The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/module.h

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    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: stable/12/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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