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pmap.h revision 1.19.6.1 
      1 /*	$NetBSD: pmap.h,v 1.19.6.1 2008/06/02 13:22:45 mjf Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #ifndef	_MACHINE_PMAP_H
     30 #define	_MACHINE_PMAP_H
     31 
     32 #include <sys/simplelock.h>
     33 
     34 /*
     35  * NB:  The details of struct pmap are exposed ONLY when
     36  * building a kernel.  LKMs and user-level programs see
     37  * only this anonymous declaration.  Note that the actual
     38  * declaration may vary on different m68k kernels.
     39  */
     40 struct pmap;
     41 typedef struct pmap *pmap_t;
     42 
     43 /*
     44  * Physical map structures exported to the VM code.
     45  * XXX - Does user-level code really see this struct?
     46  */
     47 
     48 struct pmap {
     49 	unsigned char   	*pm_segmap; 	/* soft copy of segmap */
     50 	int             	pm_ctxnum;	/* MMU context number */
     51 	struct simplelock	pm_lock;    	/* lock on pmap */
     52 	int             	pm_refcount;	/* reference count */
     53 	int             	pm_version;
     54 };
     55 
     56 #ifdef _KERNEL
     57 extern	struct pmap	kernel_pmap_store;
     58 #define	pmap_kernel()	(&kernel_pmap_store)
     59 
     60 /*
     61  * We give the pmap code a chance to resolve faults by
     62  * reloading translations that it was forced to unload.
     63  * This function does that, and calls vm_fault if it
     64  * could not resolve the fault by reloading the MMU.
     65  */
     66 int _pmap_fault(struct vm_map *, vaddr_t, vm_prot_t);
     67 
     68 /* This lets us have some say in choosing VA locations. */
     69 extern void pmap_prefer(vaddr_t, vaddr_t *);
     70 #define PMAP_PREFER(fo, ap, sz, td) pmap_prefer((fo), (ap))
     71 
     72 /* This needs to be a macro for kern_sysctl.c */
     73 extern segsz_t pmap_resident_pages(pmap_t);
     74 #define	pmap_resident_count(pmap)	(pmap_resident_pages(pmap))
     75 
     76 /* This needs to be a macro for vm_mmap.c */
     77 extern segsz_t pmap_wired_pages(pmap_t);
     78 #define	pmap_wired_count(pmap)	(pmap_wired_pages(pmap))
     79 
     80 /* We use the PA plus some low bits for device mmap. */
     81 #define pmap_phys_address(addr) 	(addr)
     82 
     83 #define	pmap_update(pmap)		/* nothing (yet) */
     84 
     85 /* Map a given physical region to a virtual region */
     86 extern vaddr_t pmap_map(vaddr_t, paddr_t, paddr_t, int);
     87 
     88 /* Extract the PMEG for a given physical address. */
     89 extern int _pmap_extract_pmeg(pmap_t, vaddr_t);
     90 
     91 static __inline void
     92 pmap_remove_all(struct pmap *pmap)
     93 {
     94 	/* Nothing. */
     95 }
     96 
     97 /*
     98  * Since PTEs also contain type bits, we have to have some way
     99  * to tell pmap_enter `this is an IO page' or `this is not to
    100  * be cached'.  Since physical addresses are always aligned, we
    101  * can do this with the low order bits.
    102  *
    103  * The values below must agree with pte.h such that:
    104  *	(PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
    105  */
    106 #define	PMAP_OBMEM	0x00
    107 #define	PMAP_OBIO	0x04	/* tells pmap_enter to use PG_OBIO */
    108 #define	PMAP_MBMEM	0x08	/* etc (sun-2/120) */
    109 #define	PMAP_MBIO	0x0C	/* etc (sun-2/120) */
    110 #define	PMAP_VME0	0x08	/* etc (sun-2/50) */
    111 #define	PMAP_VME8	0x0C	/* etc (sun-2/50) */
    112 #define	PMAP_NC		0x00	/* tells pmap_enter to set PG_NC */
    113 #define	PMAP_SPEC	0x0C	/* mask to get all above. */
    114 
    115 #endif	/* _KERNEL */
    116 
    117 void pmap_procwr(struct proc *, vaddr_t, size_t);
    118 
    119 #endif	/* _MACHINE_PMAP_H */
    120