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pmap.h revision 1.5 
      1 /*	$NetBSD: pmap.h,v 1.5 1996/07/02 22:22:20 cgd Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1987 Carnegie-Mellon University
      5  * Copyright (c) 1991, 1993
      6  *	The Regents of the University of California.  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	8.1 (Berkeley) 6/10/93
     41  */
     42 
     43 #ifdef OLD_PMAP
     44 #include <machine/pmap.old.h>
     45 #else
     46 
     47 #ifndef	_PMAP_MACHINE_
     48 #define	_PMAP_MACHINE_
     49 
     50 #include <machine/pte.h>
     51 
     52 #define	ALPHA_PAGE_SIZE	NBPG
     53 #define	ALPHA_SEG_SIZE	NBSEG
     54 
     55 #define alpha_trunc_seg(x)	(((u_long)(x)) & ~(ALPHA_SEG_SIZE-1))
     56 #define alpha_round_seg(x)	alpha_trunc_seg((u_long)(x) + ALPHA_SEG_SIZE-1)
     57 
     58 /*
     59  * Pmap stuff
     60  */
     61 struct pmap {
     62 	pt_entry_t		*pm_ptab;	/* KVA of page table */
     63 	pt_entry_t		*pm_stab;	/* KVA of segment table */
     64 	int			pm_stchanged;	/* ST changed */
     65 	pt_entry_t		pm_stpte;	/* PTE mapping STE */
     66 	short			pm_sref;	/* segment table ref count */
     67 	short			pm_count;	/* pmap reference count */
     68 	simple_lock_data_t	pm_lock;	/* lock on pmap */
     69 	struct pmap_statistics	pm_stats;	/* pmap statistics */
     70 	long			pm_ptpages;	/* more stats: PT pages */
     71 };
     72 
     73 typedef struct pmap	*pmap_t;
     74 
     75 extern struct pmap	kernel_pmap_store;
     76 
     77 #define pmap_kernel()	(&kernel_pmap_store)
     78 #define	active_pmap(pm) \
     79 	((pm) == pmap_kernel() || (pm) == curproc->p_vmspace->vm_map.pmap)
     80 
     81 /*
     82  * Macros for speed
     83  */
     84 #define PMAP_ACTIVATE(pmapp, iscurproc)					\
     85 	if ((pmapp) != NULL && (pmapp)->pm_stchanged) {			\
     86 		if (iscurproc)						\
     87 			loadustp((pmapp)->pm_stpte);			\
     88 		(pmapp)->pm_stchanged = FALSE;				\
     89 	}
     90 #define PMAP_DEACTIVATE(pmapp, pcbp)
     91 
     92 /*
     93  * For each vm_page_t, there is a list of all currently valid virtual
     94  * mappings of that page.  An entry is a pv_entry_t, the list is pv_table.
     95  */
     96 typedef struct pv_entry {
     97 	struct pv_entry	*pv_next;	/* next pv_entry */
     98 	struct pmap	*pv_pmap;	/* pmap where mapping lies */
     99 	vm_offset_t	pv_va;		/* virtual address for mapping */
    100 	pt_entry_t	*pv_ptpte;	/* non-zero if VA maps a PT page */
    101 	struct pmap	*pv_ptpmap;	/* if pv_ptpte, pmap for PT page */
    102 	int		pv_flags;	/* flags */
    103 } *pv_entry_t;
    104 
    105 #define PV_PTPAGE	0x01	/* header: entry maps a page table page */
    106 
    107 /*
    108  * bits of pmap_attributes[]
    109  */
    110 #define	PMAP_ATTR_MOD	0x01			/* modified */
    111 #define	PMAP_ATTR_REF	0x02			/* referenced */
    112 
    113 #ifdef _KERNEL
    114 pv_entry_t	pv_table;		/* array of entries, one per page */
    115 
    116 #define pa_index(pa)		atop(pa - vm_first_phys)
    117 #define pa_to_pvh(pa)		(&pv_table[pa_index(pa)])
    118 
    119 #define	pmap_resident_count(pmap)	((pmap)->pm_stats.resident_count)
    120 #define	pmap_wired_count(pmap)		((pmap)->pm_stats.wired_count)
    121 
    122 extern	pt_entry_t *Sysmap;
    123 extern	char *vmmap;			/* map for mem, dumps, etc. */
    124 
    125 /* Machine-specific functions. */
    126 void	pmap_emulate_reference __P((struct proc *p, vm_offset_t v,
    127 		int user, int write));
    128 #endif /* _KERNEL */
    129 
    130 #endif /* _PMAP_MACHINE_ */
    131 
    132 #endif /* OLD_PMAP */
    133