The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/ccbque.h

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    1 /*      $NetBSD$        */
    2 /*
    3  * [NetBSD for NEC PC98 series]
    4  *  Copyright (c) 1994, 1995, 1996 NetBSD/pc98 porting staff.
    5  *  All rights reserved.
    6  * 
    7  *  Redistribution and use in source and binary forms, with or without
    8  *  modification, are permitted provided that the following conditions
    9  *  are met:
   10  *  1. Redistributions of source code must retain the above copyright
   11  *     notice, this list of conditions and the following disclaimer.
   12  *  2. Redistributions in binary form must reproduce the above copyright
   13  *     notice, this list of conditions and the following disclaimer in the
   14  *     documentation and/or other materials provided with the distribution.
   15  *  3. The name of the author may not be used to endorse or promote products
   16  *     derived from this software without specific prior written permission.
   17  * 
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   21  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
   22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   28  * POSSIBILITY OF SUCH DAMAGE.
   29  *
   30  * $FreeBSD: releng/5.2/sys/i386/isa/ccbque.h 92765 2002-03-20 07:51:46Z alfred $
   31  */
   32 /*
   33  * Common command control queue funcs.
   34  * Written by N. Honda.
   35  */
   36 
   37 #ifndef _CCBQUE_H_
   38 #define _CCBQUE_H_
   39 
   40 #define CCB_MWANTED 0x01
   41                                                 
   42 /* (I)  structure and prototype */
   43 #define GENERIC_CCB_ASSERT(DEV, CCBTYPE)                                \
   44 TAILQ_HEAD(CCBTYPE##tab, CCBTYPE);                                      \
   45 struct CCBTYPE##que {                                                   \
   46         struct CCBTYPE##tab CCBTYPE##tab;                               \
   47         int count;                                                      \
   48         int maxccb;                                                     \
   49         u_int flags;                                                    \
   50 };                                                                      \
   51                                                                         \
   52 void DEV##_init_ccbque(int);                                    \
   53 struct CCBTYPE *DEV##_get_ccb(void);                            \
   54 void DEV##_free_ccb(register struct CCBTYPE *);
   55 
   56 /* (II)  static allocated memory */
   57 #define GENERIC_CCB_STATIC_ALLOC(DEV, CCBTYPE)                          \
   58 static struct CCBTYPE##que CCBTYPE##que;
   59 
   60 /* (III)  functions */
   61 #define GENERIC_CCB(DEV, CCBTYPE, CHAIN)                                \
   62                                                                         \
   63 void                                                                    \
   64 DEV##_init_ccbque(count)                                                \
   65         int count;                                                      \
   66 {                                                                       \
   67         if (CCBTYPE##que.maxccb == 0)                                   \
   68                 TAILQ_INIT(&CCBTYPE##que.CCBTYPE##tab);                 \
   69         CCBTYPE##que.maxccb += count;                                   \
   70 }                                                                       \
   71                                                                         \
   72 struct CCBTYPE *                                                        \
   73 DEV##_get_ccb()                                                         \
   74 {                                                                       \
   75         register struct CCBTYPE *cb;                                    \
   76         int s = splcam();                                               \
   77                                                                         \
   78         if (CCBTYPE##que.count < CCBTYPE##que.maxccb)                   \
   79         {                                                               \
   80                 CCBTYPE##que.count ++;                                  \
   81                 cb = TAILQ_FIRST(&(CCBTYPE##que.CCBTYPE##tab));         \
   82                 if (cb != NULL)                                         \
   83                 {                                                       \
   84                         TAILQ_REMOVE(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN);\
   85                         goto out;                                       \
   86                 }                                                       \
   87                 else                                                    \
   88                 {                                                       \
   89                         cb = malloc(sizeof(*cb), M_DEVBUF, M_NOWAIT);   \
   90                         if (cb != NULL)                                 \
   91                         {                                               \
   92                                 bzero(cb, sizeof(*cb));                 \
   93                                 goto out;                               \
   94                         }                                               \
   95                 }                                                       \
   96                 CCBTYPE##que.count --;                                  \
   97         }                                                               \
   98                                                                         \
   99         cb = NULL;                                                      \
  100                                                                         \
  101 out:                                                                    \
  102         splx(s);                                                        \
  103         return cb;                                                      \
  104 }                                                                       \
  105                                                                         \
  106 void                                                                    \
  107 DEV##_free_ccb(cb)                                                      \
  108         register struct CCBTYPE *cb;                                    \
  109 {                                                                       \
  110         int s = splcam();                                               \
  111                                                                         \
  112         TAILQ_INSERT_TAIL(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN);       \
  113         CCBTYPE##que.count --;                                          \
  114                                                                         \
  115         if (CCBTYPE##que.flags & CCB_MWANTED)                           \
  116         {                                                               \
  117                 CCBTYPE##que.flags &= ~CCB_MWANTED;                     \
  118                 wakeup ((caddr_t) &CCBTYPE##que.count);                 \
  119         }                                                               \
  120         splx(s);                                                        \
  121 }
  122 #endif  /* !_CCBQUE_H_ */

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