usr/src/boot/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  * $FreeBSD$
  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 intenral 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_ */