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  * 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: releng/11.1/sys/sys/module.h 298023 2016-04-15 02:36:14Z ngie $
   27  */
   28 
   29 #ifndef _SYS_MODULE_H_
   30 #define _SYS_MODULE_H_
   31 
   32 /*
   33  * Module metadata types
   34  */
   35 #define MDT_DEPEND      1               /* argument is a module name */
   36 #define MDT_MODULE      2               /* module declaration */
   37 #define MDT_VERSION     3               /* module version(s) */
   38 #define MDT_PNP_INFO    4               /* Plug and play hints record */
   39 
   40 #define MDT_STRUCT_VERSION      1       /* version of metadata structure */
   41 #define MDT_SETNAME     "modmetadata_set"
   42 
   43 typedef enum modeventtype {
   44         MOD_LOAD,
   45         MOD_UNLOAD,
   46         MOD_SHUTDOWN,
   47         MOD_QUIESCE
   48 } modeventtype_t;
   49 
   50 typedef struct module *module_t;
   51 typedef int (*modeventhand_t)(module_t, int /* modeventtype_t */, void *);
   52 
   53 /*
   54  * Struct for registering modules statically via SYSINIT.
   55  */
   56 typedef struct moduledata {
   57         const char      *name;          /* module name */
   58         modeventhand_t  evhand;         /* event handler */
   59         void            *priv;          /* extra data */
   60 } moduledata_t;
   61 
   62 /*
   63  * A module can use this to report module specific data to the user via
   64  * kldstat(2).
   65  */
   66 typedef union modspecific {
   67         int     intval;
   68         u_int   uintval;
   69         long    longval;
   70         u_long  ulongval;
   71 } modspecific_t;
   72 
   73 /*
   74  * Module dependency declaration
   75  */
   76 struct mod_depend {
   77         int     md_ver_minimum;
   78         int     md_ver_preferred;
   79         int     md_ver_maximum;
   80 };
   81 
   82 /*
   83  * Module version declaration
   84  */
   85 struct mod_version {
   86         int     mv_version;
   87 };
   88 
   89 struct mod_metadata {
   90         int             md_version;     /* structure version MDTV_* */
   91         int             md_type;        /* type of entry MDT_* */
   92         const void      *md_data;       /* specific data */
   93         const char      *md_cval;       /* common string label */
   94 };
   95 
   96 struct mod_pnp_match_info 
   97 {
   98         const char *descr;      /* Description of the table */
   99         const char *bus;        /* Name of the bus for this table */
  100         const void *table;      /* Pointer to pnp table */
  101         int entry_len;          /* Length of each entry in the table (may be */
  102                                 /*   longer than descr describes). */
  103         int num_entry;          /* Number of entries in the table */
  104 };
  105 #ifdef  _KERNEL
  106 
  107 #include <sys/linker_set.h>
  108 
  109 #define MODULE_METADATA(uniquifier, type, data, cval)                   \
  110         static struct mod_metadata _mod_metadata##uniquifier = {        \
  111                 MDT_STRUCT_VERSION,                                     \
  112                 type,                                                   \
  113                 data,                                                   \
  114                 cval                                                    \
  115         };                                                              \
  116         DATA_SET(modmetadata_set, _mod_metadata##uniquifier)
  117 
  118 #define MODULE_DEPEND(module, mdepend, vmin, vpref, vmax)               \
  119         static struct mod_depend _##module##_depend_on_##mdepend        \
  120             __section(".data") = {                                      \
  121                 vmin,                                                   \
  122                 vpref,                                                  \
  123                 vmax                                                    \
  124         };                                                              \
  125         MODULE_METADATA(_md_##module##_on_##mdepend, MDT_DEPEND,        \
  126             &_##module##_depend_on_##mdepend, #mdepend)
  127 
  128 /*
  129  * Every kernel has a 'kernel' module with the version set to
  130  * __FreeBSD_version.  We embed a MODULE_DEPEND() inside every module
  131  * that depends on the 'kernel' module.  It uses the current value of
  132  * __FreeBSD_version as the minimum and preferred versions.  For the
  133  * maximum version it rounds the version up to the end of its branch
  134  * (i.e. M99999 for M.x).  This allows a module built on M.x to work
  135  * on M.y systems where y >= x, but fail on M.z systems where z < x.
  136  */
  137 #define MODULE_KERNEL_MAXVER    (roundup(__FreeBSD_version, 100000) - 1)
  138 
  139 #define DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, maxver)      \
  140         MODULE_DEPEND(name, kernel, __FreeBSD_version,                  \
  141             __FreeBSD_version, maxver);                 \
  142         MODULE_METADATA(_md_##name, MDT_MODULE, &data, #name);          \
  143         SYSINIT(name##module, sub, order, module_register_init, &data); \
  144         struct __hack
  145 
  146 #define DECLARE_MODULE(name, data, sub, order)                          \
  147         DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, MODULE_KERNEL_MAXVER)
  148 
  149 /*
  150  * The module declared with DECLARE_MODULE_TIED can only be loaded
  151  * into the kernel with exactly the same __FreeBSD_version.
  152  *
  153  * Use it for modules that use kernel interfaces that are not stable
  154  * even on STABLE/X branches.
  155  */
  156 #define DECLARE_MODULE_TIED(name, data, sub, order)                             \
  157         DECLARE_MODULE_WITH_MAXVER(name, data, sub, order, __FreeBSD_version)
  158 
  159 #define MODULE_VERSION(module, version)                                 \
  160         static struct mod_version _##module##_version                   \
  161             __section(".data") = {                                      \
  162                 version                                                 \
  163         };                                                              \
  164         MODULE_METADATA(_##module##_version, MDT_VERSION,               \
  165             &_##module##_version, #module)
  166 
  167 /**
  168  * Generic macros to create pnp info hints that modules may export
  169  * to allow external tools to parse their internal device tables
  170  * to make an informed guess about what driver(s) to load.
  171  */
  172 #define MODULE_PNP_INFO(d, b, unique, t, l, n)                          \
  173         static const struct mod_pnp_match_info _module_pnp_##b##_##unique = {   \
  174                 .descr = d,                                             \
  175                 .bus = #b,                                              \
  176                 .table = t,                                             \
  177                 .entry_len = l,                                         \
  178                 .num_entry = n                                          \
  179         };                                                              \
  180         MODULE_METADATA(_md_##b##_pnpinfo_##unique, MDT_PNP_INFO,       \
  181             &_module_pnp_##b##_##unique, #b);
  182 /**
  183  * descr is a string that describes each entry in the table. The general
  184  * form is (TYPE:pnp_name[/pnp_name];)*
  185  * where TYPE is one of the following:
  186  *      U8      uint8_t element
  187  *      V8      like U8 and 0xff means match any
  188  *      G16     uint16_t element, any value >= matches
  189  *      L16     uint16_t element, any value <= matches
  190  *      M16     uint16_t element, mask of which of the following fields to use.
  191  *      U16     uint16_t element
  192  *      V16     like U16 and 0xffff means match any
  193  *      U32     uint32_t element
  194  *      V32     like U32 and 0xffffffff means match any
  195  *      W32     Two 16-bit values with first pnp_name in LSW and second in MSW.
  196  *      Z       pointer to a string to match exactly
  197  *      D       like Z, but is the string passed to device_set_descr()
  198  *      P       A pointer that should be ignored
  199  *      E       EISA PNP Identifier (in binary, but bus publishes string)
  200  *      K       Key for whole table. pnp_name=value. must be last, if present.
  201  *
  202  * The pnp_name "#" is reserved for other fields that should be ignored.
  203  */
  204 
  205 extern struct sx modules_sx;
  206 
  207 #define MOD_XLOCK       sx_xlock(&modules_sx)
  208 #define MOD_SLOCK       sx_slock(&modules_sx)
  209 #define MOD_XUNLOCK     sx_xunlock(&modules_sx)
  210 #define MOD_SUNLOCK     sx_sunlock(&modules_sx)
  211 #define MOD_LOCK_ASSERT sx_assert(&modules_sx, SX_LOCKED)
  212 #define MOD_XLOCK_ASSERT        sx_assert(&modules_sx, SX_XLOCKED)
  213 
  214 struct linker_file;
  215 
  216 void    module_register_init(const void *);
  217 int     module_register(const struct moduledata *, struct linker_file *);
  218 module_t        module_lookupbyname(const char *);
  219 module_t        module_lookupbyid(int);
  220 int     module_quiesce(module_t);
  221 void    module_reference(module_t);
  222 void    module_release(module_t);
  223 int     module_unload(module_t);
  224 int     module_getid(module_t);
  225 module_t        module_getfnext(module_t);
  226 const char *    module_getname(module_t);
  227 void    module_setspecific(module_t, modspecific_t *);
  228 struct linker_file *module_file(module_t);
  229 
  230 #ifdef  MOD_DEBUG
  231 extern int mod_debug;
  232 #define MOD_DEBUG_REFS  1
  233 
  234 #define MOD_DPF(cat, args) do {                                         \
  235         if (mod_debug & MOD_DEBUG_##cat)                                \
  236                 printf(args);                                           \
  237 } while (0)
  238 
  239 #else   /* !MOD_DEBUG */
  240 
  241 #define MOD_DPF(cat, args)
  242 #endif
  243 #endif  /* _KERNEL */
  244 
  245 #define MAXMODNAME      32
  246 
  247 struct module_stat {
  248         int             version;        /* set to sizeof(struct module_stat) */
  249         char            name[MAXMODNAME];
  250         int             refs;
  251         int             id;
  252         modspecific_t   data;
  253 };
  254 
  255 #ifndef _KERNEL
  256 
  257 #include <sys/cdefs.h>
  258 
  259 __BEGIN_DECLS
  260 int     modnext(int _modid);
  261 int     modfnext(int _modid);
  262 int     modstat(int _modid, struct module_stat *_stat);
  263 int     modfind(const char *_name);
  264 __END_DECLS
  265 
  266 #endif
  267 
  268 #endif  /* !_SYS_MODULE_H_ */

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