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