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pmap.h revision 1.13 
      1 /*      $NetBSD: pmap.h,v 1.13 1996/02/11 13:46:23 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 pmap_kernel()
     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 /*
     71  * For each vm_page_t, there is a list of all currently valid virtual
     72  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
     73  */
     74 
     75 typedef struct pv_entry {
     76 	struct pv_entry	*pv_next;	/* next pv_entry */
     77 	struct pmap	*pv_pmap;/* if not NULL, pmap where mapping lies */
     78 	vm_offset_t	 pv_va;		/* virtual address for mapping */
     79 	int		 pv_flags;	/* flags */
     80 } *pv_entry_t;
     81 
     82 #define	PV_REF	0x00000001	/* Simulated phys ref bit */
     83 
     84 #define PHYS_TO_PV(phys_page) (&pv_table[((phys_page)>>PAGE_SHIFT)])
     85 
     86 /* ROUND_PAGE used before vm system is initialized */
     87 #define ROUND_PAGE(x)   (((uint)(x) + PAGE_SIZE-1)& ~(PAGE_SIZE - 1))
     88 
     89 /* Mapping macros used when allocating SPT */
     90 #define	MAPVIRT(ptr, count)					\
     91 	(vm_offset_t)ptr = virtual_avail;			\
     92 	virtual_avail += (count) * NBPG;
     93 
     94 #define	MAPPHYS(ptr, count, perm)				\
     95 	pmap_map(virtual_avail, avail_start, avail_start +	\
     96 	    (count) * NBPG, perm);				\
     97 	(vm_offset_t)ptr = virtual_avail;			\
     98 	virtual_avail += (count) * NBPG;				\
     99 	avail_start += (count) * NBPG;
    100 
    101 #ifdef	_KERNEL
    102 pv_entry_t	pv_table;		/* array of entries,
    103 					   one per LOGICAL page */
    104 struct pmap	kernel_pmap_store;
    105 
    106 #define pa_index(pa)	                atop(pa)
    107 #define pa_to_pvh(pa)	                (&pv_table[atop(pa)])
    108 
    109 #define	pmap_kernel()			(&kernel_pmap_store)
    110 
    111 #endif	/* _KERNEL */
    112 
    113 /* Routines that are best to define as macros */
    114 #define	pmap_copy(a,b,c,d,e) 		/* Dont do anything */
    115 #define	pmap_update()	mtpr(0,PR_TBIA)	/* Update buffes */
    116 #define	pmap_pageable(a,b,c,d)		/* Dont do anything */
    117 #define	pmap_collect(pmap)		/* No need so far */
    118 #define	pmap_reference(pmap)	if(pmap) (pmap)->ref_count++
    119 #define	pmap_pinit(pmap)	(pmap)->ref_count=1;
    120 #define	pmap_phys_address(phys) ((u_int)(phys)<<PAGE_SHIFT)
    121 
    122 #endif PMAP_H
    123