The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/sys/kobj.h

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    1 /*-
    2  * Copyright (c) 2000,2003 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/7.3/sys/sys/kobj.h 190279 2009-03-22 20:52:43Z marius $
   27  */
   28 
   29 #ifndef _SYS_KOBJ_H_
   30 #define _SYS_KOBJ_H_
   31 
   32 /*
   33  * Forward declarations
   34  */
   35 typedef struct kobj             *kobj_t;
   36 typedef struct kobj_class       *kobj_class_t;
   37 typedef struct kobj_method      kobj_method_t;
   38 typedef int                     (*kobjop_t)(void);
   39 typedef struct kobj_ops         *kobj_ops_t;
   40 typedef struct kobjop_desc      *kobjop_desc_t;
   41 struct malloc_type;
   42 
   43 struct kobj_method {
   44         kobjop_desc_t   desc;
   45         kobjop_t        func;
   46 };
   47 
   48 /*
   49  * A class is simply a method table and a sizeof value. When the first
   50  * instance of the class is created, the method table will be compiled 
   51  * into a form more suited to efficient method dispatch. This compiled 
   52  * method table is always the first field of the object.
   53  */
   54 #define KOBJ_CLASS_FIELDS                                               \
   55         const char      *name;          /* class name */                \
   56         kobj_method_t   *methods;       /* method table */              \
   57         size_t          size;           /* object size */               \
   58         kobj_class_t    *baseclasses;   /* base classes */              \
   59         u_int           refs;           /* reference count */           \
   60         kobj_ops_t      ops             /* compiled method table */
   61 
   62 struct kobj_class {
   63         KOBJ_CLASS_FIELDS;
   64 };
   65 
   66 /*
   67  * Implementation of kobj.
   68  */
   69 #define KOBJ_FIELDS                             \
   70         kobj_ops_t      ops
   71 
   72 struct kobj {
   73         KOBJ_FIELDS;
   74 };
   75 
   76 /*
   77  * The ops table is used as a cache of results from kobj_lookup_method().
   78  */
   79 
   80 #define KOBJ_CACHE_SIZE 256
   81 
   82 struct kobj_ops {
   83         kobj_method_t   *cache[KOBJ_CACHE_SIZE];
   84         kobj_class_t    cls;
   85 };
   86 
   87 struct kobjop_desc {
   88         unsigned int    id;             /* unique ID */
   89         kobj_method_t   *deflt;         /* default implementation */
   90 };
   91 
   92 /*
   93  * Shorthand for constructing method tables.
   94  */
   95 #if 1
   96 #define KOBJMETHOD(NAME, FUNC) { &NAME##_desc, (kobjop_t) FUNC }
   97 #else /* notyet */
   98 #define KOBJMETHOD(NAME, FUNC) \
   99 { &NAME##_desc, (kobjop_t) (FUNC != (NAME##_t *)NULL ? FUNC : NULL) }
  100 #endif
  101 
  102 /*
  103  *
  104  */
  105 #define KOBJMETHOD_END  { NULL, NULL }
  106 
  107 /*
  108  * Declare a class (which should be defined in another file.
  109  */
  110 #define DECLARE_CLASS(name) extern struct kobj_class name
  111 
  112 /*
  113  * Define a class with no base classes (api backward-compatible. with
  114  * FreeBSD-5.1 and earlier).
  115  */
  116 #define DEFINE_CLASS(name, methods, size)               \
  117 DEFINE_CLASS_0(name, name ## _class, methods, size)
  118 
  119 /*
  120  * Define a class with no base classes. Use like this:
  121  *
  122  * DEFINE_CLASS_0(foo, foo_class, foo_methods, sizeof(foo_softc));
  123  */
  124 #define DEFINE_CLASS_0(name, classvar, methods, size)   \
  125                                                         \
  126 struct kobj_class classvar = {                          \
  127         #name, methods, size, NULL                      \
  128 }
  129 
  130 /*
  131  * Define a class inheriting a single base class. Use like this:
  132  *
  133  * DEFINE_CLASS_1(foo, foo_class, foo_methods, sizeof(foo_softc),
  134  *                        bar);
  135  */
  136 #define DEFINE_CLASS_1(name, classvar, methods, size,   \
  137                        base1)                           \
  138                                                         \
  139 static kobj_class_t name ## _baseclasses[] =            \
  140         { &base1, NULL };                               \
  141 struct kobj_class classvar = {                          \
  142         #name, methods, size, name ## _baseclasses      \
  143 }
  144 
  145 /*
  146  * Define a class inheriting two base classes. Use like this:
  147  *
  148  * DEFINE_CLASS_2(foo, foo_class, foo_methods, sizeof(foo_softc),
  149  *                        bar, baz);
  150  */
  151 #define DEFINE_CLASS_2(name, methods, size,             \
  152                        base1, base2)                    \
  153                                                         \
  154 static kobj_class_t name ## _baseclasses[] =            \
  155         { &base1,                                       \
  156           &base2, NULL };                               \
  157 struct kobj_class name ## _class = {                    \
  158         #name, methods, size, name ## _baseclasses      \
  159 }
  160 
  161 /*
  162  * Define a class inheriting three base classes. Use like this:
  163  *
  164  * DEFINE_CLASS_3(foo, foo_class, foo_methods, sizeof(foo_softc),
  165  *                        bar, baz, foobar);
  166  */
  167 #define DEFINE_CLASS_3(name, methods, size,             \
  168                        base1, base2, base3)             \
  169                                                         \
  170 static kobj_class_t name ## _baseclasses[] =            \
  171         { &base1,                                       \
  172           &base2,                                       \
  173           &base3, NULL };                               \
  174 struct kobj_class name ## _class = {                    \
  175         #name, methods, size, name ## _baseclasses      \
  176 }
  177 
  178 
  179 /*
  180  * Compile the method table in a class.
  181  */
  182 void            kobj_class_compile(kobj_class_t cls);
  183 
  184 /*
  185  * Compile the method table, with the caller providing the space for
  186  * the ops table.(for use before malloc is initialised).
  187  */
  188 void            kobj_class_compile_static(kobj_class_t cls, kobj_ops_t ops);
  189 
  190 /*
  191  * Free the compiled method table in a class.
  192  */
  193 void            kobj_class_free(kobj_class_t cls);
  194 
  195 /*
  196  * Allocate memory for and initialise a new object.
  197  */
  198 kobj_t          kobj_create(kobj_class_t cls,
  199                             struct malloc_type *mtype,
  200                             int mflags);
  201 
  202 /*
  203  * Initialise a pre-allocated object.
  204  */
  205 void            kobj_init(kobj_t obj, kobj_class_t cls);
  206 
  207 /*
  208  * Delete an object. If mtype is non-zero, free the memory.
  209  */
  210 void            kobj_delete(kobj_t obj, struct malloc_type *mtype);
  211 
  212 /*
  213  * Maintain stats on hits/misses in lookup caches.
  214  */
  215 #ifdef KOBJ_STATS
  216 extern u_int kobj_lookup_hits;
  217 extern u_int kobj_lookup_misses;
  218 #endif
  219 
  220 /*
  221  * Lookup the method in the cache and if it isn't there look it up the
  222  * slow way.
  223  */
  224 #ifdef KOBJ_STATS
  225 #define KOBJOPLOOKUP(OPS,OP) do {                               \
  226         kobjop_desc_t _desc = &OP##_##desc;                     \
  227         kobj_method_t **_cep =                                  \
  228             &OPS->cache[_desc->id & (KOBJ_CACHE_SIZE-1)];       \
  229         kobj_method_t *_ce = *_cep;                             \
  230         kobj_lookup_hits++; /* assume hit */                    \
  231         if (_ce->desc != _desc)                                 \
  232                 _ce = kobj_lookup_method(OPS->cls,              \
  233                                          _cep, _desc);          \
  234         _m = _ce->func;                                         \
  235 } while(0)
  236 #else
  237 #define KOBJOPLOOKUP(OPS,OP) do {                               \
  238         kobjop_desc_t _desc = &OP##_##desc;                     \
  239         kobj_method_t **_cep =                                  \
  240             &OPS->cache[_desc->id & (KOBJ_CACHE_SIZE-1)];       \
  241         kobj_method_t *_ce = *_cep;                             \
  242         if (_ce->desc != _desc)                                 \
  243                 _ce = kobj_lookup_method(OPS->cls,              \
  244                                          _cep, _desc);          \
  245         _m = _ce->func;                                         \
  246 } while(0)
  247 #endif
  248 
  249 kobj_method_t* kobj_lookup_method(kobj_class_t cls,
  250                                   kobj_method_t **cep,
  251                                   kobjop_desc_t desc);
  252 
  253 
  254 /*
  255  * Default method implementation. Returns ENXIO.
  256  */
  257 int kobj_error_method(void);
  258 
  259 /*
  260  * Machine-dependent initialisation call for boot-time kobj clients
  261  */
  262 void kobj_machdep_init(void);
  263 
  264 #endif /* !_SYS_KOBJ_H_ */

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