Initial import from FreeBSD RELENG_4:
[dragonfly.git] / sys / platform / pc32 / include / physio_proc.h
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1/* $FreeBSD: src/sys/i386/include/physio_proc.h,v 1.1.2.1 2000/10/29 11:05:48 non Exp $ */
2/* $NecBSD: physio_proc.h,v 3.4 1999/07/23 20:47:03 honda Exp $ */
3/* $NetBSD$ */
4
5/*
6 * [NetBSD for NEC PC-98 series]
7 * Copyright (c) 1998
8 * NetBSD/pc98 porting staff. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
27 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
29 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
30 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33#ifndef _I386_PHYSIO_PROC_H_
34#define _I386_PHYSIO_PROC_H_
35#include <sys/buf.h>
36#include <sys/queue.h>
37
38struct physio_proc;
39TAILQ_HEAD(physio_proc_head, physio_proc);
40struct physio_proc_head physio_proc_freet, physio_proc_busyt;
41
42struct physio_proc {
43 TAILQ_ENTRY(physio_proc) pp_chain;
44 struct proc *pp_proc;
45};
46
47static __inline struct physio_proc *physio_proc_enter __P((struct buf *));
48static __inline void physio_proc_leave __P((struct physio_proc *));
49
50static __inline struct physio_proc *
51physio_proc_enter(bp)
52 struct buf *bp;
53{
54 struct physio_proc *pp;
55 int s;
56
57 if (bp == NULL || (bp->b_flags & B_PHYS) == 0)
58 return NULL;
59 if ((pp = physio_proc_freet.tqh_first) == NULL)
60 return NULL;
61
62 s = splstatclock();
63 TAILQ_REMOVE(&physio_proc_freet, pp, pp_chain);
64#if !defined(__FreeBSD__) || __FreeBSD_version < 400001
65 pp->pp_proc = bp->b_proc;
66#endif
67 TAILQ_INSERT_TAIL(&physio_proc_busyt, pp, pp_chain);
68 splx(s);
69 return pp;
70}
71
72static __inline void
73physio_proc_leave(pp)
74 struct physio_proc *pp;
75{
76 int s;
77
78 if (pp == NULL)
79 return;
80
81 s = splstatclock();
82 TAILQ_REMOVE(&physio_proc_busyt, pp, pp_chain);
83 TAILQ_INSERT_TAIL(&physio_proc_freet, pp, pp_chain);
84 pp->pp_proc = NULL;
85 splx(s);
86}
87
88void physio_proc_init __P((void));
89#endif /* _I386_PHYSIO_PROC_H_ */