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Commit	Line	Data
	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: src/sys/i386/isa/ccbque.h,v 1.3.6.2 2000/10/21 07:44:24 nyan Exp $
	31	* $DragonFly: src/sys/sys/ccbque.h,v 1.4 2003/08/26 21:42:19 rob Exp $
	32	*/
	33	/*
	34	* Common command control queue funcs.
	35	* Written by N. Honda.
	36	*/
	37
	38	#ifndef _CCBQUE_H_
	39	#define _CCBQUE_H_
	40
	41	#define CCB_MWANTED 0x01
	42
	43	/* (I) structure and prototype */
	44	#define GENERIC_CCB_ASSERT(DEV, CCBTYPE) \
	45	TAILQ_HEAD(CCBTYPE##tab, CCBTYPE); \
	46	struct CCBTYPE##que { \
	47	struct CCBTYPE##tab CCBTYPE##tab; \
	48	int count; \
	49	int maxccb; \
	50	u_int flags; \
	51	}; \
	52	\
	53	void DEV##_init_ccbque (int); \
	54	struct CCBTYPE *DEV##_get_ccb (void); \
	55	void DEV##_free_ccb (struct CCBTYPE *);
	56
	57	/* (II) static allocated memory */
	58	#define GENERIC_CCB_STATIC_ALLOC(DEV, CCBTYPE) \
	59	static struct CCBTYPE##que CCBTYPE##que;
	60
	61	/* (III) functions */
	62	#define GENERIC_CCB(DEV, CCBTYPE, CHAIN) \
	63	\
	64	void \
	65	DEV##_init_ccbque(count) \
	66	int count; \
	67	{ \
	68	if (CCBTYPE##que.maxccb == 0) \
	69	TAILQ_INIT(&CCBTYPE##que.CCBTYPE##tab); \
	70	CCBTYPE##que.maxccb += count; \
	71	} \
	72	\
	73	struct CCBTYPE * \
	74	DEV##_get_ccb() \
	75	{ \
	76	struct CCBTYPE *cb; \
	77	int s = splcam(); \
	78	\
	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, M_NOWAIT); \
	91	if (cb != NULL) \
	92	{ \
	93	bzero(cb, sizeof(*cb)); \
	94	goto out; \
	95	} \
	96	} \
	97	CCBTYPE##que.count --; \
	98	} \
	99	\
	100	cb = NULL; \
	101	\
	102	out: \
	103	splx(s); \
	104	return cb; \
	105	} \
	106	\
	107	void \
	108	DEV##_free_ccb(cb) \
	109	struct CCBTYPE *cb; \
	110	{ \
	111	int s = splcam(); \
	112	\
	113	TAILQ_INSERT_TAIL(&CCBTYPE##que.CCBTYPE##tab, cb, CHAIN); \
	114	CCBTYPE##que.count --; \
	115	\
	116	if (CCBTYPE##que.flags & CCB_MWANTED) \
	117	{ \
	118	CCBTYPE##que.flags &= ~CCB_MWANTED; \
	119	wakeup ((caddr_t) &CCBTYPE##que.count); \
	120	} \
	121	splx(s); \
	122	}
	123	#endif /* !_CCBQUE_H_ */