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
163
164
165
166
167
168
|
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
/* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/* All Rights Reserved */
/*
* University Copyright- Copyright (c) 1982, 1986, 1988
* The Regents of the University of California
* All Rights Reserved
*
* University Acknowledgment- Portions of this document are derived from
* software developed by the University of California, Berkeley, and its
* contributors.
*/
#ifndef _VM_SEG_VN_H
#define _VM_SEG_VN_H
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/lgrp.h>
#include <vm/anon.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* A pointer to this structure is passed to segvn_create().
*/
typedef struct segvn_crargs {
struct vnode *vp; /* vnode mapped from */
struct cred *cred; /* credentials */
u_offset_t offset; /* starting offset of vnode for mapping */
uchar_t type; /* type of sharing done */
uchar_t prot; /* protections */
uchar_t maxprot; /* maximum protections */
uint_t flags; /* flags */
struct anon_map *amp; /* anon mapping to map to */
uint_t szc; /* max preferred page size code */
uint_t lgrp_mem_policy_flags;
} segvn_crargs_t;
/*
* (Semi) private data maintained by the seg_vn driver per segment mapping.
*
* The read/write segment lock protects all of segvn_data including the
* vpage array. All fields in segvn_data are treated as read-only when
* the "read" version of the address space and the segment locks are held.
* The "write" version of the segment lock, however, is required in order to
* update the following fields:
*
* pageprot
* prot
* amp
* vpage
*
* softlockcnt
* is written by acquiring either the readers lock on the segment and
* freemem lock, or any lock combination which guarantees exclusive use
* of this segment (e.g., adress space writers lock,
* address space readers lock + segment writers lock).
*/
typedef struct segvn_data {
krwlock_t lock; /* protect segvn_data and vpage array */
kmutex_t segp_slock; /* serialize insertions into seg_pcache */
uchar_t pageprot; /* true if per page protections present */
uchar_t prot; /* current segment prot if pageprot == 0 */
uchar_t maxprot; /* maximum segment protections */
uchar_t type; /* type of sharing done */
u_offset_t offset; /* starting offset of vnode for mapping */
struct vnode *vp; /* vnode that segment mapping is to */
ulong_t anon_index; /* starting index into anon_map anon array */
struct anon_map *amp; /* pointer to anon share structure, if needed */
struct vpage *vpage; /* per-page information, if needed */
struct cred *cred; /* mapping credentials */
size_t swresv; /* swap space reserved for this segment */
uchar_t advice; /* madvise flags for segment */
uchar_t pageadvice; /* true if per page advice set */
ushort_t flags; /* flags - from sys/mman.h */
ssize_t softlockcnt; /* # of pages SOFTLOCKED in seg */
lgrp_mem_policy_info_t policy_info; /* memory allocation policy */
} segvn_data_t;
#ifdef _KERNEL
/*
* Macros for segvn segment driver locking.
*/
#define SEGVN_LOCK_ENTER(as, lock, type) rw_enter((lock), (type))
#define SEGVN_LOCK_EXIT(as, lock) rw_exit((lock))
#define SEGVN_LOCK_DOWNGRADE(as, lock) rw_downgrade((lock))
/*
* Macros to test lock states.
*/
#define SEGVN_LOCK_HELD(as, lock) RW_LOCK_HELD((lock))
#define SEGVN_READ_HELD(as, lock) RW_READ_HELD((lock))
#define SEGVN_WRITE_HELD(as, lock) RW_WRITE_HELD((lock))
/*
* Macro used to detect the need to Break the sharing of COW pages
*
* The rw == S_WRITE is for the COW case
* rw == S_READ and type == SOFTLOCK is for the physio case
* We don't want to share a softlocked page because it can cause problems
* with multithreaded apps but if rw == S_READ_NOCOW it's ok to not break
* sharing of COW pages even in SOFTLOCK case.
*/
#define BREAK_COW_SHARE(rw, type, seg_type) ((rw == S_WRITE || \
(type == F_SOFTLOCK && rw != S_READ_NOCOW)) && \
seg_type == MAP_PRIVATE)
#define SEGVN_ZFOD_ARGS(prot, max) \
{ NULL, NULL, 0, MAP_PRIVATE, prot, max, 0, NULL, 0, 0 }
#define AS_MAP_VNSEGS_USELPGS(crfp, argsp) \
((crfp) == (int (*)())segvn_create && \
(((struct segvn_crargs *)(argsp))->flags & \
(MAP_TEXT | MAP_INITDATA)) && \
((struct segvn_crargs *)(argsp))->vp != NULL && \
((struct segvn_crargs *)(argsp))->amp == NULL)
extern void segvn_init(void);
extern int segvn_create(struct seg *, void *);
extern struct seg_ops segvn_ops;
/*
* Provided as shorthand for creating user zfod segments.
*/
extern caddr_t zfod_argsp;
extern caddr_t kzfod_argsp;
extern caddr_t stack_exec_argsp;
extern caddr_t stack_noexec_argsp;
#endif /* _KERNEL */
#ifdef __cplusplus
}
#endif
#endif /* _VM_SEG_VN_H */
|
