/* $NetBSD: dtv_scatter.h,v 1.1 2011/07/09 14:46:56 jmcneill Exp $ */
/*-
* Copyright (c) 2011 Jared D. McNeill <
[email protected]>
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Jared D. McNeill.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``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 FOUNDATION OR CONTRIBUTORS
* 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.
*/
#ifndef _DEV_DTV_DTV_SCATTER_H
#define _DEV_DTV_DTV_SCATTER_H
#include <sys/pool.h>
struct dtv_scatter_buf {
pool_cache_t sb_pool;
size_t sb_size; /* size in bytes */
size_t sb_npages; /* number of pages */
uint8_t **sb_page_ary; /* array of page pointers */
};
struct dtv_scatter_io {
struct dtv_scatter_buf *sio_buf;
off_t sio_offset;
size_t sio_resid;
};
void dtv_scatter_buf_init(struct dtv_scatter_buf *);
void dtv_scatter_buf_destroy(struct dtv_scatter_buf *);
int dtv_scatter_buf_set_size(struct dtv_scatter_buf *, size_t);
paddr_t dtv_scatter_buf_map(struct dtv_scatter_buf *, off_t);
bool dtv_scatter_io_init(struct dtv_scatter_buf *, off_t, size_t,
struct dtv_scatter_io *);
bool dtv_scatter_io_next(struct dtv_scatter_io *, void **, size_t *);
void dtv_scatter_io_undo(struct dtv_scatter_io *, size_t);
void dtv_scatter_io_copyin(struct dtv_scatter_io *, const void *);
/* void dtv_scatter_io_copyout(struct dtv_scatter_io *, void *); */
int dtv_scatter_io_uiomove(struct dtv_scatter_io *, struct uio *);
#endif /* !_DEV_DTV_DTV_SCATTER_H */
