1/*	$NetBSD$	*/
2
3/*-
4 * Copyright (c)2008 YAMAMOTO Takashi,
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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef _X86_PMAP_PV_H_
30#define	_X86_PMAP_PV_H_
31
32#include <sys/mutex.h>
33#include <sys/queue.h>
34
35struct vm_page;
36
37/*
38 * structures to track P->V mapping
39 *
40 * this file is intended to be minimum as it's included by <machine/vmparam.h>.
41 */
42
43/*
44 * pv_pte: describe a pte
45 */
46
47struct pv_pte {
48	struct vm_page *pte_ptp;	/* PTP; NULL for pmap_kernel() */
49	vaddr_t pte_va;			/* VA */
50};
51
52/*
53 * pv_entry: plug pv_pte into lists.
54 */
55
56struct pv_entry {
57	struct pv_pte pve_pte;		/* should be the first member */
58	LIST_ENTRY(pv_entry) pve_list;	/* on pv_head::pvh_list */
59	SLIST_ENTRY(pv_entry) pve_hash;
60};
61#define	pve_next	pve_list.le_next
62
63/*
64 * pmap_page: a structure which is embedded in each vm_page.
65 */
66
67struct pmap_page {
68	union {
69		/* PP_EMBEDDED */
70		struct pv_pte u_pte;
71
72		/* !PP_EMBEDDED */
73		struct pv_head {
74			LIST_HEAD(, pv_entry) pvh_list;
75		} u_head;
76
77		/* PTPs */
78		struct vm_page *u_link;
79	} pp_u;
80#define	pp_pte	pp_u.u_pte
81#define	pp_head	pp_u.u_head
82#define	pp_link	pp_u.u_link
83	uint8_t pp_flags;
84	uint8_t pp_attrs;	/* saved PG_M and PG_U */
85};
86
87/* pp_flags */
88#define	PP_EMBEDDED	1
89
90#define	PMAP_PAGE_INIT(pp)	/* none */
91
92#endif /* !_X86_PMAP_PV_H_ */
93