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1/* $NetBSD: module.h,v 1.48 2021/10/24 06:52:26 skrll Exp $ */
2
3/*-
4 * Copyright (c) 2008 The NetBSD Foundation, Inc.
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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef _SYS_MODULE_H_
30#define _SYS_MODULE_H_
31
32#include <sys/types.h>
33#include <sys/param.h>
34#include <sys/cdefs.h>
35#include <sys/uio.h>
36
37#define MAXMODNAME 32
38#define MAXMODDEPS 10
39
40/* Module classes, provided only for system boot and module validation. */
41typedef enum modclass {
42 MODULE_CLASS_ANY,
43 MODULE_CLASS_MISC,
44 MODULE_CLASS_VFS,
45 MODULE_CLASS_DRIVER,
46 MODULE_CLASS_EXEC,
47 MODULE_CLASS_SECMODEL,
48 MODULE_CLASS_BUFQ,
49 MODULE_CLASS_MAX
50} modclass_t;
51
52/* Module sources: where did it come from? */
53typedef enum modsrc {
54 MODULE_SOURCE_KERNEL,
55 MODULE_SOURCE_BOOT,
56 MODULE_SOURCE_FILESYS
57} modsrc_t;
58
59/* Commands passed to module control routine. */
60typedef enum modcmd {
61 MODULE_CMD_INIT, /* mandatory */
62 MODULE_CMD_FINI, /* mandatory */
63 MODULE_CMD_STAT, /* optional */
64 MODULE_CMD_AUTOUNLOAD, /* optional */
65} modcmd_t;
66
67#ifdef _KERNEL
68
69#include <sys/kernel.h>
70#include <sys/mutex.h>
71#include <sys/queue.h>
72#include <sys/specificdata.h>
73
74#include <prop/proplib.h>
75
76/* Module header structure. */
77typedef struct modinfo {
78 u_int mi_version;
79 modclass_t mi_class;
80 int (*mi_modcmd)(modcmd_t, void *);
81 const char *mi_name;
82 const char *mi_required;
83} const modinfo_t;
84
85/* Per module information, maintained by kern_module.c */
86
87struct sysctllog;
88
89typedef struct module {
90 u_int mod_refcnt;
91 int mod_flags;
92#define MODFLG_MUST_FORCE 0x01
93#define MODFLG_AUTO_LOADED 0x02
94 const modinfo_t *mod_info;
95 struct kobj *mod_kobj;
96 TAILQ_ENTRY(module) mod_chain;
97 struct module *(*mod_required)[MAXMODDEPS];
98 u_int mod_nrequired;
99 u_int mod_arequired;
100 modsrc_t mod_source;
101 time_t mod_autotime;
102 specificdata_reference mod_sdref;
103 struct sysctllog *mod_sysctllog;
104} module_t;
105
106/*
107 * Per-module linkage. Loadable modules have a `link_set_modules' section
108 * containing only one entry, pointing to the module's modinfo_t record.
109 * For the kernel, `link_set_modules' can contain multiple entries and
110 * records all modules built into the kernel at link time.
111 *
112 * Alternatively, in some environments rump kernels use
113 * __attribute__((constructor)) due to link sets being
114 * difficult (impossible?) to implement (e.g. GNU gold, OS X, etc.)
115 * If we're cold (read: rump_init() has not been called), we lob the
116 * module onto the list to be handled when rump_init() runs.
117 * nb. it's not possible to use in-kernel locking mechanisms here since
118 * the code runs before rump_init(). We solve the problem by decreeing
119 * that thou shalt not call dlopen()/dlclose() for rump kernel components
120 * from multiple threads before calling rump_init().
121 */
122
123#ifdef RUMP_USE_CTOR
124struct modinfo_chain {
125 const struct modinfo *mc_info;
126 LIST_ENTRY(modinfo_chain) mc_entries;
127};
128LIST_HEAD(modinfo_boot_chain, modinfo_chain);
129#define _MODULE_REGISTER(name) \
130static struct modinfo_chain __CONCAT(mc,name) = { \
131 .mc_info = &__CONCAT(name,_modinfo), \
132}; \
133static void __CONCAT(modctor_,name)(void) __attribute__((__constructor__));\
134static void __CONCAT(modctor_,name)(void) \
135{ \
136 extern struct modinfo_boot_chain modinfo_boot_chain; \
137 if (cold) { \
138 struct modinfo_chain *mc = &__CONCAT(mc,name); \
139 LIST_INSERT_HEAD(&modinfo_boot_chain, mc, mc_entries); \
140 } \
141} \
142 \
143static void __CONCAT(moddtor_,name)(void) __attribute__((__destructor__));\
144static void __CONCAT(moddtor_,name)(void) \
145{ \
146 struct modinfo_chain *mc = &__CONCAT(mc,name); \
147 if (cold) { \
148 LIST_REMOVE(mc, mc_entries); \
149 } \
150}
151
152#else /* RUMP_USE_CTOR */
153
154#define _MODULE_REGISTER(name) __link_set_add_rodata(modules, __CONCAT(name,_modinfo));
155
156#endif /* RUMP_USE_CTOR */
157
158#define MODULE(class, name, required) \
159static int __CONCAT(name,_modcmd)(modcmd_t, void *); \
160static const modinfo_t __CONCAT(name,_modinfo) = { \
161 .mi_version = __NetBSD_Version__, \
162 .mi_class = (class), \
163 .mi_modcmd = __CONCAT(name,_modcmd), \
164 .mi_name = __STRING(name), \
165 .mi_required = (required) \
166}; \
167_MODULE_REGISTER(name)
168
169TAILQ_HEAD(modlist, module);
170
171extern struct vm_map *module_map;
172extern u_int module_count;
173extern u_int module_builtinlist;
174extern struct modlist module_list;
175extern struct modlist module_builtins;
176extern u_int module_gen;
177
178void module_init(void);
179void module_start_unload_thread(void);
180void module_builtin_require_force(void);
181void module_init_md(void);
182void module_init_class(modclass_t);
183int module_prime(const char *, void *, size_t);
184
185module_t *module_kernel(void);
186const char *module_name(struct module *);
187modsrc_t module_source(struct module *);
188bool module_compatible(int, int);
189int module_load(const char *, int, prop_dictionary_t, modclass_t);
190int module_builtin_add(modinfo_t * const *, size_t, bool);
191int module_builtin_remove(modinfo_t *, bool);
192int module_autoload(const char *, modclass_t);
193int module_unload(const char *);
194void module_hold(module_t *);
195void module_rele(module_t *);
196int module_find_section(const char *, void **, size_t *);
197void module_thread_kick(void);
198void module_load_vfs_init(void);
199
200specificdata_key_t module_specific_key_create(specificdata_key_t *, specificdata_dtor_t);
201void module_specific_key_delete(specificdata_key_t);
202void *module_getspecific(module_t *, specificdata_key_t);
203void module_setspecific(module_t *, specificdata_key_t, void *);
204void *module_register_callbacks(void (*)(struct module *),
205 void (*)(struct module *));
206void module_unregister_callbacks(void *);
207
208void module_whatis(uintptr_t, void (*)(const char *, ...)
209 __printflike(1, 2));
210void module_print_list(void (*)(const char *, ...) __printflike(1, 2));
211
212#ifdef _MODULE_INTERNAL
213extern
214int (*module_load_vfs_vec)(const char *, int, bool, module_t *,
215 prop_dictionary_t *);
216int module_load_vfs(const char *, int, bool, module_t *,
217 prop_dictionary_t *);
218void module_error(const char *, ...) __printflike(1, 2);
219void module_print(const char *, ...) __printflike(1, 2);
220#endif /* _MODULE_INTERNAL */
221
222#define MODULE_BASE_SIZE 64
223extern char module_base[MODULE_BASE_SIZE];
224extern const char *module_machine;
225
226struct netbsd32_modctl_args;
227extern int compat32_80_modctl_compat_stub(struct lwp *,
228 const struct netbsd32_modctl_args *, register_t *);
229
230#else /* _KERNEL */
231
232#include <stdint.h>
233
234#endif /* _KERNEL */
235
236typedef struct modctl_load {
237 const char *ml_filename;
238
239#define MODCTL_NO_PROP 0x2
240#define MODCTL_LOAD_FORCE 0x1
241 int ml_flags;
242
243 const char *ml_props;
244 size_t ml_propslen;
245} modctl_load_t;
246
247enum modctl {
248 MODCTL_LOAD, /* modctl_load_t *ml */
249 MODCTL_UNLOAD, /* char *name */
250 MODCTL_OSTAT, /* struct iovec *buffer */
251 MODCTL_EXISTS, /* enum: 0: load, 1: autoload */
252 MODCTL_STAT /* struct iovec *buffer */
253};
254
255/*
256 * This structure is used with the newer version of MODCTL_STAT, which
257 * exports strings of arbitrary length for the list of required modules.
258 */
259typedef struct modstat {
260 char ms_name[MAXMODNAME];
261 uint64_t ms_addr;
262 modsrc_t ms_source;
263 modclass_t ms_class;
264 u_int ms_size;
265 u_int ms_refcnt;
266 u_int ms_flags;
267 u_int ms_reqoffset; /* offset to module's required list
268 from beginning of iovec buffer! */
269} modstat_t;
270
271int modctl(int, void *);
272
273#ifdef _KERNEL
274/* attention: pointers passed are userland pointers!,
275 see modctl_load_t */
276int handle_modctl_load(const char *, int, const char *, size_t);
277#endif
278
279#endif /* !_SYS_MODULE_H_ */