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pmap.h revision 1.7 
      1 /*	$NetBSD: pmap.h,v 1.7 1996/04/18 08:52:19 leo 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  * 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  *	@(#)pmap.h	7.6 (Berkeley) 5/10/91
     41  */
     42 
     43 #ifndef	_MACHINE_PMAP_H_
     44 #define	_MACHINE_PMAP_H_
     45 
     46 /*
     47  * Pmap stuff (in anticipation of '40 support)
     48  */
     49 struct pmap {
     50 	u_int 	*pm_ptab;	/* KVA of page table */
     51 	u_int	*pm_stab;	/* KVA of segment table */
     52 	u_int	*pm_rtab;	/* KVA of 68040 root table */
     53 	int	pm_stchanged;	/* ST changed */
     54 	short	pm_sref;	/* segment table ref count */
     55 	short	pm_count;	/* pmap reference count */
     56 	long	pm_ptpages;	/* more stats: PT pages */
     57 	simple_lock_data_t	pm_lock;	/* lock on pmap */
     58 	struct pmap_statistics	pm_stats;	/* pmap statistics */
     59 };
     60 
     61 typedef struct pmap *pmap_t;
     62 
     63 /*
     64  * Macros for speed
     65  */
     66 #define PMAP_ACTIVATE(pmapp, pcbp, iscurproc) \
     67 	if ((pmapp) != NULL && (pmapp)->pm_stchanged) { \
     68 		(pcbp)->pcb_ustp = \
     69 		    atari_btop(pmap_extract(pmap_kernel(), \
     70 		    cpu040 ? (vm_offset_t)(pmapp)->pm_rtab : \
     71 		    (vm_offset_t)(pmapp)->pm_stab)); \
     72 		if (iscurproc) \
     73 			loadustp((pcbp)->pcb_ustp); \
     74 		(pmapp)->pm_stchanged = FALSE; \
     75 	}
     76 #define PMAP_DEACTIVATE(pmapp, pcbp)
     77 
     78 /*
     79  * Description of the memory segments. Build in atari_init/start_c().
     80  * This gives a better separation between machine dependent stuff and
     81  * the pmap-module.
     82  */
     83 #define	NPHYS_SEGS	8
     84 struct physeg {
     85 	vm_offset_t	start;		/* PA of first page in segment	*/
     86 	vm_offset_t	end;		/* PA of last  page in segment	*/
     87 	int		first_page;	/* relative page# of 'start'	*/
     88 };
     89 
     90 /*
     91  * For each vm_page_t, there is a list of all currently valid virtual
     92  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
     93  */
     94 typedef struct pv_entry {
     95 	struct pv_entry	*pv_next;	/* next pv_entry */
     96 	struct pmap	*pv_pmap;	/* pmap where mapping lies */
     97 	vm_offset_t	pv_va;		/* virtual address for mapping */
     98 	u_int		*pv_ptste;	/* non-zero if VA maps a PT page */
     99 	struct pmap	*pv_ptpmap;	/* if pv_ptste, pmap for PT page */
    100 	int		pv_flags;	/* flags */
    101 } *pv_entry_t;
    102 
    103 #define	PV_CI		0x01	/* all entries must be cache inhibited */
    104 #define PV_PTPAGE	0x02	/* entry maps a page table page */
    105 
    106 #ifdef	_KERNEL
    107 struct physeg	phys_segs[NPHYS_SEGS];
    108 pv_entry_t	pv_table;	/* array of entries, one per page */
    109 u_int		*Sysmap;
    110 char		*vmmap;		/* map for mem, dumps, etc. */
    111 struct pmap	kernel_pmap_store;
    112 
    113 #ifdef MACHINE_NONCONTIG
    114 #define	pa_index(pa)			pmap_page_index(pa)
    115 #else
    116 #define pa_index(pa)			atop(pa - vm_first_phys)
    117 #endif /* MACHINE_NONCONTIG */
    118 
    119 #define pa_to_pvh(pa)			(&pv_table[pa_index(pa)])
    120 #define	pmap_kernel()			(&kernel_pmap_store)
    121 #define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
    122 
    123 void	pmap_bootstrap __P((vm_offset_t));
    124 #endif	/* _KERNEL */
    125 
    126 #endif	/* !_MACHINE_PMAP_H_ */
    127