pmap.h revision 1.12 
1/*	$NetBSD: pmap.h,v 1.12 2002/09/22 07:17:21 chs 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 */
45struct pmap;
46typedef 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
53struct pmap {
54	unsigned char   	*pm_segmap; 	/* soft copy of segmap */
55	int             	pm_ctxnum;	/* MMU context number */
56	struct simplelock	pm_lock;    	/* lock on pmap */
57	int             	pm_refcount;	/* reference count */
58	int             	pm_version;
59};
60
61#ifdef _KERNEL
62extern	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 */
71int _pmap_fault __P((struct vm_map *, vaddr_t, vm_prot_t));
72
73/* This lets us have some say in choosing VA locations. */
74extern void pmap_prefer __P((vaddr_t, vaddr_t *));
75#define PMAP_PREFER(fo, ap) pmap_prefer((fo), (ap))
76
77/* This needs to be a macro for kern_sysctl.c */
78extern 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 */
82extern 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(pmap)		/* nothing (yet) */
89
90/* Map a given physical region to a virtual region */
91extern vaddr_t pmap_map __P((vaddr_t, paddr_t, paddr_t, int));
92
93/* Extract the PMEG for a given physical address. */
94extern int _pmap_extract_pmeg __P((pmap_t, vaddr_t));
95
96static __inline void
97pmap_remove_all(void)
98{
99	/* Nothing. */
100}
101
102/*
103 * Since PTEs also contain type bits, we have to have some way
104 * to tell pmap_enter `this is an IO page' or `this is not to
105 * be cached'.  Since physical addresses are always aligned, we
106 * can do this with the low order bits.
107 *
108 * The values below must agree with pte.h such that:
109 *	(PMAP_OBIO << PG_MOD_SHIFT) == PGT_OBIO
110 */
111#define	PMAP_OBMEM	0x00
112#define	PMAP_OBIO	0x04	/* tells pmap_enter to use PG_OBIO */
113#define	PMAP_MBMEM	0x08	/* etc (sun-2/120) */
114#define	PMAP_MBIO	0x0C	/* etc (sun-2/120) */
115#define	PMAP_VME0	0x08	/* etc (sun-2/50) */
116#define	PMAP_VME8	0x0C	/* etc (sun-2/50) */
117#define	PMAP_NC		0x00	/* tells pmap_enter to set PG_NC */
118#define	PMAP_SPEC	0x0C	/* mask to get all above. */
119
120#endif	/* _KERNEL */
121
122void pmap_procwr __P((struct proc *, vaddr_t, size_t));
123
124#endif	/* _MACHINE_PMAP_H */
125