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pmap3.h revision 1.43.6.2 
      1 /*	$NetBSD: pmap3.h,v 1.43.6.2 2009/01/17 13:28:34 mjf 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  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Physical map structures exported to the VM code.
     34  * XXX - Does user-level code really see this struct?
     35  */
     36 
     37 #include <sys/simplelock.h>
     38 
     39 struct pmap {
     40 	unsigned char   	*pm_segmap; 	/* soft copy of segmap */
     41 	int             	pm_ctxnum;	/* MMU context number */
     42 	struct simplelock	pm_lock;    	/* lock on pmap */
     43 	int             	pm_refcount;	/* reference count */
     44 	int             	pm_version;
     45 };
     46 
     47 #ifdef _KERNEL
     48 /*
     49  * We give the pmap code a chance to resolve faults by
     50  * reloading translations that it was forced to unload.
     51  * This function does that, and calls vm_fault if it
     52  * could not resolve the fault by reloading the MMU.
     53  */
     54 int _pmap_fault(struct vm_map *, vaddr_t, vm_prot_t);
     55 
     56 /* This lets us have some say in choosing VA locations. */
     57 extern void pmap_prefer(vaddr_t, vaddr_t *);
     58 #define PMAP_PREFER(fo, ap, sz, td) pmap_prefer((fo), (ap))
     59 
     60 /* This needs to be a macro for kern_sysctl.c */
     61 extern segsz_t pmap_resident_pages(pmap_t);
     62 #define	pmap_resident_count(pmap)	(pmap_resident_pages(pmap))
     63 
     64 /* This needs to be a macro for vm_mmap.c */
     65 extern segsz_t pmap_wired_pages(pmap_t);
     66 #define	pmap_wired_count(pmap)	(pmap_wired_pages(pmap))
     67 
     68 /* We use the PA plus some low bits for device mmap. */
     69 #define pmap_phys_address(addr) 	(addr)
     70 
     71 #define	pmap_update(pmap)		/* nothing (yet) */
     72 
     73 /* Map a given physical region to a virtual region */
     74 extern vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, int);
     75 
     76 static __inline void
     77 pmap_remove_all(struct pmap *pmap)
     78 {
     79 	/* Nothing. */
     80 }
     81 
     82 /*
     83  * Since PTEs also contain type bits, we have to have some way
     84  * to tell pmap_enter `this is an IO page' or `this is not to
     85  * be cached'.  Since physical addresses are always aligned, we
     86  * can do this with the low order bits.
     87  *
     88  * The values below must agree with pte.h such that:
     89  *	(PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
     90  */
     91 #define	PMAP_OBMEM	0x00	/* unused */
     92 #define	PMAP_OBIO	0x04	/* tells pmap_enter to use PG_OBIO */
     93 #define	PMAP_VME16	0x08	/* etc */
     94 #define	PMAP_VME32	0x0C	/* etc */
     95 #define	PMAP_NC		0x10	/* tells pmap_enter to set PG_NC */
     96 #define	PMAP_SPEC	0x1C	/* mask to get all above. */
     97 
     98 #endif	/* _KERNEL */
     99