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/* $NetBSD$ */
/*
* [NetBSD for NEC PC98 series]
* Copyright (c) 1994, 1995, 1996 NetBSD/pc98 porting staff.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Common command control queue funcs.
* Written by N. Honda.
*/
#ifndef _CCBQUE_H_
#define _CCBQUE_H_
#define CCB_MWANTED 0x01
#define CCB_WOK(fl) (((fl) == 0) ? M_WAITOK : M_NOWAIT)
/* (I) structure and prototype */
#define GENERIC_CCB_ASSERT(DEV, CCBTYPE) \
TAILQ_HEAD(CCBTYPE##tab, CCBTYPE); \
struct CCBTYPE##que { \
struct CCBTYPE##tab CCBTYPE##tab; \
int count; \
int maxccb; \
u_int flags; \
}; \
\
void DEV##_init_ccbque __P((int)); \
struct CCBTYPE *DEV##_get_ccb __P((int)); \
void DEV##_free_ccb __P((register struct CCBTYPE *));
/* (II) static allocated memory */
#define GENERIC_CCB_STATIC_ALLOC(DEV, CCBTYPE) \
static struct CCBTYPE##que CCBTYPE##que;
/* (III) functions */
#define GENERIC_CCB(DEV, CCBTYPE, CHAIN) \
\
void \
DEV##_init_ccbque(count) \
int count; \
{ \
if (CCBTYPE##que.maxccb == 0) \
TAILQ_INIT(&CCBTYPE##que.CCBTYPE##tab) \
CCBTYPE##que.maxccb += count; \
} \
\
struct CCBTYPE * \
DEV##_get_ccb(flags) \
int flags; \
{ \
register struct CCBTYPE *cb; \
int s = splbio(); \
\
again: \
if (CCBTYPE##que.count < CCBTYPE##que.maxccb) \
{ \
CCBTYPE##que.count ++; \
cb = CCBTYPE##que.CCBTYPE##tab.tqh_first; \
if (cb != NULL) \
{ \
TAILQ_REMOVE(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN)\
goto out; \
} \
else \
{ \
cb = malloc(sizeof(*cb), M_DEVBUF, CCB_WOK(flags));\
if (cb != NULL) \
{ \
bzero(cb, sizeof(*cb)); \
goto out; \
} \
} \
CCBTYPE##que.count --; \
} \
\
if (flags == 0) \
{ \
CCBTYPE##que.flags |= CCB_MWANTED; \
tsleep((caddr_t) &CCBTYPE##que.count, PRIBIO, "ccbwait", 0);\
goto again; \
} \
cb = NULL; \
\
out: \
splx(s); \
return cb; \
} \
\
void \
DEV##_free_ccb(cb) \
register struct CCBTYPE *cb; \
{ \
int s = splbio(); \
\
TAILQ_INSERT_TAIL(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN) \
CCBTYPE##que.count --; \
\
if (CCBTYPE##que.flags & CCB_MWANTED) \
{ \
CCBTYPE##que.flags &= ~CCB_MWANTED; \
wakeup ((caddr_t) &CCBTYPE##que.count); \
} \
splx(s); \
}
#endif /* !_CCBQUE_H_ */
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