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pmap3.h revision 1.24 
      1 /*	$NetBSD: pmap3.h,v 1.24 1998/02/05 04:56:58 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 /*
     40  * Physical map structures exported to the VM code.
     41  * XXX - Does user-level code really see this struct?
     42  */
     43 
     44 struct pmap {
     45 	unsigned char   	*pm_segmap; 	/* soft copy of segmap */
     46 	int             	pm_ctxnum;	/* MMU context number */
     47 	simple_lock_data_t	pm_lock;    	/* lock on pmap */
     48 	int             	pm_refcount;	/* reference count */
     49 	int             	pm_version;
     50 };
     51 
     52 typedef struct pmap *pmap_t;
     53 
     54 #ifdef _KERNEL
     55 extern	struct pmap	kernel_pmap_store;
     56 #define	pmap_kernel()	(&kernel_pmap_store)
     57 
     58 /*
     59  * We give the pmap code a chance to resolve faults by
     60  * reloading translations that it was forced to unload.
     61  * This function does that, and calls vm_fault if it
     62  * could not resolve the fault by reloading the MMU.
     63  */
     64 int _pmap_fault __P((vm_map_t, vm_offset_t, vm_prot_t));
     65 
     66 /* This lets us have some say in choosing VA locations. */
     67 extern void pmap_prefer(vm_offset_t, vm_offset_t *);
     68 #define PMAP_PREFER(fo, ap) pmap_prefer((fo), (ap))
     69 
     70 /* This needs to be a macro for kern_sysctl.c */
     71 extern segsz_t pmap_resident_pages(pmap_t);
     72 #define	pmap_resident_count(pmap)	(pmap_resident_pages(pmap))
     73 
     74 /* This needs to be a macro for vm_mmap.c */
     75 extern segsz_t pmap_wired_pages(pmap_t);
     76 #define	pmap_wired_count(pmap)	(pmap_wired_pages(pmap))
     77 
     78 /* We use the PA plus some low bits for device mmap. */
     79 #define pmap_phys_address(addr) 	(addr)
     80 
     81 /* Our memory is contiguous (or nearly so). */
     82 #define pmap_page_index(pa) (atop(pa))
     83 
     84 /*
     85  * Since PTEs also contain type bits, we have to have some way
     86  * to tell pmap_enter `this is an IO page' or `this is not to
     87  * be cached'.  Since physical addresses are always aligned, we
     88  * can do this with the low order bits.
     89  *
     90  * The values below must agree with pte.h such that:
     91  *	(PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
     92  */
     93 #define	PMAP_OBIO	0x04	/* tells pmap_enter to use PG_OBIO */
     94 #define	PMAP_VME16	0x08	/* etc */
     95 #define	PMAP_VME32	0x0C	/* etc */
     96 #define	PMAP_NC		0x10	/* tells pmap_enter to set PG_NC */
     97 #define	PMAP_SPEC	0x1C	/* mask to get all above. */
     98 
     99 #endif	/* _KERNEL */
    100