1/* $NetBSD: dtv_scatter.h,v 1.1 2011/07/09 14:46:56 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2011 Jared D. McNeill <jmcneill@invisible.ca>
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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Jared D. McNeill.
18 * 4. Neither the name of The NetBSD Foundation nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
23 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
24 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
26 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
32 * POSSIBILITY OF SUCH DAMAGE.
33 */
34
35#ifndef _DEV_DTV_DTV_SCATTER_H
36#define _DEV_DTV_DTV_SCATTER_H
37
38#include <sys/pool.h>
39
40struct dtv_scatter_buf {
41 pool_cache_t sb_pool;
42 size_t sb_size; /* size in bytes */
43 size_t sb_npages; /* number of pages */
44 uint8_t **sb_page_ary; /* array of page pointers */
45};
46
47struct dtv_scatter_io {
48 struct dtv_scatter_buf *sio_buf;
49 off_t sio_offset;
50 size_t sio_resid;
51};
52
53void dtv_scatter_buf_init(struct dtv_scatter_buf *);
54void dtv_scatter_buf_destroy(struct dtv_scatter_buf *);
55int dtv_scatter_buf_set_size(struct dtv_scatter_buf *, size_t);
56paddr_t dtv_scatter_buf_map(struct dtv_scatter_buf *, off_t);
57
58bool dtv_scatter_io_init(struct dtv_scatter_buf *, off_t, size_t,
59 struct dtv_scatter_io *);
60bool dtv_scatter_io_next(struct dtv_scatter_io *, void **, size_t *);
61void dtv_scatter_io_undo(struct dtv_scatter_io *, size_t);
62void dtv_scatter_io_copyin(struct dtv_scatter_io *, const void *);
63/* void dtv_scatter_io_copyout(struct dtv_scatter_io *, void *); */
64int dtv_scatter_io_uiomove(struct dtv_scatter_io *, struct uio *);
65
66#endif /* !_DEV_DTV_DTV_SCATTER_H */
67