| 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 | |
| 40 | struct 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 | |
| 47 | struct dtv_scatter_io { |
| 48 | struct dtv_scatter_buf *sio_buf; |
| 49 | off_t sio_offset; |
| 50 | size_t sio_resid; |
| 51 | }; |
| 52 | |
| 53 | void dtv_scatter_buf_init(struct dtv_scatter_buf *); |
| 54 | void dtv_scatter_buf_destroy(struct dtv_scatter_buf *); |
| 55 | int dtv_scatter_buf_set_size(struct dtv_scatter_buf *, size_t); |
| 56 | paddr_t dtv_scatter_buf_map(struct dtv_scatter_buf *, off_t); |
| 57 | |
| 58 | bool dtv_scatter_io_init(struct dtv_scatter_buf *, off_t, size_t, |
| 59 | struct dtv_scatter_io *); |
| 60 | bool dtv_scatter_io_next(struct dtv_scatter_io *, void **, size_t *); |
| 61 | void dtv_scatter_io_undo(struct dtv_scatter_io *, size_t); |
| 62 | void dtv_scatter_io_copyin(struct dtv_scatter_io *, const void *); |
| 63 | /* void dtv_scatter_io_copyout(struct dtv_scatter_io *, void *); */ |
| 64 | int dtv_scatter_io_uiomove(struct dtv_scatter_io *, struct uio *); |
| 65 | |
| 66 | #endif /* !_DEV_DTV_DTV_SCATTER_H */ |
| 67 | |