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pmap.h revision 1.18 
      1 /*	$NetBSD: pmap.h,v 1.18 1997/01/27 19:41:06 gwr Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1996 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Adam Glass and Gordon W. Ross.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #ifndef	_MACHINE_PMAP_
     40 #define	_MACHINE_PMAP_
     41 
     42 /*
     43  * Physical map structures exported to the VM code.
     44  */
     45 
     46 struct pmap {
     47 	int	                pm_refcount;	/* pmap reference count */
     48 	simple_lock_data_t      pm_lock;	/* lock on pmap */
     49 	struct pmap_statistics	pm_stats;	/* pmap statistics */
     50 	int                     pm_version;
     51 	int                     pm_ctxnum;
     52 	unsigned char           *pm_segmap;
     53 };
     54 
     55 typedef struct pmap *pmap_t;
     56 
     57 #ifdef _KERNEL
     58 extern struct pmap	kernel_pmap_store;
     59 #define	pmap_kernel()			(&kernel_pmap_store)
     60 
     61 /* This is called from locore.s:cpu_switch() */
     62 void	pmap_activate __P((pmap_t pmap));
     63 
     64 /*
     65  * We give the pmap code a chance to resolve faults by
     66  * reloading translations that it was forced to unload.
     67  * This function does that, and calls vm_fault if it
     68  * could not resolve the fault by reloading the MMU.
     69  */
     70 int _pmap_fault __P((vm_map_t, vm_offset_t, vm_prot_t));
     71 
     72 /* This lets us have some say in choosing VA locations. */
     73 extern void pmap_prefer(vm_offset_t, vm_offset_t *);
     74 #define PMAP_PREFER(fo, ap) pmap_prefer((fo), (ap))
     75 
     76 /* This needs to be a macro to get code in kern_sysctl.c */
     77 extern segsz_t pmap_resident_pages(pmap_t);
     78 #define	pmap_resident_count(pmap)	pmap_resident_pages(pmap)
     79 
     80 /*
     81  * Since PTEs also contain type bits, we have to have some way
     82  * to tell pmap_enter `this is an IO page' or `this is not to
     83  * be cached'.  Since physical addresses are always aligned, we
     84  * can do this with the low order bits.
     85  *
     86  * The values below must agree with pte.h such that:
     87  *	(PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
     88  */
     89 #define	PMAP_OBIO	0x04		/* tells pmap_enter to use PG_OBIO */
     90 #define	PMAP_VME16	0x08		/* etc */
     91 #define	PMAP_VME32	0x0C		/* etc */
     92 #define	PMAP_NC		0x10		/* tells pmap_enter to set PG_NC */
     93 #define	PMAP_SPEC	0x1C		/* mask to get all above. */
     94 
     95 #endif	/* _KERNEL */
     96 #endif	/* _MACHINE_PMAP_ */
     97