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 $
27 * $DragonFly: src/sys/kern/subr_kobj.c,v 1.7 2004/04/14 18:28:29 joerg Exp $
30 #include <sys/param.h>
31 #include <sys/queue.h>
32 #include <sys/malloc.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/errno.h>
36 #include <sys/thread.h>
37 #include <sys/thread2.h>
39 #include <sys/systm.h>
47 static MALLOC_DEFINE(M_KOBJ, "kobj", "Kernel object structures");
51 #include <sys/sysctl.h>
53 u_int kobj_lookup_hits;
54 u_int kobj_lookup_misses;
56 SYSCTL_UINT(_kern, OID_AUTO, kobj_hits, CTLFLAG_RD,
57 &kobj_lookup_hits, 0, "")
58 SYSCTL_UINT(_kern, OID_AUTO, kobj_misses, CTLFLAG_RD,
59 &kobj_lookup_misses, 0, "")
63 static struct lwkt_token kobj_token;
64 static int kobj_next_id = 1;
67 kobj_init_token(void *arg)
69 lwkt_token_init(&kobj_token);
72 SYSINIT(kobj, SI_SUB_LOCK, SI_ORDER_ANY, kobj_init_token, NULL);
75 * This method structure is used to initialise new caches. Since the
76 * desc pointer is NULL, it is guaranteed never to match any real
79 static struct kobj_method null_method = {
84 kobj_error_method(void)
90 kobj_register_method(struct kobjop_desc *desc)
93 desc->id = kobj_next_id++;
97 kobj_unregister_method(struct kobjop_desc *desc)
102 kobj_class_compile(kobj_class_t cls)
109 * Don't do anything if we are already compiled.
115 * Allocate space for the compiled ops table.
117 ops = malloc(sizeof(struct kobj_ops), M_KOBJ, M_INTWAIT);
118 for (i = 0; i < KOBJ_CACHE_SIZE; i++)
119 ops->cache[i] = &null_method;
122 * In case of preemption, another thread might have been faster,
123 * but that's fine for us.
131 panic("kobj_compile_methods: out of memory");
137 * Afterwards register any methods which need it.
139 for (m = cls->methods; m->desc; m++)
140 kobj_register_method(m->desc);
143 static kobj_method_t *
144 kobj_lookup_method_class(kobj_class_t cls, kobjop_desc_t desc)
146 kobj_method_t *methods = cls->methods;
149 for (ce = methods; ce && ce->desc; ce++)
150 if (ce->desc == desc)
156 static kobj_method_t *
157 kobj_lookup_method_mi(kobj_class_t cls, kobjop_desc_t desc)
162 ce = kobj_lookup_method_class(cls, desc);
166 basep = cls->baseclasses;
168 for (; *basep; basep++) {
169 ce = kobj_lookup_method_mi(*basep, desc);
179 kobj_lookup_method(kobj_class_t cls,
187 * Correct for the 'hit' assumption in KOBJOPLOOKUP and record
191 kobj_lookup_misses--;
194 ce = kobj_lookup_method_mi(cls, desc);
202 kobj_class_free(kobj_class_t cls)
208 * Unregister any methods which are no longer used.
210 for (i = 0, m = cls->methods; m->desc; i++, m++)
211 kobj_unregister_method(m->desc);
214 * Free memory and clean up.
216 free(cls->ops, M_KOBJ);
221 kobj_class_instantiate(kobj_class_t cls)
225 lwkt_gettoken(&ilock, &kobj_token);
229 kobj_class_compile(cls);
233 lwkt_reltoken(&ilock);
237 kobj_class_uninstantiate(kobj_class_t cls)
241 lwkt_gettoken(&ilock, &kobj_token);
246 kobj_class_free(cls);
249 lwkt_reltoken(&ilock);
253 kobj_create(kobj_class_t cls,
254 struct malloc_type *mtype,
260 * Allocate and initialise the new object.
262 obj = malloc(cls->size, mtype, mflags | M_ZERO);
271 kobj_init(kobj_t obj, kobj_class_t cls)
273 kobj_class_instantiate(cls);
278 kobj_delete(kobj_t obj, struct malloc_type *mtype)
280 kobj_class_t cls = obj->ops->cls;
282 kobj_class_uninstantiate(cls);