FreeBSD/Linux Kernel Cross Reference
sys/sys/module.h
1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1997 Doug Rabson
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 * $FreeBSD: releng/12.0/sys/sys/module.h 338948 2018-09-26 17:12:14Z imp $
29 */
30
31 #ifndef _SYS_MODULE_H_
32 #define _SYS_MODULE_H_
33
34 /*
35 * Module metadata types
36 */
37 #define MDT_DEPEND 1 /* argument is a module name */
38 #define MDT_MODULE 2 /* module declaration */
39 #define MDT_VERSION 3 /* module version(s) */
40 #define MDT_PNP_INFO 4 /* Plug and play hints record */
41
42 #define MDT_STRUCT_VERSION 1 /* version of metadata structure */
43 #define MDT_SETNAME "modmetadata_set"
44
45 typedef enum modeventtype {
46 MOD_LOAD,
47 MOD_UNLOAD,
48 MOD_SHUTDOWN,
49 MOD_QUIESCE
50 } modeventtype_t;
51
52 typedef struct module *module_t;
53 typedef int (*modeventhand_t)(module_t, int /* modeventtype_t */, void *);
54
55 /*
56 * Struct for registering modules statically via SYSINIT.
57 */
58 typedef struct moduledata {
59 const char *name; /* module name */
60 modeventhand_t evhand; /* event handler */
61 void *priv; /* extra data */
62 } moduledata_t;
63
64 /*
65 * A module can use this to report module specific data to the user via
66 * kldstat(2).
67 */
68 typedef union modspecific {
69 int intval;
70 u_int uintval;
71 long longval;
72 u_long ulongval;
73 } modspecific_t;
74
75 /*
76 * Module dependency declaration
77 */
78 struct mod_depend {
79 int md_ver_minimum;
80 int md_ver_preferred;
81 int md_ver_maximum;
82 };
83
84 /*
85 * Module version declaration
86 */
87 struct mod_version {
88 int mv_version;
89 };
90
91 struct mod_metadata {
92 int md_version; /* structure version MDTV_* */
93 int md_type; /* type of entry MDT_* */
94 const void *md_data; /* specific data */
95 const char *md_cval; /* common string label */
96 };
97
98 struct mod_pnp_match_info
99 {
100 const char *descr; /* Description of the table */
101 const char *bus; /* Name of the bus for this table */
102 const void *table; /* Pointer to pnp table */
103 int entry_len; /* Length of each entry in the table (may be */
104 /* longer than descr describes). */
105 int num_entry; /* Number of entries in the table */
106 };
107 #ifdef _KERNEL
108
109 #include <sys/linker_set.h>
110
111 #define MODULE_METADATA_CONCAT(uniquifier) _mod_metadata##uniquifier
112 #define MODULE_METADATA(uniquifier, type, data, cval) \
113 static struct mod_metadata MODULE_METADATA_CONCAT(uniquifier) = { \
114 MDT_STRUCT_VERSION, \
115 type, \
116 data, \
117 cval \
118 }; \
119 DATA_SET(modmetadata_set, MODULE_METADATA_CONCAT(uniquifier))
120
121 #define MODULE_DEPEND(module, mdepend, vmin, vpref, vmax) \
122 static struct mod_depend _##module##_depend_on_##mdepend \
123 __section(".data") = { \
124 vmin, \
125 vpref, \
126 vmax \
127 }; \
128 MODULE_METADATA(_md_##module##_on_##mdepend, MDT_DEPEND, \
129 &_##module##_depend_on_##mdepend, #mdepend)
130
131 /*
132 * Every kernel has a 'kernel' module with the version set to
133 * __FreeBSD_version. We embed a MODULE_DEPEND() inside every module
134 * that depends on the 'kernel' module. It uses the current value of
135 * __FreeBSD_version as the minimum and preferred versions. For the
136 * maximum version it rounds the version up to the end of its branch
137 * (i.e. M99999 for M.x). This allows a module built on M.x to work
138 * on M.y systems where y >= x, but fail on M.z systems where z < x.
139 */
140 #define MODULE_KERNEL_MAXVER (roundup(__FreeBSD_version, 100000) - 1)
141
142 #define DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, maxver) \
143 MODULE_DEPEND(name, kernel, __FreeBSD_version, \
144 __FreeBSD_version, maxver); \
145 MODULE_METADATA(_md_##name, MDT_MODULE, &data, __XSTRING(name));\
146 SYSINIT(name##module, sub, order, module_register_init, &data); \
147 struct __hack
148
149 #ifdef KLD_TIED
150 #define DECLARE_MODULE(name, data, sub, order) \
151 DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, __FreeBSD_version)
152 #else
153 #define DECLARE_MODULE(name, data, sub, order) \
154 DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, MODULE_KERNEL_MAXVER)
155 #endif
156
157 /*
158 * The module declared with DECLARE_MODULE_TIED can only be loaded
159 * into the kernel with exactly the same __FreeBSD_version.
160 *
161 * Use it for modules that use kernel interfaces that are not stable
162 * even on STABLE/X branches.
163 */
164 #define DECLARE_MODULE_TIED(name, data, sub, order) \
165 DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, __FreeBSD_version)
166
167 #define MODULE_VERSION_CONCAT(module, version) _##module##_version
168 #define MODULE_VERSION(module, version) \
169 static struct mod_version MODULE_VERSION_CONCAT(module, version)\
170 __section(".data") = { \
171 version \
172 }; \
173 MODULE_METADATA(MODULE_VERSION_CONCAT(module, version), MDT_VERSION,\
174 &MODULE_VERSION_CONCAT(module, version), __XSTRING(module))
175
176 /**
177 * Generic macros to create pnp info hints that modules may export
178 * to allow external tools to parse their internal device tables
179 * to make an informed guess about what driver(s) to load.
180 */
181 #define MODULE_PNP_INFO(d, b, unique, t, n) \
182 static const struct mod_pnp_match_info _module_pnp_##b##_##unique = { \
183 .descr = d, \
184 .bus = #b, \
185 .table = t, \
186 .entry_len = sizeof((t)[0]), \
187 .num_entry = n \
188 }; \
189 MODULE_METADATA(_md_##b##_pnpinfo_##unique, MDT_PNP_INFO, \
190 &_module_pnp_##b##_##unique, #b);
191 /**
192 * descr is a string that describes each entry in the table. The general
193 * form is the grammar (TYPE:pnp_name[/pnp_name];)*
194 * where TYPE is one of the following:
195 * U8 uint8_t element
196 * V8 like U8 and 0xff means match any
197 * G16 uint16_t element, any value >= matches
198 * L16 uint16_t element, any value <= matches
199 * M16 uint16_t element, mask of which of the following fields to use.
200 * U16 uint16_t element
201 * V16 like U16 and 0xffff means match any
202 * U32 uint32_t element
203 * V32 like U32 and 0xffffffff means match any
204 * W32 Two 16-bit values with first pnp_name in LSW and second in MSW.
205 * Z pointer to a string to match exactly
206 * D pointer to a string to human readable description for device
207 * P A pointer that should be ignored
208 * E EISA PNP Identifier (in binary, but bus publishes string)
209 * T Key for whole table. pnp_name=value. must be last, if present.
210 *
211 * The pnp_name "#" is reserved for other fields that should be ignored.
212 * Otherwise pnp_name must match the name from the parent device's pnpinfo
213 * output. The second pnp_name is used for the W32 type.
214 */
215
216 extern struct sx modules_sx;
217
218 #define MOD_XLOCK sx_xlock(&modules_sx)
219 #define MOD_SLOCK sx_slock(&modules_sx)
220 #define MOD_XUNLOCK sx_xunlock(&modules_sx)
221 #define MOD_SUNLOCK sx_sunlock(&modules_sx)
222 #define MOD_LOCK_ASSERT sx_assert(&modules_sx, SX_LOCKED)
223 #define MOD_XLOCK_ASSERT sx_assert(&modules_sx, SX_XLOCKED)
224
225 struct linker_file;
226
227 void module_register_init(const void *);
228 int module_register(const struct moduledata *, struct linker_file *);
229 module_t module_lookupbyname(const char *);
230 module_t module_lookupbyid(int);
231 int module_quiesce(module_t);
232 void module_reference(module_t);
233 void module_release(module_t);
234 int module_unload(module_t);
235 int module_getid(module_t);
236 module_t module_getfnext(module_t);
237 const char * module_getname(module_t);
238 void module_setspecific(module_t, modspecific_t *);
239 struct linker_file *module_file(module_t);
240
241 #ifdef MOD_DEBUG
242 extern int mod_debug;
243 #define MOD_DEBUG_REFS 1
244
245 #define MOD_DPF(cat, args) do { \
246 if (mod_debug & MOD_DEBUG_##cat) \
247 printf args; \
248 } while (0)
249
250 #else /* !MOD_DEBUG */
251
252 #define MOD_DPF(cat, args)
253 #endif
254 #endif /* _KERNEL */
255
256 #define MAXMODNAME 32
257
258 struct module_stat {
259 int version; /* set to sizeof(struct module_stat) */
260 char name[MAXMODNAME];
261 int refs;
262 int id;
263 modspecific_t data;
264 };
265
266 #ifndef _KERNEL
267
268 #include <sys/cdefs.h>
269
270 __BEGIN_DECLS
271 int modnext(int _modid);
272 int modfnext(int _modid);
273 int modstat(int _modid, struct module_stat *_stat);
274 int modfind(const char *_name);
275 __END_DECLS
276
277 #endif
278
279 #endif /* !_SYS_MODULE_H_ */
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