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pmap.h revision 1.2 
      1 /*
      2  * Copyright (c) 1987 Carnegie-Mellon University
      3  * Copyright (c) 1991 Regents of the University of California.
      4  * All rights reserved.
      5  *
      6  * Changed for the VAX port. /IC
      7  *
      8  * This code is derived from software contributed to Berkeley by
      9  * the Systems Programming Group of the University of Utah Computer
     10  * Science Department.
     11  *
     12  * Redistribution and use in source and binary forms, with or without
     13  * modification, are permitted provided that the following conditions
     14  * are met:
     15  * 1. Redistributions of source code must retain the above copyright
     16  *    notice, this list of conditions and the following disclaimer.
     17  * 2. Redistributions in binary form must reproduce the above copyright
     18  *    notice, this list of conditions and the following disclaimer in the
     19  *    documentation and/or other materials provided with the distribution.
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *	This product includes software developed by the University of
     23  *	California, Berkeley and its contributors.
     24  * 4. Neither the name of the University nor the names of its contributors
     25  *    may be used to endorse or promote products derived from this software
     26  *    without specific prior written permission.
     27  *
     28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     38  * SUCH DAMAGE.
     39  *
     40  *	from: @(#)pmap.h	7.6 (Berkeley) 5/10/91
     41  *	$Id: pmap.h,v 1.2 1994/08/16 23:41:56 ragge Exp $
     42  */
     43 
     44 
     45 #ifndef	PMAP_H
     46 #define	PMAP_H
     47 
     48 #include "vm/vm_param.h"
     49 #include "vm/lock.h"
     50 /* #include "vm/vm_statistics.h" */
     51 
     52 #define VAX_PAGE_SIZE	NBPG
     53 #define VAX_SEG_SIZE	NBSEG
     54 
     55 /*
     56  *  Pmap structure
     57  */
     58 
     59 /* XXX Should reside in #include "include/pmap.h" */
     60 typedef struct pmap {
     61   simple_lock_data_t       lock;        /* lock on pmap        */
     62   int                      ref_count;   /* reference count     */
     63   struct pmap_statistics   stats;       /* statistics          */
     64   struct pmap             *next;        /* list for free pmaps */
     65   struct pte	          *pm_ptab;	/* KVA of page table   */
     66 } *pmap_t;
     67 
     68 #if 0
     69 struct pmap {
     70   struct pte	       *pm_ptab;	/* KVA of page table    */
     71   short			pm_count;	/* pmap reference count */
     72   simple_lock_data_t	pm_lock;	/* lock on pmap         */
     73 };
     74 #endif
     75 
     76 /*typedef struct pmap    *pmap_t;*/
     77 
     78 extern pmap_t		kernel_pmap;
     79 
     80 /*
     81  * Macros for speed
     82  */
     83 
     84 #define PMAP_ACTIVATE(pmapp, pcbp, iscurproc)                  \
     85   if ((pmapp) != NULL && (pmapp)->pm_stchanged) {              \
     86     (pcbp)->pcb_ustp =                                         \
     87         vax_btop(pmap_extract(kernel_pmap, (pmapp)->pm_stab)); \
     88     if (iscurproc)                                             \
     89       loadustp((pcbp)->pcb_ustp);                              \
     90     (pmapp)->pm_stchanged = FALSE;                             \
     91   }
     92 
     93 #define PMAP_DEACTIVATE(pmapp, pcbp)
     94 
     95 /*
     96  * For each vm_page_t, there is a list of all currently valid virtual
     97  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
     98  */
     99 
    100 typedef struct pv_entry {
    101   struct pv_entry	*pv_next;	/* next pv_entry */
    102   struct pmap	        *pv_pmap;/* if not NULL, pmap where mapping lies */
    103   vm_offset_t	         pv_va;		/* virtual address for mapping */
    104   int		         pv_flags;	/* flags */
    105 } *pv_entry_t;
    106 
    107 #define	PV_CI		0x01	        /* all entries must be cache inhibited */
    108 #define PV_PTPAGE	0x02	        /* entry maps a page table page */
    109 
    110 #ifdef	KERNEL
    111 pv_entry_t	pv_table;		/* array of entries,
    112 					   one per LOGICAL page */
    113 
    114 #define pa_index(pa)	                atop(pa)
    115 #define pa_to_pvh(pa)	                (&pv_table[atop(pa)])
    116 
    117 #define	pmap_kernel()			(kernel_pmap)
    118 /* #define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count) */
    119 
    120 extern	struct pte *Sysmap;
    121 extern	char *vmmap;			/* map for mem, dumps, etc. */
    122 #endif	KERNEL
    123 
    124 #endif PMAP_H
    125