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

/*
 * Copyright (c) 1988 University of Utah.
 * Copyright (c) 1992 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department and Ralph Campbell.
 *
 * %sccs.include.redist.c%
 *
 * from: Utah $Hdr: pte.h 1.11 89/09/03$
 *
 *      @(#)pte.h       7.2 (Berkeley) %G%
 */

/*
 * R2000 hardware page table entry
 */

#ifndef LOCORE
struct pte {
#if BYTE_ORDER == BIG_ENDIAN
unsigned int    pg_pfnum:20,            /* HW: core page frame number or 0 */
                pg_n:1,                 /* HW: non-cacheable bit */
                pg_m:1,                 /* HW: modified (dirty) bit */
                pg_v:1,                 /* HW: valid bit */
                pg_g:1,                 /* HW: ignore pid bit */
                :4,
                pg_swapm:1,             /* SW: page must be forced to swap */
                pg_fod:1,               /* SW: is fill on demand (=0) */
                pg_prot:2;              /* SW: access control */
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
unsigned int    pg_prot:2,              /* SW: access control */
                pg_fod:1,               /* SW: is fill on demand (=0) */
                pg_swapm:1,             /* SW: page must be forced to swap */
                :4,
                pg_g:1,                 /* HW: ignore pid bit */
                pg_v:1,                 /* HW: valid bit */
                pg_m:1,                 /* HW: modified (dirty) bit */
                pg_n:1,                 /* HW: non-cacheable bit */
                pg_pfnum:20;            /* HW: core page frame number or 0 */
#endif
};

typedef union {
        unsigned int    pt_entry;       /* for copying, etc. */
        struct pte      pt_pte;         /* for getting to bits by name */
} pt_entry_t;   /* Mach page table entry */
#endif /* LOCORE */

#define PT_ENTRY_NULL   ((pt_entry_t *) 0)

#define PG_PROT         0x00000003
#define PG_RW           0x00000000
#define PG_RO           0x00000001
#define PG_WIRED        0x00000002
#define PG_G            0x00000100
#define PG_V            0x00000200
#define PG_NV           0x00000000
#define PG_M            0x00000400
#define PG_N            0x00000800
#define PG_FRAME        0xfffff000
#define PG_SHIFT        12
#define PG_PFNUM(x)     (((x) & PG_FRAME) >> PG_SHIFT)

/*
 * Kernel virtual address to page table entry and visa versa.
 */
#define kvtopte(va) \
        ((pt_entry_t *)PMAP_HASH_KADDR + \
        (((vm_offset_t)(va) - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT))
#define ptetokv(pte) \
        ((((pt_entry_t *)(pte) - PMAP_HASH_KADDR) << PGSHIFT) + \
        VM_MIN_KERNEL_ADDRESS)