kernel - Optimize the x86-64 lwbuf API
[dragonfly.git] / sys / cpu / x86_64 / misc / lwbuf.c
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1/*
2 * Copyright (c) 2010 by The DragonFly Project and Samuel J. Greear.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The DragonFly Project
6 * by Samuel J. Greear <sjg@thesjg.com>
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 * 3. Neither the name of The DragonFly Project nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific, prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
27 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
28 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
30 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
31 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
32 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/types.h>
37#include <sys/kernel.h>
38#include <sys/objcache.h>
39#include <sys/systm.h>
40#include <vm/vm.h>
41#include <vm/pmap.h>
42#include <vm/vm_extern.h>
43#include <vm/vm_kern.h>
44#include <vm/vm_page.h>
45#include <cpu/lwbuf.h>
46#include <machine/param.h>
47
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48#if 0
49/*
50 * NO LONGER USED - See inlines
51 */
52
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53static void lwbuf_init(void *);
54SYSINIT(sock_lwb, SI_BOOT2_MACHDEP, SI_ORDER_ANY, lwbuf_init, NULL);
55
56static struct objcache *lwbuf_cache;
57
58MALLOC_DEFINE(M_LWBUF, "lwbuf", "Lightweight buffers");
59struct objcache_malloc_args lwbuf_malloc_args = { sizeof(struct lwbuf), M_LWBUF };
60
61
62static boolean_t
63lwbuf_cache_ctor(void *obj, void *pdata, int ocflags)
64{
65 struct lwbuf *lwb = (struct lwbuf *)obj;
66
67 lwb->m = NULL;
68 lwb->kva = 0;
69
70 return (TRUE);
71}
72
73static void
74lwbuf_init(void *arg)
75{
76 lwbuf_cache = objcache_create("lwbuf", 0, 0,
77 lwbuf_cache_ctor, NULL, NULL,
78 objcache_malloc_alloc, objcache_malloc_free,
79 &lwbuf_malloc_args);
80}
81
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82#endif
83
84#if 0
85/*
86 * NO LONGER USED - See inlines
87 */
88
5c5185ae 89struct lwbuf *
7a683a24 90lwbuf_alloc(vm_page_t m, struct lwbuf *lwb_cache)
5c5185ae 91{
7a683a24 92 struct lwbuf *lwb = lwb_cache;
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93
94 lwb->m = m;
95 lwb->kva = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(lwb->m));
96
97 return (lwb);
98}
99
100void
101lwbuf_free(struct lwbuf *lwb)
102{
7a683a24 103 lwb->m = NULL; /* safety */
5c5185ae 104}
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105
106#endif