOCORE
#ifdef KERNEL

/* utilities defined in locore.s */
extern  struct pte Sysmap[];
extern  struct pte Usrptmap[];
extern  struct pte usrpt[];
extern  struct pte Swapmap[];
extern  struct pte Forkmap[];
extern  struct pte Xswapmap[];
extern  struct pte Xswap2map[];
extern  struct pte Pushmap[];
extern  struct pte Vfmap[];
extern  struct pte mmap[];
extern  struct pte msgbufmap[];
extern  struct pte camap[];
extern  struct pte Nexmap[][16];
#endif
#endif