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