2 * Copyright (c) 2000 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
26 * $FreeBSD: src/sys/kern/subr_kobj.c,v 1.4.2.1 2001/02/02 19:49:13 cg Exp $
29 #include <sys/param.h>
30 #include <sys/queue.h>
31 #include <sys/malloc.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/errno.h>
35 #include <sys/thread.h>
36 #include <sys/thread2.h>
38 #include <sys/systm.h>
46 static MALLOC_DEFINE(M_KOBJ, "kobj", "Kernel object structures");
48 static struct lwkt_token kobj_token;
49 static int kobj_next_id = 1;
52 kobj_init_token(void *arg)
54 lwkt_token_init(&kobj_token, "kobj");
57 SYSINIT(kobj, SI_BOOT1_LOCK, SI_ORDER_ANY, kobj_init_token, NULL);
60 * This method structure is used to initialise new caches. Since the
61 * desc pointer is NULL, it is guaranteed never to match any real
64 static const struct kobj_method null_method = {
69 kobj_error_method(void)
75 kobj_register_method(struct kobjop_desc *desc)
78 desc->id = kobj_next_id++;
82 kobj_unregister_method(struct kobjop_desc *desc)
87 kobj_class_compile(kobj_class_t cls)
94 * Don't do anything if we are already compiled.
100 * Allocate space for the compiled ops table.
102 ops = kmalloc(sizeof(struct kobj_ops), M_KOBJ, M_INTWAIT);
103 for (i = 0; i < KOBJ_CACHE_SIZE; i++)
104 ops->cache[i] = &null_method;
107 * In case of preemption, another thread might have been faster,
108 * but that's fine for us.
118 * Afterwards register any methods which need it.
120 for (m = cls->methods; m->desc; m++)
121 kobj_register_method(m->desc);
124 static kobj_method_t *
125 kobj_lookup_method_class(kobj_class_t cls, kobjop_desc_t desc)
127 kobj_method_t *methods = cls->methods;
130 for (ce = methods; ce && ce->desc; ce++)
131 if (ce->desc == desc)
137 static kobj_method_t *
138 kobj_lookup_method_mi(kobj_class_t cls, kobjop_desc_t desc)
143 ce = kobj_lookup_method_class(cls, desc);
147 basep = cls->baseclasses;
149 for (; *basep; basep++) {
150 ce = kobj_lookup_method_mi(*basep, desc);
160 kobj_lookup_method(kobj_class_t cls,
166 ce = kobj_lookup_method_mi(cls, desc);
174 * This is called from the KOBJOPLOOKUP() macro in sys/kobj.h and
175 * replaces the original large body of the macro with a single
179 kobj_lookup_method_cache(kobj_class_t cls, kobj_method_t **cep,
184 cep = &cep[desc->id & (KOBJ_CACHE_SIZE-1)];
186 if (ce->desc != desc)
187 ce = kobj_lookup_method(cls, cep, desc);
192 kobj_class_free(kobj_class_t cls)
198 * Unregister any methods which are no longer used.
200 for (i = 0, m = cls->methods; m->desc; i++, m++)
201 kobj_unregister_method(m->desc);
204 * Free memory and clean up.
206 kfree(cls->ops, M_KOBJ);
211 kobj_class_instantiate(kobj_class_t cls)
213 lwkt_gettoken(&kobj_token);
217 kobj_class_compile(cls);
221 lwkt_reltoken(&kobj_token);
225 kobj_class_uninstantiate(kobj_class_t cls)
227 lwkt_gettoken(&kobj_token);
232 kobj_class_free(cls);
235 lwkt_reltoken(&kobj_token);
239 kobj_create(kobj_class_t cls,
240 struct malloc_type *mtype,
246 * Allocate and initialise the new object.
248 obj = kmalloc(cls->size, mtype, mflags | M_ZERO);
257 kobj_init(kobj_t obj, kobj_class_t cls)
259 kobj_class_instantiate(cls);
264 kobj_delete(kobj_t obj, struct malloc_type *mtype)
266 kobj_class_t cls = obj->ops->cls;
268 kobj_class_uninstantiate(cls);