FreeBSD/Linux Kernel Cross Reference
sys/sys/module.h
1 /*-
2 * Copyright (c) 1997 Doug Rabson
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: releng/10.1/sys/sys/module.h 213716 2010-10-12 09:18:17Z kib $
27 */
28
29 #ifndef _SYS_MODULE_H_
30 #define _SYS_MODULE_H_
31
32 /*
33 * Module metadata types
34 */
35 #define MDT_DEPEND 1 /* argument is a module name */
36 #define MDT_MODULE 2 /* module declaration */
37 #define MDT_VERSION 3 /* module version(s) */
38
39 #define MDT_STRUCT_VERSION 1 /* version of metadata structure */
40 #define MDT_SETNAME "modmetadata_set"
41
42 typedef enum modeventtype {
43 MOD_LOAD,
44 MOD_UNLOAD,
45 MOD_SHUTDOWN,
46 MOD_QUIESCE
47 } modeventtype_t;
48
49 typedef struct module *module_t;
50 typedef int (*modeventhand_t)(module_t, int /* modeventtype_t */, void *);
51
52 /*
53 * Struct for registering modules statically via SYSINIT.
54 */
55 typedef struct moduledata {
56 const char *name; /* module name */
57 modeventhand_t evhand; /* event handler */
58 void *priv; /* extra data */
59 } moduledata_t;
60
61 /*
62 * A module can use this to report module specific data to the user via
63 * kldstat(2).
64 */
65 typedef union modspecific {
66 int intval;
67 u_int uintval;
68 long longval;
69 u_long ulongval;
70 } modspecific_t;
71
72 /*
73 * Module dependency declarartion
74 */
75 struct mod_depend {
76 int md_ver_minimum;
77 int md_ver_preferred;
78 int md_ver_maximum;
79 };
80
81 /*
82 * Module version declaration
83 */
84 struct mod_version {
85 int mv_version;
86 };
87
88 struct mod_metadata {
89 int md_version; /* structure version MDTV_* */
90 int md_type; /* type of entry MDT_* */
91 void *md_data; /* specific data */
92 const char *md_cval; /* common string label */
93 };
94
95 #ifdef _KERNEL
96
97 #include <sys/linker_set.h>
98
99 #define MODULE_METADATA(uniquifier, type, data, cval) \
100 static struct mod_metadata _mod_metadata##uniquifier = { \
101 MDT_STRUCT_VERSION, \
102 type, \
103 data, \
104 cval \
105 }; \
106 DATA_SET(modmetadata_set, _mod_metadata##uniquifier)
107
108 #define MODULE_DEPEND(module, mdepend, vmin, vpref, vmax) \
109 static struct mod_depend _##module##_depend_on_##mdepend = { \
110 vmin, \
111 vpref, \
112 vmax \
113 }; \
114 MODULE_METADATA(_md_##module##_on_##mdepend, MDT_DEPEND, \
115 &_##module##_depend_on_##mdepend, #mdepend)
116
117 /*
118 * Every kernel has a 'kernel' module with the version set to
119 * __FreeBSD_version. We embed a MODULE_DEPEND() inside every module
120 * that depends on the 'kernel' module. It uses the current value of
121 * __FreeBSD_version as the minimum and preferred versions. For the
122 * maximum version it rounds the version up to the end of its branch
123 * (i.e. M99999 for M.x). This allows a module built on M.x to work
124 * on M.y systems where y >= x, but fail on M.z systems where z < x.
125 */
126 #define MODULE_KERNEL_MAXVER (roundup(__FreeBSD_version, 100000) - 1)
127
128 #define DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, maxver) \
129 MODULE_DEPEND(name, kernel, __FreeBSD_version, \
130 __FreeBSD_version, maxver); \
131 MODULE_METADATA(_md_##name, MDT_MODULE, &data, #name); \
132 SYSINIT(name##module, sub, order, module_register_init, &data); \
133 struct __hack
134
135 #define DECLARE_MODULE(name, data, sub, order) \
136 DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, MODULE_KERNEL_MAXVER)
137
138 /*
139 * The module declared with DECLARE_MODULE_TIED can only be loaded
140 * into the kernel with exactly the same __FreeBSD_version.
141 *
142 * Use it for modules that use kernel interfaces that are not stable
143 * even on STABLE/X branches.
144 */
145 #define DECLARE_MODULE_TIED(name, data, sub, order) \
146 DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, __FreeBSD_version)
147
148 #define MODULE_VERSION(module, version) \
149 static struct mod_version _##module##_version = { \
150 version \
151 }; \
152 MODULE_METADATA(_##module##_version, MDT_VERSION, \
153 &_##module##_version, #module)
154
155 extern struct sx modules_sx;
156
157 #define MOD_XLOCK sx_xlock(&modules_sx)
158 #define MOD_SLOCK sx_slock(&modules_sx)
159 #define MOD_XUNLOCK sx_xunlock(&modules_sx)
160 #define MOD_SUNLOCK sx_sunlock(&modules_sx)
161 #define MOD_LOCK_ASSERT sx_assert(&modules_sx, SX_LOCKED)
162 #define MOD_XLOCK_ASSERT sx_assert(&modules_sx, SX_XLOCKED)
163
164 struct linker_file;
165
166 void module_register_init(const void *);
167 int module_register(const struct moduledata *, struct linker_file *);
168 module_t module_lookupbyname(const char *);
169 module_t module_lookupbyid(int);
170 int module_quiesce(module_t);
171 void module_reference(module_t);
172 void module_release(module_t);
173 int module_unload(module_t);
174 int module_getid(module_t);
175 module_t module_getfnext(module_t);
176 const char * module_getname(module_t);
177 void module_setspecific(module_t, modspecific_t *);
178 struct linker_file *module_file(module_t);
179
180 #ifdef MOD_DEBUG
181 extern int mod_debug;
182 #define MOD_DEBUG_REFS 1
183
184 #define MOD_DPF(cat, args) do { \
185 if (mod_debug & MOD_DEBUG_##cat) \
186 printf(args); \
187 } while (0)
188
189 #else /* !MOD_DEBUG */
190
191 #define MOD_DPF(cat, args)
192 #endif
193 #endif /* _KERNEL */
194
195 #define MAXMODNAME 32
196
197 struct module_stat {
198 int version; /* set to sizeof(struct module_stat) */
199 char name[MAXMODNAME];
200 int refs;
201 int id;
202 modspecific_t data;
203 };
204
205 #ifndef _KERNEL
206
207 #include <sys/cdefs.h>
208
209 __BEGIN_DECLS
210 int modnext(int _modid);
211 int modfnext(int _modid);
212 int modstat(int _modid, struct module_stat *_stat);
213 int modfind(const char *_name);
214 __END_DECLS
215
216 #endif
217
218 #endif /* !_SYS_MODULE_H_ */
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