Home | History | Annotate | Line # | Download | only in include
pmap.h revision 1.3 
      1 /*	$NetBSD: pmap.h,v 1.3 2001/04/21 23:51:22 thorpej 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  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *        This product includes software developed by the NetBSD
     18  *        Foundation, Inc. and its contributors.
     19  * 4. Neither the name of The NetBSD Foundation nor the names of its
     20  *    contributors may be used to endorse or promote products derived
     21  *    from this software without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     25  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     26  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     27  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     33  * POSSIBILITY OF SUCH DAMAGE.
     34  */
     35 
     36 #ifndef	_MACHINE_PMAP_H
     37 #define	_MACHINE_PMAP_H
     38 
     39 /*
     40  * NB:  The details of struct pmap are exposed ONLY when
     41  * building a kernel.  LKMs and user-level programs see
     42  * only this anonymous declaration.  Note that the actual
     43  * declaration may vary on different m68k kernels.
     44  */
     45 struct pmap;
     46 typedef struct pmap *pmap_t;
     47 
     48 /*
     49  * Physical map structures exported to the VM code.
     50  * XXX - Does user-level code really see this struct?
     51  */
     52 
     53 struct pmap {
     54 	unsigned char   	*pm_segmap; 	/* soft copy of segmap */
     55 	int             	pm_ctxnum;	/* MMU context number */
     56 	simple_lock_data_t	pm_lock;    	/* lock on pmap */
     57 	int             	pm_refcount;	/* reference count */
     58 	int             	pm_version;
     59 };
     60 
     61 #ifdef _KERNEL
     62 extern	struct pmap	kernel_pmap_store;
     63 #define	pmap_kernel()	(&kernel_pmap_store)
     64 
     65 /*
     66  * We give the pmap code a chance to resolve faults by
     67  * reloading translations that it was forced to unload.
     68  * This function does that, and calls vm_fault if it
     69  * could not resolve the fault by reloading the MMU.
     70  */
     71 int _pmap_fault __P((vm_map_t, vm_offset_t, vm_prot_t));
     72 
     73 /* This lets us have some say in choosing VA locations. */
     74 extern void pmap_prefer(vm_offset_t, vm_offset_t *);
     75 #define PMAP_PREFER(fo, ap) pmap_prefer((fo), (ap))
     76 
     77 /* This needs to be a macro for kern_sysctl.c */
     78 extern segsz_t pmap_resident_pages(pmap_t);
     79 #define	pmap_resident_count(pmap)	(pmap_resident_pages(pmap))
     80 
     81 /* This needs to be a macro for vm_mmap.c */
     82 extern segsz_t pmap_wired_pages(pmap_t);
     83 #define	pmap_wired_count(pmap)	(pmap_wired_pages(pmap))
     84 
     85 /* We use the PA plus some low bits for device mmap. */
     86 #define pmap_phys_address(addr) 	(addr)
     87 
     88 #define	pmap_update()			/* nothing (yet) */
     89 
     90 /* Our memory is contiguous (or nearly so). */
     91 #define pmap_page_index(pa) (atop(pa))
     92 
     93 /* Map a given physical region to a virtual region */
     94 extern vm_offset_t pmap_map __P((vm_offset_t, vm_offset_t, vm_offset_t, int));
     95 
     96 /* Extract the PMEG for a given physical address. */
     97 extern int _pmap_extract_pmeg __P((pmap_t, vm_offset_t));
     98 
     99 /*
    100  * Since PTEs also contain type bits, we have to have some way
    101  * to tell pmap_enter `this is an IO page' or `this is not to
    102  * be cached'.  Since physical addresses are always aligned, we
    103  * can do this with the low order bits.
    104  *
    105  * The values below must agree with pte.h such that:
    106  *	(PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
    107  */
    108 #define	PMAP_OBMEM	0x00
    109 #define	PMAP_OBIO	0x04	/* tells pmap_enter to use PG_OBIO */
    110 #define	PMAP_VME16	0x08	/* etc */
    111 #define	PMAP_MBMEM	0x08	/* etc (sun-2/120) */
    112 #define	PMAP_MBIO	0x0C	/* etc (sun-2/120) */
    113 /* 0x0C is also used for ??? on the 2/50 */
    114 #define	PMAP_NC		0x00	/* tells pmap_enter to set PG_NC */
    115 #define	PMAP_SPEC	0x0C	/* mask to get all above. */
    116 
    117 #endif	/* _KERNEL */
    118 
    119 void pmap_procwr __P((struct proc *, vaddr_t, size_t));
    120 
    121 #endif	/* _MACHINE_PMAP_H */
    122