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      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 (at) 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