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: src/sys/sys/module.h,v 1.14.2.3 2002/03/17 11:07:45 alfred Exp $
  27  * $DragonFly: src/sys/sys/module.h,v 1.11 2006/12/23 00:27:03 swildner Exp $
  28  */
  29
  30 #ifndef _SYS_MODULE_H_
  31 #define _SYS_MODULE_H_
  32
  33 #ifndef _SYS_TYPES_H_
  34 #include <sys/types.h>
  35 #endif
  36 #include <sys/linker_set.h>
  37
  38 /*
  39  * Module metadata types
  40  */
  41 #define MDT_DEPEND              1       /* argument is a module name */
  42 #define MDT_MODULE              2       /* module declaration */
  43 #define MDT_VERSION             3       /* module version(s) */
  44
  45 #define MDT_STRUCT_VERSION      1       /* version of metadata structure */
  46 #define MDT_SETNAME             "modmetadata_set"
  47
  48 typedef enum modeventtype {
  49     MOD_LOAD,
  50     MOD_UNLOAD,
  51     MOD_SHUTDOWN
  52 } modeventtype_t;
  53
  54 typedef struct module *module_t;
  55
  56 typedef int (*modeventhand_t)(module_t, int /*modeventtype_t*/, void *);
  57
  58 /*
  59  * Struct for registering modules statically via SYSINIT.
  60  */
  61 typedef struct moduledata {
  62         const char      *name;  /* module name */
  63         modeventhand_t  evhand; /* event handler */
  64         void            *priv;  /* extra data */
  65 } moduledata_t;
  66
  67 /*
  68  * A module can use this to report module specific data to
  69  * the user via kldstat(2).
  70  */
  71 typedef union modspecific {
  72     int         intval;
  73     u_int       uintval;
  74     long        longval;
  75     u_long      ulongval;
  76 } modspecific_t;
  77
  78 /*
  79  * Module dependency declaration
  80  */
  81 struct mod_depend {
  82         int     md_ver_minimum;
  83         int     md_ver_preferred;
  84         int     md_ver_maximum;
  85 };
  86
  87 /*
  88  * Module version declaration
  89  */
  90 struct mod_version {
  91         int     mv_version;
  92 };
  93
  94 struct mod_metadata {
  95         int             md_version;     /* structure version MDTV_* */
  96         int             md_type;        /* type of entry MDT_* */
  97         void            *md_data;       /* specific data */
  98         const char      *md_cval;       /* common string label */
  99 };
 100
 101 #ifdef _KERNEL
 102
 103 #define MODULE_METADATA(uniquifier, type, data, cval)                   \
 104         static struct mod_metadata _mod_metadata##uniquifier = {        \
 105                 MDT_STRUCT_VERSION,                                     \
 106                 type,                                                   \
 107                 data,                                                   \
 108                 cval                                                    \
 109         };                                                              \
 110         DATA_SET(modmetadata_set, _mod_metadata##uniquifier)
 111
 112 #define MODULE_DEPEND(module, mdepend, vmin, vpref, vmax)               \
 113         static struct mod_depend _##module##_depend_on_##mdepend = {    \
 114                 vmin,                                                   \
 115                 vpref,                                                  \
 116                 vmax                                                    \
 117         };                                                              \
 118         MODULE_METADATA(_md_##module##_on_##mdepend, MDT_DEPEND,        \
 119             &_##module##_depend_on_##mdepend, #mdepend)
 120
 121 #define DECLARE_MODULE(name, data, sub, order)                          \
 122     MODULE_METADATA(_md_##name, MDT_MODULE, &data, #name);              \
 123     SYSINIT(name##module, sub, order, module_register_init, &data)      \
 124     struct __hack
 125
 126 #define MODULE_VERSION(module, version)                                 \
 127         static struct mod_version _##module##_version = {               \
 128                 version                                                 \
 129         };                                                              \
 130         MODULE_METADATA(_##module##_version, MDT_VERSION,               \
 131             &_##module##_version, #module)
 132
 133 /*
 134  * This is used to declare a module name that is the same as the KLD
 135  * name so the kernel can avoid double-loading modules.  It is typically
 136  * necessary when a module is made up of several bus drivers each with
 137  * its own separate sysinit.
 138  */
 139 #if 0
 140 #define DECLARE_DUMMY_MODULE(name)                                      \
 141     MODULE_METADATA(_md_##name, MDT_MODULE, NULL, #name)
 142 #else
 143 #define DECLARE_DUMMY_MODULE(name)      struct __hack
 144 #endif
 145
 146 void module_register_init(const void *data);
 147 struct linker_file;
 148 int module_register(const struct moduledata *data, struct linker_file *lf);
 149 module_t module_lookupbyname(const char *name);
 150 module_t module_lookupbyid(int modid);
 151 void module_reference(module_t mod);
 152 int module_release(module_t mod);
 153 int module_unload(module_t mod);
 154 int module_getid(module_t mod);
 155 module_t module_getfnext(module_t mod);
 156 void module_setspecific(module_t mod, modspecific_t *datap);
 157
 158 #ifdef MOD_DEBUG
 159
 160 extern int mod_debug;
 161 #define MOD_DEBUG_REFS  1
 162
 163 #define MOD_DPF(cat, args)                                      \
 164         do {                                                    \
 165                 if (mod_debug & MOD_DEBUG_##cat) kprintf args;  \
 166         } while (0)
 167
 168 #else
 169
 170 #define MOD_DPF(cat, args)
 171
 172 #endif
 173
 174 #endif /* _KERNEL */
 175
 176 #define MAXMODNAME      32
 177
 178 struct module_stat {
 179     int         version;        /* set to sizeof(struct module_stat) */
 180     char        name[MAXMODNAME];
 181     int         refs;
 182     int         id;
 183     modspecific_t data;
 184 };
 185
 186 #ifndef _KERNEL
 187
 188 #include <sys/cdefs.h>
 189
 190 __BEGIN_DECLS
 191 int     modnext(int);
 192 int     modfnext(int);
 193 int     modstat(int, struct module_stat *);
 194 int     modfind(const char *);
 195 __END_DECLS
 196
 197 #endif
 198
 199 #endif  /* !_SYS_MODULE_H_ */