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