/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef _SYS_VIO_COMMON_H
#define	_SYS_VIO_COMMON_H

#ifdef __cplusplus
extern "C" {
#endif

#include <sys/ldc.h>

/*
 * Common header for VIO descriptor ring entries
 */
typedef struct vio_dring_entry_hdr {
	uint8_t		dstate;		/* Current state of Dring entry */
	uint8_t		ack:1;		/* 1 => receiver must ACK when DONE */

	/*
	 * Padding.
	 */
	uint16_t	resv[3];
} vio_dring_entry_hdr_t;

/*
 * Common macros for acquiring and releasing VIO descriptor ring entries
 */
#define	VIO_DRING_ACQUIRE(otd, mtype, handle, start, stop)		\
	((mtype) == LDC_DIRECT_MAP ?					\
	LDC_ON_TRAP((otd)) :						\
	ldc_mem_dring_acquire((handle), (start), (stop)))

#define	VIO_DRING_ACQUIRE_NOCOPYIN(otd, mtype)				\
	((mtype) == LDC_DIRECT_MAP ?					\
	LDC_ON_TRAP((otd)) : 0)

#define	VIO_DRING_RELEASE(mtype, handle, start, stop)			\
	((mtype) == LDC_DIRECT_MAP ?					\
	LDC_NO_TRAP() :							\
	ldc_mem_dring_release((handle), (start), (stop)))

#define	VIO_DRING_RELEASE_NOCOPYOUT(mtype)				\
	((mtype) == LDC_DIRECT_MAP ?					\
	LDC_NO_TRAP() : 0)

#ifdef __cplusplus
}
#endif

#endif	/* _SYS_VIO_COMMON_H */