The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/_bus_dma.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright 2006 John-Mark Gurney.
    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  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: stable/12/sys/sys/_bus_dma.h 326256 2017-11-27 15:01:59Z pfg $
   29  *
   30  */
   31 
   32 #ifndef _SYS__BUS_DMA_H_
   33 #define _SYS__BUS_DMA_H_
   34 
   35 typedef int bus_dmasync_op_t;
   36 
   37 /*
   38  *      bus_dma_tag_t
   39  *
   40  *      A machine-dependent opaque type describing the characteristics
   41  *      of how to perform DMA mappings.  This structure encapsultes
   42  *      information concerning address and alignment restrictions, number
   43  *      of S/G segments, amount of data per S/G segment, etc.
   44  */
   45 typedef struct bus_dma_tag      *bus_dma_tag_t;
   46 
   47 /*
   48  *      bus_dmamap_t
   49  *
   50  *      DMA mapping instance information.
   51  */
   52 typedef struct bus_dmamap       *bus_dmamap_t;
   53 
   54 /*
   55  * A function that performs driver-specific synchronization on behalf of
   56  * busdma.
   57  */
   58 typedef enum {
   59         BUS_DMA_LOCK    = 0x01,
   60         BUS_DMA_UNLOCK  = 0x02,
   61 } bus_dma_lock_op_t;
   62 
   63 typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
   64 
   65 #endif /* !_SYS__BUS_DMA_H_ */

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