f7b7769172
non-device code. * Re-implement the method dispatch to improve efficiency. The new system takes about 40ns for a method dispatch on a 300Mhz PII which is only 10ns slower than a direct function call on the same hardware. This changes the new-bus ABI slightly so make sure you re-compile any driver modules which you use.
198 lines
4.2 KiB
C
198 lines
4.2 KiB
C
/*-
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* Copyright (c) 2000 Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/errno.h>
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#ifndef TEST
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#include <sys/systm.h>
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#endif
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#include <sys/kobj.h>
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#ifdef TEST
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#include "usertest.h"
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#endif
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static MALLOC_DEFINE(M_KOBJ, "kobj", "Kernel object structures");
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#ifdef KOBJ_STATS
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#include <sys/sysctl.h>
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int kobj_lookup_hits;
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int kobj_lookup_misses;
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SYSCTL_INT(_kern, OID_AUTO, kobj_hits, CTLFLAG_RD,
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&kobj_lookup_hits, 0, "")
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SYSCTL_INT(_kern, OID_AUTO, kobj_misses, CTLFLAG_RD,
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&kobj_lookup_misses, 0, "")
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#endif
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static int kobj_next_id = 1;
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static int
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kobj_error_method(void)
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{
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return ENXIO;
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}
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static void
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kobj_register_method(struct kobjop_desc *desc)
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{
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if (desc->id == 0)
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desc->id = kobj_next_id++;
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}
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static void
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kobj_unregister_method(struct kobjop_desc *desc)
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{
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}
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void
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kobj_class_compile(kobj_class_t cls)
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{
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kobj_ops_t ops;
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kobj_method_t *m;
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int i;
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/*
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* Don't do anything if we are already compiled.
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*/
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if (cls->ops)
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return;
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/*
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* First register any methods which need it.
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*/
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for (i = 0, m = cls->methods; m->desc; i++, m++)
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kobj_register_method(m->desc);
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/*
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* Then allocate the compiled op table.
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*/
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ops = malloc(sizeof(struct kobj_ops), M_KOBJ, M_NOWAIT);
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if (!ops)
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panic("kobj_compile_methods: out of memory");
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bzero(ops, sizeof(struct kobj_ops));
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ops->cls = cls;
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cls->ops = ops;
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}
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void
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kobj_lookup_method(kobj_method_t *methods,
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kobj_method_t *ce,
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kobjop_desc_t desc)
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{
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ce->desc = desc;
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for (; methods && methods->desc; methods++) {
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if (methods->desc == desc) {
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ce->func = methods->func;
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return;
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}
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}
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if (desc->deflt)
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ce->func = desc->deflt;
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else
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ce->func = kobj_error_method;
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return;
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}
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void
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kobj_class_free(kobj_class_t cls)
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{
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int i;
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kobj_method_t *m;
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/*
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* Unregister any methods which are no longer used.
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*/
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for (i = 0, m = cls->methods; m->desc; i++, m++)
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kobj_unregister_method(m->desc);
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/*
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* Free memory and clean up.
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*/
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free(cls->ops, M_KOBJ);
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cls->ops = 0;
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}
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kobj_t
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kobj_create(kobj_class_t cls,
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struct malloc_type *mtype,
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int mflags)
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{
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kobj_t obj;
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/*
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* Allocate and initialise the new object.
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*/
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obj = malloc(cls->size, mtype, mflags);
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if (!obj)
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return 0;
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bzero(obj, cls->size);
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kobj_init(obj, cls);
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return obj;
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}
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void
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kobj_init(kobj_t obj, kobj_class_t cls)
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{
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/*
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* Consider compiling the class' method table.
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*/
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if (!cls->ops)
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kobj_class_compile(cls);
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obj->ops = cls->ops;
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cls->instances++;
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}
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void
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kobj_delete(kobj_t obj, struct malloc_type *mtype)
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{
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kobj_class_t cls = obj->ops->cls;
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/*
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* Consider freeing the compiled method table for the class
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* after its last instance is deleted. As an optimisation, we
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* should defer this for a short while to avoid thrashing.
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*/
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cls->instances--;
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if (!cls->instances)
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kobj_class_free(cls);
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obj->ops = 0;
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if (mtype)
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free(obj, mtype);
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}
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