| | 1 | /* $FreeBSD: src/sys/i386/include/physio_proc.h,v 1.1.2.1 2000/10/29 11:05:48 non Exp $ */ |
| | 2 | /* $DragonFly: src/sys/i386/include/Attic/physio_proc.h,v 1.4 2003/08/26 21:42:18 rob Exp $ */ |
| | 3 | /* $NecBSD: physio_proc.h,v 3.4 1999/07/23 20:47:03 honda Exp $ */ |
| | 4 | /* $NetBSD$ */ |
| | 5 | |
| | 6 | /* |
| | 7 | * [NetBSD for NEC PC-98 series] |
| | 8 | * Copyright (c) 1998 |
| | 9 | * NetBSD/pc98 porting staff. All rights reserved. |
| | 10 | * |
| | 11 | * Redistribution and use in source and binary forms, with or without |
| | 12 | * modification, are permitted provided that the following conditions |
| | 13 | * are met: |
| | 14 | * 1. Redistributions of source code must retain the above copyright |
| | 15 | * notice, this list of conditions and the following disclaimer. |
| | 16 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 17 | * notice, this list of conditions and the following disclaimer in the |
| | 18 | * documentation and/or other materials provided with the distribution. |
| | 19 | * 3. The name of the author may not be used to endorse or promote products |
| | 20 | * derived from this software without specific prior written permission. |
| | 21 | * |
| | 22 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| | 23 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| | 24 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| | 25 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, |
| | 26 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| | 27 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| | 28 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| | 29 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| | 30 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
| | 31 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| | 32 | * POSSIBILITY OF SUCH DAMAGE. |
| | 33 | */ |
| | 34 | #ifndef _MACHINE_PHYSIO_PROC_H_ |
| | 35 | #define _MACHINE_PHYSIO_PROC_H_ |
| | 36 | |
| | 37 | #include <sys/buf.h> |
| | 38 | #include <sys/queue.h> |
| | 39 | |
| | 40 | struct physio_proc; |
| | 41 | TAILQ_HEAD(physio_proc_head, physio_proc); |
| | 42 | struct physio_proc_head physio_proc_freet, physio_proc_busyt; |
| | 43 | |
| | 44 | struct physio_proc { |
| | 45 | TAILQ_ENTRY(physio_proc) pp_chain; |
| | 46 | struct proc *pp_proc; |
| | 47 | }; |
| | 48 | |
| | 49 | static __inline struct physio_proc *physio_proc_enter (struct buf *); |
| | 50 | static __inline void physio_proc_leave (struct physio_proc *); |
| | 51 | |
| | 52 | static __inline struct physio_proc * |
| | 53 | physio_proc_enter(bp) |
| | 54 | struct buf *bp; |
| | 55 | { |
| | 56 | struct physio_proc *pp; |
| | 57 | int s; |
| | 58 | |
| | 59 | if (bp == NULL || (bp->b_flags & B_PHYS) == 0) |
| | 60 | return NULL; |
| | 61 | if ((pp = physio_proc_freet.tqh_first) == NULL) |
| | 62 | return NULL; |
| | 63 | |
| | 64 | s = splstatclock(); |
| | 65 | TAILQ_REMOVE(&physio_proc_freet, pp, pp_chain); |
| | 66 | #if !defined(__FreeBSD__) || __FreeBSD_version < 400001 |
| | 67 | pp->pp_proc = bp->b_proc; |
| | 68 | #endif |
| | 69 | TAILQ_INSERT_TAIL(&physio_proc_busyt, pp, pp_chain); |
| | 70 | splx(s); |
| | 71 | return pp; |
| | 72 | } |
| | 73 | |
| | 74 | static __inline void |
| | 75 | physio_proc_leave(pp) |
| | 76 | struct physio_proc *pp; |
| | 77 | { |
| | 78 | int s; |
| | 79 | |
| | 80 | if (pp == NULL) |
| | 81 | return; |
| | 82 | |
| | 83 | s = splstatclock(); |
| | 84 | TAILQ_REMOVE(&physio_proc_busyt, pp, pp_chain); |
| | 85 | TAILQ_INSERT_TAIL(&physio_proc_freet, pp, pp_chain); |
| | 86 | pp->pp_proc = NULL; |
| | 87 | splx(s); |
| | 88 | } |
| | 89 | |
| | 90 | void physio_proc_init (void); |
| | 91 | #endif /* _MACHINE_PHYSIO_PROC_H_ */ |
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