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 /*
   31  * Common command control queue funcs.
   32  * Written by N. Honda.
   33  */
   34 
   35 #ifndef _CCBQUE_H_
   36 #define _CCBQUE_H_
   37 
   38 #define CCB_MWANTED 0x01
   39 #define CCB_WOK(fl) (((fl) == 0) ? M_WAITOK : M_NOWAIT)
   40                                                 
   41 /* (I)  structure and prototype */
   42 #define GENERIC_CCB_ASSERT(DEV, CCBTYPE)                                \
   43 TAILQ_HEAD(CCBTYPE##tab, CCBTYPE);                                      \
   44 struct CCBTYPE##que {                                                   \
   45         struct CCBTYPE##tab CCBTYPE##tab;                               \
   46         int count;                                                      \
   47         int maxccb;                                                     \
   48         u_int flags;                                                    \
   49 };                                                                      \
   50                                                                         \
   51 void DEV##_init_ccbque __P((int));                                      \
   52 struct CCBTYPE *DEV##_get_ccb __P((int));                               \
   53 void DEV##_free_ccb __P((register struct CCBTYPE *));
   54 
   55 /* (II)  static allocated memory */
   56 #define GENERIC_CCB_STATIC_ALLOC(DEV, CCBTYPE)                          \
   57 static struct CCBTYPE##que CCBTYPE##que;
   58 
   59 /* (III)  functions */
   60 #define GENERIC_CCB(DEV, CCBTYPE, CHAIN)                                \
   61                                                                         \
   62 void                                                                    \
   63 DEV##_init_ccbque(count)                                                \
   64         int count;                                                      \
   65 {                                                                       \
   66         if (CCBTYPE##que.maxccb == 0)                                   \
   67                 TAILQ_INIT(&CCBTYPE##que.CCBTYPE##tab);                 \
   68         CCBTYPE##que.maxccb += count;                                   \
   69 }                                                                       \
   70                                                                         \
   71 struct CCBTYPE *                                                        \
   72 DEV##_get_ccb(flags)                                                    \
   73         int flags;                                                      \
   74 {                                                                       \
   75         register struct CCBTYPE *cb;                                    \
   76         int s = splbio();                                               \
   77                                                                         \
   78 again:                                                                  \
   79         if (CCBTYPE##que.count < CCBTYPE##que.maxccb)                   \
   80         {                                                               \
   81                 CCBTYPE##que.count ++;                                  \
   82                 cb = CCBTYPE##que.CCBTYPE##tab.tqh_first;               \
   83                 if (cb != NULL)                                         \
   84                 {                                                       \
   85                         TAILQ_REMOVE(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN);\
   86                         goto out;                                       \
   87                 }                                                       \
   88                 else                                                    \
   89                 {                                                       \
   90                         cb = malloc(sizeof(*cb), M_DEVBUF, CCB_WOK(flags));\
   91                         if (cb != NULL)                                 \
   92                         {                                               \
   93                                 bzero(cb, sizeof(*cb));                 \
   94                                 goto out;                               \
   95                         }                                               \
   96                 }                                                       \
   97                 CCBTYPE##que.count --;                                  \
   98         }                                                               \
   99                                                                         \
  100         if (flags == 0)                                                 \
  101         {                                                               \
  102                 CCBTYPE##que.flags |= CCB_MWANTED;                      \
  103                 tsleep((caddr_t) &CCBTYPE##que.count, PRIBIO, "ccbwait", 0);\
  104                 goto again;                                             \
  105         }                                                               \
  106         cb = NULL;                                                      \
  107                                                                         \
  108 out:                                                                    \
  109         splx(s);                                                        \
  110         return cb;                                                      \
  111 }                                                                       \
  112                                                                         \
  113 void                                                                    \
  114 DEV##_free_ccb(cb)                                                      \
  115         register struct CCBTYPE *cb;                                    \
  116 {                                                                       \
  117         int s = splbio();                                               \
  118                                                                         \
  119         TAILQ_INSERT_TAIL(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN);       \
  120         CCBTYPE##que.count --;                                          \
  121                                                                         \
  122         if (CCBTYPE##que.flags & CCB_MWANTED)                           \
  123         {                                                               \
  124                 CCBTYPE##que.flags &= ~CCB_MWANTED;                     \
  125                 wakeup ((caddr_t) &CCBTYPE##que.count);                 \
  126         }                                                               \
  127         splx(s);                                                        \
  128 }
  129 #endif  /* !_CCBQUE_H_ */

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