summaryrefslogtreecommitdiff
path: root/sys/uvm/pmap/vmpagemd.h
blob: ef7f43e8bbbf6a6a4639eb8ba90077d0f9e3229d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
/*	$NetBSD: vmpagemd.h,v 1.17 2020/12/20 16:38:26 skrll Exp $	*/

/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Raytheon BBN Technologies Corp and Defense Advanced Research Projects
 * Agency and which was developed by Matt Thomas of 3am Software Foundry.
 *
 * This material is based upon work supported by the Defense Advanced Research
 * Projects Agency and Space and Naval Warfare Systems Center, Pacific, under
 * Contract No. N66001-09-C-2073.
 * Approved for Public Release, Distribution Unlimited
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _UVM_PMAP_VMPAGEMD_H_
#define _UVM_PMAP_VMPAGEMD_H_

#ifdef _LOCORE
#error use assym.h instead
#endif

//#ifdef _MODULE
//#error this file should not be included by loadable kernel modules
//#endif

#ifdef _KERNEL_OPT
#include "opt_modular.h"
#include "opt_multiprocessor.h"
#endif

#include <sys/atomic.h>
#include <sys/mutex.h>

#define	__HAVE_VM_PAGE_MD

typedef struct pv_entry {
	struct pv_entry *pv_next;
	struct pmap *pv_pmap;
	vaddr_t pv_va;
#define	PV_KENTER		__BIT(0)
} *pv_entry_t;

#define	PV_ISKENTER_P(pv)	(((pv->pv_va) & PV_KENTER) != 0)

#ifndef _MODULE

#define	VM_PAGEMD_VMPAGE	__BIT(0)	/* page is vm managed */
#define	VM_PAGEMD_REFERENCED	__BIT(1)	/* page has been referenced */
#define	VM_PAGEMD_MODIFIED	__BIT(2)	/* page has been modified */
#define	VM_PAGEMD_POOLPAGE	__BIT(3)	/* page is used as a poolpage */
#define	VM_PAGEMD_EXECPAGE	__BIT(4)	/* page is exec mapped */
#ifdef PMAP_VIRTUAL_CACHE_ALIASES
#define	VM_PAGEMD_UNCACHED	__BIT(5)	/* page is mapped uncached */
#endif

#define	VM_PAGEMD_VMPAGE_P(mdpg)	(((mdpg)->mdpg_attrs & VM_PAGEMD_VMPAGE) != 0)
#define	VM_PAGEMD_REFERENCED_P(mdpg)	(((mdpg)->mdpg_attrs & VM_PAGEMD_REFERENCED) != 0)
#define	VM_PAGEMD_MODIFIED_P(mdpg)	(((mdpg)->mdpg_attrs & VM_PAGEMD_MODIFIED) != 0)
#define	VM_PAGEMD_POOLPAGE_P(mdpg)	(((mdpg)->mdpg_attrs & VM_PAGEMD_POOLPAGE) != 0)
#define	VM_PAGEMD_EXECPAGE_P(mdpg)	(((mdpg)->mdpg_attrs & VM_PAGEMD_EXECPAGE) != 0)
#ifdef PMAP_VIRTUAL_CACHE_ALIASES
#define	VM_PAGEMD_CACHED_P(mdpg)	(((mdpg)->mdpg_attrs & VM_PAGEMD_UNCACHED) == 0)
#define	VM_PAGEMD_UNCACHED_P(mdpg)	(((mdpg)->mdpg_attrs & VM_PAGEMD_UNCACHED) != 0)
#endif

#endif /* !_MODULE */

struct vm_page_md {
	volatile unsigned long mdpg_attrs;	/* page attributes */
	struct pv_entry mdpg_first;		/* pv_entry first */
#if defined(MULTIPROCESSOR) || defined(MODULAR) || defined(_MODULE)
	kmutex_t *mdpg_lock;			/* pv list lock */
#endif
};

#ifndef _MODULE
#if defined(MULTIPROCESSOR) || defined(MODULAR)
#define	VM_PAGEMD_PVLIST_LOCK_INIT(mdpg) 	(mdpg)->mdpg_lock = NULL
#else
#define	VM_PAGEMD_PVLIST_LOCK_INIT(mdpg)	__nothing
#endif /* MULTIPROCESSOR || MODULAR */

#define	VM_PAGEMD_PVLIST_LOCK(mdpg)	pmap_pvlist_lock(mdpg, 1)
#define	VM_PAGEMD_PVLIST_READLOCK(mdpg)	pmap_pvlist_lock(mdpg, 0)
#define	VM_PAGEMD_PVLIST_UNLOCK(mdpg)	pmap_pvlist_unlock(mdpg)
#define	VM_PAGEMD_PVLIST_LOCKED_P(mdpg)	pmap_pvlist_locked_p(mdpg)
#define	VM_PAGEMD_PVLIST_GEN(mdpg)	((mdpg)->mdpg_attrs >> 16)

#define	VM_PAGEMD_PVLIST_EMPTY_P(mdpg)	((mdpg)->mdpg_first.pv_pmap == NULL)

#ifdef _KERNEL
#if defined(MULTIPROCESSOR) || defined(MODULAR)
kmutex_t *pmap_pvlist_lock_addr(struct vm_page_md *);
#else
extern kmutex_t pmap_pvlist_mutex;
static __inline kmutex_t *
pmap_pvlist_lock_addr(struct vm_page_md *mdpg)
{
	return &pmap_pvlist_mutex;
}
#endif

static __inline uintptr_t
pmap_pvlist_lock(struct vm_page_md *mdpg, uintptr_t increment)
{
	mutex_spin_enter(pmap_pvlist_lock_addr(mdpg));
	const uintptr_t gen = VM_PAGEMD_PVLIST_GEN(mdpg);
	mdpg->mdpg_attrs += increment << 16;
	return gen;
}

static __inline uintptr_t
pmap_pvlist_unlock(struct vm_page_md *mdpg)
{
	const uintptr_t gen = VM_PAGEMD_PVLIST_GEN(mdpg);
	mutex_spin_exit(pmap_pvlist_lock_addr(mdpg));
	return gen;
}

static __inline bool
pmap_pvlist_locked_p(struct vm_page_md *mdpg)
{

	return mutex_owned(pmap_pvlist_lock_addr(mdpg));
}
#endif /* _KERNEL */

#define VM_MDPAGE_INIT(pg)						\
do {									\
	(pg)->mdpage.mdpg_first.pv_next = NULL;				\
	(pg)->mdpage.mdpg_first.pv_pmap = NULL;				\
	(pg)->mdpage.mdpg_first.pv_va = VM_PAGE_TO_PHYS(pg);		\
	(pg)->mdpage.mdpg_attrs = VM_PAGEMD_VMPAGE;			\
	VM_PAGEMD_PVLIST_LOCK_INIT(&(pg)->mdpage);			\
} while (/* CONSTCOND */ 0)

#endif /* _MODULE */

#endif /* _UVM_PMAP_VMPAGEMD_H_ */