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/* $NetBSD: pte.h,v 1.5 1995/03/28 18:19:26 jtc Exp $ */
/*
* Copyright (c) 1988 University of Utah.
* Copyright (c) 1992, 1993
* 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.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: Utah Hdr: pte.h 1.11 89/09/03
*
* @(#)pte.h 8.1 (Berkeley) 6/10/93
*/
/*
* 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 pt_entry {
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)
#if defined(_KERNEL) && !defined(LOCORE)
/*
* Kernel virtual address to page table entry and visa versa.
*/
#define kvtopte(va) \
(Sysmap + (((vm_offset_t)(va) - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT))
#define ptetokv(pte) \
((((pt_entry_t *)(pte) - Sysmap) << PGSHIFT) + VM_MIN_KERNEL_ADDRESS)
extern pt_entry_t *Sysmap; /* kernel pte table */
extern u_int Sysmapsize; /* number of pte's in Sysmap */
#endif
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