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pmap.h revision 1.5 
      1 /*      $NetBSD: pmap.h,v 1.5 1994/11/25 19:08:56 ragge Exp $     */
      2 
      3 /*
      4  * Copyright (c) 1987 Carnegie-Mellon University
      5  * Copyright (c) 1991 Regents of the University of California.
      6  * All rights reserved.
      7  *
      8  * Changed for the VAX port. /IC
      9  *
     10  * This code is derived from software contributed to Berkeley by
     11  * the Systems Programming Group of the University of Utah Computer
     12  * Science Department.
     13  *
     14  * Redistribution and use in source and binary forms, with or without
     15  * modification, are permitted provided that the following conditions
     16  * are met:
     17  * 1. Redistributions of source code must retain the above copyright
     18  *    notice, this list of conditions and the following disclaimer.
     19  * 2. Redistributions in binary form must reproduce the above copyright
     20  *    notice, this list of conditions and the following disclaimer in the
     21  *    documentation and/or other materials provided with the distribution.
     22  * 3. All advertising materials mentioning features or use of this software
     23  *    must display the following acknowledgement:
     24  *	This product includes software developed by the University of
     25  *	California, Berkeley and its contributors.
     26  * 4. Neither the name of the University nor the names of its contributors
     27  *    may be used to endorse or promote products derived from this software
     28  *    without specific prior written permission.
     29  *
     30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     31  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     32  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     33  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     34  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     35  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     36  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     37  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     38  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     39  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     40  * SUCH DAMAGE.
     41  *
     42  *	@(#)pmap.h	7.6 (Berkeley) 5/10/91
     43  */
     44 
     45 
     46 #ifndef	PMAP_H
     47 #define	PMAP_H
     48 
     49 #include "machine/mtpr.h"
     50 
     51 
     52 #define VAX_PAGE_SIZE	NBPG
     53 #define VAX_SEG_SIZE	NBSEG
     54 
     55 /*
     56  *  Pmap structure
     57  *
     58  * p0br == PR_P0BR in user struct, p0br is also == SBR in kernel_pmap
     59  * p1br is the same for stack space, stack is base of alloced pte mem
     60  */
     61 
     62 typedef struct pmap {
     63 	vm_offset_t		 pm_stack; /* Base of alloced p1 pte space */
     64 	struct pcb		*pm_pcb; /* Pointer to PCB for this pmap */
     65 	int                      ref_count;   /* reference count        */
     66 	struct pmap_statistics   stats;       /* statistics             */
     67 	simple_lock_data_t       lock;        /* lock on pmap           */
     68 } *pmap_t;
     69 
     70 extern pmap_t		kernel_pmap;
     71 
     72 /*
     73  * For each vm_page_t, there is a list of all currently valid virtual
     74  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
     75  */
     76 
     77 typedef struct pv_entry {
     78   struct pv_entry	*pv_next;	/* next pv_entry */
     79   struct pmap	        *pv_pmap;/* if not NULL, pmap where mapping lies */
     80   vm_offset_t	         pv_va;		/* virtual address for mapping */
     81   int		         pv_flags;	/* flags */
     82 } *pv_entry_t;
     83 
     84 #define	PV_CI		0x01	        /* all entries must be cache inhibited */
     85 #define PV_PTPAGE	0x02	        /* entry maps a page table page */
     86 
     87 #ifdef	KERNEL
     88 pv_entry_t	pv_table;		/* array of entries,
     89 					   one per LOGICAL page */
     90 
     91 #define pa_index(pa)	                atop(pa)
     92 #define pa_to_pvh(pa)	                (&pv_table[atop(pa)])
     93 
     94 #define	pmap_kernel()			(kernel_pmap)
     95 
     96 extern	struct pte *Sysmap;
     97 extern	char *vmmap;			/* map for mem, dumps, etc. */
     98 #endif	KERNEL
     99 
    100 /* Routines that are best to define as macros */
    101 #define	pmap_copy(a,b,c,d,e) 		/* Dont do anything */
    102 #define	pmap_update()	mtpr(0,PR_TBIA)	/* Update buffes */
    103 #define	pmap_pageable(a,b,c,d)		/* Dont do anything */
    104 #define	pmap_reference(pmap)	if(pmap) (pmap)->ref_count++
    105 #define	pmap_pinit(pmap)	(pmap)->ref_count=1;
    106 
    107 #endif PMAP_H
    108