kernel - Optimize the x86-64 lwbuf API
[dragonfly.git] / sys / cpu / x86_64 / include / lwbuf.h
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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#ifndef _CPU_LWBUF_H_
37#define _CPU_LWBUF_H_
38
39#ifndef _SYS_TYPES_H_
40#include <sys/types.h>
41#endif
42#ifndef _SYS_GLOBALDATA_H_
43#include <sys/globaldata.h>
44#endif
45#ifndef _VM_PMAP_H_
46#include <vm/pmap.h>
47#endif
46751036
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48#ifndef _VM_VM_PAGE_H_
49#include <vm/vm_page.h>
50#endif
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51#ifndef _MACHINE_ATOMIC_H_
52#include <machine/atomic.h>
53#endif
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54#ifndef _MACHINE_VMPARAM_H_
55#include <machine/vmparam.h>
56#endif
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57
58#if !defined(_KERNEL) && !defined(_KERNEL_STRUCTURES)
59#error "This file should not be included by userland programs."
60#endif
61
62struct lwbuf {
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63 vm_page_t m; /* currently mapped page */
64 vm_offset_t kva; /* va of mapping */
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65};
66
67static __inline vm_page_t
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68lwbuf_page(struct lwbuf *lwb)
69{
70 return (lwb->m);
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71}
72
73static __inline vm_offset_t
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74lwbuf_kva(struct lwbuf *lwb)
75{
76 return (lwb->kva);
77}
78
79static __inline struct lwbuf *
80lwbuf_alloc(vm_page_t m, struct lwbuf *lwb_cache)
81{
82 struct lwbuf *lwb = lwb_cache;
83
84 lwb->m = m;
85 lwb->kva = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(lwb->m));
86
87 return (lwb);
88}
89
90static __inline void
91lwbuf_free(struct lwbuf *lwb)
92{
93 lwb->m = NULL; /* safety */
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94}
95
96#define lwbuf_set_global(lwb)
97
98#if defined(_KERNEL)
99
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100#endif
101
102#endif /* !_CPU_LWBUF_H_ */